This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: [Y2038] Fifth draft of the Y2038 design document

From: Florian Weimer <fweimer at redhat dot com>
To: Joseph Myers <joseph at codesourcery dot com>, Albert ARIBAUD <albert dot aribaud at 3adev dot fr>
Cc: Arnd Bergmann <arnd at arndb dot de>, y2038 at lists dot linaro dot org, GNU C Library <libc-alpha at sourceware dot org>, Deepa Dinamani <deepa dot kernel at gmail dot com>
Date: Thu, 9 Mar 2017 09:34:48 +0100
Subject: Re: [Y2038] Fifth draft of the Y2038 design document
Authentication-results: sourceware.org; auth=none
References: <20170222090511.48be22ed.albert.aribaud@3adev.fr> <CAK8P3a2-vsreq0WFiTS-WizSvmci_C5f4pMAiYF7-OhjzQZiNg@mail.gmail.com> <alpine.DEB.2.20.1702222305450.24643@digraph.polyomino.org.uk> <CAK8P3a2nioXeVy+LnAz9wOObTQuD2kfJHUW-eb4=-tcohs43sQ@mail.gmail.com> <alpine.DEB.2.20.1702231726150.30491@digraph.polyomino.org.uk> <CAK8P3a3fFZBx-h=33an45dLVUqEq1eL9Gzu2zTRKQoZLSYKkzQ@mail.gmail.com> <20170227120204.5846d883.albert.aribaud@3adev.fr> <CAK8P3a07bk9j27kxbmtY=hZ=gffAOktsk91Gmo0YDq5DCdcBtw@mail.gmail.com> <alpine.DEB.2.20.1702271841060.12140@digraph.polyomino.org.uk> <CAK8P3a3vHecifoU_q17Xae2Pc8fu3qUOe9FH+HTKL17MhXU=Ag@mail.gmail.com> <20170227210620.3a8af1ce.albert.aribaud@3adev.fr> <CAK8P3a3sFdFVutFd=4JvP30QQDpOFPzE-1NeRnLJxk83MPispA@mail.gmail.com> <20170308112845.2dd88d86.albert.aribaud@3adev.fr> <alpine.DEB.2.20.1703082008180.1413@digraph.polyomino.org.uk>

On 03/08/2017 09:10 PM, Joseph Myers wrote:

On Wed, 8 Mar 2017, Albert ARIBAUD wrote:

IIUC, on the kernel side there is a will to move away from Posix (1)
here and just make tv_nsec 64-bits with no padding when time_t is
64-bit.


In that case, that simply means it's glibc's responsibility to avoid the
x32 mistake, and copy timespec values passed to the kernel to clear
padding while staying compatible with POSIX.  (Which would probably also
provide the infrastructure required to fix the x32 bug in glibc along the
lines used in musl.)

That's not going to work because struct timespec can be hidden in ioctlarguments, ancillary data (cmsg), and Netlink messages. It's an uphillbattle to lie to userspace about the kernel ABI, so we really shouldn'tdo that.


Thanks,
Florian

Follow-Ups:
- Re: [Y2038] Fifth draft of the Y2038 design document
  - From: Joseph Myers

References:
- Re: [Y2038] Fifth draft of the Y2038 design document
  - From: Albert ARIBAUD
- Re: [Y2038] Fifth draft of the Y2038 design document
  - From: Joseph Myers

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]