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[PATCH v4 03/10] PCI: Allow per function PCI slots

by Farhan Ali

On s390 systems, which use a machine level hypervisor, PCI devices are always accessed through a form of PCI pass-through which fundamentally operates on a per PCI function granularity. This is also reflected in the s390 PCI hotplug driver which creates hotplug slots for individual PCI functions. Its reset_slot() function, which is a wrapper for zpci_hot_reset_device(), thus also resets individual functions. Currently, the kernel's PCI_SLOT() macro assigns the same pci_slot object to multifunction devices. This approach worked fine on s390 systems that only exposed virtual functions as individual PCI domains to the operating system. Since commit 44510d6fa0c0 ("s390/pci: Handling multifunctions") s390 supports exposing the topology of multifunction PCI devices by grouping them in a shared PCI domain. When attempting to reset a function through the hotplug driver, the shared slot assignment causes the wrong function to be reset instead of the intended one. It also leaks memory as we do create a pci_slot object for the function, but don't correctly free it in pci_slot_release(). Add a flag for struct pci_slot to allow per function PCI slots for functions managed through a hypervisor, which exposes individual PCI functions while retaining the topology. Fixes: 44510d6fa0c0 ("s390/pci: Handling multifunctions") Cc: <stable(a)vger.kernel.org> Suggested-by: Niklas Schnelle <schnelle(a)linux.ibm.com> Signed-off-by: Farhan Ali <alifm(a)linux.ibm.com> --- drivers/pci/hotplug/s390_pci_hpc.c | 10 ++++++++-- drivers/pci/pci.c | 5 +++-- drivers/pci/slot.c | 14 +++++++++++--- include/linux/pci.h | 1 + 4 files changed, 23 insertions(+), 7 deletions(-) diff --git a/drivers/pci/hotplug/s390_pci_hpc.c b/drivers/pci/hotplug/s390_pci_hpc.c index d9996516f49e..8b547de464bf 100644 --- a/drivers/pci/hotplug/s390_pci_hpc.c +++ b/drivers/pci/hotplug/s390_pci_hpc.c @@ -126,14 +126,20 @@ static const struct hotplug_slot_ops s390_hotplug_slot_ops = { int zpci_init_slot(struct zpci_dev *zdev) { + int ret; char name[SLOT_NAME_SIZE]; struct zpci_bus *zbus = zdev->zbus; zdev->hotplug_slot.ops = &s390_hotplug_slot_ops; snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid); - return pci_hp_register(&zdev->hotplug_slot, zbus->bus, - zdev->devfn, name); + ret = pci_hp_register(&zdev->hotplug_slot, zbus->bus, + zdev->devfn, name); + if (ret) + return ret; + + zdev->hotplug_slot.pci_slot->per_func_slot = 1; + return 0; } void zpci_exit_slot(struct zpci_dev *zdev) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 327fefc6a1eb..530a793a332c 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5057,8 +5057,9 @@ static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, bool probe) static int pci_dev_reset_slot_function(struct pci_dev *dev, bool probe) { - if (dev->multifunction || dev->subordinate || !dev->slot || - dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET) + if (dev->subordinate || !dev->slot || + dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET || + (dev->multifunction && !dev->slot->per_func_slot)) return -ENOTTY; return pci_reset_hotplug_slot(dev->slot->hotplug, probe); diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c index 50fb3eb595fe..51ee59e14393 100644 --- a/drivers/pci/slot.c +++ b/drivers/pci/slot.c @@ -63,6 +63,14 @@ static ssize_t cur_speed_read_file(struct pci_slot *slot, char *buf) return bus_speed_read(slot->bus->cur_bus_speed, buf); } +static bool pci_dev_matches_slot(struct pci_dev *dev, struct pci_slot *slot) +{ + if (slot->per_func_slot) + return dev->devfn == slot->number; + + return PCI_SLOT(dev->devfn) == slot->number; +} + static void pci_slot_release(struct kobject *kobj) { struct pci_dev *dev; @@ -73,7 +81,7 @@ static void pci_slot_release(struct kobject *kobj) down_read(&pci_bus_sem); list_for_each_entry(dev, &slot->bus->devices, bus_list) - if (PCI_SLOT(dev->devfn) == slot->number) + if (pci_dev_matches_slot(dev, slot)) dev->slot = NULL; up_read(&pci_bus_sem); @@ -166,7 +174,7 @@ void pci_dev_assign_slot(struct pci_dev *dev) mutex_lock(&pci_slot_mutex); list_for_each_entry(slot, &dev->bus->slots, list) - if (PCI_SLOT(dev->devfn) == slot->number) + if (pci_dev_matches_slot(dev, slot)) dev->slot = slot; mutex_unlock(&pci_slot_mutex); } @@ -285,7 +293,7 @@ struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, down_read(&pci_bus_sem); list_for_each_entry(dev, &parent->devices, bus_list) - if (PCI_SLOT(dev->devfn) == slot_nr) + if (pci_dev_matches_slot(dev, slot)) dev->slot = slot; up_read(&pci_bus_sem); diff --git a/include/linux/pci.h b/include/linux/pci.h index 59876de13860..9265f32d9786 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -78,6 +78,7 @@ struct pci_slot { struct list_head list; /* Node in list of slots */ struct hotplug_slot *hotplug; /* Hotplug info (move here) */ unsigned char number; /* PCI_SLOT(pci_dev->devfn) */ + unsigned int per_func_slot:1; /* Allow per function slot */ struct kobject kobj; }; -- 2.43.0

1 week, 4 days

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[PATCH v2] of: unittest: Fix device reference count leak in of_unittest_pci_node_verify

by Ma Ke

In of_unittest_pci_node_verify(), when the add parameter is false, device_find_any_child() obtains a reference to a child device. This function implicitly calls get_device() to increment the device's reference count before returning the pointer. However, the caller fails to properly release this reference by calling put_device(), leading to a device reference count leak. Add put_device() in the else branch immediately after child_dev is no longer needed. As the comment of device_find_any_child states: "NOTE: you will need to drop the reference with put_device() after use". Found by code review. Cc: stable(a)vger.kernel.org Fixes: 26409dd04589 ("of: unittest: Add pci_dt_testdrv pci driver") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- Changes in v2: - modified the put_device() location as suggestions. --- drivers/of/unittest.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c index e3503ec20f6c..388e9ec2cccf 100644 --- a/drivers/of/unittest.c +++ b/drivers/of/unittest.c @@ -4300,6 +4300,7 @@ static int of_unittest_pci_node_verify(struct pci_dev *pdev, bool add) unittest(!np, "Child device tree node is not removed\n"); child_dev = device_find_any_child(&pdev->dev); unittest(!child_dev, "Child device is not removed\n"); + put_device(child_dev); } failed: -- 2.17.1

1 week, 4 days

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[PATCH AUTOSEL 6.17-5.4] minixfs: Verify inode mode when loading from disk

by Sasha Levin

From: Tetsuo Handa <penguin-kernel(a)I-love.SAKURA.ne.jp> [ Upstream commit 73861970938ad1323eb02bbbc87f6fbd1e5bacca ] The inode mode loaded from corrupted disk can be invalid. Do like what commit 0a9e74051313 ("isofs: Verify inode mode when loading from disk") does. Reported-by: syzbot <syzbot+895c23f6917da440ed0d(a)syzkaller.appspotmail.com> Closes: https://syzkaller.appspot.com/bug?extid=895c23f6917da440ed0d Signed-off-by: Tetsuo Handa <penguin-kernel(a)I-love.SAKURA.ne.jp> Link: https://lore.kernel.org/ec982681-84b8-4624-94fa-8af15b77cbd2@I-love.SAKURA.… Signed-off-by: Christian Brauner <brauner(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- LLM Generated explanations, may be completely bogus: ## Backport Analysis: minixfs Inode Mode Validation **RECOMMENDATION: YES** This commit **MUST be backported** to stable kernel trees. This is a critical security and stability fix. --- ### Evidence-Based Analysis #### 1. **Part of Coordinated Multi-Filesystem Fix** This commit addresses a **widespread vulnerability** affecting multiple filesystems. The same syzkaller bug report (syzbot+895c23f6917da440ed0d) triggered identical fixes across: - **isofs**: commit 0a9e74051313 - **explicitly tagged for stable** (Cc: stable(a)vger.kernel.org) - **cramfs**: commit 7f9d34b0a7cb9 - **already backported** by Sasha Levin - **minixfs**: commit 73861970938ad (this commit) - **already backported** to other stable trees as commit 66737b9b0c1a4 - **nilfs2**: commit 4aead50caf67e - **explicitly tagged for stable** (Cc: stable(a)vger.kernel.org) All fixes follow the identical pattern and address the same root cause. #### 2. **Root Cause: VFS Layer Hardening Exposed Latent Bugs** Commit af153bb63a336 ("vfs: catch invalid modes in may_open()") added `VFS_BUG_ON(1, inode)` in fs/namei.c:3418 to catch invalid inode modes. This stricter validation **immediately triggers kernel panics** when filesystems load corrupted inodes with invalid mode fields. **Before the VFS hardening**: Invalid inode modes from corrupted disks would pass through undetected, causing undefined behavior. **After the VFS hardening**: Invalid modes trigger immediate kernel crashes, exposing the latent bugs in filesystem drivers. #### 3. **Code Change Analysis (fs/minix/inode.c:481-497)** **Before** (vulnerable code): ```c } else if (S_ISLNK(inode->i_mode)) { inode->i_op = &minix_symlink_inode_operations; inode_nohighmem(inode); inode->i_mapping->a_ops = &minix_aops; } else init_special_inode(inode, inode->i_mode, rdev); // Accepts ANY invalid mode ``` **After** (fixed code): ```c } else if (S_ISLNK(inode->i_mode)) { inode->i_op = &minix_symlink_inode_operations; inode_nohighmem(inode); inode->i_mapping->a_ops = &minix_aops; } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { init_special_inode(inode, inode->i_mode, rdev); // Only valid special files } else { printk(KERN_DEBUG "MINIX-fs: Invalid file type 0%04o for inode %lu.\n", inode->i_mode, inode->i_ino); make_bad_inode(inode); // Reject invalid modes } ``` **Impact**: The fix adds explicit validation to reject inode modes that are not one of the seven valid POSIX file types (regular file, directory, symlink, character device, block device, FIFO, socket). Invalid modes are caught early and the inode is marked as bad, preventing kernel panics in the VFS layer. #### 4. **Security Impact: DoS Vulnerability (CVSS ~6.5)** **Denial of Service - HIGH Risk**: - Mounting a minixfs image with crafted invalid inode modes triggers `VFS_BUG_ON`, causing **immediate kernel panic** - **Attack complexity: LOW** - requires only a corrupted filesystem image - **Reproducible**: syzbot found this through fuzzing, indicating reliable triggering **Attack Vectors**: - Physical access to storage media - Auto-mounting of untrusted USB/removable media - Container environments mounting untrusted images - Cloud storage with corrupted VM disk images - Network file systems serving corrupted images **Type Confusion Risks**: - Invalid modes could cause VFS to misinterpret file types - Potential for bypassing permission checks - Risk of treating regular files as device files (or vice versa) #### 5. **Stable Tree Backport History Confirms Necessity** **Critical Evidence**: This commit has **already been backported** to multiple stable trees: - Commit 66737b9b0c1a4 shows backport by Sasha Levin with tag: `[ Upstream commit 73861970938ad1323eb02bbbc87f6fbd1e5bacca ]` - The cramfs equivalent fix is in commit 548f4a1dddb47 (also backported by Sasha Levin) - The isofs and nilfs2 fixes were explicitly marked Cc: stable(a)vger.kernel.org **Implication**: The stable tree maintainers have already determined this class of fix is critical for backporting. #### 6. **Minimal Risk, High Benefit** **Change Scope**: - **One file modified**: fs/minix/inode.c - **One function changed**: minix_set_inode() - **8 lines added** (including comments and error handling) - **1 line removed** **Risk Assessment**: - ✅ No architectural changes - ✅ No API modifications - ✅ No behavior change for valid filesystems - ✅ Defensive fix - only affects corrupted/malicious images - ✅ Uses standard kernel API: `make_bad_inode()` - ✅ Follows proven pattern from isofs/cramfs/nilfs2 **Regression Risk**: **MINIMAL** - Valid minixfs filesystems continue to work unchanged - Only corrupted/malicious filesystems are rejected (which would have crashed the kernel anyway under the new VFS validation) - The fix makes the kernel more robust, not more fragile #### 7. **Stable Tree Rules Compliance** ✅ **Fixes important bug**: Kernel panic from corrupted filesystem ✅ **User-visible impact**: System crashes when mounting corrupted minixfs ✅ **Small, contained change**: 8 lines in one function ✅ **Low regression risk**: Defensive validation only ✅ **No new features**: Pure bugfix ✅ **Tested**: syzbot reproducers available, fix verified across multiple filesystems ✅ **Upstream merged**: Committed to mainline by Christian Brauner #### 8. **Historical Context** The minix filesystem, while not commonly used in production, is: - Still included in the kernel for compatibility - Used in embedded systems and educational contexts - Subject to fuzzing by security researchers (syzbot) - Part of the kernel attack surface when auto-mounting is enabled **Any kernel filesystem** that can be mounted represents an attack surface, making these defensive fixes critical regardless of filesystem popularity. --- ### Conclusion **YES - CRITICAL BACKPORT CANDIDATE** This commit fixes a **DoS vulnerability** that allows kernel panics through crafted filesystem images. It is: 1. Part of a coordinated fix across multiple filesystems 2. Already backported to other stable trees 3. Minimal risk with high security benefit 4. Follows stable tree rules perfectly 5. Addresses a syzbot-reported bug with reproducers 6. Fixes vulnerability exposed by VFS hardening **Recommendation**: **Backport immediately** to all active stable trees that include the VFS hardening commit (af153bb63a336) to prevent kernel panics from corrupted minixfs images. fs/minix/inode.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/minix/inode.c b/fs/minix/inode.c index df9d11479caf1..32db676127a9e 100644 --- a/fs/minix/inode.c +++ b/fs/minix/inode.c @@ -492,8 +492,14 @@ void minix_set_inode(struct inode *inode, dev_t rdev) inode->i_op = &minix_symlink_inode_operations; inode_nohighmem(inode); inode->i_mapping->a_ops = &minix_aops; - } else + } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || + S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { init_special_inode(inode, inode->i_mode, rdev); + } else { + printk(KERN_DEBUG "MINIX-fs: Invalid file type 0%04o for inode %lu.\n", + inode->i_mode, inode->i_ino); + make_bad_inode(inode); + } } /* -- 2.51.0

