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From:   ebiederm@xmission.com (Eric W. Biederman)
To:     Linus Torvalds <torvalds@linux-foundation.org>
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Date:   Thu, 24 Jun 2021 14:03:50 -0500
In-Reply-To: <875yy3850g.fsf_-_@disp2133> (Eric W. Biederman's message of
        "Thu, 24 Jun 2021 13:57:35 -0500")
Message-ID: <87k0mj5bl5.fsf_-_@disp2133>
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Subject: [PATCH 9/9] signal: Move PTRACE_EVENT_EXIT into get_signal
Precedence: bulk


This ensures that we always have all full set of registers available when
PTRACE_EVENT_EXIT is called.  Something that is not guaranteed for callers
of do_exit.

Additionally this guarantees PTRACE_EVENT_EXIT will not cause havoc
with abnormal exits.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
 kernel/exit.c   | 2 --
 kernel/signal.c | 2 ++
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index 51e0c82b3f7d..309f1d71e340 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -763,8 +763,6 @@ void __noreturn do_exit(long code)
 	profile_task_exit(tsk);
 	kcov_task_exit(tsk);
 
-	ptrace_event(PTRACE_EVENT_EXIT, code);
-
 	validate_creds_for_do_exit(tsk);
 
 	/*
diff --git a/kernel/signal.c b/kernel/signal.c
index 63fda9b6bbf9..7214331836bc 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2890,6 +2890,8 @@ bool get_signal(struct ksignal *ksig)
 		if (exit_code & 0x7f)
 			current->flags |= PF_SIGNALED;
 
+		ptrace_event(PTRACE_EVENT_EXIT, exit_code);
+
 		/*
 		 * PF_IO_WORKER threads will catch and exit on fatal signals
 		 * themselves. They have cleanup that must be performed, so
-- 
2.20.1