linux-kernel - Re: [PATCH v3] microblaze: Fix clone syscall

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Date:	Thu, 01 Aug 2013 09:58:32 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>,
	dholsgrove@...inx.com, Rich Felker <dalias@...ifal.cx>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	James Hogan <james.hogan@...tec.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Kees Cook <keescook@...omium.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	microblaze-uclinux@...e.uq.edu.au
Subject: Re: [PATCH v3] microblaze: Fix clone syscall

On 07/31/2013 10:10 PM, Andrew Morton wrote:
> On Mon, 29 Jul 2013 09:01:48 +0200 Michal Simek <michal.simek@...inx.com> wrote:
> 
>> Fix inadvertent breakage in the clone syscall ABI for Microblaze
>> that was introduced in this patch:
>> "microblaze: switch to generic fork/vfork/clone"
>> (sha1: f3268edbe6fe0ce56e62c6d6b14640aeb04864b7)
>>
>> The Microblaze syscall ABI for clone takes the parent tid address in
>> the 4th argument; the third argument slot is used for the stack size.
>> The incorrectly-used CLONE_BACKWARDS type assigned parent tid to the
>> 3rd slot.
>>
>> This commit restores the original ABI so that existing userspace libc
>> code will work correctly.
>>
>> All kernel versions from v3.8-rc1 were affected.
> 
> x86_64 allnoconfig generates screenfuls of
> 
> In file included from fs/signalfd.c:31:
> include/linux/syscalls.h:805:5: warning: "CONFIG_CLONE_BACKWARDS3" is not defined
> 
>> --- a/include/linux/syscalls.h
>> +++ b/include/linux/syscalls.h
>> @@ -802,9 +802,14 @@ asmlinkage long sys_vfork(void);
>>  asmlinkage long sys_clone(unsigned long, unsigned long, int __user *, int,
>>  	       int __user *);
>>  #else
>> +#if CONFIG_CLONE_BACKWARDS3
> 
> Presumably ifdef here will fix that.  Please redo, retest and resend?

Yes,
I have got that email from Zero day testing system too.

Fixed in v4. I have also retest it for Microblaze.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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