[PATCH 08/12] De-PLTize __stack_chk_fail internal calls within libc.so.

[Nix <nix@esperi.org.uk>]

From: Adhemerval Zanella <adhemerval.zanella@linaro.org>

We use the same assembler-macro trick we use to de-PLTize
compiler-generated libcalls to memcpy and memset to redirect
__stack_chk_fail to __stack_chk_fail_local.

v5: New.
v6: Only do it within the shared library: with __stack_chk_fail_local
    in libc_pic.a now we don't need to worry about calls from inside
    other routines in libc_nonshared.a any more.
v8: Merge #ifdef blocks.

	* sysdeps/generic/symbol-hacks.h (__stack_chk_fail): Add internal
	alias.
---
 sysdeps/generic/symbol-hacks.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sysdeps/generic/symbol-hacks.h b/sysdeps/generic/symbol-hacks.h
index ce576c9..36908b5 100644
--- a/sysdeps/generic/symbol-hacks.h
+++ b/sysdeps/generic/symbol-hacks.h
@@ -4,4 +4,8 @@
 asm ("memmove = __GI_memmove");
 asm ("memset = __GI_memset");
 asm ("memcpy = __GI_memcpy");
+
+/* -fstack-protector generates calls to __stack_chk_fail, which need
+   similar adjustments to avoid going through the PLT.  */
+asm ("__stack_chk_fail = __stack_chk_fail_local");
 #endif
-- 
2.10.1.208.gbec66bc