linux-kernel - [ 11/12] regset: Return -EFAULT, not -EIO, on host-side memory fault

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Message-Id: <20120312002046.403300238@1wt.eu>
Date:	Mon, 12 Mar 2012 01:20:56 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Roland McGrath <roland@...k.frob.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 11/12] regset: Return -EFAULT, not -EIO, on host-side memory fault

2.6.32-longterm 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>
Cc: <stable@...r.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

diff --git a/include/linux/regset.h b/include/linux/regset.h
index 5150fd1..686f373 100644
--- a/include/linux/regset.h
+++ b/include/linux/regset.h
@@ -339,7 +339,7 @@ static inline int copy_regset_to_user(struct task_struct *target,
 		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(struct task_struct *target,
 		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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