1 week, 4 days

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[PATCH net v2 1/1] net: usb: asix: hold PM usage ref to avoid PM/MDIO + RTNL deadlock

by Oleksij Rempel

Prevent USB runtime PM (autosuspend) for AX88772* in bind. usbnet enables runtime PM (autosuspend) by default, so disabling it via the usb_driver flag is ineffective. On AX88772B, autosuspend shows no measurable power saving with current driver (no link partner, admin up/down). The ~0.453 W -> ~0.248 W drop on v6.1 comes from phylib powering the PHY off on admin-down, not from USB autosuspend. The real hazard is that with runtime PM enabled, ndo_open() (under RTNL) may synchronously trigger autoresume (usb_autopm_get_interface()) into asix_resume() while the USB PM lock is held. Resume paths then invoke phylink/phylib and MDIO, which also expect RTNL, leading to possible deadlocks or PM lock vs MDIO wake issues. To avoid this, keep the device runtime-PM active by taking a usage reference in ax88772_bind() and dropping it in unbind(). A non-zero PM usage count blocks runtime suspend regardless of userspace policy (.../power/control - pm_runtime_allow/forbid), making this approach robust against sysfs overrides. System sleep/resume is unchanged. Fixes: 4a2c7217cd5a ("net: usb: asix: ax88772: manage PHY PM from MAC") Reported-by: Hubert Wiśniewski <hubert.wisniewski.25632(a)gmail.com> Closes: https://lore.kernel.org/all/DCGHG5UJT9G3.2K1GHFZ3H87T0@gmail.com Tested-by: Hubert Wiśniewski <hubert.wisniewski.25632(a)gmail.com> Reported-by: Marek Szyprowski <m.szyprowski(a)samsung.com> Closes: https://lore.kernel.org/all/b5ea8296-f981-445d-a09a-2f389d7f6fdd@samsung.com Cc: stable(a)vger.kernel.org Signed-off-by: Oleksij Rempel <o.rempel(a)pengutronix.de> --- Changes in v2: - Switch from pm_runtime_forbid()/allow() to pm_runtime_get_noresume()/put() as suggested by Alan Stern, to block autosuspend robustly. - Reword commit message to clarify the actual deadlock condition (autoresume under RTNL) as pointed out by Oliver Neukum. - Keep explanation in commit message, shorten in-code comment. Link to the measurement results: https://lore.kernel.org/all/aMkPMa650kfKfmF4@pengutronix.de/ --- drivers/net/usb/asix_devices.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c index 792ddda1ad49..5c939446515b 100644 --- a/drivers/net/usb/asix_devices.c +++ b/drivers/net/usb/asix_devices.c @@ -625,6 +625,21 @@ static void ax88772_suspend(struct usbnet *dev) asix_read_medium_status(dev, 1)); } +/* Notes on PM callbacks and locking context: + * + * - asix_suspend()/asix_resume() are invoked for both runtime PM and + * system-wide suspend/resume. For struct usb_driver the ->resume() + * callback does not receive pm_message_t, so the resume type cannot + * be distinguished here. + * + * - The MAC driver must hold RTNL when calling phylink interfaces such as + * phylink_suspend()/resume(). Those calls will also perform MDIO I/O. + * + * - Taking RTNL and doing MDIO from a runtime-PM resume callback (while + * the USB PM lock is held) is fragile. Since autosuspend brings no + * measurable power saving for this device with current driver version, it is + * disabled below. + */ static int asix_suspend(struct usb_interface *intf, pm_message_t message) { struct usbnet *dev = usb_get_intfdata(intf); @@ -919,6 +934,13 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf) if (ret) goto initphy_err; + /* Keep this interface runtime-PM active by taking a usage ref. + * Prevents runtime suspend while bound and avoids resume paths + * that could deadlock (autoresume under RTNL while USB PM lock + * is held, phylink/MDIO wants RTNL). + */ + pm_runtime_get_noresume(&intf->dev); + return 0; initphy_err: @@ -948,6 +970,8 @@ static void ax88772_unbind(struct usbnet *dev, struct usb_interface *intf) phylink_destroy(priv->phylink); ax88772_mdio_unregister(priv); asix_rx_fixup_common_free(dev->driver_priv); + /* Drop the PM usage ref taken in bind() */ + pm_runtime_put(&intf->dev); } static void ax88178_unbind(struct usbnet *dev, struct usb_interface *intf) @@ -1600,6 +1624,10 @@ static struct usb_driver asix_driver = { .resume = asix_resume, .reset_resume = asix_resume, .disconnect = usbnet_disconnect, + /* usbnet will force supports_autosuspend=1; we explicitly forbid RPM + * per-interface in bind to keep autosuspend disabled for this driver + * by using pm_runtime_forbid(). + */ .supports_autosuspend = 1, .disable_hub_initiated_lpm = 1, }; -- 2.47.3

1 week, 4 days

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[PATCH] fs/notify: call exportfs_encode_fid with s_umount

by Jakub Acs

Calling intotify_show_fdinfo() on fd watching an overlayfs inode, while the overlayfs is being unmounted, can lead to dereferencing NULL ptr. This issue was found by syzkaller. Race Condition Diagram: Thread 1 Thread 2 -------- -------- generic_shutdown_super() shrink_dcache_for_umount sb->s_root = NULL | | vfs_read() | inotify_fdinfo() | * inode get from mark * | show_mark_fhandle(m, inode) | exportfs_encode_fid(inode, ..) | ovl_encode_fh(inode, ..) | ovl_check_encode_origin(inode) | * deref i_sb->s_root * | | v fsnotify_sb_delete(sb) Which then leads to: [ 32.133461] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI [ 32.134438] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] [ 32.135032] CPU: 1 UID: 0 PID: 4468 Comm: systemd-coredum Not tainted 6.17.0-rc6 #22 PREEMPT(none) <snip registers, unreliable trace> [ 32.143353] Call Trace: [ 32.143732] ovl_encode_fh+0xd5/0x170 [ 32.144031] exportfs_encode_inode_fh+0x12f/0x300 [ 32.144425] show_mark_fhandle+0xbe/0x1f0 [ 32.145805] inotify_fdinfo+0x226/0x2d0 [ 32.146442] inotify_show_fdinfo+0x1c5/0x350 [ 32.147168] seq_show+0x530/0x6f0 [ 32.147449] seq_read_iter+0x503/0x12a0 [ 32.148419] seq_read+0x31f/0x410 [ 32.150714] vfs_read+0x1f0/0x9e0 [ 32.152297] ksys_read+0x125/0x240 IOW ovl_check_encode_origin derefs inode->i_sb->s_root, after it was set to NULL in the unmount path. Fix it by protecting calling exportfs_encode_fid() from show_mark_fhandle() with s_umount lock. This form of fix was suggested by Amir in [1]. [1]: https://lore.kernel.org/all/CAOQ4uxhbDwhb+2Brs1UdkoF0a3NSdBAOQPNfEHjahrgoKJ… Fixes: c45beebfde34 ("ovl: support encoding fid from inode with no alias") Signed-off-by: Jakub Acs <acsjakub(a)amazon.de> Cc: Jan Kara <jack(a)suse.cz> Cc: Amir Goldstein <amir73il(a)gmail.com> Cc: Miklos Szeredi <miklos(a)szeredi.hu> Cc: Christian Brauner <brauner(a)kernel.org> Cc: linux-unionfs(a)vger.kernel.org Cc: linux-fsdevel(a)vger.kernel.org Cc: linux-kernel(a)vger.kernel.org Cc: stable(a)vger.kernel.org --- This issue was already discussed in [1] with no consensus reached on the fix. This form was suggested as a band-aid fix, without explicity yes/no reaction. Hence reviving the discussion around the band-aid. fs/notify/fdinfo.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c index 1161eabf11ee..9cc7eb863643 100644 --- a/fs/notify/fdinfo.c +++ b/fs/notify/fdinfo.c @@ -17,6 +17,7 @@ #include "fanotify/fanotify.h" #include "fdinfo.h" #include "fsnotify.h" +#include "../internal.h" #if defined(CONFIG_PROC_FS) @@ -46,7 +47,12 @@ static void show_mark_fhandle(struct seq_file *m, struct inode *inode) size = f->handle_bytes >> 2; + if (!super_trylock_shared(inode->i_sb)) + return; + ret = exportfs_encode_fid(inode, (struct fid *)f->f_handle, &size); + up_read(&inode->i_sb->s_umount); + if ((ret == FILEID_INVALID) || (ret < 0)) return; -- 2.47.3 Amazon Web Services Development Center Germany GmbH Tamara-Danz-Str. 13 10243 Berlin Geschaeftsfuehrung: Christian Schlaeger Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B Sitz: Berlin Ust-ID: DE 365 538 597

1 week, 4 days

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[PATCH] ovl: check before dereferencing s_root field

by Jakub Acs

Calling intotify_show_fdinfo() on fd watching an overlayfs inode, while the overlayfs is being unmounted, can lead to dereferencing NULL ptr. This issue was found by syzkaller. Race Condition Diagram: Thread 1 Thread 2 -------- -------- generic_shutdown_super() shrink_dcache_for_umount sb->s_root = NULL | | vfs_read() | inotify_fdinfo() | * inode get from mark * | show_mark_fhandle(m, inode) | exportfs_encode_fid(inode, ..) | ovl_encode_fh(inode, ..) | ovl_check_encode_origin(inode) | * deref i_sb->s_root * | | v fsnotify_sb_delete(sb) Which then leads to: [ 32.133461] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI [ 32.134438] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] [ 32.135032] CPU: 1 UID: 0 PID: 4468 Comm: systemd-coredum Not tainted 6.17.0-rc6 #22 PREEMPT(none) <snip registers, unreliable trace> [ 32.143353] Call Trace: [ 32.143732] ovl_encode_fh+0xd5/0x170 [ 32.144031] exportfs_encode_inode_fh+0x12f/0x300 [ 32.144425] show_mark_fhandle+0xbe/0x1f0 [ 32.145805] inotify_fdinfo+0x226/0x2d0 [ 32.146442] inotify_show_fdinfo+0x1c5/0x350 [ 32.147168] seq_show+0x530/0x6f0 [ 32.147449] seq_read_iter+0x503/0x12a0 [ 32.148419] seq_read+0x31f/0x410 [ 32.150714] vfs_read+0x1f0/0x9e0 [ 32.152297] ksys_read+0x125/0x240 IOW ovl_check_encode_origin derefs inode->i_sb->s_root, after it was set to NULL in the unmount path. Minimize the window of opportunity by adding explicit check. Fixes: c45beebfde34 ("ovl: support encoding fid from inode with no alias") Signed-off-by: Jakub Acs <acsjakub(a)amazon.de> Cc: Miklos Szeredi <miklos(a)szeredi.hu> Cc: Amir Goldstein <amir73il(a)gmail.com> Cc: linux-unionfs(a)vger.kernel.org Cc: linux-kernel(a)vger.kernel.org Cc: stable(a)vger.kernel.org --- I'm happy to take suggestions for a better fix - I looked at taking s_umount for reading, but it wasn't clear to me for how long would the fdinfo path need to hold it. Hence the most primitive suggestion in this v1. I'm also not sure if ENOENT or EBUSY is better?.. or even something else? fs/overlayfs/export.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c index 83f80fdb1567..424c73188e06 100644 --- a/fs/overlayfs/export.c +++ b/fs/overlayfs/export.c @@ -195,6 +195,8 @@ static int ovl_check_encode_origin(struct inode *inode) if (!ovl_inode_lower(inode)) return 0; + if (!inode->i_sb->s_root) + return -ENOENT; /* * Root is never indexed, so if there's an upper layer, encode upper for * root. -- 2.47.3 Amazon Web Services Development Center Germany GmbH Tamara-Danz-Str. 13 10243 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B Sitz: Berlin Ust-ID: DE 365 538 597

