CVE-2024-50140

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-50140
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-50140.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-50140
Downstream
Related
Published
2024-11-07T09:31:17.379Z
Modified
2025-11-16T06:39:04.027169Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
sched/core: Disable page allocation in task_tick_mm_cid()
Details

In the Linux kernel, the following vulnerability has been resolved:

sched/core: Disable page allocation in tasktickmm_cid()

With KASAN and PREEMPTRT enabled, calling taskworkadd() in tasktickmmcid() may cause the following splat.

[ 63.696416] BUG: sleeping function called from invalid context at kernel/locking/spinlockrt.c:48 [ 63.696416] inatomic(): 1, irqsdisabled(): 1, nonblock: 0, pid: 610, name: modprobe [ 63.696416] preempt_count: 10001, expected: 0 [ 63.696416] RCU nest depth: 1, expected: 1

This problem is caused by the following call trace.

schedtick() [ acquire rq->lock ] -> tasktickmmcid() -> taskworkadd() -> _kasanrecordauxstack() -> kasansavestack() -> stackdepotsaveflags() -> allocpagesmpolnoprof() -> _allocpagesnoprof() -> getpagefromfreelist() -> rmqueue() -> rmqueuepcplist() -> _rmqueuepcplist() -> rmqueuebulk() -> rtspinlock()

The rq lock is a rawspinlockt. We can't sleep while holding it. IOW, we can't call allocpages() in stackdepotsaveflags().

The tasktickmmcid() function with its taskworkadd() call was introduced by commit 223baf9d17f2 ("sched: Fix performance regression introduced by mmcid") in v6.4 kernel.

Fortunately, there is a kasanrecordauxstacknoalloc() variant that calls stackdepotsaveflags() while not allowing it to allocate new pages. To allow tasktickmmcid() to use taskwork without page allocation, a new TWAFNOALLOC flag is added to enable calling kasanrecordauxstacknoalloc() instead of kasanrecordauxstack() if set. The tasktickmm_cid() function is modified to add this new flag.

The possible downside is the missing stack trace in a KASAN report due to new page allocation required when taskworkadd_noallloc() is called which should be rare.

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
223baf9d17f25e2608dbdff7232c095c1e612268
Fixed
509c29d0d26f68a6f6d0a05cb1a89725237e2b87
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
223baf9d17f25e2608dbdff7232c095c1e612268
Fixed
ce0241ef83eed55f675376e8a3605d23de53d875
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
223baf9d17f25e2608dbdff7232c095c1e612268
Fixed
73ab05aa46b02d96509cb029a8d04fca7bbde8c7

Affected versions

v6.*

v6.10
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.11
v6.11-rc1
v6.11-rc2
v6.11-rc3
v6.11-rc4
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.11.1
v6.11.2
v6.11.3
v6.11.4
v6.11.5
v6.12-rc1
v6.3
v6.4
v6.4-rc1
v6.4-rc2
v6.4-rc3
v6.4-rc4
v6.4-rc5
v6.4-rc6
v6.4-rc7
v6.5
v6.5-rc1
v6.5-rc2
v6.5-rc3
v6.5-rc4
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.6.1
v6.6.10
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.2
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.24
v6.6.25
v6.6.26
v6.6.27
v6.6.28
v6.6.29
v6.6.3
v6.6.30
v6.6.31
v6.6.32
v6.6.33
v6.6.34
v6.6.35
v6.6.36
v6.6.37
v6.6.38
v6.6.39
v6.6.4
v6.6.40
v6.6.41
v6.6.42
v6.6.43
v6.6.44
v6.6.45
v6.6.46
v6.6.47
v6.6.48
v6.6.49
v6.6.5
v6.6.50
v6.6.51
v6.6.52
v6.6.53
v6.6.54
v6.6.55
v6.6.56
v6.6.57
v6.6.58
v6.6.6
v6.6.7
v6.6.8
v6.6.9
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7

Database specific

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Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.4.0
Fixed
6.6.59
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.11.6