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[PATCH 0/3] ext4: Add support for mounted updates to the superblock via an ioctl

by Theodore Ts'o via B4 Relay

This patch series enables a future version of tune2fs to be able to modify certain parts of the ext4 superblock without to write to the block device. The first patch fixes a potential buffer overrun caused by a maliciously moified superblock. The second patch adds support for 32-bit uid and gid's which can have access to the reserved blocks pool. The last patch adds the ioctl's which will be used by tune2fs. Signed-off-by: Theodore Ts'o <tytso(a)mit.edu> --- Theodore Ts'o (3): ext4: avoid potential buffer over-read in parse_apply_sb_mount_options() ext4: add support for 32-bit default reserved uid and gid values ext4: implemet new ioctls to set and get superblock parameters fs/ext4/ext4.h | 16 ++++- fs/ext4/ioctl.c | 256 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--- fs/ext4/super.c | 25 +++----- include/uapi/linux/ext4.h | 75 ++++++++++++++++++++++ 4 files changed, 348 insertions(+), 24 deletions(-) --- base-commit: b320789d6883cc00ac78ce83bccbfe7ed58afcf0 change-id: 20250830-tune2fs-3376beb72403 Best regards, -- Theodore Ts'o <tytso(a)mit.edu>

2 months, 1 week

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Re: Linux 6.16.7

by Ronald Warsow

Hallo ... Urrggghhh, fetched the wrong kernel (6.6.17 instead 6.16.7) sorry for the noise -- Ronald

2 months, 1 week

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Re: Linux 6.16.7

by Ronald Warsow

Hallo 6.16.7 does not compile here config is the same as with 6.16.6 any advice ? === ... CC init/initramfs.o AS arch/x86/realmode/rm/wakeup_asm.o CC arch/x86/entry/vdso/vdso32/vclock_gettime.o CC arch/x86/realmode/rm/wakemain.o In file included from ./include/uapi/linux/posix_types.h:5, from ./include/uapi/linux/types.h:14, from ./include/linux/types.h:6, from arch/x86/realmode/rm/wakeup.h:11, from arch/x86/realmode/rm/wakemain.c:2: ./include/linux/stddef.h:11:9: error: cannot use keyword ‘false’ as enumeration constant 11 | false = 0, | ^~~~~ ./include/linux/stddef.h:11:9: note: ‘false’ is a keyword with ‘-std=c23’ onwards ./include/linux/types.h:35:33: error: ‘bool’ cannot be defined via ‘typedef’ 35 | typedef _Bool bool; | ^~~~ ./include/linux/types.h:35:33: note: ‘bool’ is a keyword with ‘-std=c23’ onwards ./include/linux/types.h:35:1: warning: useless type name in empty declaration 35 | typedef _Bool bool; | ^~~~~~~ CC init/calibrate.o make[5]: *** [scripts/Makefile.build:243: arch/x86/realmode/rm/wakemain.o] Error 1 ... CC kernel/bpf/trampoline.o CC fs/smb/client/readdir.o fs/btrfs/print-tree.c:29:49: warning: initializer-string for array of ‘char’ truncates NUL terminator but destination lacks ‘nonstring’ attribute (17 chars into 16 available) [-Wunterminated-string-initialization] 29 | { BTRFS_BLOCK_GROUP_TREE_OBJECTID, "BLOCK_GROUP_TREE" }, | ^~~~~~~~~~~~~~~~~~ CC fs/btrfs/root-tree.o CC fs/efivarfs/inode.o CC kernel/trace/trace_probe.o CC [M] fs/pstore/ram_core.o In file included from ./include/linux/string.h:294, from ./include/linux/bitmap.h:11, from ./include/linux/inetdevice.h:7, from fs/smb/server/smb2pdu.c:7: In function ‘fortify_memset_chk’, inlined from ‘ntlm_negotiate’ at fs/smb/server/smb2pdu.c:1354:2, inlined from ‘smb2_sess_setup’ at fs/smb/server/smb2pdu.c:1828:10: ./include/linux/fortify-string.h:493:25: warning: call to ‘__write_overflow_field’ declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning] 493 | __write_overflow_field(p_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CC fs/smb/server/ksmbd_spnego_negtokeninit.asn1.o ... CC fs/btrfs/discard.o In file included from ./include/linux/string.h:294, from ./include/linux/bitmap.h:11, from ./include/linux/cpumask.h:12, from ./arch/x86/include/asm/cpumask.h:5, from ./arch/x86/include/asm/msr.h:11, from ./arch/x86/include/asm/processor.h:23, from ./arch/x86/include/asm/cpufeature.h:5, from ./arch/x86/include/asm/thread_info.h:53, from ./include/linux/thread_info.h:60, from ./arch/x86/include/asm/preempt.h:9, from ./include/linux/preempt.h:79, from ./include/linux/spinlock.h:56, from ./include/linux/wait.h:9, from ./include/linux/wait_bit.h:8, from ./include/linux/fs.h:6, from fs/smb/client/cifssmb.c:17: In function ‘fortify_memcpy_chk’, inlined from ‘CIFSSMBSetPathInfo’ at fs/smb/client/cifssmb.c:5375:2: ./include/linux/fortify-string.h:583:25: warning: call to ‘__write_overflow_field’ declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning] 583 | __write_overflow_field(p_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AR fs/smb/client/built-in.a AR fs/smb/built-in.a CC fs/btrfs/reflink.o CC fs/btrfs/subpage.o CC fs/btrfs/tree-mod-log.o CC fs/btrfs/extent-io-tree.o CC fs/btrfs/fs.o CC fs/btrfs/messages.o CC fs/btrfs/bio.o CC fs/btrfs/lru_cache.o CC fs/btrfs/acl.o CC fs/btrfs/zoned.o CC fs/btrfs/verity.o fs/btrfs/send.c: In function ‘btrfs_ioctl_send’: fs/btrfs/send.c:8208:44: warning: ‘kvcalloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args] 8208 | sctx->clone_roots = kvcalloc(sizeof(*sctx->clone_roots), | ^ fs/btrfs/send.c:8208:44: note: earlier argument should specify number of elements, later size of each element AR fs/btrfs/built-in.a AR fs/built-in.a make[1]: *** [/home/DATA/DEVEL/linux-6.6.17/Makefile:1913: .] Error 2 make: *** [Makefile:234: __sub-make] Error 2 error in make

2 months, 1 week

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Linux 6.16.7

by Greg Kroah-Hartman

I'm announcing the release of the 6.16.7 kernel. All users of the 6.16 kernel series must upgrade. The updated 6.16.y git tree can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-6.16.y and can be browsed at the normal kernel.org git web browser: https://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary thanks, greg k-h ------------ Documentation/ABI/testing/sysfs-devices-system-cpu | 1 Documentation/admin-guide/hw-vuln/index.rst | 1 Documentation/admin-guide/hw-vuln/vmscape.rst | 110 ++++++++ Documentation/admin-guide/kernel-parameters.txt | 11 Makefile | 2 arch/x86/Kconfig | 9 arch/x86/include/asm/cpufeatures.h | 2 arch/x86/include/asm/entry-common.h | 7 arch/x86/include/asm/nospec-branch.h | 2 arch/x86/kernel/cpu/bugs.c | 285 ++++++++++++++------- arch/x86/kernel/cpu/common.c | 86 ++++-- arch/x86/kvm/x86.c | 9 drivers/base/cpu.c | 3 include/linux/cpu.h | 1 14 files changed, 415 insertions(+), 114 deletions(-) Greg Kroah-Hartman (1): Linux 6.16.7 Pawan Gupta (7): Documentation/hw-vuln: Add VMSCAPE documentation x86/vmscape: Enumerate VMSCAPE bug x86/vmscape: Add conditional IBPB mitigation x86/vmscape: Enable the mitigation x86/bugs: Move cpu_bugs_smt_update() down x86/vmscape: Warn when STIBP is disabled with SMT x86/vmscape: Add old Intel CPUs to affected list

2 months, 1 week

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Linux 6.12.47

by Greg Kroah-Hartman

I'm announcing the release of the 6.12.47 kernel. All users of the 6.12 kernel series must upgrade. The updated 6.12.y git tree can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-6.12.y and can be browsed at the normal kernel.org git web browser: https://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary thanks, greg k-h ------------ Documentation/ABI/testing/sysfs-devices-system-cpu | 1 Documentation/admin-guide/hw-vuln/index.rst | 1 Documentation/admin-guide/hw-vuln/vmscape.rst | 110 ++++++++ Documentation/admin-guide/kernel-parameters.txt | 11 Makefile | 2 arch/x86/Kconfig | 9 arch/x86/include/asm/cpufeatures.h | 2 arch/x86/include/asm/entry-common.h | 7 arch/x86/include/asm/nospec-branch.h | 2 arch/x86/kernel/cpu/bugs.c | 257 ++++++++++++++------- arch/x86/kernel/cpu/common.c | 84 ++++-- arch/x86/kvm/x86.c | 9 drivers/base/cpu.c | 3 include/linux/cpu.h | 1 14 files changed, 394 insertions(+), 105 deletions(-) Greg Kroah-Hartman (1): Linux 6.12.47 Pawan Gupta (7): Documentation/hw-vuln: Add VMSCAPE documentation x86/vmscape: Enumerate VMSCAPE bug x86/vmscape: Add conditional IBPB mitigation x86/vmscape: Enable the mitigation x86/bugs: Move cpu_bugs_smt_update() down x86/vmscape: Warn when STIBP is disabled with SMT x86/vmscape: Add old Intel CPUs to affected list

