linux-kernel - [PATCH 04/22] signal: Ensure no siginfo union member increases the size of struct siginfo

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Date:   Mon, 15 Jan 2018 18:39:51 -0600
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-kernel@...r.kernel.org
Cc:     Al Viro <viro@...iv.linux.org.uk>, Oleg Nesterov <oleg@...hat.com>,
        linux-arch@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 04/22] signal: Ensure no siginfo union member increases the size of struct siginfo

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 kernel/signal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/signal.c b/kernel/signal.c
index 241d54958bbb..b9e5d825ee46 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3688,6 +3688,7 @@ void __init signals_init(void)
 	/* If this check fails, the __ARCH_SI_PREAMBLE_SIZE value is wrong! */
 	BUILD_BUG_ON(__ARCH_SI_PREAMBLE_SIZE
 		!= offsetof(struct siginfo, _sifields._pad));
+	BUILD_BUG_ON(sizeof(struct siginfo) != SI_MAX_SIZE);
 
 	sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
 }
-- 
2.14.1