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[PATCH 0/3] rust_binder: fix unsoundness due to combining List::remove with mem:take

by Alice Ryhl

See the first patch for details on the bug. Signed-off-by: Alice Ryhl <aliceryhl(a)google.com> --- Alice Ryhl (3): rust_binder: fix race condition on death_list rust_binder: avoid mem::take on delivered_deaths rust: list: add warning to List::remove docs about mem::take drivers/android/binder/node.rs | 6 +++--- drivers/android/binder/process.rs | 8 ++++++-- rust/kernel/list.rs | 3 +++ 3 files changed, 12 insertions(+), 5 deletions(-) --- base-commit: 211ddde0823f1442e4ad052a2f30f050145ccada change-id: 20251111-binder-fix-list-remove-41c29c75ffc9 Best regards, -- Alice Ryhl <aliceryhl(a)google.com>

1 week, 5 days

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[PATCH] mm, swap: fix potential UAF issue for VMA readahead

by Kairui Song

From: Kairui Song <kasong(a)tencent.com> Since commit 78524b05f1a3 ("mm, swap: avoid redundant swap device pinning"), the common helper for allocating and preparing a folio in the swap cache layer no longer tries to get a swap device reference internally, because all callers of __read_swap_cache_async are already holding a swap entry reference. The repeated swap device pinning isn't needed on the same swap device. Caller of VMA readahead is also holding a reference to the target entry's swap device, but VMA readahead walks the page table, so it might encounter swap entries from other devices, and call __read_swap_cache_async on another device without holding a reference to it. So it is possible to cause a UAF when swapoff of device A raced with swapin on device B, and VMA readahead tries to read swap entries from device A. It's not easy to trigger, but in theory, it could cause real issues. Make VMA readahead try to get the device reference first if the swap device is a different one from the target entry. Cc: stable(a)vger.kernel.org Fixes: 78524b05f1a3 ("mm, swap: avoid redundant swap device pinning") Suggested-by: Huang Ying <ying.huang(a)linux.alibaba.com> Signed-off-by: Kairui Song <kasong(a)tencent.com> --- Sending as a new patch instead of V2 because the approach is very different. Previous patch: https://lore.kernel.org/linux-mm/20251110-revert-78524b05f1a3-v1-1-88313f2b… --- mm/swap_state.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/swap_state.c b/mm/swap_state.c index 0cf9853a9232..da0481e163a4 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -745,6 +745,7 @@ static struct folio *swap_vma_readahead(swp_entry_t targ_entry, gfp_t gfp_mask, blk_start_plug(&plug); for (addr = start; addr < end; ilx++, addr += PAGE_SIZE) { + struct swap_info_struct *si = NULL; softleaf_t entry; if (!pte++) { @@ -759,8 +760,19 @@ static struct folio *swap_vma_readahead(swp_entry_t targ_entry, gfp_t gfp_mask, continue; pte_unmap(pte); pte = NULL; + /* + * Readahead entry may come from a device that we are not + * holding a reference to, try to grab a reference, or skip. + */ + if (swp_type(entry) != swp_type(targ_entry)) { + si = get_swap_device(entry); + if (!si) + continue; + } folio = __read_swap_cache_async(entry, gfp_mask, mpol, ilx, &page_allocated, false); + if (si) + put_swap_device(si); if (!folio) continue; if (page_allocated) { --- base-commit: 565d240810a6c9689817a9f3d08f80adf488ca59 change-id: 20251111-swap-fix-vma-uaf-bec70969250f Best regards, -- Kairui Song <kasong(a)tencent.com>

1 week, 5 days

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[PATCH net v1 1/1] net: dsa: microchip: lan937x: Fix RGMII delay tuning

by Oleksij Rempel

Correct RGMII delay application logic in lan937x_set_tune_adj(). The function was missing `data16 &= ~PORT_TUNE_ADJ` before setting the new delay value. This caused the new value to be bitwise-OR'd with the existing PORT_TUNE_ADJ field instead of replacing it. For example, when setting the RGMII 2 TX delay on port 4, the intended TUNE_ADJUST value of 0 (RGMII_2_TX_DELAY_2NS) was incorrectly OR'd with the default 0x1B (from register value 0xDA3), leaving the delay at the wrong setting. This patch adds the missing mask to clear the field, ensuring the correct delay value is written. Physical measurements on the RGMII TX lines confirm the fix, showing the delay changing from ~1ns (before change) to ~2ns. While testing on i.MX 8MP showed this was within the platform's timing tolerance, it did not match the intended hardware-characterized value. Fixes: b19ac41faa3f ("net: dsa: microchip: apply rgmii tx and rx delay in phylink mac config") Signed-off-by: Oleksij Rempel <o.rempel(a)pengutronix.de> --- drivers/net/dsa/microchip/lan937x_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c index b1ae3b9de3d1..5a1496fff445 100644 --- a/drivers/net/dsa/microchip/lan937x_main.c +++ b/drivers/net/dsa/microchip/lan937x_main.c @@ -540,6 +540,7 @@ static void lan937x_set_tune_adj(struct ksz_device *dev, int port, ksz_pread16(dev, port, reg, &data16); /* Update tune Adjust */ + data16 &= ~PORT_TUNE_ADJ; data16 |= FIELD_PREP(PORT_TUNE_ADJ, val); ksz_pwrite16(dev, port, reg, data16); -- 2.47.3

1 week, 5 days

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by Linux Support Mail

1 week, 5 days

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[PATCH v2] intel_th: Fix error handling in intel_th_output_open

by Ma Ke

intel_th_output_open() calls bus_find_device_by_devt() which internally increments the device reference count via get_device(), but this reference is not properly released in several error paths. When device driver is unavailable, file operations cannot be obtained, or the driver's open method fails, the function returns without calling put_device(), leading to a permanent device reference count leak. This prevents the device from being properly released and could cause resource exhaustion over time. Found by code review. Cc: stable(a)vger.kernel.org Fixes: 39f4034693b7 ("intel_th: Add driver infrastructure for Intel(R) Trace Hub devices") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- Changes in v2: - modified the patch to fix uninitialized variable 'err' warnings. --- drivers/hwtracing/intel_th/core.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index 47d9e6c3bac0..fdb9d022d875 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -810,13 +810,17 @@ static int intel_th_output_open(struct inode *inode, struct file *file) int err; dev = bus_find_device_by_devt(&intel_th_bus, inode->i_rdev); - if (!dev || !dev->driver) - return -ENODEV; + if (!dev || !dev->driver) { + err = -ENODEV; + goto out_no_device; + } thdrv = to_intel_th_driver(dev->driver); fops = fops_get(thdrv->fops); - if (!fops) - return -ENODEV; + if (!fops) { + err = -ENODEV; + goto out_put_device; + } replace_fops(file, fops); @@ -824,10 +828,16 @@ static int intel_th_output_open(struct inode *inode, struct file *file) if (file->f_op->open) { err = file->f_op->open(inode, file); - return err; + if (err) + goto out_put_device; } return 0; + +out_put_device: + put_device(dev); +out_no_device: + return err; } static const struct file_operations intel_th_output_fops = { -- 2.17.1

1 week, 5 days

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[PATCH v2 0/2] Enable 1GHz OPP am335x-bonegreen-eco

by Kory Maincent (TI.com)

The vdd_mpu regulator maximum voltage was previously limited to 1.2985V, which prevented the CPU from reaching the 1GHz operating point. This limitation was put in place because voltage changes were not working correctly, causing the board to stall when attempting higher frequencies. Increase the maximum voltage to 1.3515V to allow the full 1GHz OPP to be used. Add a TPS65219 PMIC driver fixes that properly implement the LOCK register handling, to make voltage transitions work reliably. Changes in v2: - Setup a custom regmap_bus only for the TPS65214 instead of checking the chip_id every time reg_write is called. - Add the am335x-bonegreen-eco devicetree change in the same patch series. Signed-off-by: Kory Maincent (TI.com) <kory.maincent(a)bootlin.com> --- Kory Maincent (TI.com) (2): mfd: tps65219: Implement LOCK register handling for TPS65214 ARM: dts: am335x-bonegreen-eco: Enable 1GHz OPP by increasing vdd_mpu voltage arch/arm/boot/dts/ti/omap/am335x-bonegreen-eco.dts | 2 +- drivers/mfd/tps65219.c | 51 +++++++++++++++++++++- include/linux/mfd/tps65219.h | 2 + 3 files changed, 53 insertions(+), 2 deletions(-) --- base-commit: 1c353dc8d962de652bc7ad2ba2e63f553331391c change-id: 20251106-fix_tps65219-dd62141d22cf Best regards, -- Köry Maincent, Bootlin Embedded Linux and kernel engineering https://bootlin.com

