diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-03-19 11:10:17 -0700 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-23 14:55:27 -0700 |
commit | 92db6956ecd01ceb7934be0252b3b184a82ebb64 (patch) | |
tree | d8c355a1b37c649999339865335bc2e58de2aecd /security | |
parent | bd0f9040683db9a20376e6507e972aaac68f3429 (diff) |
Add '-fwrapv' to gcc CFLAGS
commit 68df3755e383e6fecf2354a67b08f92f18536594 upstream.
This makes sure that gcc doesn't try to optimize away wrapping
arithmetic, which the kernel occasionally uses for overflow testing, ie
things like
if (ptr + offset < ptr)
which technically is undefined for non-unsigned types. See
http://bugzilla.kernel.org/show_bug.cgi?id=12597
for details.
Not all versions of gcc support it, so we need to make it conditional
(it looks like it was introduced in gcc-3.4).
Reminded-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions