linux-kernel - Re: [PATCH] mm/mincore: Return EFAULT when passed an invalid address.

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Message-ID: <Pine.LNX.4.64.0702240052360.9507@blonde.wat.veritas.com>
Date:	Sat, 24 Feb 2007 01:05:27 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Joel Becker <Joel.Becker@...cle.com>
cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] mm/mincore: Return EFAULT when passed an invalid address.

On Fri, 23 Feb 2007, Joel Becker wrote:

>  	The locking fix to sys_mincore in commit
> 2f77d107050abc14bc393b34bdb7b91cf670c250 returns -ENOMEM when given a
> bad userspace address.  It should return -EFAULT.

No, I think you're getting confused by the way Linus uses access_ok
on the address range given with the access_ok on the vector address.

Before and after, an access_ok failure on the output vector address
gives -EFAULT.  Before and after, an invalid address in the range
to be inspected gives -ENOMEM.

Which is consistent with the other m* system calls: -EFAULT if
arguments are inaccessible, -ENOMEM if address range is invalid.

Hugh
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