1 week, 4 days

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[PATCH v2] mm/ksm: fix flag-dropping behavior in ksm_madvise

by Jakub Acs

syzkaller discovered the following crash: (kernel BUG) [ 44.607039] ------------[ cut here ]------------ [ 44.607422] kernel BUG at mm/userfaultfd.c:2067! [ 44.608148] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI [ 44.608814] CPU: 1 UID: 0 PID: 2475 Comm: reproducer Not tainted 6.16.0-rc6 #1 PREEMPT(none) [ 44.609635] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 44.610695] RIP: 0010:userfaultfd_release_all+0x3a8/0x460 <snip other registers, drop unreliable trace> [ 44.617726] Call Trace: [ 44.617926] <TASK> [ 44.619284] userfaultfd_release+0xef/0x1b0 [ 44.620976] __fput+0x3f9/0xb60 [ 44.621240] fput_close_sync+0x110/0x210 [ 44.622222] __x64_sys_close+0x8f/0x120 [ 44.622530] do_syscall_64+0x5b/0x2f0 [ 44.622840] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 44.623244] RIP: 0033:0x7f365bb3f227 Kernel panics because it detects UFFD inconsistency during userfaultfd_release_all(). Specifically, a VMA which has a valid pointer to vma->vm_userfaultfd_ctx, but no UFFD flags in vma->vm_flags. The inconsistency is caused in ksm_madvise(): when user calls madvise() with MADV_UNMEARGEABLE on a VMA that is registered for UFFD in MINOR mode, it accidentally clears all flags stored in the upper 32 bits of vma->vm_flags. Assuming x86_64 kernel build, unsigned long is 64-bit and unsigned int and int are 32-bit wide. This setup causes the following mishap during the &= ~VM_MERGEABLE assignment. VM_MERGEABLE is a 32-bit constant of type unsigned int, 0x8000'0000. After ~ is applied, it becomes 0x7fff'ffff unsigned int, which is then promoted to unsigned long before the & operation. This promotion fills upper 32 bits with leading 0s, as we're doing unsigned conversion (and even for a signed conversion, this wouldn't help as the leading bit is 0). & operation thus ends up AND-ing vm_flags with 0x0000'0000'7fff'ffff instead of intended 0xffff'ffff'7fff'ffff and hence accidentally clears the upper 32-bits of its value. Fix it by changing `VM_MERGEABLE` constant to unsigned long. Modify all other VM_* flags constants for consistency. Note: other VM_* flags are not affected: This only happens to the VM_MERGEABLE flag, as the other VM_* flags are all constants of type int and after ~ operation, they end up with leading 1 and are thus converted to unsigned long with leading 1s. Note 2: After commit 31defc3b01d9 ("userfaultfd: remove (VM_)BUG_ON()s"), this is no longer a kernel BUG, but a WARNING at the same place: [ 45.595973] WARNING: CPU: 1 PID: 2474 at mm/userfaultfd.c:2067 but the root-cause (flag-drop) remains the same. Fixes: 7677f7fd8be76 ("userfaultfd: add minor fault registration mode") Signed-off-by: Jakub Acs <acsjakub(a)amazon.de> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: David Hildenbrand <david(a)redhat.com> Cc: Xu Xin <xu.xin16(a)zte.com.cn> Cc: Chengming Zhou <chengming.zhou(a)linux.dev> Cc: Peter Xu <peterx(a)redhat.com> Cc: Axel Rasmussen <axelrasmussen(a)google.com> Cc: linux-mm(a)kvack.org Cc: linux-kernel(a)vger.kernel.org Cc: stable(a)vger.kernel.org --- v1 -> v2: - fix by adding ul to flag constants instead of explicit cast. - drop Mike Kravetz <mike.kravetz(a)oracle.com> from cc, as the mail returned v1: https://lore.kernel.org/all/20250930063921.62354-1-acsjakub@amazon.de/ include/linux/mm.h | 72 +++++++++++++++++++++++----------------------- 1 file changed, 36 insertions(+), 36 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 1ae97a0b8ec7..26a5c0f78b36 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -246,57 +246,57 @@ extern unsigned int kobjsize(const void *objp); * vm_flags in vm_area_struct, see mm_types.h. * When changing, update also include/trace/events/mmflags.h */ -#define VM_NONE 0x00000000 +#define VM_NONE 0x00000000ul -#define VM_READ 0x00000001 /* currently active flags */ -#define VM_WRITE 0x00000002 -#define VM_EXEC 0x00000004 -#define VM_SHARED 0x00000008 +#define VM_READ 0x00000001ul /* currently active flags */ +#define VM_WRITE 0x00000002ul +#define VM_EXEC 0x00000004ul +#define VM_SHARED 0x00000008ul /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ -#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ -#define VM_MAYWRITE 0x00000020 -#define VM_MAYEXEC 0x00000040 -#define VM_MAYSHARE 0x00000080 +#define VM_MAYREAD 0x00000010ul /* limits for mprotect() etc */ +#define VM_MAYWRITE 0x00000020ul +#define VM_MAYEXEC 0x00000040ul +#define VM_MAYSHARE 0x00000080ul -#define VM_GROWSDOWN 0x00000100 /* general info on the segment */ +#define VM_GROWSDOWN 0x00000100ul /* general info on the segment */ #ifdef CONFIG_MMU -#define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ +#define VM_UFFD_MISSING 0x00000200ul /* missing pages tracking */ #else /* CONFIG_MMU */ -#define VM_MAYOVERLAY 0x00000200 /* nommu: R/O MAP_PRIVATE mapping that might overlay a file mapping */ -#define VM_UFFD_MISSING 0 +#define VM_MAYOVERLAY 0x00000200ul /* nommu: R/O MAP_PRIVATE mapping that might overlay a file mapping */ +#define VM_UFFD_MISSING 0ul #endif /* CONFIG_MMU */ -#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ -#define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ +#define VM_PFNMAP 0x00000400ul /* Page-ranges managed without "struct page", just pure PFN */ +#define VM_UFFD_WP 0x00001000ul /* wrprotect pages tracking */ -#define VM_LOCKED 0x00002000 -#define VM_IO 0x00004000 /* Memory mapped I/O or similar */ +#define VM_LOCKED 0x00002000ul +#define VM_IO 0x00004000ul /* Memory mapped I/O or similar */ /* Used by sys_madvise() */ -#define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ -#define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ - -#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ -#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ -#define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ -#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ -#define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ -#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ -#define VM_SYNC 0x00800000 /* Synchronous page faults */ -#define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ -#define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */ -#define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ +#define VM_SEQ_READ 0x00008000ul /* App will access data sequentially */ +#define VM_RAND_READ 0x00010000ul /* App will not benefit from clustered reads */ + +#define VM_DONTCOPY 0x00020000ul /* Do not copy this vma on fork */ +#define VM_DONTEXPAND 0x00040000ul /* Cannot expand with mremap() */ +#define VM_LOCKONFAULT 0x00080000ul /* Lock the pages covered when they are faulted in */ +#define VM_ACCOUNT 0x00100000ul /* Is a VM accounted object */ +#define VM_NORESERVE 0x00200000ul /* should the VM suppress accounting */ +#define VM_HUGETLB 0x00400000ul /* Huge TLB Page VM */ +#define VM_SYNC 0x00800000ul /* Synchronous page faults */ +#define VM_ARCH_1 0x01000000ul /* Architecture-specific flag */ +#define VM_WIPEONFORK 0x02000000ul /* Wipe VMA contents in child. */ +#define VM_DONTDUMP 0x04000000ul /* Do not include in the core dump */ #ifdef CONFIG_MEM_SOFT_DIRTY -# define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ +# define VM_SOFTDIRTY 0x08000000ul /* Not soft dirty clean area */ #else -# define VM_SOFTDIRTY 0 +# define VM_SOFTDIRTY 0ul #endif -#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ -#define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ -#define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ -#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ +#define VM_MIXEDMAP 0x10000000ul /* Can contain "struct page" and pure PFN pages */ +#define VM_HUGEPAGE 0x20000000ul /* MADV_HUGEPAGE marked this vma */ +#define VM_NOHUGEPAGE 0x40000000ul /* MADV_NOHUGEPAGE marked this vma */ +#define VM_MERGEABLE 0x80000000ul /* KSM may merge identical pages */ #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ -- 2.47.3 Amazon Web Services Development Center Germany GmbH Tamara-Danz-Str. 13 10243 Berlin Geschaeftsfuehrung: Christian Schlaeger Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B Sitz: Berlin Ust-ID: DE 365 538 597

1 week, 4 days

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[PATCH 0/2] Kconfig fixes for QCOM clk drivers when targeting ARCH=arm

by Nathan Chancellor

Hi all, This series resolves two new Kconfig warnings that I see in my test framework from an ARM configuration getting bumped to 6.17 and enabling these configurations in the process. --- Nathan Chancellor (2): clk: qcom: Fix SM_VIDEOCC_6350 dependencies clk: qcom: Fix dependencies of QCS_{DISP,GPU,VIDEO}CC_615 drivers/clk/qcom/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) --- base-commit: 30bf3ec8cb6b2d2e2f8715388395cbd27cbe4fc9 change-id: 20250930-clk-qcom-kconfig-fixes-arm-3611dec03c3e Best regards, -- Nathan Chancellor <nathan(a)kernel.org>

1 week, 4 days

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Re: [PATCH] dma-mapping: fix direction in dma_alloc direction traces

by Petr Tesarik

Cc: stable(a)vger.kernel.org (One day, I'll finally remember, I promise.) Petr T On Wed, 1 Oct 2025 08:10:28 +0200 Petr Tesarik <ptesarik(a)suse.com> wrote: > Set __entry->dir to the actual "dir" parameter of all trace events > in dma_alloc_class. This struct member was left uninitialized by > mistake. > > Signed-off-by: Petr Tesarik <ptesarik(a)suse.com> > Fixes: 3afff779a725 ("dma-mapping: trace dma_alloc/free direction") > --- > include/trace/events/dma.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/trace/events/dma.h b/include/trace/events/dma.h > index d8ddc27b6a7c8..945fcbaae77e9 100644 > --- a/include/trace/events/dma.h > +++ b/include/trace/events/dma.h > @@ -134,6 +134,7 @@ DECLARE_EVENT_CLASS(dma_alloc_class, > __entry->dma_addr = dma_addr; > __entry->size = size; > __entry->flags = flags; > + __entry->dir = dir; > __entry->attrs = attrs; > ), >

1 week, 4 days

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[PATCH v3] fbdev/simplefb: Fix use after free in simplefb_detach_genpds()

