linux-kernel - [ 20/95] regset: Return -EFAULT, not -EIO, on host-side memory fault

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Message-Id: <20120309190203.938715861@linuxfoundation.org>
Date:	Fri, 09 Mar 2012 11:02:22 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, "H. Peter Anvin" <hpa@...or.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...k.frob.com>
Subject: [ 20/95] regset: Return -EFAULT, not -EIO, on host-side memory fault

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "H. Peter Anvin" <hpa@...or.com>

commit 5189fa19a4b2b4c3bec37c3a019d446148827717 upstream.

There is only one error code to return for a bad user-space buffer
pointer passed to a system call in the same address space as the
system call is executed, and that is EFAULT.  Furthermore, the
low-level access routines, which catch most of the faults, return
EFAULT already.

Signed-off-by: H. Peter Anvin <hpa@...or.com>
Reviewed-by: Oleg Nesterov <oleg@...hat.com>
Acked-by: Roland McGrath <roland@...k.frob.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/regset.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/regset.h
+++ b/include/linux/regset.h
@@ -339,7 +339,7 @@ static inline int copy_regset_to_user(st
 		return -EOPNOTSUPP;

 	if (!access_ok(VERIFY_WRITE, data, size))
-		return -EIO;
+		return -EFAULT;

 	return regset->get(target, regset, offset, size, NULL, data);
 }
@@ -365,7 +365,7 @@ static inline int copy_regset_from_user(
 		return -EOPNOTSUPP;

 	if (!access_ok(VERIFY_READ, data, size))
-		return -EIO;
+		return -EFAULT;

 	return regset->set(target, regset, offset, size, NULL, data);
 }

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