tree 26b9d37f5a41b4c01d800a444ad230eafb48e47a
parent b3b896c73b4b04b506816a09994192e3a54f0fef
author Richard Cochran <richardcochran@gmail.com> 1301931083 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1301931083 -0700

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>