linux-kernel - [patch] ADJ_OFFSET_SS

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Message-ID: <485E002B.5010101@gmail.com>
Date:	Sun, 22 Jun 2008 09:32:59 +0200
From:	Michael Kerrisk <mtk.manpages@...il.com>
To:	Michael Kerrisk <mtk.manpages@...il.com>
CC:	Roman Zippel <zippel@...ux-m68k.org>,
	lkml <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: [patch] ADJ_OFFSET_SS_READ and capabilities

Hi Roman, John,

ADJ_OFFSET_SS_READ is a read-only operation.  Therefore, it seems
reasonable not to require any capability (as is the case when 'modes'
is zero.  See the patch below.  Does this change seem reasonable?

Cheers,

Michael

--- linux-2.6.26-rc5/kernel/time/ntp.c	2008-06-13 11:16:51.000000000 +0200
+++ linux-2.6.26-rc5-p/kernel/time/ntp.c	2008-06-22 07:31:43.000000000 +0200
@@ -281,7 +281,8 @@
  	int result;

  	/* In order to modify anything, you gotta be super-user! */
-	if (txc->modes && !capable(CAP_SYS_TIME))
+	if (txc->modes && txc->modes != ADJ_OFFSET_SS_READ &&
+	    !capable(CAP_SYS_TIME))
  		return -EPERM;

  	/* Now we validate the data before disabling interrupts */


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