From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Kees Cook <keescook@chromium.org>,
Andy Lutomirski <luto@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Paul Bolle <pebolle@tiscali.nl>
Subject: Re: [5.2 REGRESSION] Generic vDSO breaks seccomp-enabled userspace on i386
Date: Fri, 26 Jul 2019 11:01:03 -0700 [thread overview]
Message-ID: <20190726180103.GE3188@linux.intel.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1907240155080.2034@nanos.tec.linutronix.de>
+cc Paul
On Wed, Jul 24, 2019 at 01:56:34AM +0200, Thomas Gleixner wrote:
> On Tue, 23 Jul 2019, Kees Cook wrote:
>
> > On Wed, Jul 24, 2019 at 12:59:03AM +0200, Thomas Gleixner wrote:
> > > And as we have sys_clock_gettime64() exposed for 32bit anyway you need to
> > > deal with that in seccomp independently of the VDSO. It does not make sense
> > > to treat sys_clock_gettime() differently than sys_clock_gettime64(). They
> > > both expose the same information, but the latter is y2038 safe.
> >
> > Okay, so combining Andy's ideas on aliasing and "more seccomp flags",
> > we could declare that clock_gettime64() is not filterable on 32-bit at
> > all without the magic SECCOMP_IGNORE_ALIASES flag or something. Then we
> > would alias clock_gettime64 to clock_gettime _before_ the first evaluation
> > (unless SECCOMP_IGNORE_ALIASES is set)?
> >
> > (When was clock_gettime64() introduced? Is it too long ago to do this
> > "you can't filter it without a special flag" change?)
>
> clock_gettime64() and the other sys_*time64() syscalls which address the
> y2038 issue were added in 5.1
Paul Bolle pointed out that this regression showed up in v5.3-rc1, not
v5.2. In Paul's case, systemd-journal is failing.
next prev parent reply other threads:[~2019-07-26 18:01 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-19 17:03 [5.2 REGRESSION] Generic vDSO breaks seccomp-enabled userspace on i386 Sean Christopherson
2019-07-19 17:40 ` Andy Lutomirski
2019-07-22 17:16 ` Kees Cook
2019-07-22 18:31 ` Thomas Gleixner
2019-07-22 18:39 ` Kees Cook
2019-07-22 19:17 ` Andy Lutomirski
2019-07-22 23:28 ` Kees Cook
2019-07-22 23:47 ` Andy Lutomirski
2019-07-23 9:18 ` Peter Zijlstra
2019-07-23 14:04 ` Andy Lutomirski
2019-07-23 15:14 ` Peter Zijlstra
2019-07-23 21:55 ` Kees Cook
2019-07-23 22:55 ` Andy Lutomirski
2019-07-23 22:59 ` Thomas Gleixner
2019-07-23 23:43 ` Kees Cook
2019-07-23 23:56 ` Thomas Gleixner
2019-07-26 18:01 ` Sean Christopherson [this message]
2019-07-27 17:49 ` Andy Lutomirski
2019-07-27 18:43 ` Thomas Gleixner
2019-07-27 21:52 ` Thomas Gleixner
2019-07-28 0:33 ` Andy Lutomirski
2019-07-28 9:57 ` Arnd Bergmann
2019-07-28 10:30 ` Thomas Gleixner
2019-07-28 15:27 ` Arnd Bergmann
2019-07-28 18:14 ` Thomas Gleixner
2019-07-28 18:16 ` Thomas Gleixner
2019-07-28 11:13 ` Thomas Gleixner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190726180103.GE3188@linux.intel.com \
--to=sean.j.christopherson@intel.com \
--cc=keescook@chromium.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=pebolle@tiscali.nl \
--cc=tglx@linutronix.de \
--cc=vincenzo.frascino@arm.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox