linux-kernel - [PATCH 7/9] oom: unify CAP_SYS_RAWIO check into other superuser check

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Message-Id: <20100616203404.72E9.A69D9226@jp.fujitsu.com>
Date:	Wed, 16 Jun 2010 20:34:43 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH 7/9] oom: unify CAP_SYS_RAWIO check into other superuser check


Now, CAP_SYS_RAWIO check is very strange. if the user have both
CAP_SYS_ADMIN and CAP_SYS_RAWIO, points will makes 1/16.

Superuser's 1/4 bonus worthness is quite a bit dubious, but
considerable. However 1/16 is obviously insane.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/oom_kill.c |   17 ++++++-----------
 1 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index e4b1146..4236d39 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -198,19 +198,14 @@ unsigned long oom_badness(struct task_struct *p, unsigned long uptime)
 
 	/*
 	 * Superuser processes are usually more important, so we make it
-	 * less likely that we kill those.
+	 * less likely that we kill those. And we don't want to kill a
+	 * process with direct hardware access. Not only could that mess
+	 * up the hardware, but usually users tend to only have this
+	 * flag set on applications they think of as important.
 	 */
 	if (has_capability_noaudit(p, CAP_SYS_ADMIN) ||
-	    has_capability_noaudit(p, CAP_SYS_RESOURCE))
-		points /= 4;
-
-	/*
-	 * We don't want to kill a process with direct hardware access.
-	 * Not only could that mess up the hardware, but usually users
-	 * tend to only have this flag set on applications they think
-	 * of as important.
-	 */
-	if (has_capability_noaudit(p, CAP_SYS_RAWIO))
+	    has_capability_noaudit(p, CAP_SYS_RESOURCE) ||
+	    has_capability_noaudit(p, CAP_SYS_RAWIO))
 		points /= 4;
 
 	/*
-- 
1.6.5.2



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