Bug 1037003

Summary: bombardier FTBFS if "-Werror=format-security" flag is used
Product: [Fedora] Fedora Reporter: Dhiru Kholia <dkholia>
Component: bombardierAssignee: Gwyn Ciesla <gwync>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: bressers, gwync
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OS: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2014-02-11 14:17:20 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Blocks: 1038083    

Description Dhiru Kholia 2013-12-03 02:53:56 UTC 
Description of problem
----------------------

bombardier fails to build if "-Werror=format-security" flag is used.

...

step.c:34:7: error: format not a string literal and no format arguments [-Werror=format-security]

...

We are working on a proposal to enable "-Werror=format-security" for all
packages. Once this flag is enabled, GCC will refuse to compile code that could
be vulnerable to a string format security flaw. For more details, please see
https://fedorahosted.org/fesco/ticket/1185 page.

To understand why it is important to fix this, please see
https://fedoraproject.org/wiki/Format-Security-FAQ page.

How to fix this
---------------

The fix for these errors is quite simple. It's a matter of changing a
line like,

   printf(foo);

to read,

   printf("%s", foo);

That's it.

Please fix this issue in rawhide with a patch (which you should submit
to upstream to merge moving forward). Please do a new build with the
fix in rawhide. Other releases do not need to be directly fixed, but
there should be no harm in pushing out this fix/patch with other needed
changes to those branches.

In the event you don't fix this bug before the next mass rebuild,
provenpackagers may step in and update your package(s) to fix this
issue.

How reproducible
----------------

Build bombardier-0.8.2.2-15.fc20.src.rpm with "-Werror=format-security" flag to reproduce the problem.

To make this process easier, you can use a modified "redhat-rpm-config" package
from http://people.fedoraproject.org/~halfie/artifacts/redhat-rpm-config/ URL.

$ sha256sum redhat-rpm-config-9.1.0-56.fc20.*
faad7594b2080fe76497d0ce50808c905a93dd7b41c1defdde5ca57e3833d3d2  redhat-rpm-config-9.1.0-56.fc20.noarch.rpm
5aa9357174305c7285ffdbc92d7ffe1c07a8a95d5459b930461308f5aad75413  redhat-rpm-config-9.1.0-56.fc20.src.rpm
Comment 1 Gwyn Ciesla 2013-12-03 13:32:35 UTC 
I don't see any printf calls in bombardier, just fprintf, sprintf, and asprintf.  Does this apply to these as well?
Comment 2 Dhiru Kholia 2013-12-03 15:59:43 UTC 
(In reply to Jon Ciesla from comment #1)
> I don't see any printf calls in bombardier, just fprintf, sprintf, and
> asprintf.  Does this apply to these as well?

Yes, it does. 

From the man page, "... If -Wformat is specified, also warn about uses of format functions that represent possible security problems." - the keyword here is "format functions".
Comment 3 Gwyn Ciesla 2013-12-03 16:04:53 UTC 
Ok, thanks for the clarification.
Comment 4 Gwyn Ciesla 2014-02-11 14:17:20 UTC 
Fixed in rawhide.