tunables: Use direct syscall for access (BZ#21744)

The function maybe_enable_malloc_check, which is called by
__tunables_init, calls __access_noerrno.  It isn't problem when
symbol is is in ld.so, which has a special version of __access_noerrno
without stack protector.  But when glibc is built with stack protector,
maybe_enable_malloc_check in libc.a can't call the regular version of
__access_noerrno with stack protector.

This patch changes how Linux defines the __access_noerrno to be an
inline call instead and thus preventing defining different build
rules for ld/static and shared.

	H.J. Lu  <hongjiu.lu@intel.com>
	Adhemerval Zanella  <adhemerval.zanella@linaro.org>

	[BZ #21744]
	* elf/dl-tunables.c: Include not-errno.h header.
	* include/unistd.h (__access_noerrno): Remove definition.
	* sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise.
	* sysdeps/generic/not-errno.h: New file.
	* sysdeps/unix/sysv/linux/not-errno.h: Likewise.

1 files changed, 10 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 7da4510..554fdac 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2017-07-24  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
+	    H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #21744]
+	* elf/dl-tunables.c: Include not-errno.h header.
+	* include/unistd.h (__access_noerrno): Remove definition.
+	* sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise.
+	* sysdeps/generic/not-errno.h: New file.
+	* sysdeps/unix/sysv/linux/not-errno.h: Likewise.
+
 2017-07-24  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #21752]