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| author | Chao Yu <yuchao0@huawei.com> | 2021-05-07 18:10:38 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-19 09:45:03 +0200 |
| commit | 86786603014e0a22d0d6af8e80ae4b8687927048 (patch) | |
| tree | c6bdec3498b383266c6f9f815fc31c0134e449da /include/linux/cper.h | |
| parent | 5e4f5138bd8522ebe231a137682d3857209a2c07 (diff) | |
| download | kernel_replicant_linux-86786603014e0a22d0d6af8e80ae4b8687927048.tar.gz kernel_replicant_linux-86786603014e0a22d0d6af8e80ae4b8687927048.tar.bz2 kernel_replicant_linux-86786603014e0a22d0d6af8e80ae4b8687927048.zip | |
f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances
commit cad83c968c2ebe97905f900326988ed37146c347 upstream.
As syzbot reported, there is an use-after-free issue during f2fs recovery:
Use-after-free write at 0xffff88823bc16040 (in kfence-#10):
kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486
f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869
f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945
mount_bdev+0x26c/0x3a0 fs/super.c:1367
legacy_get_tree+0xea/0x180 fs/fs_context.c:592
vfs_get_tree+0x86/0x270 fs/super.c:1497
do_new_mount fs/namespace.c:2905 [inline]
path_mount+0x196f/0x2be0 fs/namespace.c:3235
do_mount fs/namespace.c:3248 [inline]
__do_sys_mount fs/namespace.c:3456 [inline]
__se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433
do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae
The root cause is multi f2fs filesystem instances can race on accessing
global fsync_entry_slab pointer, result in use-after-free issue of slab
cache, fixes to init/destroy this slab cache only once during module
init/destroy procedure to avoid this issue.
Reported-by: syzbot+9d90dad32dd9727ed084@syzkaller.appspotmail.com
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/cper.h')
0 files changed, 0 insertions, 0 deletions