From: Richard Cochran <richardcochran@gmail.com>
Date: Mon, 4 Apr 2011 15:31:23 +0000 (-0700)
Subject: ntp: fix non privileged system time shifting
X-Git-Tag: v2.6.39-rc2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4352d9d44b935e4d000be6ec89ddb55c2bf35f24;p=pandora-kernel.git

ntp: fix non privileged system time shifting

The ADJ_SETOFFSET bit added in commit 094aa188 ("ntp: Add ADJ_SETOFFSET
mode bit") also introduced a way for any user to change the system time.
Sneaky or buggy calls to adjtimex() could set

    ADJ_OFFSET_SS_READ | ADJ_SETOFFSET

which would result in a successful call to timekeeping_inject_offset().
This patch fixes the issue by adding the capability check.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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