1 week, 5 days

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[PATCH v3] PCI: dw-rockchip: Prevent advertising L1 Substates support

by Niklas Cassel

The L1 substates support requires additional steps to work, namely: -Proper handling of the CLKREQ# sideband signal. (It is mostly handled by hardware, but software still needs to set the clkreq fields in the PCIE_CLIENT_POWER_CON register to match the hardware implementation.) -Program the frequency of the aux clock into the DSP_PCIE_PL_AUX_CLK_FREQ_OFF register. (During L1 substates the core_clk is turned off and the aux_clk is used instead.) These steps are currently missing from the driver. For more details, see section '18.6.6.4 L1 Substate' in the RK3658 TRM 1.1 Part 2, or section '11.6.6.4 L1 Substate' in the RK3588 TRM 1.0 Part2. While this has always been a problem when using e.g. CONFIG_PCIEASPM_POWER_SUPERSAVE=y, or when modifying /sys/bus/pci/devices/.../link/l1_2_aspm, the lacking driver support for L1 substates became more apparent after commit f3ac2ff14834 ("PCI/ASPM: Enable all ClockPM and ASPM states for devicetree platforms"), which enabled ASPM also for CONFIG_PCIEASPM_DEFAULT=y. When using e.g. an NVMe drive connected to the PCIe controller, the problem will be seen as: nvme nvme0: controller is down; will reset: CSTS=0xffffffff, PCI_STATUS=0x10 nvme nvme0: Does your device have a faulty power saving mode enabled? nvme nvme0: Try "nvme_core.default_ps_max_latency_us=0 pcie_aspm=off pcie_port_pm=off" and report a bug Thus, prevent advertising L1 Substates support until proper driver support is added. Cc: stable(a)vger.kernel.org Fixes: 0e898eb8df4e ("PCI: rockchip-dwc: Add Rockchip RK356X host controller driver") Fixes: f3ac2ff14834 ("PCI/ASPM: Enable all ClockPM and ASPM states for devicetree platforms") Acked-by: Shawn Lin <shawn.lin(a)rock-chips.com> Signed-off-by: Niklas Cassel <cassel(a)kernel.org> --- Changes since v2: -Improve commit message (Bjorn) drivers/pci/controller/dwc/pcie-dw-rockchip.c | 21 +++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c index 3e2752c7dd09..84f882abbca5 100644 --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c @@ -200,6 +200,25 @@ static bool rockchip_pcie_link_up(struct dw_pcie *pci) return FIELD_GET(PCIE_LINKUP_MASK, val) == PCIE_LINKUP; } +/* + * See e.g. section '11.6.6.4 L1 Substate' in the RK3588 TRM V1.0 for the steps + * needed to support L1 substates. Currently, not a single rockchip platform + * performs these steps, so disable L1 substates until there is proper support. + */ +static void rockchip_pcie_disable_l1sub(struct dw_pcie *pci) +{ + u32 cap, l1subcap; + + cap = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_L1SS); + if (cap) { + l1subcap = dw_pcie_readl_dbi(pci, cap + PCI_L1SS_CAP); + l1subcap &= ~(PCI_L1SS_CAP_L1_PM_SS | PCI_L1SS_CAP_ASPM_L1_1 | + PCI_L1SS_CAP_ASPM_L1_2 | PCI_L1SS_CAP_PCIPM_L1_1 | + PCI_L1SS_CAP_PCIPM_L1_2); + dw_pcie_writel_dbi(pci, cap + PCI_L1SS_CAP, l1subcap); + } +} + static void rockchip_pcie_enable_l0s(struct dw_pcie *pci) { u32 cap, lnkcap; @@ -264,6 +283,7 @@ static int rockchip_pcie_host_init(struct dw_pcie_rp *pp) irq_set_chained_handler_and_data(irq, rockchip_pcie_intx_handler, rockchip); + rockchip_pcie_disable_l1sub(pci); rockchip_pcie_enable_l0s(pci); return 0; @@ -301,6 +321,7 @@ static void rockchip_pcie_ep_init(struct dw_pcie_ep *ep) struct dw_pcie *pci = to_dw_pcie_from_ep(ep); enum pci_barno bar; + rockchip_pcie_disable_l1sub(pci); rockchip_pcie_enable_l0s(pci); rockchip_pcie_ep_hide_broken_ats_cap_rk3588(ep); -- 2.51.0

