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Old 03-08-2012, 03:08 PM
Andy Whitcroft
 
Default regset: Return -EFAULT, not -EIO, on host-side memory fault

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

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@zytor.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@hack.frob.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

(cherry picked from commit 5189fa19a4b2b4c3bec37c3a019d446148827717)
CVE-2012-1097
BugLink: http://bugs.launchpad.net/bugs/949905
Signed-off-by: Andy Whitcroft <apw@canonical.com>
---
include/linux/regset.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

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);
}
--
1.7.9


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