about summary refs log tree commit diff
path: root/elf/ifuncmain6pie.c
diff options
context:
space:
mode:
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 /elf/ifuncmain6pie.c
parent003a27e8195470f470f4d9384ca70d4e9fc8bd1b (diff)
downloadglibc-de6591238b478bc86b8cf5af01a484114e399213.tar.gz
glibc-de6591238b478bc86b8cf5af01a484114e399213.tar.xz
glibc-de6591238b478bc86b8cf5af01a484114e399213.zip
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 'elf/ifuncmain6pie.c')
-rw-r--r--elf/ifuncmain6pie.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/elf/ifuncmain6pie.c b/elf/ifuncmain6pie.c
index 8478d4c408..04faeb86ef 100644
--- a/elf/ifuncmain6pie.c
+++ b/elf/ifuncmain6pie.c
@@ -21,6 +21,7 @@ void * foo_ifunc (void) __asm__ ("foo");
 __asm__(".type foo, %gnu_indirect_function");
 
 void *
+inhibit_stack_protector
 foo_ifunc (void)
 {
   return ifunc_one (one);