linux-kernel - [PATCH 10/10] Allow reading/writing all memory through /dev/mem

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Date:	Fri, 17 Jun 2011 10:48:27 +0200
From:	Petr Tesarik <ptesarik@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 10/10] Allow reading/writing all memory through /dev/mem

With all pieces in place, I can now change the type of the physical
address pointer and get access to all memory.

Signed-off-by: Petr Tesarik <ptesarik@...e.cz>
---
 drivers/char/mem.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index cbbaf36..bc16ab7 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -93,7 +93,7 @@ void __weak unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
 static ssize_t read_mem(struct file *file, char __user *buf,
 			size_t count, loff_t *ppos)
 {
-	unsigned long p = *ppos;
+	phys_addr_t p = *ppos;
 	ssize_t read, sz;
 	char *ptr;
 
@@ -153,7 +153,7 @@ static ssize_t read_mem(struct file *file, char __user *buf,
 static ssize_t write_mem(struct file *file, const char __user *buf,
 			 size_t count, loff_t *ppos)
 {
-	unsigned long p = *ppos;
+	phys_addr_t p = *ppos;
 	ssize_t written, sz;
 	unsigned long copied;
 	void *ptr;
-- 
1.7.3.4
--
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