[PATCH] audit: correct a type mismatch in audit_syscall_exit()

From: AKASHI Takahiro
Date: Tue Dec 24 2013 - 21:37:18 EST

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@xxxxxxxxxx>
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);

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