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

From: Hugh Dickins
Date: Fri Feb 23 2007 - 20:05:50 EST

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.

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