CVE-2025-38424
perf: Fix sample vs do_exit()
We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.
Please see our statement on Data Privacy.
perf: Fix sample vs do_exit()
In the Linux kernel, the following vulnerability has been resolved: perf: Fix sample vs do_exit() Baisheng Gao reported an ARM64 crash, which Mark decoded as being a synchronous external abort -- most likely due to trying to access MMIO in bad ways. The crash further shows perf trying to do a user stack sample while in exit_mmap()'s tlb_finish_mmu() -- i.e. while tearing down the address space it is trying to access. It turns out that we stop perf after we tear down the userspace mm; a receipie for disaster, since perf likes to access userspace for various reasons. Flip this order by moving up where we stop perf in do_exit(). Additionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER to abort when the current task does not have an mm (exit_mm() makes sure to set current->mm = NULL; before commencing with the actual teardown). Such that CPU wide events don't trip on this same problem.
Reserved 2025-04-16 | Published 2025-07-25 | Updated 2025-07-25 | Assigner Linuxgit.kernel.org/...c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e
git.kernel.org/...c/507c9a595bad3abd107c6a8857d7fd125d89f386
git.kernel.org/...c/a9f6aab7910a0ef2895797f15c947f6d1053160f
git.kernel.org/...c/975ffddfa2e19823c719459d2364fcaa17673964
git.kernel.org/...c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b
git.kernel.org/...c/456019adaa2f5366b89c868dea9b483179bece54
git.kernel.org/...c/7311970d07c4606362081250da95f2c7901fc0db
git.kernel.org/...c/4f6fc782128355931527cefe3eb45338abd8ab39
Support options
