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
| ||
|
Date: Thu, 4 Feb 2016 10:01:31 +0100 From: Ilya Dryomov <idryomov@...il.com> To: Arnd Bergmann <arnd@...db.de> Cc: "Yan, Zheng" <zyan@...hat.com>, Deepa Dinamani <deepa.kernel@...il.com>, Zheng Yan <ukernel@...il.com>, linux-fsdevel@...r.kernel.org, y2038@...ts.linaro.org, Dave Chinner <david@...morbit.com>, "Theodore Ts'o" <tytso@....edu>, linux-kernel <linux-kernel@...r.kernel.org>, Sage Weil <sage@...hat.com>, ceph-devel <ceph-devel@...r.kernel.org> Subject: Re: [PATCH 09/10] fs: ceph: Replace CURRENT_TIME by ktime_get_real_ts() On Thu, Feb 4, 2016 at 9:30 AM, Arnd Bergmann <arnd@...db.de> wrote: > On Thursday 04 February 2016 10:00:19 Yan, Zheng wrote: >> > On Feb 4, 2016, at 05:27, Arnd Bergmann <arnd@...db.de> wrote: >> { >> struct ceph_timespec ts; >> ceph_encode_timespec(&ts, &req->r_stamp); >> ceph_encode_copy(&p, &ts, sizeof(ts)); >> } > > Ok, that does make the behavior consistent on all architectures, but > leads to a different question: > > struct ceph_timespec { > __le32 tv_sec; > __le32 tv_nsec; > } __attribute__ ((packed)); > > How do you define ceph_timespec, is tv_sec supposed to be signed or unsigned? > > It seems that you treat it as signed, meaning you interpret times > from the server as being in the [1902..2038] range, rather than the > [1970..2106] range: > > static inline void ceph_decode_timespec(struct timespec *ts, > const struct ceph_timespec *tv) > { > ts->tv_sec = (__kernel_time_t)le32_to_cpu(tv->tv_sec); > ts->tv_nsec = (long)le32_to_cpu(tv->tv_nsec); > } > > Is that intentional and documented? If yes, what is your plan to deal > with y2038 support? tv_sec is used as a time_t, so signed. The problem is that ceph_timespec is not only passed over the wire, but is also stored on disk, part of quite a few other data structures. The plan is to eventually switch to a 64-bit tv_sec and tv_nsec, bump the version on all the structures that contain it and add a cluster-wide feature bit to deal with older clients. We've recently had a discussion about this, so it may even happen in a not so distant future, but no promises ;) Thanks, Ilya
Powered by blists - more mailing lists