linux-kernel - [PATCH 1/2] kernel/sys.c: return the current uid when error occurs

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Date:	Tue, 06 Aug 2013 16:15:57 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Kees Cook <keescook@...omium.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>, holt@....com
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2]  kernel/sys.c: return the current uid when error occurs

According to the API definition, when error occurs, need return current
fsuid instead of the previous one.

The related informations ("man setfsuid"):

  RETURN VALUE
         On success, the previous value of fsuid is returned.  On error, the current value of fsuid is returned.


Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 kernel/sys.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index 771129b..558ccdb 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -736,11 +736,11 @@ SYSCALL_DEFINE1(setfsuid, uid_t, uid)
 
 	kuid = make_kuid(old->user_ns, uid);
 	if (!uid_valid(kuid))
-		return old_fsuid;
+		return uid;
 
 	new = prepare_creds();
 	if (!new)
-		return old_fsuid;
+		return uid;
 
 	if (uid_eq(kuid, old->uid)  || uid_eq(kuid, old->euid)  ||
 	    uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) ||
@@ -753,7 +753,7 @@ SYSCALL_DEFINE1(setfsuid, uid_t, uid)
 	}
 
 	abort_creds(new);
-	return old_fsuid;
+	return uid;
 
 change_okay:
 	commit_creds(new);
-- 
1.7.7.6
--
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