In the Linux kernel, the following vulnerability has been resolved:
filelock: Remove locks reliably when fcntl/close race is detected
When fcntl_setlk() races with close(), it removes the created lock with
do_lock_file_wait().
However, LSMs can allow the first do_lock_file_wait() that created the lock
while denying the second do_lock_file_wait() that tries to remove the lock.
Separately, posix_lock_file() could also fail to
remove a lock due to GFP_KERNEL allocation failure (when splitting a range
in the middle).
After the bug has been triggered, use-after-free reads will occur in
lock_get_status() when userspace reads /proc/locks. This can likely be used
to read arbitrary kernel memory, but can’t corrupt kernel memory.
Fix it by calling locks_remove_posix() instead, which is designed to
reliably get rid of POSIX locks associated with the given file and
files_struct and is also used by filp_flush().
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/locks.c"
],
"versions": [
{
"version": "c293621bbf67",
"lessThan": "d30ff3304083",
"status": "affected",
"versionType": "git"
},
{
"version": "c293621bbf67",
"lessThan": "dc2ce1dfceaa",
"status": "affected",
"versionType": "git"
},
{
"version": "c293621bbf67",
"lessThan": "5661b9c7ec18",
"status": "affected",
"versionType": "git"
},
{
"version": "c293621bbf67",
"lessThan": "52c87ab18c76",
"status": "affected",
"versionType": "git"
},
{
"version": "c293621bbf67",
"lessThan": "ef8fc41cd6f9",
"status": "affected",
"versionType": "git"
},
{
"version": "c293621bbf67",
"lessThan": "5f5d0799eb0a",
"status": "affected",
"versionType": "git"
},
{
"version": "c293621bbf67",
"lessThan": "b6d223942c34",
"status": "affected",
"versionType": "git"
},
{
"version": "c293621bbf67",
"lessThan": "3cad1bc01041",
"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/locks.c"
],
"versions": [
{
"version": "2.6.13",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.13",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.319",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.281",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.223",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.164",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.101",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.42",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.9.9",
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/3cad1bc010416c6dd780643476bc59ed742436b9
git.kernel.org/stable/c/52c87ab18c76c14d7209646ccb3283b3f5d87b22
git.kernel.org/stable/c/5661b9c7ec189406c2dde00837aaa4672efb6240
git.kernel.org/stable/c/5f5d0799eb0a01d550c21b7894e26b2d9db55763
git.kernel.org/stable/c/b6d223942c34057fdfd8f149e763fa823731b224
git.kernel.org/stable/c/d30ff33040834c3b9eee29740acd92f9c7ba2250
git.kernel.org/stable/c/dc2ce1dfceaa0767211a9d963ddb029ab21c4235
git.kernel.org/stable/c/ef8fc41cd6f95f9a4a3470f085aecf350569a0b3