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authorNick Alcock <nick.alcock@oracle.com>2016-12-26 10:08:41 +0100
committerFlorian Weimer <fweimer@redhat.com>2016-12-26 10:08:41 +0100
commitde6591238b478bc86b8cf5af01a484114e399213 (patch)
tree2717c115fbc7518fcbe9348239ff536eb914d267 /configure.ac
parent003a27e8195470f470f4d9384ca70d4e9fc8bd1b (diff)
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Do not stack-protect ifunc resolvers [BZ #7065]
When dynamically linking, ifunc resolvers are called before TLS is initialized, so they cannot be safely stack-protected. We avoid disabling stack-protection on large numbers of files by using __attribute__ ((__optimize__ ("-fno-stack-protector"))) to turn it off just for the resolvers themselves. (We provide the attribute even when statically linking, because we will later use it elsewhere too.)
Diffstat (limited to 'configure.ac')
-rw-r--r--configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index c159768..f5fa1aa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -653,6 +653,7 @@ stack_protector=
no_stack_protector=
if test "$libc_cv_ssp" = yes; then
no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
+ AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
fi
if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then