linux-kernel - [kernel-hardening] [RFC V2 6/6] drivers: uio: un-restrict sysfs pointers for UIO

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Date:   Sun,  1 Oct 2017 11:06:50 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
        Ian Campbell <ijc@...lion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     "Tobin C. Harding" <me@...in.cc>,
        kernel-hardening@...ts.openwall.com, 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: [kernel-hardening] [RFC V2 6/6] drivers: uio: un-restrict sysfs pointers for UIO

The address and size on the UIO devices are required by userspace to
function properly.  Let's un-restrict these by adding the 'P' modifier
to %pa.

Signed-off-by: Tobin C. Harding <me@...in.cc>
---
 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 ff04b7f..728ec8f 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)
-- 
2.7.4