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Add missing store in emission of asan_stack_free. 

gcc/ChangeLog:

2020-05-19  Martin Liska  <mliska@suse.cz>

	PR sanitizer/94910
	* asan.c (asan_emit_stack_protection): Emit
	also **SavedFlagPtr(FakeStack, class_id) = 0 in order to release
	a stack frame.
This commit is contained in:
Martin Liska 2020-05-19 16:57:56 +02:00
parent df81764ba1
commit 8b6731e674
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1 changed files with 18 additions and 2 deletions
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20
gcc/asan.c
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@ -1598,8 +1598,24 @@ asan_emit_stack_protection (rtx base, rtx pbase, unsigned int alignb,
if (use_after_return_class < 5
&& can_store_by_pieces (sz, builtin_memset_read_str, &c,
BITS_PER_UNIT, true))
store_by_pieces (shadow_mem, sz, builtin_memset_read_str, &c,
BITS_PER_UNIT, true, RETURN_BEGIN);
{
/* Emit:
memset(ShadowBase, kAsanStackAfterReturnMagic, ShadowSize);
**SavedFlagPtr(FakeStack, class_id) = 0
*/
store_by_pieces (shadow_mem, sz, builtin_memset_read_str, &c,
BITS_PER_UNIT, true, RETURN_BEGIN);
unsigned HOST_WIDE_INT offset
= (1 << (use_after_return_class + 6));
offset -= GET_MODE_SIZE (ptr_mode);
mem = gen_rtx_MEM (ptr_mode, base);
mem = adjust_address (mem, ptr_mode, offset);
rtx addr = gen_reg_rtx (ptr_mode);
emit_move_insn (addr, mem);
mem = gen_rtx_MEM (QImode, addr);
emit_move_insn (mem, const0_rtx);
}
else if (use_after_return_class >= 5
|| !set_storage_via_setmem (shadow_mem,
GEN_INT (sz),