- Vulnerability/
- CVE-2024-41021
CVE-2024-41021: s390/mm: Fix VM_FAULT_HWPOISON handling in do_exception()
First published: Mon Jul 29 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: s390/mm: Fix VM_FAULT_HWPOISON handling in do_exception() There is no support for HWPOISON, MEMORY_FAILURE, or ARCH_HAS_COPY_MC on s390. Therefore we do not expect to see VM_FAULT_HWPOISON in do_exception(). However, since commit af19487f00f3 ("mm: make PTE_MARKER_SWAPIN_ERROR more general"), it is possible to see VM_FAULT_HWPOISON in combination with PTE_MARKER_POISONED, even on architectures that do not support HWPOISON otherwise. In this case, we will end up on the BUG() in do_exception(). Fix this by treating VM_FAULT_HWPOISON the same as VM_FAULT_SIGBUS, similar to x86 when MEMORY_FAILURE is not configured. Also print unexpected fault flags, for easier debugging. Note that VM_FAULT_HWPOISON_LARGE is not expected, because s390 cannot support swap entries on other levels than PTE level.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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/73a9260b7366d2906ec011e100319359fe2277d0
- https://git.kernel.org/stable/c/9e13767ccefdc4f8aa92514b592b60f6b54882ff
- https://git.kernel.org/stable/c/a3aefb871222a9880602d1a44a558177b4143e3b
- https://git.kernel.org/stable/c/df39038cd89525d465c2c8827eb64116873f141a
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-41021
- https://nvd.nist.gov/vuln/detail/CVE-2024-41021
- https://launchpad.net/bugs/cve/CVE-2024-41021
- https://security-tracker.debian.org/tracker/CVE-2024-41021
- https://ubuntu.com/security/CVE-2024-41021
- https://git.kernel.org/linus/df39038cd89525d465c2c8827eb64116873f141a
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