sched/rseq: Fix concurrency ID handling of usermodehelper kthreads

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sched_mm_cid_after_execve() does not expect NULL t->mm, but it may happen
if a usermodehelper kthread fails when attempting to execute a binary.

sched_mm_cid_fork() can be issued from a usermodehelper kthread, which
has t->flags PF_KTHREAD set.

Fixes: af7f588d8f ("sched: Introduce per-memory-map concurrency ID")
Reported-by: kernel test robot <yujie.liu@intel.com>
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/oe-lkp/202212301353.5c959d72-yujie.liu@intel.com

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Mathieu Desnoyers 2023-01-02 10:12:16 -05:00 • committed by Borislav Petkov (AMD)

parent c89970202a

commit bbd0b03150

1 changed files with 3 additions and 3 deletions

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kernel/sched/core.c

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