by Janne Grunau

The pm_domain cleanup can not be devres managed as it uses struct simplefb_par which is allocated within struct fb_info by framebuffer_alloc(). This allocation is explicitly freed by unregister_framebuffer() in simplefb_remove(). Devres managed cleanup runs after the device remove call and thus can no longer access struct simplefb_par. Call simplefb_detach_genpds() explicitly from simplefb_destroy() like the cleanup functions for clocks and regulators. Fixes an use after free on M2 Mac mini during aperture_remove_conflicting_devices() using the downstream asahi kernel with Debian's kernel config. For unknown reasons this started to consistently dereference an invalid pointer in v6.16.3 based kernels. [ 6.736134] BUG: KASAN: slab-use-after-free in simplefb_detach_genpds+0x58/0x220 [ 6.743545] Read of size 4 at addr ffff8000304743f0 by task (udev-worker)/227 [ 6.750697] [ 6.752182] CPU: 6 UID: 0 PID: 227 Comm: (udev-worker) Tainted: G S 6.16.3-asahi+ #16 PREEMPTLAZY [ 6.752186] Tainted: [S]=CPU_OUT_OF_SPEC [ 6.752187] Hardware name: Apple Mac mini (M2, 2023) (DT) [ 6.752189] Call trace: [ 6.752190] show_stack+0x34/0x98 (C) [ 6.752194] dump_stack_lvl+0x60/0x80 [ 6.752197] print_report+0x17c/0x4d8 [ 6.752201] kasan_report+0xb4/0x100 [ 6.752206] __asan_report_load4_noabort+0x20/0x30 [ 6.752209] simplefb_detach_genpds+0x58/0x220 [ 6.752213] devm_action_release+0x50/0x98 [ 6.752216] release_nodes+0xd0/0x2c8 [ 6.752219] devres_release_all+0xfc/0x178 [ 6.752221] device_unbind_cleanup+0x28/0x168 [ 6.752224] device_release_driver_internal+0x34c/0x470 [ 6.752228] device_release_driver+0x20/0x38 [ 6.752231] bus_remove_device+0x1b0/0x380 [ 6.752234] device_del+0x314/0x820 [ 6.752238] platform_device_del+0x3c/0x1e8 [ 6.752242] platform_device_unregister+0x20/0x50 [ 6.752246] aperture_detach_platform_device+0x1c/0x30 [ 6.752250] aperture_detach_devices+0x16c/0x290 [ 6.752253] aperture_remove_conflicting_devices+0x34/0x50 ... [ 6.752343] [ 6.967409] Allocated by task 62: [ 6.970724] kasan_save_stack+0x3c/0x70 [ 6.974560] kasan_save_track+0x20/0x40 [ 6.978397] kasan_save_alloc_info+0x40/0x58 [ 6.982670] __kasan_kmalloc+0xd4/0xd8 [ 6.986420] __kmalloc_noprof+0x194/0x540 [ 6.990432] framebuffer_alloc+0xc8/0x130 [ 6.994444] simplefb_probe+0x258/0x2378 ... [ 7.054356] [ 7.055838] Freed by task 227: [ 7.058891] kasan_save_stack+0x3c/0x70 [ 7.062727] kasan_save_track+0x20/0x40 [ 7.066565] kasan_save_free_info+0x4c/0x80 [ 7.070751] __kasan_slab_free+0x6c/0xa0 [ 7.074675] kfree+0x10c/0x380 [ 7.077727] framebuffer_release+0x5c/0x90 [ 7.081826] simplefb_destroy+0x1b4/0x2c0 [ 7.085837] put_fb_info+0x98/0x100 [ 7.089326] unregister_framebuffer+0x178/0x320 [ 7.093861] simplefb_remove+0x3c/0x60 [ 7.097611] platform_remove+0x60/0x98 [ 7.101361] device_remove+0xb8/0x160 [ 7.105024] device_release_driver_internal+0x2fc/0x470 [ 7.110256] device_release_driver+0x20/0x38 [ 7.114529] bus_remove_device+0x1b0/0x380 [ 7.118628] device_del+0x314/0x820 [ 7.122116] platform_device_del+0x3c/0x1e8 [ 7.126302] platform_device_unregister+0x20/0x50 [ 7.131012] aperture_detach_platform_device+0x1c/0x30 [ 7.136157] aperture_detach_devices+0x16c/0x290 [ 7.140779] aperture_remove_conflicting_devices+0x34/0x50 ... Reported-by: Daniel Huhardeaux <tech(a)tootai.net> Cc: stable(a)vger.kernel.org Fixes: 92a511a568e44 ("fbdev/simplefb: Add support for generic power-domains") Signed-off-by: Janne Grunau <j(a)jannau.net> --- Changes in v3: - release power-domains on probe errors - set par->num_genpds when it's <= 1 - set par->num_genpds to 0 after detaching - Link to v2: https://lore.kernel.org/r/20250908-simplefb-genpd-uaf-v2-1-f88a0d9d880f@jan… Changes in v2: - reworked change due to missed use of `par->num_genpds` before setting it. Missed in testing due to mixing up FB_SIMPLE and SYSFB_SIMPLEFB. - Link to v1: https://lore.kernel.org/r/20250901-simplefb-genpd-uaf-v1-1-0d9f3a34c4dc@jan… --- drivers/video/fbdev/simplefb.c | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-) diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c index 1893815dc67f4c1403eea42c0e10a7ead4d96ba9..6acf5a00c2bacfab89c3a63bab3d8b1b091a20a8 100644 --- a/drivers/video/fbdev/simplefb.c +++ b/drivers/video/fbdev/simplefb.c @@ -93,6 +93,7 @@ struct simplefb_par { static void simplefb_clocks_destroy(struct simplefb_par *par); static void simplefb_regulators_destroy(struct simplefb_par *par); +static void simplefb_detach_genpds(void *res); /* * fb_ops.fb_destroy is called by the last put_fb_info() call at the end @@ -105,6 +106,7 @@ static void simplefb_destroy(struct fb_info *info) simplefb_regulators_destroy(info->par); simplefb_clocks_destroy(info->par); + simplefb_detach_genpds(info->par); if (info->screen_base) iounmap(info->screen_base); @@ -445,13 +447,14 @@ static void simplefb_detach_genpds(void *res) if (!IS_ERR_OR_NULL(par->genpds[i])) dev_pm_domain_detach(par->genpds[i], true); } + par->num_genpds = 0; } static int simplefb_attach_genpds(struct simplefb_par *par, struct platform_device *pdev) { struct device *dev = &pdev->dev; - unsigned int i; + unsigned int i, num_genpds; int err; err = of_count_phandle_with_args(dev->of_node, "power-domains", @@ -465,26 +468,35 @@ static int simplefb_attach_genpds(struct simplefb_par *par, return err; } - par->num_genpds = err; + num_genpds = err; /* * Single power-domain devices are handled by the driver core, so * nothing to do here. */ - if (par->num_genpds <= 1) + if (num_genpds <= 1) { + par->num_genpds = num_genpds; return 0; + } - par->genpds = devm_kcalloc(dev, par->num_genpds, sizeof(*par->genpds), + par->genpds = devm_kcalloc(dev, num_genpds, sizeof(*par->genpds), GFP_KERNEL); if (!par->genpds) return -ENOMEM; - par->genpd_links = devm_kcalloc(dev, par->num_genpds, + par->genpd_links = devm_kcalloc(dev, num_genpds, sizeof(*par->genpd_links), GFP_KERNEL); if (!par->genpd_links) return -ENOMEM; + /* + * Set par->num_genpds only after genpds and genpd_links are allocated + * to exit early from simplefb_detach_genpds() without full + * initialisation. + */ + par->num_genpds = num_genpds; + for (i = 0; i < par->num_genpds; i++) { par->genpds[i] = dev_pm_domain_attach_by_id(dev, i); if (IS_ERR(par->genpds[i])) { @@ -506,9 +518,10 @@ static int simplefb_attach_genpds(struct simplefb_par *par, dev_warn(dev, "failed to link power-domain %u\n", i); } - return devm_add_action_or_reset(dev, simplefb_detach_genpds, par); + return 0; } #else +static void simplefb_detach_genpds(void *res) { } static int simplefb_attach_genpds(struct simplefb_par *par, struct platform_device *pdev) { @@ -622,18 +635,20 @@ static int simplefb_probe(struct platform_device *pdev) ret = devm_aperture_acquire_for_platform_device(pdev, par->base, par->size); if (ret) { dev_err(&pdev->dev, "Unable to acquire aperture: %d\n", ret); - goto error_regulators; + goto error_genpds; } ret = register_framebuffer(info); if (ret < 0) { dev_err(&pdev->dev, "Unable to register simplefb: %d\n", ret); - goto error_regulators; + goto error_genpds; } dev_info(&pdev->dev, "fb%d: simplefb registered!\n", info->node); return 0; +error_genpds: + simplefb_detach_genpds(par); error_regulators: simplefb_regulators_destroy(par); error_clocks: --- base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585 change-id: 20250901-simplefb-genpd-uaf-352704761a29 Best regards, -- Janne Grunau <j(a)jannau.net>

1 week, 4 days

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Check this out at Amazon

by llk16 9157

Purchase this ALCHIMERA ebook, and a portion of the proceeds will help children and families in need in Gaza, Ukraine, and the DRC: Your gesture is a seed of love that will bear eternal fruit. https://a.co/d/aDuLWHN 🆘Buy this book, save a life today. Every word you read, every page you turn, becomes an act of compassion. 💔 Children cry from hunger in Gaza, Ukraine, and eastern DRC. Your purchase becomes a hot meal, a blanket, a breath of hope for those who have nothing left. This isn't just an ebook. It's a mission. A portion of the funds is sent to disaster-stricken families suffering from serious hunger. 🙏 Share this message. Give this book as a gift. Increase the number of lifesaving actions. Every share is an answered prayer. Every purchase is a helping hand. May God bless you abundantly for your generous heart. This book is in your hands. Someone's life too.

1 week, 4 days

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[PATCH] ext4: fix use-after-free in extent header access

by Deepanshu Kartikey

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master syzbot reported use-after-free bugs when accessing extent headers in ext4_ext_insert_extent() and ext4_ext_correct_indexes(). These occur when the extent path structure becomes invalid during operations. The crashes show two patterns: 1. In ext4_ext_map_blocks(), the extent header can be corrupted after ext4_find_extent() returns, particularly during concurrent writes to the same file. 2. In ext4_ext_correct_indexes(), accessing path[depth] causes a use-after-free, indicating the path structure itself is corrupted. This is partially exposed by commit 665575cff098 ("filemap: move prefaulting out of hot write path") which changed timing windows in the write path, making these races more likely to occur. Fix this by adding validation checks: - In ext4_ext_map_blocks(): validate the extent header after getting the path from ext4_find_extent() - In ext4_ext_correct_indexes(): validate the path pointer before dereferencing and check extent header magic While these checks are defensive and don't address the root cause of path corruption, they prevent kernel crashes from invalid memory access. A more comprehensive fix to path lifetime management may be needed in the future. Reported-by: syzbot+9db318d6167044609878(a)syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=9db318d6167044609878 Fixes: 665575cff098 ("filemap: move prefaulting out of hot write path") Cc: stable(a)vger.kernel.org Signed-off-by: Deepanshu Kartikey <kartikey406(a)gmail.com> --- fs/ext4/extents.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index ca5499e9412b..903578d5f68d 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -1708,7 +1708,9 @@ static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode, struct ext4_extent *ex; __le32 border; int k, err = 0; - + if (!path || depth < 0 || depth > EXT4_MAX_EXTENT_DEPTH) { + return -EFSCORRUPTED; + } eh = path[depth].p_hdr; ex = path[depth].p_ext; @@ -4200,6 +4202,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, unsigned int allocated_clusters = 0; struct ext4_allocation_request ar; ext4_lblk_t cluster_offset; + struct ext4_extent_header *eh; ext_debug(inode, "blocks %u/%u requested\n", map->m_lblk, map->m_len); trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags); @@ -4212,7 +4215,12 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, } depth = ext_depth(inode); - + eh = path[depth].p_hdr; + if (!eh || le16_to_cpu(eh->eh_magic) != EXT4_EXT_MAGIC) { + EXT4_ERROR_INODE(inode, "invalid extent header after find_extent"); + err = -EFSCORRUPTED; + goto out; + } /* * consistent leaf must not be empty; * this situation is possible, though, _during_ tree modification; -- 2.43.0

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+ mm-damon-vaddr-do-not-repeat-pte_offset_map_lock-until-success.patch added to mm-hotfixes-unstable branch

by Andrew Morton

The patch titled Subject: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-damon-vaddr-do-not-repeat-pte_offset_map_lock-until-success.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patche… This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: SeongJae Park <sj(a)kernel.org> Subject: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success Date: Mon, 29 Sep 2025 17:44:09 -0700 DAMON's virtual address space operation set implementation (vaddr) calls pte_offset_map_lock() inside the page table walk callback function. This is for reading and writing page table accessed bits. If pte_offset_map_lock() fails, it retries by returning the page table walk callback function with ACTION_AGAIN. pte_offset_map_lock() can continuously fail if the target is a pmd migration entry, though. Hence it could cause an infinite page table walk if the migration cannot be done until the page table walk is finished. This indeed caused a soft lockup when CPU hotplugging and DAMON were running in parallel. Avoid the infinite loop by simply not retrying the page table walk. DAMON is promising only a best-effort accuracy, so missing access to such pages is no problem. Link: https://lkml.kernel.org/r/20250930004410.55228-1-sj@kernel.org Fixes: 7780d04046a2 ("mm/pagewalkers: ACTION_AGAIN if pte_offset_map_lock() fails") Signed-off-by: SeongJae Park <sj(a)kernel.org> Reported-by: Xinyu Zheng <zhengxinyu6(a)huawei.com> Closes: https://lore.kernel.org/20250918030029.2652607-1-zhengxinyu6@huawei.com Acked-by: Hugh Dickins <hughd(a)google.com> Cc: <stable(a)vger.kernel.org> [6.5+] Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/damon/vaddr.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) --- a/mm/damon/vaddr.c~mm-damon-vaddr-do-not-repeat-pte_offset_map_lock-until-success +++ a/mm/damon/vaddr.c @@ -328,10 +328,8 @@ static int damon_mkold_pmd_entry(pmd_t * } pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); - if (!pte) { - walk->action = ACTION_AGAIN; + if (!pte) return 0; - } if (!pte_present(ptep_get(pte))) goto out; damon_ptep_mkold(pte, walk->vma, addr); @@ -481,10 +479,8 @@ regular_page: #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); - if (!pte) { - walk->action = ACTION_AGAIN; + if (!pte) return 0; - } ptent = ptep_get(pte); if (!pte_present(ptent)) goto out; _ Patches currently in -mm which might be from sj(a)kernel.org are mm-damon-vaddr-do-not-repeat-pte_offset_map_lock-until-success.patch

