-fstack-protector-strong: Instrumentation for return slots
This patch fixes a loophole in the -fstack-protector-strong protection.
If a function call uses a return slot, the caller needs stack protector
instrumentation because the return slot is addressable.
gcc/
2014-05-09 Florian Weimer <fweimer@redhat.com>
* cfgexpand.c (stack_protect_decl_p): New function, extracted from
expand_used_vars.
(stack_protect_return_slot_p): New function.
(expand_used_vars): Call stack_protect_decl_p and
stack_protect_return_slot_p for -fstack-protector-strong.
gcc/testsuite/
2014-05-09 Florian Weimer <fweimer@redhat.com>
* gcc.dg/fstack-protector-strong.c: Add coverage for return slots.
* g++.dg/fstack-protector-strong.C: Likewise.
* gcc.target/i386/ssp-strong-reg.c: New file.
From-SVN: r210275