1 week, 5 days

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[PATCH stable] fbdev: Fix out-of-bounds issue in sys_fillrect()

by Gu Bowen

There was an out-of-bounds issue found by syzkaller test on v6.6. BUG: unable to handle page fault for address: ffffc90000c3f000 PGD 100000067 P4D 100000067 PUD 100c80067 PMD 10ac1c067 PTE 0 Oops: 0002 [#1] PREEMPT SMP KASAN PTI CPU: 3 PID: 6521 Comm: syz.3.1365 Not tainted 6.6.0+ #82 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:memset64 arch/x86/include/asm/string_64.h:58 [inline] RIP: 0010:memset_l include/linux/string.h:168 [inline] RIP: 0010:bitfill_aligned drivers/video/fbdev/core/sysfillrect.c:53 [inline] RIP: 0010:bitfill_aligned+0x144/0x1c0 drivers/video/fbdev/core/sysfillrect.c:25 Code: 23 04 24 48 31 d0 49 89 46 f8 44 89 e0 44 29 f8 29 c3 e8 9f 39 49 fe 89 d8 31 d2 4c 89 f7 41 f7 f4 48 89 c3 48 89 c1 48 89 e8 <f3> 48 ab 31 ff 4c 89 ee e8 df 2f 49 fe 4d 85 ed 0f 84 6b ff ff ff RSP: 0018:ffff888119ce7418 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000180 RCX: 0000000000000180 RDX: 0000000000000000 RSI: ffffc90003873000 RDI: ffffc90000c3f000 RBP: 0000000000000000 R08: 0000000000006000 R09: 0000000000000040 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000040 R13: 0000000000000000 R14: ffffc90000c3f000 R15: 0000000000000000 FS: 00007f1704b926c0(0000) GS:ffff8881f5980000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90000c3f000 CR3: 00000001230d0002 CR4: 0000000000770ee0 DR0: 0000000000000000 DR1: 000000000000e000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 PKRU: 80000000 Call Trace: <TASK> sys_fillrect+0x429/0x830 drivers/video/fbdev/core/sysfillrect.c:281 drm_fbdev_generic_defio_fillrect+0x27/0x140 drivers/gpu/drm/drm_fbdev_generic.c:37 bit_clear+0x183/0x220 drivers/video/fbdev/core/bitblit.c:73 __fbcon_clear+0x5ea/0x670 drivers/video/fbdev/core/fbcon.c:1281 fbcon_scroll+0x41e/0x560 drivers/video/fbdev/core/fbcon.c:1847 con_scroll+0x464/0x6a0 drivers/tty/vt/vt.c:577 lf+0x274/0x2d0 drivers/tty/vt/vt.c:1461 do_con_trol+0x5ea/0x3d80 drivers/tty/vt/vt.c:2149 do_con_write+0x780/0x10c0 drivers/tty/vt/vt.c:2905 con_write+0x28/0xc0 drivers/tty/vt/vt.c:3245 do_output_char+0x5de/0x850 drivers/tty/n_tty.c:433 process_output drivers/tty/n_tty.c:500 [inline] n_tty_write+0x442/0xb00 drivers/tty/n_tty.c:2406 iterate_tty_write+0x2b5/0x630 drivers/tty/tty_io.c:1017 file_tty_write.constprop.0+0x20c/0x3b0 drivers/tty/tty_io.c:1088 call_write_iter include/linux/fs.h:2085 [inline] do_iter_readv_writev+0x210/0x3c0 fs/read_write.c:737 do_iter_write+0x181/0x4e0 fs/read_write.c:862 vfs_writev+0x15b/0x4d0 fs/read_write.c:935 do_writev+0x136/0x370 fs/read_write.c:978 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x59/0x110 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x78/0xe2 When the virtual console is rotated in the backend state, it can lead to inconsistencies between the size of the virtual console's size and its hook functions. In such cases, clearing the screen may result in out-of-bounds issue. Fix it by adding a check in sys_fillrect() and moving set_blitting_type() to the visible area of the VC. CC: stable(a)vger.kernel.org # fbdev had been refactored on 6.15-rc1 Fixes: 68648ed1f58d ("fbdev: add drawing functions for framebuffers in system RAM") Signed-off-by: Gu Bowen <gubowen5(a)huawei.com> --- drivers/video/fbdev/core/fbcon.c | 2 +- drivers/video/fbdev/core/sysfillrect.c | 6 ++++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index b49f15a3442e..a6602f230089 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -2702,9 +2702,9 @@ static void fbcon_modechanged(struct fb_info *info) return; p = &fb_display[vc->vc_num]; - set_blitting_type(vc, info); if (con_is_visible(vc)) { + set_blitting_type(vc, info); var_to_display(p, &info->var, info); cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres); rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres); diff --git a/drivers/video/fbdev/core/sysfillrect.c b/drivers/video/fbdev/core/sysfillrect.c index bcdcaeae6538..e5c4ee317b0b 100644 --- a/drivers/video/fbdev/core/sysfillrect.c +++ b/drivers/video/fbdev/core/sysfillrect.c @@ -238,6 +238,7 @@ void sys_fillrect(struct fb_info *p, const struct fb_fillrect *rect) u32 bpp = p->var.bits_per_pixel; unsigned long *dst; int dst_idx, left; + long dst_offset; if (p->state != FBINFO_STATE_RUNNING) return; @@ -277,6 +278,11 @@ void sys_fillrect(struct fb_info *p, const struct fb_fillrect *rect) } while (height--) { dst += dst_idx >> (ffs(bits) - 1); + dst_offset = (unsigned long)dst - (unsigned long)p->screen_base; + if (dst_offset < 0 || dst_offset >= p->fix.smem_len) { + pr_err("dst offset out of bound: dst_offset(%ld)", dst_offset); + return; + } dst_idx &= (bits - 1); fill_op32(p, dst, dst_idx, pat, width*bpp, bits); dst_idx += p->fix.line_length*8; -- 2.43.0