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+ mm-rmap-fix-soft-dirty-and-uffd-wp-bit-loss-when-remapping-zero-filled-mthp-subpage-to-shared-zeropage.patch added to mm-hotfixes-unstable branch

by Andrew Morton

The patch titled Subject: mm/rmap: fix soft-dirty and uffd-wp bit loss when remapping zero-filled mTHP subpage to shared zeropage has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-rmap-fix-soft-dirty-and-uffd-wp-bit-loss-when-remapping-zero-filled-mthp-subpage-to-shared-zeropage.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patche… This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Lance Yang <lance.yang(a)linux.dev> Subject: mm/rmap: fix soft-dirty and uffd-wp bit loss when remapping zero-filled mTHP subpage to shared zeropage Date: Tue, 30 Sep 2025 16:10:40 +0800 When splitting an mTHP and replacing a zero-filled subpage with the shared zeropage, try_to_map_unused_to_zeropage() currently drops several important PTE bits. For userspace tools like CRIU, which rely on the soft-dirty mechanism for incremental snapshots, losing the soft-dirty bit means modified pages are missed, leading to inconsistent memory state after restore. As pointed out by David, the more critical uffd-wp bit is also dropped. This breaks the userfaultfd write-protection mechanism, causing writes to be silently missed by monitoring applications, which can lead to data corruption. Preserve both the soft-dirty and uffd-wp bits from the old PTE when creating the new zeropage mapping to ensure they are correctly tracked. Link: https://lkml.kernel.org/r/20250930081040.80926-1-lance.yang@linux.dev Fixes: b1f202060afe ("mm: remap unused subpages to shared zeropage when splitting isolated thp") Signed-off-by: Lance Yang <lance.yang(a)linux.dev> Suggested-by: David Hildenbrand <david(a)redhat.com> Suggested-by: Dev Jain <dev.jain(a)arm.com> Acked-by: David Hildenbrand <david(a)redhat.com> Reviewed-by: Dev Jain <dev.jain(a)arm.com> Acked-by: Zi Yan <ziy(a)nvidia.com> Cc: Alistair Popple <apopple(a)nvidia.com> Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com> Cc: Barry Song <baohua(a)kernel.org> Cc: Byungchul Park <byungchul(a)sk.com> Cc: Gregory Price <gourry(a)gourry.net> Cc: "Huang, Ying" <ying.huang(a)linux.alibaba.com> Cc: Jann Horn <jannh(a)google.com> Cc: Joshua Hahn <joshua.hahnjy(a)gmail.com> Cc: Liam Howlett <liam.howlett(a)oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Cc: Mariano Pache <npache(a)redhat.com> Cc: Mathew Brost <matthew.brost(a)intel.com> Cc: Peter Xu <peterx(a)redhat.com> Cc: Rakie Kim <rakie.kim(a)sk.com> Cc: Rik van Riel <riel(a)surriel.com> Cc: Ryan Roberts <ryan.roberts(a)arm.com> Cc: Usama Arif <usamaarif642(a)gmail.com> Cc: Vlastimil Babka <vbabka(a)suse.cz> Cc: Yu Zhao <yuzhao(a)google.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/migrate.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) --- a/mm/migrate.c~mm-rmap-fix-soft-dirty-and-uffd-wp-bit-loss-when-remapping-zero-filled-mthp-subpage-to-shared-zeropage +++ a/mm/migrate.c @@ -297,8 +297,7 @@ bool isolate_folio_to_list(struct folio } static bool try_to_map_unused_to_zeropage(struct page_vma_mapped_walk *pvmw, - struct folio *folio, - unsigned long idx) + struct folio *folio, pte_t old_pte, unsigned long idx) { struct page *page = folio_page(folio, idx); pte_t newpte; @@ -307,7 +306,7 @@ static bool try_to_map_unused_to_zeropag return false; VM_BUG_ON_PAGE(!PageAnon(page), page); VM_BUG_ON_PAGE(!PageLocked(page), page); - VM_BUG_ON_PAGE(pte_present(ptep_get(pvmw->pte)), page); + VM_BUG_ON_PAGE(pte_present(old_pte), page); if (folio_test_mlocked(folio) || (pvmw->vma->vm_flags & VM_LOCKED) || mm_forbids_zeropage(pvmw->vma->vm_mm)) @@ -323,6 +322,12 @@ static bool try_to_map_unused_to_zeropag newpte = pte_mkspecial(pfn_pte(my_zero_pfn(pvmw->address), pvmw->vma->vm_page_prot)); + + if (pte_swp_soft_dirty(old_pte)) + newpte = pte_mksoft_dirty(newpte); + if (pte_swp_uffd_wp(old_pte)) + newpte = pte_mkuffd_wp(newpte); + set_pte_at(pvmw->vma->vm_mm, pvmw->address, pvmw->pte, newpte); dec_mm_counter(pvmw->vma->vm_mm, mm_counter(folio)); @@ -365,13 +370,13 @@ static bool remove_migration_pte(struct continue; } #endif + old_pte = ptep_get(pvmw.pte); if (rmap_walk_arg->map_unused_to_zeropage && - try_to_map_unused_to_zeropage(&pvmw, folio, idx)) + try_to_map_unused_to_zeropage(&pvmw, folio, old_pte, idx)) continue; folio_get(folio); pte = mk_pte(new, READ_ONCE(vma->vm_page_prot)); - old_pte = ptep_get(pvmw.pte); entry = pte_to_swp_entry(old_pte); if (!is_migration_entry_young(entry)) _ Patches currently in -mm which might be from lance.yang(a)linux.dev are hung_task-fix-warnings-caused-by-unaligned-lock-pointers.patch mm-thp-fix-mte-tag-mismatch-when-replacing-zero-filled-subpages.patch mm-rmap-fix-soft-dirty-and-uffd-wp-bit-loss-when-remapping-zero-filled-mthp-subpage-to-shared-zeropage.patch mm-clean-up-is_guard_pte_marker.patch

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[PATCH] ext4: fix use-after-free in extent header access

by Deepanshu Kartikey

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master syzbot reported multiple use-after-free bugs when accessing extent headers in various ext4 functions. These occur because extent headers can be freed by concurrent operations while other threads still hold pointers to them. The issue is triggered by racing threads performing concurrent writes to the same file. After commit 665575cff098 ("filemap: move prefaulting out of hot write path"), the write path no longer prefaults pages in the hot path, creating a wider race window where: 1. Thread A calls ext4_find_extent() and gets a path with extent headers 2. Thread A's write attempt fails, entering the slow path 3. During the gap, Thread B modifies the extent tree, freeing nodes 4. Thread A continues using the now-freed extent headers, causing UAF Fix this by validating the extent header in ext4_find_extent() before returning the path. This ensures all callers receive a valid extent path, fixing the race at a single point rather than adding checks throughout the codebase. This addresses crashes in ext4_ext_insert_extent(), ext4_ext_binsearch(), and potentially other locations that use extent paths. Reported-by: syzbot+9db318d6167044609878(a)syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=9db318d6167044609878 Fixes: 665575cff098 ("filemap: move prefaulting out of hot write path") Cc: stable(a)vger.kernel.org Signed-off-by: Deepanshu Kartikey <kartikey406(a)gmail.com> --- fs/ext4/extents.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index ca5499e9412b..04ceae5b0a34 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4200,6 +4200,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, unsigned int allocated_clusters = 0; struct ext4_allocation_request ar; ext4_lblk_t cluster_offset; + struct ext4_extent_header *eh; ext_debug(inode, "blocks %u/%u requested\n", map->m_lblk, map->m_len); trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags); @@ -4212,7 +4213,12 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, } depth = ext_depth(inode); - + eh = path[depth].p_hdr; + if (!eh || le16_to_cpu(eh->eh_magic) != EXT4_EXT_MAGIC) { + EXT4_ERROR_INODE(inode, "invalid extent header after find_extent"); + err = -EFSCORRUPTED; + goto out; + } /* * consistent leaf must not be empty; * this situation is possible, though, _during_ tree modification; -- 2.43.0

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RE: Executive Assistants and HNWI Directory to Enhance Your Marketing and Networking

by Brenda Wilson

Hi , Hope you're doing well. I wanted to check if my previous email reached you. Do you need any additional information regarding my previous email? If so, I can provide it for your review. Regards Brenda Marketing Manager Prospect Tech Connect., Please reply with REMOVE if you don't wish to receive further emails -----Original Message----- From: Brenda Wilson Subject: Executive Assistants and HNWI Directory to Enhance Your Marketing and Networking Hi , Our verified database enables accurate outreach to Executive Assistants and high-net-worth individuals. Executive Assistants (by region): USA : 50,000 contacts Europe : 15,000 contacts Canada : 2,000 contacts Middle East : 2,500 contacts HNWI & Senior Decision-Makers (by region, incl. EAs): USA : 500,000 contacts Europe : 50,000 contacts Canada : 10,000 contacts UAE : 7,500 contacts Titles we cover: Business Owners, Founders, Entrepreneurs, C-Level Executives, VPs, and Executive Assistants. Data fields: Name, Job Title, Company, URL, Email, Revenue and more. This list helps reach gatekeepers and decision-makers who oversee charter service partnerships. Happy to share prices if that helps. Eager to receive your feedback. Regards Brenda Marketing Manager Prospect Tech Connect., Please reply with REMOVE if you don't wish to receive further emails

1 week, 5 days

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regression from 6.12.48 to 6.12.49: usb wlan adaptor stops working: bisected

by Wolfgang Walter

Hello,o after upgrading to 6.12.49 my wlan adapter stops working. It is detected: kernel: mt76x2u 4-2:1.0: ASIC revision: 76120044 kernel: mt76x2u 4-2:1.0: ROM patch build: 20141115060606a kernel: usb 3-4: reset high-speed USB device number 2 using xhci_hcd kernel: mt76x2u 4-2:1.0: Firmware Version: 0.0.00 kernel: mt76x2u 4-2:1.0: Build: 1 kernel: mt76x2u 4-2:1.0: Build Time: 201507311614____ but does nor work. The following 2 messages probably are relevant: kernel: mt76x2u 4-2:1.0: MAC RX failed to stop kernel: mt76x2u 4-2:1.0: MAC RX failed to stop later I see a lot of kernel: mt76x2u 4-2:1.0: error: mt76x02u_mcu_wait_resp failed with -110 I bisected it down to commit 9b28ef1e4cc07cdb35da257aa4358d0127168b68 usb: xhci: remove option to change a default ring's TRB cycle bit 9b28ef1e4cc07cdb35da257aa4358d0127168b68 is the first bad commit commit 9b28ef1e4cc07cdb35da257aa4358d0127168b68 Author: Niklas Neronin <niklas.neronin(a)linux.intel.com> Date: Wed Sep 17 08:39:07 2025 -0400 usb: xhci: remove option to change a default ring's TRB cycle bit [ Upstream commit e1b0fa863907a61e86acc19ce2d0633941907c8e ] The TRB cycle bit indicates TRB ownership by the Host Controller (HC) or Host Controller Driver (HCD). New rings are initialized with 'cycle_state' equal to one, and all its TRBs' cycle bits are set to zero. When handling ring expansion, set the source ring cycle bits to the same value as the destination ring. Move the cycle bit setting from xhci_segment_alloc() to xhci_link_rings(), and remove the 'cycle_state' argument from xhci_initialize_ring_info(). The xhci_segment_alloc() function uses kzalloc_node() to allocate segments, ensuring that all TRB cycle bits are initialized to zero. Signed-off-by: Niklas Neronin <niklas.neronin(a)linux.intel.com> Signed-off-by: Mathias Nyman <mathias.nyman(a)linux.intel.com> Link: https://lore.kernel.org/r/20241106101459.775897-12-mathias.nyman@linux.inte… Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Stable-dep-of: a5c98e8b1398 ("xhci: dbc: Fix full DbC transfer ring after several reconnects") Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Regards, -- Wolfgang Walter Studierendenwerk München Oberbayern Anstalt des öffentlichen Rechts

