diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2025-09-22 15:47:00 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-10-29 10:29:54 +0100 |
| commit | ef1ea98c8fffe227e5319215d84a53fa2a4bcebc (patch) | |
| tree | 468dc5d84c7f850599920adf7de0610447da83c1 /kernel/exit.c | |
| parent | 34976eaf5f83d2bda76eeb54c5bbcafe87245e82 (diff) | |
task_work: Fix NMI race condition
__schedule()
// disable irqs
<NMI>
task_work_add(current, work, TWA_NMI_CURRENT);
</NMI>
// current = next;
// enable irqs
<IRQ>
task_work_set_notify_irq()
test_and_set_tsk_thread_flag(current,
TIF_NOTIFY_RESUME); // wrong task!
</IRQ>
// original task skips task work on its next return to user (or exit!)
Fixes: 466e4d801cd4 ("task_work: Add TWA_NMI_CURRENT as an additional notify mode.")
Reported-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://patch.msgid.link/20250924080118.425949403@infradead.org
Diffstat (limited to 'kernel/exit.c')
0 files changed, 0 insertions, 0 deletions