linux-kernel - [PATCH 5/9] signal/group_exit: Use start_group_exit in place of do_group

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Date:   Thu, 24 Jun 2021 14:01:40 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Michael Schmitz <schmitzmic@...il.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>, Oleg Nesterov <oleg@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        alpha <linux-alpha@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Tejun Heo <tj@...nel.org>, Kees Cook <keescook@...omium.org>
Subject: [PATCH 5/9] signal/group_exit: Use start_group_exit in place of do_group_exit


Make thread exiting uniform by causing all threads to pass through
get_signal when they are exiting.  This simplifies the analysis
of sychronization during exit and guarantees that all full set
of registers will be available for ptrace to examine for
threads that stop at PTRACE_EVENT_EXIT.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 kernel/exit.c    | 4 ++--
 kernel/seccomp.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index fd1c04193e18..921519d80b56 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -931,8 +931,8 @@ do_group_exit(int exit_code)
  */
 SYSCALL_DEFINE1(exit_group, int, error_code)
 {
-	do_group_exit((error_code & 0xff) << 8);
-	/* NOTREACHED */
+	start_group_exit((error_code & 0xff) << 8);
+	/* get_signal will call do_exit */
 	return 0;
 }
 
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 5301eca670a0..b1c06fd1b205 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -1250,7 +1250,7 @@ static int __seccomp_filter(int this_syscall, const struct seccomp_data *sd,
 			if (action == SECCOMP_RET_KILL_THREAD)
 				do_exit(SIGSYS);
 			else
-				do_group_exit(SIGSYS);
+				start_group_exit(SIGSYS);
 		}
 		return -1;
 	}
-- 
2.20.1