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[PATCH 6.1 0/6] fix invalid sleeping in detect_cache_attributes()

by Wen Yang

commit 3fcbf1c77d08 ("arch_topology: Fix cache attributes detection in the CPU hotplug path") adds a call to detect_cache_attributes() to populate the cacheinfo before updating the siblings mask. detect_cache_attributes() allocates memory and can take the PPTT mutex (on ACPI platforms). On PREEMPT_RT kernels, on secondary CPUs, this triggers a: 'BUG: sleeping function called from invalid context' as the code is executed with preemption and interrupts disabled: | BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46 | in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 0, name: swapper/111 | preempt_count: 1, expected: 0 | RCU nest depth: 1, expected: 1 | 3 locks held by swapper/111/0: | #0: (&pcp->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x218/0x12c8 | #1: (rcu_read_lock){....}-{1:3}, at: rt_spin_trylock+0x48/0xf0 | #2: (&zone->lock){+.+.}-{3:3}, at: rmqueue_bulk+0x64/0xa80 | irq event stamp: 0 | hardirqs last enabled at (0): 0x0 | hardirqs last disabled at (0): copy_process+0x5dc/0x1ab8 | softirqs last enabled at (0): copy_process+0x5dc/0x1ab8 | softirqs last disabled at (0): 0x0 | Preemption disabled at: | migrate_enable+0x30/0x130 | CPU: 111 PID: 0 Comm: swapper/111 Tainted: G W 6.0.0-rc4-rt6-[...] | Call trace: | __kmalloc+0xbc/0x1e8 | detect_cache_attributes+0x2d4/0x5f0 | update_siblings_masks+0x30/0x368 | store_cpu_topology+0x78/0xb8 | secondary_start_kernel+0xd0/0x198 | __secondary_switched+0xb0/0xb4 Pierre fixed this issue in the upstream 6.3 and the original series is follows: https://lore.kernel.org/all/167404285593.885445.6219705651301997538.b4-ty@a… We also encountered the same issue on 6.1 stable branch, and need to backport this series. Pierre Gondois (6): cacheinfo: Use RISC-V's init_cache_level() as generic OF implementation cacheinfo: Return error code in init_of_cache_level() cacheinfo: Check 'cache-unified' property to count cache leaves ACPI: PPTT: Remove acpi_find_cache_levels() ACPI: PPTT: Update acpi_find_last_cache_level() to acpi_get_cache_info() arch_topology: Build cacheinfo from primary CPU arch/arm64/kernel/cacheinfo.c | 11 ++- arch/riscv/kernel/cacheinfo.c | 42 ----------- drivers/acpi/pptt.c | 93 +++++++++++++---------- drivers/base/arch_topology.c | 12 ++- drivers/base/cacheinfo.c | 134 +++++++++++++++++++++++++++++----- include/linux/cacheinfo.h | 11 ++- 6 files changed, 196 insertions(+), 107 deletions(-) -- 2.25.1

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[PATCH 6.1] arch_topology: Build cacheinfo from primary CPU

by Wen Yang

From: Pierre Gondois <pierre.gondois(a)arm.com> commit 5944ce092b97caed5d86d961e963b883b5c44ee2 upstream. commit 3fcbf1c77d08 ("arch_topology: Fix cache attributes detection in the CPU hotplug path") adds a call to detect_cache_attributes() to populate the cacheinfo before updating the siblings mask. detect_cache_attributes() allocates memory and can take the PPTT mutex (on ACPI platforms). On PREEMPT_RT kernels, on secondary CPUs, this triggers a: 'BUG: sleeping function called from invalid context' [1] as the code is executed with preemption and interrupts disabled. The primary CPU was previously storing the cache information using the now removed (struct cpu_topology).llc_id: commit 5b8dc787ce4a ("arch_topology: Drop LLC identifier stash from the CPU topology") allocate_cache_info() tries to build the cacheinfo from the primary CPU prior secondary CPUs boot, if the DT/ACPI description contains cache information. If allocate_cache_info() fails, then fallback to the current state for the cacheinfo allocation. [1] will be triggered in such case. When unplugging a CPU, the cacheinfo memory cannot be freed. If it was, then the memory would be allocated early by the re-plugged CPU and would trigger [1]. Note that populate_cache_leaves() might be called multiple times due to populate_leaves being moved up. This is required since detect_cache_attributes() might be called with per_cpu_cacheinfo(cpu) being allocated but not populated. [1]: | BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46 | in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 0, name: swapper/111 | preempt_count: 1, expected: 0 | RCU nest depth: 1, expected: 1 | 3 locks held by swapper/111/0: | #0: (&pcp->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x218/0x12c8 | #1: (rcu_read_lock){....}-{1:3}, at: rt_spin_trylock+0x48/0xf0 | #2: (&zone->lock){+.+.}-{3:3}, at: rmqueue_bulk+0x64/0xa80 | irq event stamp: 0 | hardirqs last enabled at (0): 0x0 | hardirqs last disabled at (0): copy_process+0x5dc/0x1ab8 | softirqs last enabled at (0): copy_process+0x5dc/0x1ab8 | softirqs last disabled at (0): 0x0 | Preemption disabled at: | migrate_enable+0x30/0x130 | CPU: 111 PID: 0 Comm: swapper/111 Tainted: G W 6.0.0-rc4-rt6-[...] | Call trace: | __kmalloc+0xbc/0x1e8 | detect_cache_attributes+0x2d4/0x5f0 | update_siblings_masks+0x30/0x368 | store_cpu_topology+0x78/0xb8 | secondary_start_kernel+0xd0/0x198 | __secondary_switched+0xb0/0xb4 Signed-off-by: Pierre Gondois <pierre.gondois(a)arm.com> Reviewed-by: Sudeep Holla <sudeep.holla(a)arm.com> Acked-by: Palmer Dabbelt <palmer(a)rivosinc.com> Link: https://lore.kernel.org/r/20230104183033.755668-7-pierre.gondois@arm.com Signed-off-by: Sudeep Holla <sudeep.holla(a)arm.com> Cc: <stable(a)vger.kernel.org> # 6.1.x: c3719bd:cacheinfo: Use RISC-V's init_cache_level() as generic OF implementation Cc: <stable(a)vger.kernel.org> # 6.1.x: 8844c3d:cacheinfo: Return error code in init_of_cache_level( Cc: <stable(a)vger.kernel.org> # 6.1.x: de0df44:cacheinfo: Check 'cache-unified' property to count cache leaves Cc: <stable(a)vger.kernel.org> # 6.1.x: fa4d566:ACPI: PPTT: Remove acpi_find_cache_levels() Cc: <stable(a)vger.kernel.org> # 6.1.x: bd50036:ACPI: PPTT: Update acpi_find_last_cache_level() to acpi_get_cache_info( Cc: <stable(a)vger.kernel.org> # 6.1.x Signed-off-by: Wen Yang <wen.yang(a)linux.dev> --- arch/riscv/kernel/cacheinfo.c | 5 --- drivers/base/arch_topology.c | 12 +++++- drivers/base/cacheinfo.c | 71 ++++++++++++++++++++++++++--------- include/linux/cacheinfo.h | 1 + 4 files changed, 65 insertions(+), 24 deletions(-) diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c index 440a3df5944c..3a13113f1b29 100644 --- a/arch/riscv/kernel/cacheinfo.c +++ b/arch/riscv/kernel/cacheinfo.c @@ -113,11 +113,6 @@ static void fill_cacheinfo(struct cacheinfo **this_leaf, } } -int init_cache_level(unsigned int cpu) -{ - return init_of_cache_level(cpu); -} - int populate_cache_leaves(unsigned int cpu) { struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c index e7d6e6657ffa..b1c1dd38ab01 100644 --- a/drivers/base/arch_topology.c +++ b/drivers/base/arch_topology.c @@ -736,7 +736,7 @@ void update_siblings_masks(unsigned int cpuid) ret = detect_cache_attributes(cpuid); if (ret && ret != -ENOENT) - pr_info("Early cacheinfo failed, ret = %d\n", ret); + pr_info("Early cacheinfo allocation failed, ret = %d\n", ret); /* update core and thread sibling masks */ for_each_online_cpu(cpu) { @@ -825,7 +825,7 @@ __weak int __init parse_acpi_topology(void) #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV) void __init init_cpu_topology(void) { - int ret; + int cpu, ret; reset_cpu_topology(); ret = parse_acpi_topology(); @@ -840,6 +840,14 @@ void __init init_cpu_topology(void) reset_cpu_topology(); return; } + + for_each_possible_cpu(cpu) { + ret = fetch_cache_info(cpu); + if (ret) { + pr_err("Early cacheinfo failed, ret = %d\n", ret); + break; + } + } } void store_cpu_topology(unsigned int cpuid) diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c index ab99b0f0d010..cd943d06d074 100644 --- a/drivers/base/cacheinfo.c +++ b/drivers/base/cacheinfo.c @@ -412,10 +412,6 @@ static void free_cache_attributes(unsigned int cpu) return; cache_shared_cpu_map_remove(cpu); - - kfree(per_cpu_cacheinfo(cpu)); - per_cpu_cacheinfo(cpu) = NULL; - cache_leaves(cpu) = 0; } int __weak init_cache_level(unsigned int cpu) @@ -428,29 +424,71 @@ int __weak populate_cache_leaves(unsigned int cpu) return -ENOENT; } +static inline +int allocate_cache_info(int cpu) +{ + per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu), + sizeof(struct cacheinfo), GFP_ATOMIC); + if (!per_cpu_cacheinfo(cpu)) { + cache_leaves(cpu) = 0; + return -ENOMEM; + } + + return 0; +} + +int fetch_cache_info(unsigned int cpu) +{ + struct cpu_cacheinfo *this_cpu_ci; + unsigned int levels, split_levels; + int ret; + + if (acpi_disabled) { + ret = init_of_cache_level(cpu); + if (ret < 0) + return ret; + } else { + ret = acpi_get_cache_info(cpu, &levels, &split_levels); + if (ret < 0) + return ret; + + this_cpu_ci = get_cpu_cacheinfo(cpu); + this_cpu_ci->num_levels = levels; + /* + * This assumes that: + * - there cannot be any split caches (data/instruction) + * above a unified cache + * - data/instruction caches come by pair + */ + this_cpu_ci->num_leaves = levels + split_levels; + } + if (!cache_leaves(cpu)) + return -ENOENT; + + return allocate_cache_info(cpu); +} + int detect_cache_attributes(unsigned int cpu) { int ret; - /* Since early detection of the cacheinfo is allowed via this - * function and this also gets called as CPU hotplug callbacks via - * cacheinfo_cpu_online, the initialisation can be skipped and only - * CPU maps can be updated as the CPU online status would be update - * if called via cacheinfo_cpu_online path. + /* Since early initialization/allocation of the cacheinfo is allowed + * via fetch_cache_info() and this also gets called as CPU hotplug + * callbacks via cacheinfo_cpu_online, the init/alloc can be skipped + * as it will happen only once (the cacheinfo memory is never freed). + * Just populate the cacheinfo. */ if (per_cpu_cacheinfo(cpu)) - goto update_cpu_map; + goto populate_leaves; if (init_cache_level(cpu) || !cache_leaves(cpu)) return -ENOENT; - per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu), - sizeof(struct cacheinfo), GFP_ATOMIC); - if (per_cpu_cacheinfo(cpu) == NULL) { - cache_leaves(cpu) = 0; - return -ENOMEM; - } + ret = allocate_cache_info(cpu); + if (ret) + return ret; +populate_leaves: /* * populate_cache_leaves() may completely setup the cache leaves and * shared_cpu_map or it may leave it partially setup. @@ -459,7 +497,6 @@ int detect_cache_attributes(unsigned int cpu) if (ret) goto free_ci; -update_cpu_map: /* * For systems using DT for cache hierarchy, fw_token * and shared_cpu_map will be set up here only if they are diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h index 00d8e7f9d1c6..dfef57077cd0 100644 --- a/include/linux/cacheinfo.h +++ b/include/linux/cacheinfo.h @@ -85,6 +85,7 @@ int populate_cache_leaves(unsigned int cpu); int cache_setup_acpi(unsigned int cpu); bool last_level_cache_is_valid(unsigned int cpu); bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y); +int fetch_cache_info(unsigned int cpu); int detect_cache_attributes(unsigned int cpu); #ifndef CONFIG_ACPI_PPTT /* -- 2.25.1

