linux-kernel - [PATCH] audit: correct a type mismatch in audit_syscall

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Message-Id: <1387938953-15667-1-git-send-email-takahiro.akashi@linaro.org>
Date:	Wed, 25 Dec 2013 11:35:53 +0900
From:	AKASHI Takahiro <takahiro.akashi@...aro.org>
To:	viro@...iv.linux.org.uk, eparis@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-audit@...hat.com,
	patches@...aro.org, dsaxena@...aro.org,
	AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [PATCH] audit: correct a type mismatch in audit_syscall_exit()

audit_syscall_exit() saves a result of regs_return_value() in intermediate
"int" variable and passes it to __audit_syscall_exit(), which expects its
second argument as a "long" value.
This will result in truncating the value returned by a system call and
making a wrong audit record.
I don't know why gcc compiler doesn't complain about this, but anyway it
causes a problem at runtime on arm64 (and probably most 64-bit archs).

Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
---
 include/linux/audit.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index c49a312..3dcb3f0 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -144,7 +144,7 @@ static inline void audit_syscall_exit(void *pt_regs)
 {
 	if (unlikely(current->audit_context)) {
 		int success = is_syscall_success(pt_regs);
-		int return_code = regs_return_value(pt_regs);
+		long return_code = regs_return_value(pt_regs);
 
 		__audit_syscall_exit(success, return_code);
 	}
-- 
1.7.9.5

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