Status: Accepted
Owner: [email protected]
CC: [email protected]
Labels: Type-Defect Priority-Medium
New issue 307 by [email protected]: Asm instrumentation does not preserve
flags
http://code.google.com/p/address-sanitizer/issues/detail?id=307
0x00007fbddec82e6c <+44>: sub $0x80,%rsp
0x00007fbddec82e73 <+51>: push %rdi
0x00007fbddec82e74 <+52>: lea (%rsi),%rdi
0x00007fbddec82e77 <+55>: callq 0x7fbddec66380
<__sanitizer_sanitize_store4@plt>
0x00007fbddec82e7c <+60>: pop %rdi
=> 0x00007fbddec82e7d <+61>: add $0x80,%rsp
^^^ This instruction clobbers flags.
(gdb) disassemble __sanitizer_sanitize_store4
Dump of assembler code for function __sanitizer_sanitize_store4:
0x00000000004a9a48 <+0>: sub $0x80,%rsp
^^^ This instruction clobbers flags, too.
0x00000000004a9a4f <+7>: push %rax
0x00000000004a9a50 <+8>: push %rcx
0x00000000004a9a51 <+9>: pushfq
^^^ This pushfq is too late (and corresponding popfq is too early).
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