linux-kernel - [RFC 6/6] drivers: uio: Un-restrict sysfs pointers for UIO

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Message-ID: <20170506040759.GG32707@kroah.com>
Date:   Fri, 5 May 2017 21:07:59 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     kernel-hardening@...ts.openwall.com,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        William Roberts <william.c.roberts@...el.com>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>
Subject: [RFC 6/6] drivers: uio: Un-restrict sysfs pointers for UIO

From: Chris Fries <cfries@...gle.com>

The addr and size on the UIO devices are required by userspace to function
properly.  Let's unrestrict these by adding the 'P' modifier to %p and %pa.

Cc: William Roberts <william.c.roberts@...el.com>
Cc: Dave Weinstein <olorin@...gle.com>
Signed-off-by: Chris Fries <cfries@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/uio/uio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 60ce7fd54e89..d9eae52519f4 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -56,12 +56,12 @@ static ssize_t map_name_show(struct uio_mem *mem, char *buf)
 
 static ssize_t map_addr_show(struct uio_mem *mem, char *buf)
 {
-	return sprintf(buf, "%pa\n", &mem->addr);
+	return sprintf(buf, "%paP\n", &mem->addr);
 }
 
 static ssize_t map_size_show(struct uio_mem *mem, char *buf)
 {
-	return sprintf(buf, "%pa\n", &mem->size);
+	return sprintf(buf, "%paP\n", &mem->size);
 }
 
 static ssize_t map_offset_show(struct uio_mem *mem, char *buf)
-- 
2.12.2