linux-kernel - [PATCHv3 01/10] fbdev: ssd1307fb: fix memory address smem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon,  9 Mar 2015 23:22:03 +0100
From:	Thomas Niederprüm <niederp@...sik.uni-kl.de>
To:	plagnioj@...osoft.com, tomi.valkeinen@...com,
	maxime.ripard@...e-electrons.com, kernel@...gutronix.de,
	shawn.guo@...aro.org, robh+dt@...nel.org
Cc:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Niederprüm <niederp@...sik.uni-kl.de>
Subject: [PATCHv3 01/10] fbdev: ssd1307fb: fix memory address smem_start.

the smem_start pointer of the framebuffer info struct needs to hold the
physical address rather than the virtual address. This patch fixes a
driver crash on mmaping the framebuffer memory due to an access to the
memory address.

Note however that the memory allocated by kzalloc is not page aligned,
while the address presented on a mmap call is aligned to the next page
boudary.

Signed-off-by: Thomas Niederprüm <niederp@...sik.uni-kl.de>
Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
---
 drivers/video/fbdev/ssd1307fb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index f7ed6d9..61e0ce8 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -515,7 +515,7 @@ static int ssd1307fb_probe(struct i2c_client *client,
 	info->var.blue.offset = 0;
 
 	info->screen_base = (u8 __force __iomem *)vmem;
-	info->fix.smem_start = (unsigned long)vmem;
+	info->fix.smem_start = __pa(vmem);
 	info->fix.smem_len = vmem_size;
 
 	fb_deferred_io_init(info);
-- 
2.3.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/