diff options
| author | Thomas Gleixner <tglx@kernel.org> | 2026-04-28 11:14:41 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-05-01 22:32:20 +0300 |
| commit | e9766e6f7d330dce7530918d8c6e3ec96d6c6e24 (patch) | |
| tree | 63950a6c65d7fdc0e67e06e3e2b7ed8fc3859e54 /include/linux | |
| parent | 2cb68e45120dfc66404c7547d95b8ac6ff0b25ce (diff) | |
| download | linux-e9766e6f7d330dce7530918d8c6e3ec96d6c6e24.tar.xz | |
rseq: Protect rseq_reset() against interrupts
rseq_reset() uses memset() to clear the tasks rseq data. That's racy
against membarrier() and preemption.
Guard it with irqsave to cure this.
Fixes: faba9d250eae ("rseq: Introduce struct rseq_data")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Link: https://patch.msgid.link/20260428224427.353887714%40kernel.org
Cc: stable@vger.kernel.org
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rseq.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/rseq.h b/include/linux/rseq.h index b9d62fc2140d..f446909551df 100644 --- a/include/linux/rseq.h +++ b/include/linux/rseq.h @@ -119,6 +119,8 @@ static inline void rseq_virt_userspace_exit(void) static inline void rseq_reset(struct task_struct *t) { + /* Protect against preemption and membarrier IPI */ + guard(irqsave)(); memset(&t->rseq, 0, sizeof(t->rseq)); t->rseq.ids.cpu_id = RSEQ_CPU_ID_UNINITIALIZED; } |