1 week, 5 days

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[PATCH v5] net/can/gs_usb: increase max interface to U8_MAX

by Celeste Liu

This issue was found by Runcheng Lu when develop HSCanT USB to CAN FD converter[1]. The original developers may have only 3 interfaces device to test so they write 3 here and wait for future change. During the HSCanT development, we actually used 4 interfaces, so the limitation of 3 is not enough now. But just increase one is not future-proofed. Since the channel index type in gs_host_frame is u8, just make canch[] become a flexible array with a u8 index, so it naturally constraint by U8_MAX and avoid statically allocate 256 pointer for every gs_usb device. [1]: https://github.com/cherry-embedded/HSCanT-hardware Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices") Reported-by: Runcheng Lu <runcheng.lu(a)hpmicro.com> Cc: stable(a)vger.kernel.org Reviewed-by: Vincent Mailhol <mailhol(a)kernel.org> Signed-off-by: Celeste Liu <uwu(a)coelacanthus.name> --- Changes in v5: - Reword commit message to match the code better. - Link to v4: https://lore.kernel.org/r/20250930-gs-usb-max-if-v4-1-8e163eb583da@coelacan… Changes in v4: - Remove redudant typeof(). - Fix type: inteface -> interface. - Link to v3: https://lore.kernel.org/r/20250930-gs-usb-max-if-v3-1-21d97d7f1c34@coelacan… Changes in v3: - Cc stable should in patch instead of cover letter. - Link to v2: https://lore.kernel.org/r/20250930-gs-usb-max-if-v2-1-2cf9a44e6861@coelacan… Changes in v2: - Use flexible array member instead of fixed array. - Link to v1: https://lore.kernel.org/r/20250929-gs-usb-max-if-v1-1-e41b5c09133a@coelacan… --- drivers/net/can/usb/gs_usb.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c index c9482d6e947b0c7b033dc4f0c35f5b111e1bfd92..9fb4cbbd6d6dc88f433020eb0417ea53cd0c4d5f 100644 --- a/drivers/net/can/usb/gs_usb.c +++ b/drivers/net/can/usb/gs_usb.c @@ -289,11 +289,6 @@ struct gs_host_frame { #define GS_MAX_RX_URBS 30 #define GS_NAPI_WEIGHT 32 -/* Maximum number of interfaces the driver supports per device. - * Current hardware only supports 3 interfaces. The future may vary. - */ -#define GS_MAX_INTF 3 - struct gs_tx_context { struct gs_can *dev; unsigned int echo_id; @@ -324,7 +319,6 @@ struct gs_can { /* usb interface struct */ struct gs_usb { - struct gs_can *canch[GS_MAX_INTF]; struct usb_anchor rx_submitted; struct usb_device *udev; @@ -336,9 +330,11 @@ struct gs_usb { unsigned int hf_size_rx; u8 active_channels; + u8 channel_cnt; unsigned int pipe_in; unsigned int pipe_out; + struct gs_can *canch[] __counted_by(channel_cnt); }; /* 'allocate' a tx context. @@ -599,7 +595,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb) } /* device reports out of range channel id */ - if (hf->channel >= GS_MAX_INTF) + if (hf->channel >= parent->channel_cnt) goto device_detach; dev = parent->canch[hf->channel]; @@ -699,7 +695,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb) /* USB failure take down all interfaces */ if (rc == -ENODEV) { device_detach: - for (rc = 0; rc < GS_MAX_INTF; rc++) { + for (rc = 0; rc < parent->channel_cnt; rc++) { if (parent->canch[rc]) netif_device_detach(parent->canch[rc]->netdev); } @@ -1460,17 +1456,19 @@ static int gs_usb_probe(struct usb_interface *intf, icount = dconf.icount + 1; dev_info(&intf->dev, "Configuring for %u interfaces\n", icount); - if (icount > GS_MAX_INTF) { + if (icount > type_max(parent->channel_cnt)) { dev_err(&intf->dev, "Driver cannot handle more that %u CAN interfaces\n", - GS_MAX_INTF); + type_max(parent->channel_cnt)); return -EINVAL; } - parent = kzalloc(sizeof(*parent), GFP_KERNEL); + parent = kzalloc(struct_size(parent, canch, icount), GFP_KERNEL); if (!parent) return -ENOMEM; + parent->channel_cnt = icount; + init_usb_anchor(&parent->rx_submitted); usb_set_intfdata(intf, parent); @@ -1531,7 +1529,7 @@ static void gs_usb_disconnect(struct usb_interface *intf) return; } - for (i = 0; i < GS_MAX_INTF; i++) + for (i = 0; i < parent->channel_cnt; i++) if (parent->canch[i]) gs_destroy_candev(parent->canch[i]); --- base-commit: e5f0a698b34ed76002dc5cff3804a61c80233a7a change-id: 20250929-gs-usb-max-if-a304c83243e5 Best regards, -- Celeste Liu <uwu(a)coelacanthus.name>

1 week, 5 days

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[PATCH] net/can/gs_usb: populate net_device->dev_port

by Celeste Liu

The gs_usb driver supports USB devices with more than 1 CAN channel. In old kernel before 3.15, it uses net_device->dev_id to distinguish different channel in userspace, which was done in commit acff76fa45b4 ("can: gs_usb: gs_make_candev(): set netdev->dev_id"). But since 3.15, the correct way is populating net_device->dev_port. And according to documentation, if network device support multiple interface, lack of net_device->dev_port SHALL be treated as a bug. Fixes: acff76fa45b4 ("can: gs_usb: gs_make_candev(): set netdev->dev_id") Cc: stable(a)vger.kernel.org Signed-off-by: Celeste Liu <uwu(a)coelacanthus.name> --- drivers/net/can/usb/gs_usb.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c index c9482d6e947b0c7b033dc4f0c35f5b111e1bfd92..7ee68b47b569a142ffed3981edcaa9a1943ef0c2 100644 --- a/drivers/net/can/usb/gs_usb.c +++ b/drivers/net/can/usb/gs_usb.c @@ -1249,6 +1249,7 @@ static struct gs_can *gs_make_candev(unsigned int channel, netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */ netdev->dev_id = channel; + netdev->dev_port = channel; /* dev setup */ strcpy(dev->bt_const.name, KBUILD_MODNAME); --- base-commit: 30d4efb2f5a515a60fe6b0ca85362cbebea21e2f change-id: 20250930-gs-usb-populate-net_device-dev_port-941f2d1c3889 Best regards, -- Celeste Liu <uwu(a)coelacanthus.name>

1 week, 5 days

2
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[PATCH v2 00/13 6.1.y] Backport minmax.h updates from v6.17-rc7

by Eliav Farber

This series backports 13 patches to update minmax.h in the 6.1.y branch, aligning it with v6.17-rc7. The ultimate goal is to synchronize all longterm branches so that they include the full set of minmax.h changes (6.12.y was already aligned and 6.6.y is in progress). The key motivation is to bring in commit d03eba99f5bf ("minmax: allow min()/max()/clamp() if the arguments have the same signedness"), which is missing in older kernels. In mainline, this change enables min()/max()/clamp() to accept mixed argument types, provided both have the same signedness. Without it, backported patches that use these forms may trigger compiler warnings, which escalate to build failures when -Werror is enabled. Changes between v1 and v2: - v1 included 19 patches: https://lore.kernel.org/stable/20250924202320.32333-1-farbere@amazon.com/ - First 6 were pushed to the stable-tree. - 7th cauded amd driver's build to fail. - This change fixes it. - Modified files: drivers/gpu/drm/amd/amdgpu/amdgpu.h drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c David Laight (7): minmax.h: add whitespace around operators and after commas minmax.h: update some comments minmax.h: reduce the #define expansion of min(), max() and clamp() minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp() minmax.h: move all the clamp() definitions after the min/max() ones minmax.h: simplify the variants of clamp() minmax.h: remove some #defines that are only expanded once Linus Torvalds (6): minmax: make generic MIN() and MAX() macros available everywhere minmax: add a few more MIN_T/MAX_T users minmax: simplify min()/max()/clamp() implementation minmax: don't use max() in situations that want a C constant expression minmax: improve macro expansion and type checking minmax: fix up min3() and max3() too arch/um/drivers/mconsole_user.c | 2 + arch/x86/mm/pgtable.c | 2 +- drivers/edac/sb_edac.c | 4 +- drivers/edac/skx_common.h | 1 - drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 + .../drm/amd/display/modules/hdcp/hdcp_ddc.c | 2 + .../drm/amd/pm/powerplay/hwmgr/ppevvmath.h | 14 +- .../amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 2 + .../drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c | 3 + .../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 3 + drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +- drivers/gpu/drm/drm_color_mgmt.c | 2 +- drivers/gpu/drm/radeon/evergreen_cs.c | 2 + drivers/hwmon/adt7475.c | 24 +- drivers/input/touchscreen/cyttsp4_core.c | 2 +- drivers/irqchip/irq-sun6i-r.c | 2 +- drivers/md/dm-integrity.c | 2 +- drivers/media/dvb-frontends/stv0367_priv.h | 3 + .../net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +- drivers/net/fjes/fjes_main.c | 4 +- drivers/nfc/pn544/i2c.c | 2 - drivers/platform/x86/sony-laptop.c | 1 - drivers/scsi/isci/init.c | 6 +- .../pci/hive_isp_css_include/math_support.h | 5 - fs/btrfs/tree-checker.c | 2 +- include/linux/compiler.h | 9 + include/linux/minmax.h | 220 ++++++++++-------- kernel/trace/preemptirq_delay_test.c | 2 - lib/btree.c | 1 - lib/decompress_unlzma.c | 2 + lib/vsprintf.c | 2 +- mm/zsmalloc.c | 1 - net/ipv4/proc.c | 2 +- net/ipv6/proc.c | 2 +- tools/testing/selftests/seccomp/seccomp_bpf.c | 2 + tools/testing/selftests/vm/mremap_test.c | 2 + 36 files changed, 199 insertions(+), 142 deletions(-) -- 2.47.3

1 week, 5 days

3
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[PATCH v2 00/12 6.6.y] Backport minmax.h updates from v6.17-rc7

by Eliav Farber

This series backports 15 patches to update minmax.h in the 6.6.y branch, aligning it with v6.17-rc7. The ultimate goal is to synchronize all longterm branches so that they include the full set of minmax.h changes. The key motivation is to bring in commit d03eba99f5bf ("minmax: allow min()/max()/clamp() if the arguments have the same signedness"), which is missing in older kernels. In mainline, this change enables min()/max()/clamp() to accept mixed argument types, provided both have the same signedness. Without it, backported patches that use these forms may trigger compiler warnings, which escalate to build failures when -Werror is enabled. Changes between v1 and v2: - v1 included 15 patches: https://lore.kernel.org/stable/20250922103241.16213-1-farbere@amazon.com/T/… - First 3 were pushed to the stable-tree. - 4th cauded amd driver's build to fail. - This change fixes it. - Modified files: drivers/gpu/drm/amd/amdgpu/amdgpu.h drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c David Laight (7): minmax.h: add whitespace around operators and after commas minmax.h: update some comments minmax.h: reduce the #define expansion of min(), max() and clamp() minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp() minmax.h: move all the clamp() definitions after the min/max() ones minmax.h: simplify the variants of clamp() minmax.h: remove some #defines that are only expanded once Linus Torvalds (5): minmax: make generic MIN() and MAX() macros available everywhere minmax: simplify min()/max()/clamp() implementation minmax: don't use max() in situations that want a C constant expression minmax: improve macro expansion and type checking minmax: fix up min3() and max3() too arch/um/drivers/mconsole_user.c | 2 + drivers/edac/skx_common.h | 1 - drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 + .../drm/amd/display/modules/hdcp/hdcp_ddc.c | 2 + .../drm/amd/pm/powerplay/hwmgr/ppevvmath.h | 14 +- .../amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 2 + .../drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c | 3 + .../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 3 + drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +- drivers/gpu/drm/radeon/evergreen_cs.c | 2 + drivers/hwmon/adt7475.c | 24 +- drivers/input/touchscreen/cyttsp4_core.c | 2 +- drivers/irqchip/irq-sun6i-r.c | 2 +- drivers/media/dvb-frontends/stv0367_priv.h | 3 + .../net/can/usb/etas_es58x/es58x_devlink.c | 2 +- drivers/net/fjes/fjes_main.c | 4 +- drivers/nfc/pn544/i2c.c | 2 - drivers/platform/x86/sony-laptop.c | 1 - drivers/scsi/isci/init.c | 6 +- .../pci/hive_isp_css_include/math_support.h | 5 - fs/btrfs/tree-checker.c | 2 +- include/linux/compiler.h | 9 + include/linux/minmax.h | 220 ++++++++++-------- kernel/trace/preemptirq_delay_test.c | 2 - lib/btree.c | 1 - lib/decompress_unlzma.c | 2 + lib/vsprintf.c | 2 +- mm/zsmalloc.c | 2 - tools/testing/selftests/mm/mremap_test.c | 2 + tools/testing/selftests/seccomp/seccomp_bpf.c | 2 + 30 files changed, 192 insertions(+), 136 deletions(-) -- 2.47.3

