From: Carlos O'Donell <carlos@redhat.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Florian Weimer <fweimer@redhat.com>,
"Senkevich, Andrew" <andrew.senkevich@intel.com>,
Andreas Schwab <schwab@suse.de>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH] Revert Intel CET changes to __jmp_buf_tag (Bug 22743)
Date: Thu, 25 Jan 2018 16:37:00 -0000 [thread overview]
Message-ID: <79fdc0dd-4f85-45fb-0ff7-715c9bed3f74@redhat.com> (raw)
In-Reply-To: <CAMe9rOpxvMqLeOEMOJHsVN5pQFbg6TuWQwzpkqFN7Eab4qGzwg@mail.gmail.com>
On 01/24/2018 09:33 PM, H.J. Lu wrote:
> On Wed, Jan 24, 2018 at 8:53 PM, Carlos O'Donell <carlos@redhat.com> wrote:
>> On 01/24/2018 05:48 PM, Dmitry V. Levin wrote:
>>> I'm afraid by Monday it will be too late for 2.27 as we will get very
>>> little testing before the release.
>> Before reverting:
>>
>> [carlos@athas tst-cleanup1]$ /home/carlos/build/glibc/elf/ld.so --library-path /home/carlos/build/glibc:/home/carlos/build/glibc/elf:/home/carlos/build/glibc/dlfcn:/home/carlos/build/glibc/nptl ./tst-cleanup1
>> ch (3)
>> ch (2)
>> ch (1)
>> Didn't expect signal from child: got `Segmentation fault'
>>
>> After reverting:
>>
>> [carlos@athas tst-cleanup1]$ /home/carlos/build/glibc-reverted/elf/ld.so --library-path /home/carlos/build/glibc-reverted:/home/carlos/build/glibc-reverted/elf:/home/carlos/build/glibc-reverted/dlfcn:/home/carlos/build/glibc-reverted/nptl ./tst-cleanup1
>> ch (3)
>> ch (2)
>> ch (1)
>>
>> ~~~ Commit message ~~~
>> In commit cba595c350e52194e10c0006732e1991e3d0803b and commit
>> f81ddabffd76ac9dd600b02adbf3e1dac4bb10ec, ABI compatibility with
>> applications was broken by increasing the size of the on-stack
>> allocated __pthread_unwind_buf_t beyond the oringal size.
>> Applications only have the origianl space available for
>> __pthread_unwind_register, and __pthread_unwind_next to use,
>> any increase in the size of __pthread_unwind_buf_t causes these
>> functions to write beyond the original structure into other
>> on-stack variables leading to segmentation faults in common
>> applications like vlc. The only workaround is to version those
>> functions which operate on the old sized objects, but this must
>> happen in glibc 2.28.
>>
>> Thank you to Andrew Senkevich, H.J. Lu, and Aurelien Jarno, for
>> submitting reports and tracking the issue down.
>>
>> The commit reverts the above mentioned commits and testing on
>> x86_64 shows that the ABI compatibility is restored. A tst-cleanup1
>> regression test linked with an older glibc now passes when run
>> with the newly built glibc. Previously a tst-cleanup1 linked with
>> an older glibc would segfault when run with an affected glibc build.
>>
>> Tested on x86_64 with no regressions.
>>
>> Signed-off-by: Carlos O'Donell <carlos@redhat.com>
>> ~~~
>>
>> Patch attached.
>>
>> OK to commit?
>>
>> This fixes the last blocker for glibc 2.27.
>
> Please don't revert my patch. Please try this patch:
>
> https://sourceware.org/git/?p=glibc.git;a=commit;h=4b7fc470a6740808b41502d7431f91805e272d26
>
> instead. I will clean it up and submit it tomorrow.
This is unacceptable. It adds a new symbol version and we froze the
ABI at the start of the month. You cannot work these fixes into 2.27
with a new symbol version, it must wait for 2.28.
--
Cheers,
Carlos.
next prev parent reply other threads:[~2018-01-25 16:37 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-07 17:41 [PATCH 1/2] Linux/x86: Update cancel_jmp_buf to match __jmp_buf_tag [BZ #22563] H.J. Lu
2017-12-07 17:58 ` Joseph Myers
2017-12-07 18:37 ` Florian Weimer
2017-12-07 18:59 ` H.J. Lu
2017-12-07 19:09 ` Florian Weimer
2017-12-07 19:12 ` H.J. Lu
2017-12-07 19:14 ` Florian Weimer
2017-12-07 19:19 ` H.J. Lu
2017-12-07 19:25 ` Florian Weimer
2017-12-07 19:35 ` H.J. Lu
2017-12-08 2:25 ` H.J. Lu
2017-12-14 13:06 ` H.J. Lu
2017-12-15 17:43 ` H.J. Lu
2017-12-18 10:25 ` Florian Weimer
2017-12-18 11:42 ` H.J. Lu
2017-12-18 11:49 ` Florian Weimer
2017-12-18 12:25 ` H.J. Lu
2017-12-18 12:52 ` Florian Weimer
2017-12-18 13:19 ` H.J. Lu
2017-12-18 14:13 ` H.J. Lu
2017-12-18 14:45 ` Andreas Schwab
2017-12-18 14:48 ` H.J. Lu
2017-12-18 16:29 ` H.J. Lu
2018-01-09 10:47 ` Florian Weimer
2018-01-09 12:17 ` H.J. Lu
2018-01-09 16:20 ` Senkevich, Andrew
2018-01-21 16:16 ` Aurelien Jarno
2018-01-21 16:27 ` H.J. Lu
2018-01-21 16:50 ` Carlos O'Donell
2018-01-22 14:44 ` Senkevich, Andrew
2018-01-23 19:35 ` Carlos O'Donell
2018-01-23 21:13 ` Senkevich, Andrew
2018-01-24 18:08 ` H.J. Lu
2018-01-24 18:23 ` Florian Weimer
2018-01-25 0:32 ` Carlos O'Donell
2018-01-25 0:56 ` Joseph Myers
2018-01-25 1:09 ` H.J. Lu
2018-01-25 1:44 ` Carlos O'Donell
2018-01-25 1:48 ` Dmitry V. Levin
2018-01-25 4:53 ` [PATCH] Revert Intel CET changes to __jmp_buf_tag (Bug 22743) Carlos O'Donell
2018-01-25 5:33 ` H.J. Lu
2018-01-25 9:47 ` Florian Weimer
2018-01-25 12:38 ` H.J. Lu
2018-01-25 12:50 ` Florian Weimer
2018-01-25 13:00 ` H.J. Lu
2018-01-25 14:56 ` Zack Weinberg
2018-01-25 15:33 ` H.J. Lu
2018-01-25 16:22 ` Zack Weinberg
2018-01-25 16:28 ` H.J. Lu
2018-01-25 16:36 ` Carlos O'Donell
2018-01-25 16:40 ` H.J. Lu
2018-01-25 16:46 ` Carlos O'Donell
2018-01-25 17:01 ` H.J. Lu
2018-01-26 7:46 ` Carlos O'Donell
2018-01-28 18:40 ` H.J. Lu
2018-01-25 16:47 ` Florian Weimer
2018-01-25 16:55 ` H.J. Lu
2018-01-25 18:26 ` Joseph Myers
2018-01-25 19:21 ` H.J. Lu
2018-01-25 16:37 ` Carlos O'Donell [this message]
2018-01-25 16:38 ` Florian Weimer
2017-12-18 17:37 ` [PATCH 1/2] Linux/x86: Update cancel_jmp_buf to match __jmp_buf_tag [BZ #22563] Joseph Myers
2017-12-18 21:19 ` H.J. Lu
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