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.)

1 files changed, 1 insertions, 0 deletions

diff --git a/elf/ifuncmain7.c b/elf/ifuncmain7.c
index 617a596d5e..1e8f7ea38e 100644
--- a/elf/ifuncmain7.c
+++ b/elf/ifuncmain7.c
@@ -20,6 +20,7 @@ __asm__(".type foo, %gnu_indirect_function");
 
 static void *
 __attribute__ ((used))
+inhibit_stack_protector
 foo_ifunc (void)
 {
   return ifunc_one (one);