linux-kernel - [PATCH] prctl: Use CAP_SYS_RESOUCE for PR_SET

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Message-ID: <20120307125217.GC20558@moon>
Date:	Wed, 7 Mar 2012 16:52:17 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Michael Kerrisk <mtk.manpages@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Kees Cook <keescook@...omium.org>
Subject: [PATCH] prctl: Use CAP_SYS_RESOUCE for PR_SET_MM option

CAP_SYS_ADMIN is already overloaded left and right,
so to have more finegrained access control use
CAP_SYS_RESOUCE here.

The CAP_SYS_RESOUCE is chosen because this prctl
option allows a current process to adjust some
fields of memory map descriptor which rather
represent what the process owns: pointers to
code, data, stack segments, command line,
auxilary vector data and etc.

Suggested-by: Michael Kerrisk <mtk.manpages@...il.com>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Pavel Emelyanov <xemul@...allels.com>
CC: Tejun Heo <tj@...nel.org>
CC: Oleg Nesterov <oleg@...hat.com>
CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Kees Cook <keescook@...omium.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
---
 kernel/sys.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.git/kernel/sys.c
===================================================================
--- linux-2.6.git.orig/kernel/sys.c
+++ linux-2.6.git/kernel/sys.c
@@ -1712,7 +1712,7 @@ static int prctl_set_mm(int opt, unsigne
 	if (arg5 || (arg4 && opt != PR_SET_MM_AUXV))
 		return -EINVAL;
 
-	if (!capable(CAP_SYS_ADMIN))
+	if (!capable(CAP_SYS_RESOURCE))
 		return -EPERM;
 
 	if (addr >= TASK_SIZE)
--
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