linux-kernel - [PATCH RFC 5/7] fs: Silence bogus copy_to

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Date:	Sat, 14 Apr 2012 09:20:35 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org,
	torvalds@...ux-foundation.org,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH RFC 5/7] fs: Silence bogus copy_to_user() build errors

From: "Paul E. McKenney" <paul.mckenney@...aro.org>

The copy_to_user() function now does some compile-time buffer-size
checks, but these checks can be fooled by pointers, which always
appear to be 4 or 8 bytes long for 32-bit and 64-bit builds, respectively.
Take care of the warnings in fs/binfmt_misc.c by invoking the underlying
_copy_to_user() function.

Signed-off-by: Paul E. McKenney <paul.mckenney@...aro.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 fs/binfmt_misc.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index a9198df..e5ea8c3 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -310,7 +310,7 @@ static Node *create_entry(const char __user *buffer, size_t count)
 	p = buf = (char *)e + sizeof(Node);
 
 	memset(e, 0, sizeof(Node));
-	if (copy_from_user(buf, buffer, count))
+	if (_copy_from_user(buf, buffer, count))
 		goto Efault;
 
 	del = *p++;	/* delimeter */
@@ -418,7 +418,7 @@ static int parse_command(const char __user *buffer, size_t count)
 		return 0;
 	if (count > 3)
 		return -EINVAL;
-	if (copy_from_user(s, buffer, count))
+	if (_copy_from_user(s, buffer, count))
 		return -EFAULT;
 	if (s[count-1] == '\n')
 		count--;
-- 
1.7.8

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