linux-kernel - [PATCH 3/3] prctl: allow to use PR_MM_SET

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Date:	Fri, 14 Feb 2014 18:13:29 +0400
From:	Andrey Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	criu@...nvz.org, Andrey Vagin <avagin@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Pavel Emelyanov <xemul@...allels.com>,
	Aditya Kali <adityakali@...gle.com>
Subject: [PATCH 3/3] prctl: allow to use PR_MM_SET_* which affect only a current task

Here are PR_SET_MM_*_CODE, PR_SET_MM_ARG_*, PR_SET_MM_ENV_*,
PR_SET_MM_AUXV.

Looks like all these parameters can break only the current task and
can not affect other tasks or limits.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Kees Cook <keescook@...omium.org>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Pavel Emelyanov <xemul@...allels.com>
Cc: Aditya Kali <adityakali@...gle.com>
Signed-off-by: Andrey Vagin <avagin@...nvz.org>
---
 kernel/sys.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index 2f0925d..154cf47 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1719,8 +1719,7 @@ static int prctl_set_mm(int opt, unsigned long addr,
 			if (!issecure(SECURE_SET_EXE_FILE))
 				return -EPERM;
 			break;
-		default:
-			return -EPERM;
+		/* Other options don't require special capabilities */
 		}
 	}
 
-- 
1.8.5.3

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