linux-kernel - [ 056/104] drm/i915: restrict kernel address leak in debugfs

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Date:	Mon, 25 Mar 2013 01:06:20 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Kees Cook <keescook@...omium.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [ 056/104] drm/i915: restrict kernel address leak in debugfs

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kees Cook <keescook@...omium.org>

commit 2563a4524febe8f4a98e717e02436d1aaf672aa2 upstream.

Masks kernel address info-leak in object dumps with the %pK suffix,
so they cannot be used to target kernel memory corruption attacks if
the kptr_restrict sysctl is set.

Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
[bwh: Backported to 3.2: the rest of the format string is different]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/i915/i915_debugfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -122,7 +122,7 @@ static const char *cache_level_str(int t
 static void
 describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
 {
-	seq_printf(m, "%p: %s%s %8zd %04x %04x %d %d%s%s%s",
+	seq_printf(m, "%pK: %s%s %8zd %04x %04x %d %d%s%s%s",
 		   &obj->base,
 		   get_pin_flag(obj),
 		   get_tiling_flag(obj),


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