linux-kernel - Re: [PATCH] x32: Mask away the x32 syscall bit in the ptrace codepath

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Message-ID: <538652EA.3040606@linux.intel.com>
Date:	Wed, 28 May 2014 14:19:38 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Philipp Kern <pkern@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. J. Lu" <hjl.tools@...il.com>, Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH] x32: Mask away the x32 syscall bit in the ptrace codepath

On 05/28/2014 02:15 PM, Andy Lutomirski wrote:
>>
>>> 3. The OOPS you're fixing doesn't seem like it's fixed.  What if some
>>> other random high bits are set?
>>
>> There is a range check in entry_*.S for the system call.
> 
> I can imagine that causing a certain amount of confusion to fancy
> seccomp users.  Oh, well.  No one that I know of has complained yet.
> 

I don't know how seccomp or audit deal with out-of-range syscall
numbers, so that might be worth taking a look at.

	-hpa


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