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Message-ID: <47B4D233.23110.5E1523@pageexec.freemail.hu>
Date: Thu, 14 Feb 2008 23:43:47 +0200
From: pageexec@...email.hu
To: Ingo Molnar <mingo@...e.hu>, Jakub Jelinek <jakub@...hat.com>
CC: Sam Ravnborg <sam@...nborg.org>,
Arjan van de Ven <arjan@...radead.org>,
linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [x86.git#mm] stack protector fixes, vmsplice exploit
On 14 Feb 2008 at 17:35, Jakub Jelinek wrote:
> Where do you see a mispredicted branch?
try it with -Os (gentoo gcc 4.2.2):
0000000000000000 <foo>:
0: 48 83 ec 58 sub $0x58,%rsp
4: 65 48 8b 04 25 28 00 00 00 mov %gs:0x28,%rax
d: 48 89 44 24 48 mov %rax,0x48(%rsp)
12: 31 c0 xor %eax,%eax
14: 48 89 e7 mov %rsp,%rdi
17: e8 00 00 00 00 callq 1c <foo+0x1c> 18: R_X86_64_PC32
bar+0xfffffffffffffffc
1c: 48 8b 54 24 48 mov 0x48(%rsp),%rdx
21: 65 48 33 14 25 28 00 00 00 xor %gs:0x28,%rdx
2a: b8 06 00 00 00 mov $0x6,%eax
2f: 74 05 je 36 <foo+0x36>
31: e8 00 00 00 00 callq 36 <foo+0x36> 32: R_X86_64_PC32
__stack_chk_fail+0xfffffffffffffffc
36: 48 83 c4 58 add $0x58,%rsp
3a: c3 retq
--
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