In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to don’t dirty inode for readonly filesystem
syzbot reports f2fs bug as below:
kernel BUG at fs/f2fs/inode.c:933!
RIP: 0010:f2fs_evict_inode+0x1576/0x1590 fs/f2fs/inode.c:933
Call Trace:
evict+0x2a4/0x620 fs/inode.c:664
dispose_list fs/inode.c:697 [inline]
evict_inodes+0x5f8/0x690 fs/inode.c:747
generic_shutdown_super+0x9d/0x2c0 fs/super.c:675
kill_block_super+0x44/0x90 fs/super.c:1667
kill_f2fs_super+0x303/0x3b0 fs/f2fs/super.c:4894
deactivate_locked_super+0xc1/0x130 fs/super.c:484
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1256
task_work_run+0x24a/0x300 kernel/task_work.c:180
ptrace_notify+0x2cd/0x380 kernel/signal.c:2399
ptrace_report_syscall include/linux/ptrace.h:411 [inline]
ptrace_report_syscall_exit include/linux/ptrace.h:473 [inline]
syscall_exit_work kernel/entry/common.c:251 [inline]
syscall_exit_to_user_mode_prepare kernel/entry/common.c:278 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x15c/0x280 kernel/entry/common.c:296
do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88
entry_SYSCALL_64_after_hwframe+0x63/0x6b
The root cause is:
do_sys_open
f2fs_lookup
__f2fs_find_entry
f2fs_i_depth_write
- f2fs_mark_inode_dirty_sync
umount
kill_f2fs_super
kill_block_super
generic_shutdown_super
- sync_filesystem
: sb is readonly, skip sync_filesystem()
- evict_inodes
When we try to repair i_current_depth in readonly filesystem, let’s
skip dirty inode to avoid panic in later f2fs_evict_inode().
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/f2fs/inode.c"
],
"versions": [
{
"version": "1da177e4c3f4",
"lessThan": "2d2916516577",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "54162974aea3",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "54bc4e88447e",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "ec56571b4b14",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "9ce8135accf1",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "e62ff092a42f",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "2434344559f6",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "192b8fb8d1c8",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/f2fs/inode.c"
],
"versions": [
{
"version": "4.19.320",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.282",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.224",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.165",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.103",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.44",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10.3",
"lessThanOrEqual": "6.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.11",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/192b8fb8d1c8ca3c87366ebbef599fa80bb626b8
git.kernel.org/stable/c/2434344559f6743efb3ac15d11af9a0db9543bd3
git.kernel.org/stable/c/2d2916516577f2239b3377d9e8d12da5e6ccdfcf
git.kernel.org/stable/c/54162974aea37a8cae00742470a78c7f6bd6f915
git.kernel.org/stable/c/54bc4e88447e385c4d4ffa85d93e0dce628fcfa6
git.kernel.org/stable/c/9ce8135accf103f7333af472709125878704fdd4
git.kernel.org/stable/c/e62ff092a42f4a1bae3b310cf46673b4f3aac3b5
git.kernel.org/stable/c/ec56571b4b146a1cfbedab49d5fcaf19fe8bf4f1