linux-kernel - mincore returning -ENOMEM instead of -EFAULT

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Message-ID: <20070223225847.GL7920@ca-server1.us.oracle.com>
Date:	Fri, 23 Feb 2007 14:58:47 -0800
From:	Joel Becker <Joel.Becker@...cle.com>
To:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: mincore returning -ENOMEM instead of -EFAULT

Linus,
	Your fix in commit 2f77d107050abc14bc393b34bdb7b91cf670c250
modifies sys_mincore() to return -ENOMEM instead of -EFAULT on a totally
bogus address.  Was this intentional, or is it something that should be
fixed up?

-       /* check the output buffer whilst holding the lock */
-       error = -EFAULT;
-       down_read(&current->mm->mmap_sem);
+       /* ..and we need to be passed a valid user-space range */
+       if (!access_ok(VERIFY_READ, (void __user *) start, len))
+               return -ENOMEM;

Joel

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Joel Becker
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Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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