2 months, 1 week

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Linux 6.6.106

by Greg Kroah-Hartman

I'm announcing the release of the 6.6.106 kernel. All users of the 6.6 kernel series must upgrade. The updated 6.6.y git tree can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-6.6.y and can be browsed at the normal kernel.org git web browser: https://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary thanks, greg k-h ------------ Documentation/ABI/testing/sysfs-devices-system-cpu | 1 Documentation/admin-guide/hw-vuln/index.rst | 1 Documentation/admin-guide/hw-vuln/vmscape.rst | 110 ++++++++ Documentation/admin-guide/kernel-parameters.txt | 11 Makefile | 2 arch/x86/Kconfig | 9 arch/x86/include/asm/cpufeatures.h | 2 arch/x86/include/asm/entry-common.h | 7 arch/x86/include/asm/nospec-branch.h | 2 arch/x86/kernel/cpu/bugs.c | 257 ++++++++++++++------- arch/x86/kernel/cpu/common.c | 82 ++++-- arch/x86/kvm/x86.c | 9 drivers/base/cpu.c | 3 include/linux/cpu.h | 1 14 files changed, 392 insertions(+), 105 deletions(-) Greg Kroah-Hartman (1): Linux 6.6.106 Pawan Gupta (7): Documentation/hw-vuln: Add VMSCAPE documentation x86/vmscape: Enumerate VMSCAPE bug x86/vmscape: Add conditional IBPB mitigation x86/vmscape: Enable the mitigation x86/bugs: Move cpu_bugs_smt_update() down x86/vmscape: Warn when STIBP is disabled with SMT x86/vmscape: Add old Intel CPUs to affected list

2 months, 1 week

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Linux 6.1.152

by Greg Kroah-Hartman

I'm announcing the release of the 6.1.152 kernel. All users of the 6.1 kernel series must upgrade. The updated 6.1.y git tree can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-6.1.y and can be browsed at the normal kernel.org git web browser: https://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary thanks, greg k-h ------------ Documentation/ABI/testing/sysfs-devices-system-cpu | 1 Documentation/admin-guide/hw-vuln/index.rst | 1 Documentation/admin-guide/hw-vuln/vmscape.rst | 110 ++++++++ Documentation/admin-guide/kernel-parameters.txt | 11 Makefile | 2 arch/x86/Kconfig | 9 arch/x86/include/asm/cpufeatures.h | 2 arch/x86/include/asm/entry-common.h | 7 arch/x86/include/asm/nospec-branch.h | 2 arch/x86/kernel/cpu/bugs.c | 257 ++++++++++++++------- arch/x86/kernel/cpu/common.c | 80 ++++-- arch/x86/kvm/x86.c | 9 drivers/base/cpu.c | 7 include/linux/cpu.h | 1 14 files changed, 394 insertions(+), 105 deletions(-) Greg Kroah-Hartman (1): Linux 6.1.152 Pawan Gupta (7): Documentation/hw-vuln: Add VMSCAPE documentation x86/vmscape: Enumerate VMSCAPE bug x86/vmscape: Add conditional IBPB mitigation x86/vmscape: Enable the mitigation x86/bugs: Move cpu_bugs_smt_update() down x86/vmscape: Warn when STIBP is disabled with SMT x86/vmscape: Add old Intel CPUs to affected list

