Note: This is a public test instance of Red Hat Bugzilla. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback at bugzilla.redhat.com.
Bug 1032523 - libbsd: fortify support for string functions
Summary: libbsd: fortify support for string functions
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: libbsd
Version: rawhide
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Eric Smith
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: 1032518 1731545
TreeView+ depends on / blocked
 
Reported: 2013-11-20 10:54 UTC by Florian Weimer
Modified: 2022-11-16 18:53 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-07-19 20:51:29 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)

Description Florian Weimer 2013-11-20 10:54:10 UTC 
All str* and wide string functions which take char * arguments should have _FORTIFY_SOURCE=2 support (wrappers that tell GCC to supply buffer size information obtained using __builtin_object_size).  This includes strlcpy, strvis and wcslcpy, for example.
Comment 2 Eric Smith 2013-12-17 05:29:36 UTC 
It is unclear to me how FORTIFY_SOURCE will help strlcpy and wcslcpy, since they are by definition immune to the sort of problems that FORTIFY_SOURCE protects against. I can imagine FORTIFY_SOURCE being useful with other string functions.

In any case, is there documentation somewhere on how to add FORTIFY_SOURCE support in cases like this? My searches only turn up how to take advantage of FORTIFY_SOURCE in code that calls string functions, which isn't what I need here.
Comment 3 Lukáš Tinkl 2014-01-27 13:29:26 UTC 
Closing as fixed as the current snapshot trees also don't require nor contain libbsd anymore.
Comment 4 Florian Weimer 2014-01-27 13:38:22 UTC 
opendkim has now a build-requirement on libbsd-devel.
Comment 5 Florian Weimer 2014-11-11 11:11:01 UTC 
(In reply to Eric Smith from comment #2)
> It is unclear to me how FORTIFY_SOURCE will help strlcpy and wcslcpy, since
> they are by definition immune to the sort of problems that FORTIFY_SOURCE
> protects against. I can imagine FORTIFY_SOURCE being useful with other
> string functions.

We have seen cases where the user-supplied size is incorrect and the compiler knows better.

> In any case, is there documentation somewhere on how to add FORTIFY_SOURCE
> support in cases like this? My searches only turn up how to take advantage
> of FORTIFY_SOURCE in code that calls string functions, which isn't what I
> need here.

_FORTIFY_SOURCE uses __builtin_object_size from GCC, which is documented in the GCC manual.

I'll revive this glibc patch soon.  If it is accepted, the definitions can eventually be removed from libbsd:

  <https://sourceware.org/ml/libc-alpha/2014-09/msg00426.html>
Comment 6 Jaroslav Reznik 2015-03-03 15:13:11 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora 22 development cycle.
Changing version to '22'.

More information and reason for this action is here:
https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora22
Comment 7 Fedora End Of Life 2016-07-19 20:51:29 UTC 
Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
are unable to reopen this bug, please file a new report against the
current release. If you experience problems, please add a comment to this
bug.

Thank you for reporting this bug and we are sorry it could not be fixed.
Comment 8 Conrad Meyer 2017-07-21 00:43:57 UTC 
Did your strlcpy patch ever make it into glibc, Florian?
Comment 9 Florian Weimer 2017-07-21 08:32:16 UTC 
(In reply to Conrad Meyer from comment #8)
> Did your strlcpy patch ever make it into glibc, Florian?

Not yet.  Still working on it.
Comment 10 Conrad Meyer 2018-06-21 16:32:42 UTC 
Any update?  Should we patch libbsd to use FORTIFY_SOURCE in the interim?
Note You need to log in before you can comment on or make changes to this bug.