1 week, 5 days

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[PATCH] net: Fix error handling in netdev_register_kobject

by Ma Ke

After calling device_initialize(), the reference count of the device is set to 1. If device_add() fails or register_queue_kobjects() fails, the function returns without calling put_device() to release the initial reference, causing a memory leak of the device structure. Similarly, in netdev_unregister_kobject(), after calling device_del(), there is no call to put_device() to release the initial reference, leading to a memory leak. Add put_device() in the error paths of netdev_register_kobject() and after device_del() in netdev_unregister_kobject() to properly release the device references. Found by code review. Cc: stable(a)vger.kernel.org Fixes: a1b3f594dc5f ("net: Expose all network devices in a namespaces in sysfs") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- net/core/net-sysfs.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index ca878525ad7c..d3895f26a0c8 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -2327,6 +2327,7 @@ void netdev_unregister_kobject(struct net_device *ndev) pm_runtime_set_memalloc_noio(dev, false); device_del(dev); + put_device(dev); } /* Create sysfs entries for network device. */ @@ -2357,7 +2358,7 @@ int netdev_register_kobject(struct net_device *ndev) error = device_add(dev); if (error) - return error; + goto out_put_device; error = register_queue_kobjects(ndev); if (error) { @@ -2367,6 +2368,10 @@ int netdev_register_kobject(struct net_device *ndev) pm_runtime_set_memalloc_noio(dev, true); + return 0; + +out_put_device: + put_device(dev); return error; } -- 2.17.1

1 week, 6 days

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[PATCH] arm64/pageattr: Propagate return value from __change_memory_common

by Dev Jain

Post a166563e7ec3 ("arm64: mm: support large block mapping when rodata=full"), __change_memory_common has a real chance of failing due to split failure. Before that commit, this line was introduced in c55191e96caa, still having a chance of failing if it needs to allocate pagetable memory in apply_to_page_range, although that has never been observed to be true. In general, we should always propagate the return value to the caller. Cc: stable(a)vger.kernel.org Fixes: c55191e96caa ("arm64: mm: apply r/o permissions of VM areas to its linear alias as well") Signed-off-by: Dev Jain <dev.jain(a)arm.com> --- Based on Linux 6.18-rc4. arch/arm64/mm/pageattr.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index 5135f2d66958..b4ea86cd3a71 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -148,6 +148,7 @@ static int change_memory_common(unsigned long addr, int numpages, unsigned long size = PAGE_SIZE * numpages; unsigned long end = start + size; struct vm_struct *area; + int ret; int i; if (!PAGE_ALIGNED(addr)) { @@ -185,8 +186,10 @@ static int change_memory_common(unsigned long addr, int numpages, if (rodata_full && (pgprot_val(set_mask) == PTE_RDONLY || pgprot_val(clear_mask) == PTE_RDONLY)) { for (i = 0; i < area->nr_pages; i++) { - __change_memory_common((u64)page_address(area->pages[i]), + ret = __change_memory_common((u64)page_address(area->pages[i]), PAGE_SIZE, set_mask, clear_mask); + if (ret) + return ret; } } -- 2.30.2

1 week, 6 days

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