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Bug 1579739

Summary: glibc: Fix stack overflow with huge PT_NOTE segment
Product: Red Hat Enterprise Linux 7 Reporter: Florian Weimer <fweimer>
Component: glibcAssignee: Florian Weimer <fweimer>
Status: CLOSED ERRATA QA Contact: qe-baseos-tools-bugs
Severity: low Docs Contact:
Priority: low    
Version: 7.5CC: ashankar, codonell, dj, fweimer, mcermak, mnewsome, pfrankli, skolosov
Target Milestone: rcKeywords: Patch
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: glibc-2.17-281.el7 Doc Type: No Doc Update
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-08-06 12:48:58 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1655768    

Description Florian Weimer 2018-05-18 08:36:01 UTC
Certain Rust binaries used to trigger this (but Rust has since installed a workaround).  Upstream fix:

Upstream fix:

commit 0065aaaaae51cd60210ec3a7e13dddd8e01ffe2c
Author: Paul Pluzhnikov <ppluzhnikov>
Date:   Sat May 5 18:08:27 2018 -0700

    Fix BZ 20419.  A PT_NOTE in a binary could be arbitratily large, so using
    alloca for it may cause stack overflow.  If the note is larger than
    __MAX_ALLOCA_CUTOFF, use dynamically allocated memory to read it in.

Comment 3 Florian Weimer 2019-03-01 14:30:27 UTC
Note to QE: The test case needs improvement, and I posted a patch upstream:

https://sourceware.org/ml/libc-alpha/2019-03/msg00011.html

I will backport this test adjustment once it has been approved upstream.

Comment 4 Florian Weimer 2019-03-01 18:08:52 UTC
glibc-2.17-283.el7 has the test improvement from upstream.

Comment 6 Sergey Kolosov 2019-06-10 12:03:50 UTC
Verified with elf/tst-big-note glibc test case.

Comment 8 errata-xmlrpc 2019-08-06 12:48:58 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-2019:2118