In the Linux kernel, the following vulnerability has been resolved:
ovl: fix leaked dentry
Since commit 6815f479ca90 (“ovl: use only uppermetacopy state in
ovl_lookup()”), overlayfs doesn’t put temporary dentry when there is a
metacopy error, which leads to dentry leaks when shutting down the related
superblock:
overlayfs: refusing to follow metacopy origin for (/file0)
…
BUG: Dentry (ptrval){i=3f33,n=file3} still in use (1) [unmount of overlay overlay]
…
WARNING: CPU: 1 PID: 432 at umount_check.cold+0x107/0x14d
CPU: 1 PID: 432 Comm: unmount-overlay Not tainted 5.12.0-rc5 #1
…
RIP: 0010:umount_check.cold+0x107/0x14d
…
Call Trace:
d_walk+0x28c/0x950
? dentry_lru_isolate+0x2b0/0x2b0
? __kasan_slab_free+0x12/0x20
do_one_tree+0x33/0x60
shrink_dcache_for_umount+0x78/0x1d0
generic_shutdown_super+0x70/0x440
kill_anon_super+0x3e/0x70
deactivate_locked_super+0xc4/0x160
deactivate_super+0xfa/0x140
cleanup_mnt+0x22e/0x370
__cleanup_mnt+0x1a/0x30
task_work_run+0x139/0x210
do_exit+0xb0c/0x2820
? __kasan_check_read+0x1d/0x30
? find_held_lock+0x35/0x160
? lock_release+0x1b6/0x660
? mm_update_next_owner+0xa20/0xa20
? reacquire_held_locks+0x3f0/0x3f0
? __sanitizer_cov_trace_const_cmp4+0x22/0x30
do_group_exit+0x135/0x380
__do_sys_exit_group.isra.0+0x20/0x20
__x64_sys_exit_group+0x3c/0x50
do_syscall_64+0x45/0x70
entry_SYSCALL_64_after_hwframe+0x44/0xae
…
VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds. Have a nice day…
This fix has been tested with a syzkaller reproducer.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/overlayfs/namei.c"
],
"versions": [
{
"version": "6815f479ca90",
"lessThan": "71d58457a8af",
"status": "affected",
"versionType": "git"
},
{
"version": "6815f479ca90",
"lessThan": "cf3e3330bc57",
"status": "affected",
"versionType": "git"
},
{
"version": "6815f479ca90",
"lessThan": "d587cfaef72b",
"status": "affected",
"versionType": "git"
},
{
"version": "6815f479ca90",
"lessThan": "eaab1d45cdb4",
"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/overlayfs/namei.c"
],
"versions": [
{
"version": "5.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.8",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.35",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.11.19",
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.12.2",
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.13",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]