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Bug 1531168 - glibc: setcontext/makecontext alignment issues on x86
Summary: glibc: setcontext/makecontext alignment issues on x86
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: glibc
Version: 7.6
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Florian Weimer
QA Contact: Sergey Kolosov
URL:
Whiteboard:
Depends On:
Blocks: 1565233
TreeView+ depends on / blocked
 
Reported: 2018-01-04 17:43 UTC by Florian Weimer
Modified: 2018-10-30 09:37 UTC (History)
6 users (show)

Fixed In Version: glibc-2.17-241.el7
Doc Type: Bug Fix
Doc Text:
Cause: The glibc functions startcontext and makecontext did not properly maintain stack alignment on the x86 platforms (32-bit and 64-bit). Consequence: Recent GCC versions, including those which are available through Developer Toolset (DTS), generate code that assumes ABI-mandated stack alignment in more places, and applications which use these functions could crash as a result. Fix: The glibc implementation of startcontext and makecontext was adjusted to follow ABI stack alignment. Result: Applications compiled with recent GCC versions no longer crash due to a misaligned stack.
Clone Of:
Environment:
Last Closed: 2018-10-30 09:36:35 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:3092 0 None None None 2018-10-30 09:37:36 UTC
Sourceware 18635 0 None None None 2019-04-24 18:39:22 UTC
Sourceware 18661 0 None None None 2019-04-24 18:39:22 UTC
Sourceware 22667 0 None None None 2019-04-24 18:39:22 UTC

Description Florian Weimer 2018-01-04 17:43:23 UTC 
The makecontext family of functions has alignment issues on i386 and x86-64:

https://sourceware.org/bugzilla/show_bug.cgi?id=18661
  (the change to sysdeps/unix/sysv/linux/x86_64/__start_context.S)
https://sourceware.org/bugzilla/show_bug.cgi?id=22667

We should consider fixing this for the benefit of DTS-compiled code.
Comment 6 errata-xmlrpc 2018-10-30 09:36:35 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/RHSA-2018:3092
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