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signal: Initialize the info in ksignal

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When handing the SIGNAL_GROUP_EXIT flag, the info in ksignal isn't cleared.
However, the info acquired by dequeue_synchronous_signal/dequeue_signal is
initialized and can be safely used. Fortunately, the fatal signal process
just uses the si_signo and doesn't use any other member. Even so, the
initialization before use is more safer.

Signed-off-by: haifeng.xu <haifeng.xu@shopee.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221128065606.19570-1-haifeng.xu@shopee.com
This commit is contained in:
haifeng.xu 2022-11-28 06:56:06 +00:00 committed by Kees Cook
parent 5abf698754
commit 3a017d6355
1 changed files with 1 additions and 0 deletions
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1
kernel/signal.c
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@ -2693,6 +2693,7 @@ relock:
/* Has this task already been marked for death? */
if ((signal->flags & SIGNAL_GROUP_EXIT) ||
signal->group_exec_task) {
clear_siginfo(&ksig->info);
ksig->info.si_signo = signr = SIGKILL;
sigdelset(&current->pending.signal, SIGKILL);
trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO,