Andrew Deason 128772e328 cf: Undef _FORTIFY_SOURCE for use-after-free check
Commit f2003ed68c (gcc: Avoid false positive use-after-free in crypto)
added a configure check to detect whether the compiler we're using
exhibits the use-after-free warning bug. We add -O0 to CFLAGS for the
test to make sure the bug triggers for gcc 12, but if the user has
specified, for example, CFLAGS=-D_FORTIFY_SOURCE=1, this causes
the compile check to always fail:

    /usr/include/features.h:330:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
     #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)

This causes _OPENAFS_UAF_COMPILE_IFELSE to always fail, and so we
throw an AC_MSG_ERROR during configure.

To allow the build to continue with _FORTIFY_SOURCE, make sure
_FORTIFY_SOURCE is undefined for this specific test. The compile test
can then succeed with -O0 (unless we trigger the use-after-free bug,
of course).

Reviewed-on: https://gerrit.openafs.org/15499
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit 2e6b80e4bcdb476e95c8cff46ebaae69f092abec)

Change-Id: Ibafe136c2d0364741f0ea2e3d823e181d7983f20
Reviewed-on: https://gerrit.openafs.org/15518
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
2023-08-17 13:28:43 -04:00
2023-08-17 13:13:55 -04:00
2018-02-09 21:48:12 -05:00
2016-09-25 21:05:23 -04:00
2003-05-28 19:18:08 +00:00
2023-07-06 10:43:20 -04:00
2023-07-06 10:43:20 -04:00
2023-04-13 16:58:38 -04:00
2023-08-17 13:23:40 -04:00
2023-07-06 10:43:20 -04:00
2020-01-25 15:53:31 -05:00
2015-12-28 19:32:17 -05:00

AFS is a distributed file system that enables users to share and
access all of the files stored in a network of computers as easily as
they access the files stored on their local machines. The file system is
called distributed for this exact reason: files can reside on many
different machines, but are available to users on every machine.

OpenAFS 1.0 was originally released by IBM under the terms of the
IBM Public License 1.0 (IPL10).  For details on IPL10 see the LICENSE
file in this directory.  The current OpenAFS distribution is licensed
under a combination of the IPL10 and many other licenses as granted by
the relevant copyright holders.  The LICENSE file in this directory
contains more details, thought it is not a comprehensive statement.

See INSTALL for information about building and installing OpenAFS
on various platforms.

See CODING for developer information and guidelines.

See NEWS for recent changes to OpenAFS.

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