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sched/rseq: Fix concurrency ID handling of usermodehelper kthreads 

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
This commit is contained in:
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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6
kernel/sched/core.c
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@ -11343,8 +11343,8 @@ void sched_mm_cid_after_execve(struct task_struct *t)
struct mm_struct *mm = t->mm;
unsigned long flags;
WARN_ON_ONCE((t->flags & PF_KTHREAD) || !t->mm);
if (!mm)
return;
local_irq_save(flags);
t->mm_cid = mm_cid_get(mm);
t->mm_cid_active = 1;
@ -11354,7 +11354,7 @@ void sched_mm_cid_after_execve(struct task_struct *t)
void sched_mm_cid_fork(struct task_struct *t)
{
WARN_ON_ONCE((t->flags & PF_KTHREAD) || !t->mm || t->mm_cid != -1);
WARN_ON_ONCE(!t->mm || t->mm_cid != -1);
t->mm_cid_active = 1;
}
#endif