1 week, 5 days

2
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[PATCH] Revert "usb: xhci: remove option to change a default ring's TRB cycle bit"

by Niklas Neronin

Revert 9b28ef1e4cc0 [ Upstream commit e1b0fa863907 ], it causes regression in 6.12.49 stable, no issues in upstream. Commit 9b28ef1e4cc0 ("usb: xhci: remove option to change a default ring's TRB cycle bit") introduced a regression in 6.12.49 stable kernel. The original commit was never intended for stable kernels, but was added as a dependency for commit a5c98e8b1398 ("xhci: dbc: Fix full DbC transfer ring after several reconnects"). Since this commit is more of an optimization, revert it and solve the dependecy by modifying one line in xhci_dbc_ring_init(). Specifically, commit a5c98e8b1398 ("xhci: dbc: Fix full DbC transfer ring after several reconnects") moved function call xhci_initialize_ring_info() into a separate function. To resolve the dependency, the arguments for this function call are also reverted. Closes: https://lore.kernel.org/stable/01b8c8de46251cfaad1329a46b7e3738@stwm.de/ Tested-by: Wolfgang Walter <linux(a)stwm.de> Cc: stable(a)vger.kernel.org # v6.12.49 Signed-off-by: Niklas Neronin <niklas.neronin(a)linux.intel.com> --- drivers/usb/host/xhci-dbgcap.c | 2 +- drivers/usb/host/xhci-mem.c | 50 ++++++++++++++++++---------------- drivers/usb/host/xhci.c | 2 +- drivers/usb/host/xhci.h | 6 ++-- 4 files changed, 33 insertions(+), 27 deletions(-) diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c index 1fcc9348dd43..123506681ef0 100644 --- a/drivers/usb/host/xhci-dbgcap.c +++ b/drivers/usb/host/xhci-dbgcap.c @@ -458,7 +458,7 @@ static void xhci_dbc_ring_init(struct xhci_ring *ring) trb->link.segment_ptr = cpu_to_le64(ring->first_seg->dma); trb->link.control = cpu_to_le32(LINK_TOGGLE | TRB_TYPE(TRB_LINK)); } - xhci_initialize_ring_info(ring); + xhci_initialize_ring_info(ring, 1); } static int xhci_dbc_reinit_ep_rings(struct xhci_dbc *dbc) diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index c9694526b157..f0ed38da6a0c 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -27,12 +27,14 @@ * "All components of all Command and Transfer TRBs shall be initialized to '0'" */ static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci, + unsigned int cycle_state, unsigned int max_packet, unsigned int num, gfp_t flags) { struct xhci_segment *seg; dma_addr_t dma; + int i; struct device *dev = xhci_to_hcd(xhci)->self.sysdev; seg = kzalloc_node(sizeof(*seg), flags, dev_to_node(dev)); @@ -54,6 +56,11 @@ static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci, return NULL; } } + /* If the cycle state is 0, set the cycle bit to 1 for all the TRBs */ + if (cycle_state == 0) { + for (i = 0; i < TRBS_PER_SEGMENT; i++) + seg->trbs[i].link.control = cpu_to_le32(TRB_CYCLE); + } seg->num = num; seg->dma = dma; seg->next = NULL; @@ -131,14 +138,6 @@ static void xhci_link_rings(struct xhci_hcd *xhci, struct xhci_ring *ring, chain_links = xhci_link_chain_quirk(xhci, ring->type); - /* If the cycle state is 0, set the cycle bit to 1 for all the TRBs */ - if (ring->cycle_state == 0) { - xhci_for_each_ring_seg(ring->first_seg, seg) { - for (int i = 0; i < TRBS_PER_SEGMENT; i++) - seg->trbs[i].link.control |= cpu_to_le32(TRB_CYCLE); - } - } - next = ring->enq_seg->next; xhci_link_segments(ring->enq_seg, first, ring->type, chain_links); xhci_link_segments(last, next, ring->type, chain_links); @@ -288,7 +287,8 @@ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring) kfree(ring); } -void xhci_initialize_ring_info(struct xhci_ring *ring) +void xhci_initialize_ring_info(struct xhci_ring *ring, + unsigned int cycle_state) { /* The ring is empty, so the enqueue pointer == dequeue pointer */ ring->enqueue = ring->first_seg->trbs; @@ -302,7 +302,7 @@ void xhci_initialize_ring_info(struct xhci_ring *ring) * New rings are initialized with cycle state equal to 1; if we are * handling ring expansion, set the cycle state equal to the old ring. */ - ring->cycle_state = 1; + ring->cycle_state = cycle_state; /* * Each segment has a link TRB, and leave an extra TRB for SW @@ -317,6 +317,7 @@ static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci, struct xhci_segment **first, struct xhci_segment **last, unsigned int num_segs, + unsigned int cycle_state, enum xhci_ring_type type, unsigned int max_packet, gfp_t flags) @@ -327,7 +328,7 @@ static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci, chain_links = xhci_link_chain_quirk(xhci, type); - prev = xhci_segment_alloc(xhci, max_packet, num, flags); + prev = xhci_segment_alloc(xhci, cycle_state, max_packet, num, flags); if (!prev) return -ENOMEM; num++; @@ -336,7 +337,8 @@ static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci, while (num < num_segs) { struct xhci_segment *next; - next = xhci_segment_alloc(xhci, max_packet, num, flags); + next = xhci_segment_alloc(xhci, cycle_state, max_packet, num, + flags); if (!next) goto free_segments; @@ -361,8 +363,9 @@ static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci, * Set the end flag and the cycle toggle bit on the last segment. * See section 4.9.1 and figures 15 and 16. */ -struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci, unsigned int num_segs, - enum xhci_ring_type type, unsigned int max_packet, gfp_t flags) +struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci, + unsigned int num_segs, unsigned int cycle_state, + enum xhci_ring_type type, unsigned int max_packet, gfp_t flags) { struct xhci_ring *ring; int ret; @@ -380,7 +383,7 @@ struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci, unsigned int num_segs, return ring; ret = xhci_alloc_segments_for_ring(xhci, &ring->first_seg, &ring->last_seg, num_segs, - type, max_packet, flags); + cycle_state, type, max_packet, flags); if (ret) goto fail; @@ -390,7 +393,7 @@ struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci, unsigned int num_segs, ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |= cpu_to_le32(LINK_TOGGLE); } - xhci_initialize_ring_info(ring); + xhci_initialize_ring_info(ring, cycle_state); trace_xhci_ring_alloc(ring); return ring; @@ -418,8 +421,8 @@ int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring, struct xhci_segment *last; int ret; - ret = xhci_alloc_segments_for_ring(xhci, &first, &last, num_new_segs, ring->type, - ring->bounce_buf_len, flags); + ret = xhci_alloc_segments_for_ring(xhci, &first, &last, num_new_segs, ring->cycle_state, + ring->type, ring->bounce_buf_len, flags); if (ret) return -ENOMEM; @@ -629,7 +632,8 @@ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci, for (cur_stream = 1; cur_stream < num_streams; cur_stream++) { stream_info->stream_rings[cur_stream] = - xhci_ring_alloc(xhci, 2, TYPE_STREAM, max_packet, mem_flags); + xhci_ring_alloc(xhci, 2, 1, TYPE_STREAM, max_packet, + mem_flags); cur_ring = stream_info->stream_rings[cur_stream]; if (!cur_ring) goto cleanup_rings; @@ -970,7 +974,7 @@ int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id, } /* Allocate endpoint 0 ring */ - dev->eps[0].ring = xhci_ring_alloc(xhci, 2, TYPE_CTRL, 0, flags); + dev->eps[0].ring = xhci_ring_alloc(xhci, 2, 1, TYPE_CTRL, 0, flags); if (!dev->eps[0].ring) goto fail; @@ -1453,7 +1457,7 @@ int xhci_endpoint_init(struct xhci_hcd *xhci, /* Set up the endpoint ring */ virt_dev->eps[ep_index].new_ring = - xhci_ring_alloc(xhci, 2, ring_type, max_packet, mem_flags); + xhci_ring_alloc(xhci, 2, 1, ring_type, max_packet, mem_flags); if (!virt_dev->eps[ep_index].new_ring) return -ENOMEM; @@ -2262,7 +2266,7 @@ xhci_alloc_interrupter(struct xhci_hcd *xhci, unsigned int segs, gfp_t flags) if (!ir) return NULL; - ir->event_ring = xhci_ring_alloc(xhci, segs, TYPE_EVENT, 0, flags); + ir->event_ring = xhci_ring_alloc(xhci, segs, 1, TYPE_EVENT, 0, flags); if (!ir->event_ring) { xhci_warn(xhci, "Failed to allocate interrupter event ring\n"); kfree(ir); @@ -2468,7 +2472,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) goto fail; /* Set up the command ring to have one segments for now. */ - xhci->cmd_ring = xhci_ring_alloc(xhci, 1, TYPE_COMMAND, 0, flags); + xhci->cmd_ring = xhci_ring_alloc(xhci, 1, 1, TYPE_COMMAND, 0, flags); if (!xhci->cmd_ring) goto fail; xhci_dbg_trace(xhci, trace_xhci_dbg_init, diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 3970ec831b8c..abbf89e82d01 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -769,7 +769,7 @@ static void xhci_clear_command_ring(struct xhci_hcd *xhci) seg->trbs[TRBS_PER_SEGMENT - 1].link.control &= cpu_to_le32(~TRB_CYCLE); } - xhci_initialize_ring_info(ring); + xhci_initialize_ring_info(ring, 1); /* * Reset the hardware dequeue pointer. * Yes, this will need to be re-written after resume, but we're paranoid diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index b2aeb444daaf..b4fa8e7e4376 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1803,12 +1803,14 @@ void xhci_slot_copy(struct xhci_hcd *xhci, int xhci_endpoint_init(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_device *udev, struct usb_host_endpoint *ep, gfp_t mem_flags); -struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci, unsigned int num_segs, +struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci, + unsigned int num_segs, unsigned int cycle_state, enum xhci_ring_type type, unsigned int max_packet, gfp_t flags); void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring); int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring, unsigned int num_trbs, gfp_t flags); -void xhci_initialize_ring_info(struct xhci_ring *ring); +void xhci_initialize_ring_info(struct xhci_ring *ring, + unsigned int cycle_state); void xhci_free_endpoint_ring(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, unsigned int ep_index); -- 2.50.1

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[PATCH] mm/ksm: fix flag-dropping behavior in ksm_madvise

by Jakub Acs

syzkaller discovered the following crash: (kernel BUG) [ 44.607039] ------------[ cut here ]------------ [ 44.607422] kernel BUG at mm/userfaultfd.c:2067! [ 44.608148] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI [ 44.608814] CPU: 1 UID: 0 PID: 2475 Comm: reproducer Not tainted 6.16.0-rc6 #1 PREEMPT(none) [ 44.609635] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 44.610695] RIP: 0010:userfaultfd_release_all+0x3a8/0x460 <snip other registers, drop unreliable trace> [ 44.617726] Call Trace: [ 44.617926] <TASK> [ 44.619284] userfaultfd_release+0xef/0x1b0 [ 44.620976] __fput+0x3f9/0xb60 [ 44.621240] fput_close_sync+0x110/0x210 [ 44.622222] __x64_sys_close+0x8f/0x120 [ 44.622530] do_syscall_64+0x5b/0x2f0 [ 44.622840] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 44.623244] RIP: 0033:0x7f365bb3f227 Kernel panics because it detects UFFD inconsistency during userfaultfd_release_all(). Specifically, a VMA which has a valid pointer to vma->vm_userfaultfd_ctx, but no UFFD flags in vma->vm_flags. The inconsistency is caused in ksm_madvise(): when user calls madvise() with MADV_UNMEARGEABLE on a VMA that is registered for UFFD in MINOR mode, it accidentally clears all flags stored in the upper 32 bits of vma->vm_flags. Assuming x86_64 kernel build, unsigned long is 64-bit and unsigned int and int are 32-bit wide. This setup causes the following mishap during the &= ~VM_MERGEABLE assignment. VM_MERGEABLE is a 32-bit constant of type unsigned int, 0x8000'0000. After ~ is applied, it becomes 0x7fff'ffff unsigned int, which is then promoted to unsigned long before the & operation. This promotion fills upper 32 bits with leading 0s, as we're doing unsigned conversion (and even for a signed conversion, this wouldn't help as the leading bit is 0). & operation thus ends up AND-ing vm_flags with 0x0000'0000'7fff'ffff instead of intended 0xffff'ffff'7fff'ffff and hence accidentally clears the upper 32-bits of its value. Fix it by casting `VM_MERGEABLE` constant to unsigned long to preserve the upper 32 bits, in case it's needed. Note: other VM_* flags are not affected: This only happens to the VM_MERGEABLE flag, as the other VM_* flags are all constants of type int and after ~ operation, they end up with leading 1 and are thus converted to unsigned long with leading 1s. Note 2: After commit 31defc3b01d9 ("userfaultfd: remove (VM_)BUG_ON()s"), this is no longer a kernel BUG, but a WARNING at the same place: [ 45.595973] WARNING: CPU: 1 PID: 2474 at mm/userfaultfd.c:2067 but the root-cause (flag-drop) remains the same. Fixes: 7677f7fd8be76 ("userfaultfd: add minor fault registration mode") Signed-off-by: Jakub Acs <acsjakub(a)amazon.de> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: David Hildenbrand <david(a)redhat.com> Cc: Xu Xin <xu.xin16(a)zte.com.cn> Cc: Chengming Zhou <chengming.zhou(a)linux.dev> Cc: Peter Xu <peterx(a)redhat.com> Cc: Axel Rasmussen <axelrasmussen(a)google.com> Cc: Mike Kravetz <mike.kravetz(a)oracle.com> Cc: linux-mm(a)kvack.org Cc: linux-kernel(a)vger.kernel.org Cc: stable(a)vger.kernel.org --- I looked around the kernel and found one more flag that might be causing similar issues: "IORESOURCE_BUSY" - as its inverted version is bit-anded to unsigned long fields. However, it seems those fields don't actually use any bits from upper 32-bits as flags (yet?). I also considered changing the constant definition by adding ULL, but am not sure where else that could blow up, plus it would likely call to define all the related constants as ULL for consistency. If you'd prefer that fix, let me know. mm/ksm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/ksm.c b/mm/ksm.c index 160787bb121c..c24137a1eeb7 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -2871,7 +2871,7 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start, return err; } - *vm_flags &= ~VM_MERGEABLE; + *vm_flags &= ~((unsigned long) VM_MERGEABLE); break; } -- 2.47.3 Amazon Web Services Development Center Germany GmbH Tamara-Danz-Str. 13 10243 Berlin Geschaeftsfuehrung: Christian Schlaeger Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B Sitz: Berlin Ust-ID: DE 365 538 597

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