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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 /config.h.in
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 'config.h.in')
-rw-r--r--config.h.in4
1 files changed, 4 insertions, 0 deletions
diff --git a/config.h.in b/config.h.in
index d96ce0f..82f95a6 100644
--- a/config.h.in
+++ b/config.h.in
@@ -48,6 +48,10 @@
/* Define if compiler accepts -ftree-loop-distribute-patterns. */
#undef HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
+/* Define if compiler accepts -fno-stack-protector in an
+ __attribute__ ((__optimize__)). */
+#undef HAVE_CC_NO_STACK_PROTECTOR
+
/* The level of stack protection in use for glibc as a whole.
May be overridden on a file-by-file basis. */
#ifndef STACK_PROTECTOR_LEVEL