linux-kernel - [PATCH v2] kernel: arg2 is unsigned long which is never

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Date:	Sat, 16 Feb 2013 12:13:41 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] kernel: arg2 is unsigned long which is never < 0


  arg2 will never < 0, for its type is 'unsigned long'

  so need beautify the relative source code (better to use macros).

Reported-by: Cyrill Gorcunov <gorcunov@...nvz.org>
Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 kernel/sys.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index 24d1ef5..eebaf8d 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -47,6 +47,7 @@
 #include <linux/syscalls.h>
 #include <linux/kprobes.h>
 #include <linux/user_namespace.h>
+#include <linux/binfmts.h>
 
 #include <linux/kmsg_dump.h>
 /* Move somewhere else to avoid recompiling? */
@@ -2027,7 +2028,8 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
 			error = get_dumpable(me->mm);
 			break;
 		case PR_SET_DUMPABLE:
-			if (arg2 < 0 || arg2 > 1) {
+			if (arg2 != SUID_DUMP_DISABLE &&
+			    arg2 != SUID_DUMP_USER) {
 				error = -EINVAL;
 				break;
 			}
-- 
1.7.7.6
--
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