2 months, 1 week

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Linux 5.15.193

by Greg Kroah-Hartman

I'm announcing the release of the 5.15.193 kernel. All users of the 5.15 kernel series must upgrade. The updated 5.15.y git tree can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.15.y and can be browsed at the normal kernel.org git web browser: https://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary thanks, greg k-h ------------ Documentation/ABI/testing/sysfs-devices-system-cpu | 1 Documentation/admin-guide/hw-vuln/index.rst | 1 Documentation/admin-guide/hw-vuln/vmscape.rst | 110 ++++++++ Documentation/admin-guide/kernel-parameters.txt | 11 Makefile | 2 arch/x86/Kconfig | 9 arch/x86/include/asm/cpufeatures.h | 2 arch/x86/include/asm/entry-common.h | 7 arch/x86/include/asm/nospec-branch.h | 2 arch/x86/kernel/cpu/bugs.c | 264 ++++++++++++++------- arch/x86/kernel/cpu/common.c | 77 +++--- arch/x86/kvm/x86.c | 9 drivers/base/cpu.c | 6 include/linux/cpu.h | 1 14 files changed, 393 insertions(+), 109 deletions(-) Greg Kroah-Hartman (1): Linux 5.15.193 Pawan Gupta (7): Documentation/hw-vuln: Add VMSCAPE documentation x86/vmscape: Enumerate VMSCAPE bug x86/vmscape: Add conditional IBPB mitigation x86/vmscape: Enable the mitigation x86/bugs: Move cpu_bugs_smt_update() down x86/vmscape: Warn when STIBP is disabled with SMT x86/vmscape: Add old Intel CPUs to affected list

2 months, 1 week

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Linux 5.10.244

by Greg Kroah-Hartman

I'm announcing the release of the 5.10.244 kernel. All users of the 5.10 kernel series must upgrade. The updated 5.10.y git tree can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.10.y and can be browsed at the normal kernel.org git web browser: https://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary thanks, greg k-h ------------ Documentation/ABI/testing/sysfs-devices-system-cpu | 1 Documentation/admin-guide/hw-vuln/index.rst | 1 Documentation/admin-guide/hw-vuln/vmscape.rst | 110 ++++++++ Documentation/admin-guide/kernel-parameters.txt | 11 Makefile | 2 arch/x86/Kconfig | 9 arch/x86/include/asm/cpufeatures.h | 2 arch/x86/include/asm/entry-common.h | 7 arch/x86/include/asm/nospec-branch.h | 2 arch/x86/kernel/cpu/bugs.c | 264 ++++++++++++++------- arch/x86/kernel/cpu/common.c | 74 +++-- arch/x86/kvm/x86.c | 9 drivers/base/cpu.c | 6 include/linux/cpu.h | 1 14 files changed, 390 insertions(+), 109 deletions(-) Greg Kroah-Hartman (1): Linux 5.10.244 Pawan Gupta (7): Documentation/hw-vuln: Add VMSCAPE documentation x86/vmscape: Enumerate VMSCAPE bug x86/vmscape: Add conditional IBPB mitigation x86/vmscape: Enable the mitigation x86/bugs: Move cpu_bugs_smt_update() down x86/vmscape: Warn when STIBP is disabled with SMT x86/vmscape: Add old Intel CPUs to affected list

2 months, 1 week

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[PATCH] sched/core: Fix potential deadlock on rq lock

by Wang Tao

When CPU 1 enters the nohz_full state, and the kworker on CPU 0 executes the function sched_tick_remote, holding the lock on CPU1's rq and triggering the warning WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3). This leads to the process of printing the warning message, where the console_sem semaphore is held. At this point, the print task on the CPU1's rq cannot acquire the console_sem and joins the wait queue, entering the UNINTERRUPTIBLE state. It waits for the console_sem to be released and then wakes up. After the task on CPU 0 releases the console_sem, it wakes up the waiting console_sem task. In try_to_wake_up, it attempts to acquire the lock on CPU1's rq again, resulting in a deadlock. The triggering scenario is as follows: CPU0 CPU1 sched_tick_remote WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3) report_bug con_write printk console_unlock do_con_write console_lock down(&console_sem) list_add_tail(&waiter.list, &sem->wait_list); up(&console_sem) wake_up_q(&wake_q) try_to_wake_up __task_rq_lock _raw_spin_lock This patch fixes the issue by deffering all printk console printing during the lock holding period. Fixes: d84b31313ef8 ("sched/isolation: Offload residual 1Hz scheduler tick") Signed-off-by: Wang Tao <wangtao554(a)huawei.com> --- kernel/sched/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index be00629f0ba4..8b2d5b5bfb93 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5723,8 +5723,10 @@ static void sched_tick_remote(struct work_struct *work) * Make sure the next tick runs within a * reasonable amount of time. */ + printk_deferred_enter(); u64 delta = rq_clock_task(rq) - curr->se.exec_start; WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3); + printk_deferred_exit(); } curr->sched_class->task_tick(rq, curr, 0); -- 2.34.1

2 months, 1 week

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