CVE-2024-44958: sched/smt: Fix unbalance sched_smt_present dec/inc
First published: Wed Sep 04 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: sched/smt: Fix unbalance sched_smt_present dec/inc I got the following warn report while doing stress test: jump label: negative count! WARNING: CPU: 3 PID: 38 at kernel/jump_label.c:263 static_key_slow_try_dec+0x9d/0xb0 Call Trace: <TASK> __static_key_slow_dec_cpuslocked+0x16/0x70 sched_cpu_deactivate+0x26e/0x2a0 cpuhp_invoke_callback+0x3ad/0x10d0 cpuhp_thread_fun+0x3f5/0x680 smpboot_thread_fn+0x56d/0x8d0 kthread+0x309/0x400 ret_from_fork+0x41/0x70 ret_from_fork_asm+0x1b/0x30 </TASK> Because when cpuset_cpu_inactive() fails in sched_cpu_deactivate(), the cpu offline failed, but sched_smt_present is decremented before calling sched_cpu_deactivate(), it leads to unbalanced dec/inc, so fix it by incrementing sched_smt_present in the error path.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=4.14.86<4.15 | |
| Linux Linux kernel | >=4.19.7<4.20 | |
| Linux Linux kernel | >=4.20<5.15.165 | |
| Linux Linux kernel | >=5.16<6.1.105 | |
| Linux Linux kernel | >=6.2<6.6.46 | |
| Linux Linux kernel | >=6.7<6.10.5 | |
| Linux Linux kernel | =6.11-rc1 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/2a3548c7ef2e135aee40e7e5e44e7d11b893e7c4
- https://git.kernel.org/stable/c/2cf7665efe451e48d27953e6b5bc627d518c902b
- https://git.kernel.org/stable/c/65727331b60197b742089855ac09464c22b96f66
- https://git.kernel.org/stable/c/d0c87a3c6be10a57aa3463c32c3fc6b2a47c3dab
- https://git.kernel.org/stable/c/e22f910a26cc2a3ac9c66b8e935ef2a7dd881117
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44958
- https://nvd.nist.gov/vuln/detail/CVE-2024-44958
- https://launchpad.net/bugs/cve/CVE-2024-44958
- https://security-tracker.debian.org/tracker/CVE-2024-44958
- https://ubuntu.com/security/CVE-2024-44958
- https://git.kernel.org/linus/e22f910a26cc2a3ac9c66b8e935ef2a7dd881117
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