linux-kernel - Re: [PATCH 2/3 v3] x86: entry_64.S: always allocate complete "struct pt

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Date:	Wed, 25 Feb 2015 14:55:34 +0100
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Andrey Wagin <avagin@...il.com>
CC:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3 v3] x86: entry_64.S: always allocate complete "struct
 pt_regs"

On 02/25/2015 01:37 PM, Andrey Wagin wrote:
> 2015-02-13 0:54 GMT+03:00 Denys Vlasenko <dvlasenk@...hat.com>:
> My test vm doesn't boot with this patch. Could you help to investigate
> this issue?

Hi Andrey, thanks for testing!

> I have attached a kernel config and console log.

Looking at the logs, it seems that regular syscalls do work:
systemd managed to function for some time, even spawned
a few children.

It might be that the bug is somewhere in signal delivery code.
This would explain why oops got delayed.

I am trying to reproduce it. My gcc seems to be a bit old -
it can't digest CONFIG_CC_STACKPROTECTOR_STRONG=y in your .config.

I switched to using "only" CONFIG_CC_STACKPROTECTOR_REGULAR=y:

CONFIG_CC_STACKPROTECTOR=y
# CONFIG_CC_STACKPROTECTOR_NONE is not set
CONFIG_CC_STACKPROTECTOR_REGULAR=y
# CONFIG_CC_STACKPROTECTOR_STRONG is not set

and resulting kernel works for me.

Can you send me your bzImage (off-list, of course)?

I'll send you my qemu test setup, can you check whether crash
is happening for you when you run your kernel in it?

-- 
vda

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