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Date: Wed, 22 May 2019 19:39:12 -0500 From: "Eric W. Biederman" <ebiederm@...ssion.com> To: linux-kernel@...r.kernel.org Cc: "Eric W. Biederman" <ebiederm@...ssion.com>, Linux Containers <containers@...ts.linux-foundation.org>, Oleg Nesterov <oleg@...hat.com>, linux-arch@...r.kernel.org Subject: [REVIEW][PATCH 22/26] signal: Properly set TRACE_SIGNAL_LOSE_INFO in __send_signal Any time siginfo is not stored in the signal queue information is lost. Therefore set TRACE_SIGNAL_LOSE_INFO every time the code does not allocate a signal queue entry, and a queue overflow abort is not triggered. Fixes: ba005e1f4172 ("tracepoint: Add signal loss events") Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com> --- kernel/signal.c | 33 ++++++++++++++++----------------- 1 file changed, 16 insertions(+), 17 deletions(-) diff --git a/kernel/signal.c b/kernel/signal.c index d92b636b4e9d..b2f0cf3a68aa 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1131,23 +1131,22 @@ static int __send_signal(int sig, struct kernel_siginfo *info, struct task_struc copy_siginfo(&q->info, info); break; } - } else if (!is_si_special(info)) { - if (sig >= SIGRTMIN && info->si_code != SI_USER) { - /* - * Queue overflow, abort. We may abort if the - * signal was rt and sent by user using something - * other than kill(). - */ - result = TRACE_SIGNAL_OVERFLOW_FAIL; - ret = -EAGAIN; - goto ret; - } else { - /* - * This is a silent loss of information. We still - * send the signal, but the *info bits are lost. - */ - result = TRACE_SIGNAL_LOSE_INFO; - } + } else if (!is_si_special(info) && + sig >= SIGRTMIN && info->si_code != SI_USER) { + /* + * Queue overflow, abort. We may abort if the + * signal was rt and sent by user using something + * other than kill(). + */ + result = TRACE_SIGNAL_OVERFLOW_FAIL; + ret = -EAGAIN; + goto ret; + } else { + /* + * This is a silent loss of information. We still + * send the signal, but the *info bits are lost. + */ + result = TRACE_SIGNAL_LOSE_INFO; } out_set: -- 2.21.0
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