linux-kernel - Re: LTP and commit e1d7ba8735551ed7 ("time: Always make sure wall_to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 15 Sep 2015 10:37:29 +0200
From:	Cyril Hrubis <chrubis@...e.cz>
To:	Mark Rutland <mark.rutland@....com>
Cc:	John Stultz <john.stultz@...aro.org>,
	Wang YanQing <udknight@...il.com>, ltp@...ts.linux.it,
	will.deacon@....com, linux-kernel@...r.kernel.org
Subject: Re: LTP and commit e1d7ba8735551ed7 ("time: Always make sure
 wall_to_monotonic isn't positive")

Hi!
> While testing v4.3-rc1 with the LTP, we spotted failures in a couple of
> timekeeping tests, which seem to be a result of commit e1d7ba8735551ed7
> ("time: Always make sure wall_to_monotonic isn't positive").
> 
> In both cases this is because the new time would be before the boot
> time, so I guess these are covered by the caveat at the end of the
> commit message.
> 
> settimeofday01 [1] tries tries to settimeofday() with a timeval 100s and
> 100ns, while clock_gettime02 [2] tries to clock_settime to 1s and
> 100ns. Neither expect -EINVAL, and report failure with the new
> behaviour.
> 
> While I don't know that any "real" software is affected, I thought I
> should let you know.

Thanks for the report, we allready have patch for the first testcase on
the mailing list that initializes the the timeval value to current time
+ small amount. I will have a look at the second test as well.

> [1] https://github.com/linux-test-project/ltp/blob/20150903/testcases/kernel/syscalls/settimeofday/settimeofday01.c
> [2] https://github.com/linux-test-project/ltp/blob/20150903/testcases/kernel/timers/clock_settime/clock_settime02.c

-- 
Cyril Hrubis
chrubis@...e.cz
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/