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Bug 1672771 - glibc: Missing robust mutex compiler barriers in pthread_mutex_trylock.c
Summary: glibc: Missing robust mutex compiler barriers in pthread_mutex_trylock.c
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: glibc
Version: 7.7
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Patsy Griffin
QA Contact: qe-baseos-tools-bugs
URL:
Whiteboard:
Depends On:
Blocks: 1672773 1710258
TreeView+ depends on / blocked
 
Reported: 2019-02-05 21:05 UTC by Carlos O'Donell
Modified: 2020-03-31 19:08 UTC (History)
8 users (show)

Fixed In Version: glibc-2.17-297.el7
Doc Type: No Doc Update
Doc Text:
Clone Of:
: 1672773 (view as bug list)
Environment:
Last Closed: 2020-03-31 19:08:32 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:0989 0 None None None 2020-03-31 19:08:51 UTC

Description Carlos O'Donell 2019-02-05 21:05:04 UTC 
There are 10 missing compiler barriers in pthread_mutex_trylock.c, which can under certain circumstances, allow an optimizing compiler to reorder stores such that the kernel can observe an inconsistent state in the robust list.

Stefan Liebler's (IBM) patch:
https://www.sourceware.org/ml/libc-alpha/2019-02/msg00129.html

My review:
https://www.sourceware.org/ml/libc-alpha/2019-02/msg00133.html

We should backport this to rhel-7.7, since in rhel-7.6 we did a lot of work to fix other robust mutex issues for the Samba team.
Comment 9 Sergey Kolosov 2019-12-04 20:35:32 UTC 
Verified by assembly reviewing
Comment 11 errata-xmlrpc 2020-03-31 19:08:32 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:0989
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