Bug 1293139 - Invalid memory access in getmntent_r()
Summary: Invalid memory access in getmntent_r()
Alias: None
Product: Fedora
Classification: Fedora
Component: glibc
Version: 23
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Florian Weimer
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2015-12-20 15:45 UTC by Jon Burgess
Modified: 2016-05-11 11:40 UTC (History)
8 users (show)

Fixed In Version: glibc-2.22-15.fc23
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2016-05-10 18:51:59 UTC
Type: Bug

Attachments (Terms of Use)
Test code from upstream bug report (110 bytes, text/x-csrc)
2015-12-20 15:45 UTC, Jon Burgess
no flags Details

System ID Private Priority Status Summary Last Updated
Sourceware 18887 0 None None None 2015-12-20 15:45:03 UTC

Description Jon Burgess 2015-12-20 15:45:03 UTC
Created attachment 1108003 [details]
Test code from upstream bug report

Description of problem: Running valgrind on any program using getmntent() shows an invalid memory access in getmntent_r(). The bug has been fixed in the upstream glibc.

Version-Release number of selected component (if applicable):

How reproducible:
Every time

Steps to Reproduce:
1. gcc test.c
2. valgrind ./a.out

Actual results:

==21800== Invalid read of size 1
==21800==    at 0x4F2EE74: getmntent_r (mntent_r.c:139)
==21800==    by 0x4005FC: main (in /home/jburgess/a.out)
==21800==  Address 0x51f62af is 1 bytes before a block of size 4,096 alloc'd
==21800==    at 0x4C28C50: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==21800==    by 0x4F2EC99: allocate (mntent.c:35)
==21800==    by 0x4F2EC99: getmntent (mntent.c:44)
==21800==    by 0x4005FC: main (in /home/jburgess/a.out)

Expected results:

Additional info:

Upstream glibc report: https://sourceware.org/bugzilla/show_bug.cgi?id=18887

Comment 1 Fedora Update System 2016-05-07 17:20:43 UTC
glibc-2.22-15.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2016-68abc0be35

Comment 2 Fedora Update System 2016-05-08 16:26:04 UTC
glibc-2.22-15.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-68abc0be35

Comment 3 Florian Weimer 2016-05-09 09:44:06 UTC
Already fixed upstream prior to the 2.23 release:

commit b0e805fa0d6fea33745952df7b7f5442ca4c374f
Author: Mike Frysinger <vapier>
Date:   Fri Aug 28 17:08:49 2015 -0400

    getmntent: fix memory corruption w/blank lines [BZ #18887]

Comment 4 Fedora Update System 2016-05-10 17:58:12 UTC
glibc-2.22-15.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

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