linux-kernel - [PATCH] seccomp: Fix resetting filter count at seccomp_sync

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Message-Id: <20210304233708.420597-1-hsuanchikuo@gmail.com>
Date:   Thu,  4 Mar 2021 17:37:08 -0600
From:   Hsuan-Chi Kuo <hsuanchikuo@...il.com>
To:     keescook@...omium.org
Cc:     hsuanchikuo@...il.com, Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] seccomp: Fix resetting filter count at seccomp_sync_threads()

The desired behavior is to set the caller's filter count to thread's.

Signed-off-by: Hsuan-Chi Kuo <hsuanchikuo@...il.com>
---
 kernel/seccomp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 1d60fc2c99..3dde1aa173 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -597,7 +597,7 @@ static inline void seccomp_sync_threads(unsigned long flags)
 		smp_store_release(&thread->seccomp.filter,
 				  caller->seccomp.filter);
 		atomic_set(&thread->seccomp.filter_count,
-			   atomic_read(&thread->seccomp.filter_count));
+			   atomic_read(&caller->seccomp.filter_count));
 
 		/*
 		 * Don't let an unprivileged task work around
-- 
2.30.1