linux-kernel - Re: [PATCH 1/2] x86: entry_64.S: always allocate complete "struct pt

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Message-ID: <CAK1hOcObC8JtmRmv+ucjug2=fhB6S4W3qdT=DXatb7mCT07AUg@mail.gmail.com>
Date:	Thu, 12 Feb 2015 22:53:29 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"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>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] x86: entry_64.S: always allocate complete "struct pt_regs"

On Thu, Feb 12, 2015 at 6:17 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Wed, Feb 11, 2015 at 10:55:52PM +0100, Denys Vlasenko wrote:
>> Macros which manipulate "struct pt_regs" on stack are reworked:
>> ALLOC_PT_GPREGS_ON_STACK allocates the structure.
>> SAVE_C_REGS saves to it those registers which are clobbered by C code.
>> SAVE_EXTRA_REGS saves to it all other registers.
>> Corresponding RESTORE_* and REMOVE_PT_GPREGS_FROM_STACK macros reverse it.
>>
>
> You'd need to redo that patch against latest upstream because of changes
> it is missing:
>
> Andy's branch x86/entry should have them too:
> http://git.kernel.org/cgit/linux/kernel/git/luto/linux.git
>
> arch/x86/kernel/entry_64.S: Assembler messages:
> arch/x86/kernel/entry_64.S:760: Error: no such instruction: `restore_args 1,8,1'
> make[2]: *** [arch/x86/kernel/entry_64.o] Error 1
> make[1]: *** [arch/x86/kernel] Error 2
> make[1]: *** Waiting for unfinished jobs....
> make: *** [arch/x86] Error 2
> make: *** Waiting for unfinished jobs....

Thanks!
The renaming of macros caught the bug at compile time, as intended.

I'll send an updated patch set v3 in a minute. It will have
additional patch in front, since that location in code
also wrongly uses R11 instead of ARGOFFSET.
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