On Sat, 7 May 2011, Christos Zoulas wrote:
Add a no_stack_protector function attribute to localize the effect
of disabling stack protection on a function-by-function level, as
opposed to per source file.
how should we enable use of this, is the patch below ok or should it have
additional restrictions? (kernel scope only? __SSP__/__SSP_ALL__?)
also, anybody with FSF privileges prepared to push the gcc addition
upstream?
iain
Index: cdefs.h
===
RCS file: /cvsroot/src/sys/sys/cdefs.h,v
retrieving revision 1.84
diff -u -p -r1.84 cdefs.h
--- cdefs.h 19 Feb 2011 02:21:21 - 1.84
+++ cdefs.h 13 May 2011 07:56:42 -
@@ -266,6 +266,12 @@
#define__BEGIN_DECLS __BEGIN_PUBLIC_DECLS
#define__END_DECLS __END_PUBLIC_DECLS
+#if __GNUC_PREREQ__(4, 1)
+#define__nossp __attribute__((__no_stack_protector__))
+#else
+#define__nossp /* nothing */
+#endif
+
/*
* Non-static C99 inline functions are optional bodies. They don't
* create global symbols if not used, but can be replaced if desirable.
