linux-kernel - [PATCH] drm: do not leak kernel addresses via /proc/dri/*/vma

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Message-ID: <20110212032944.GA24080@outflux.net>
Date:	Fri, 11 Feb 2011 19:29:44 -0800
From:	Kees Cook <kees.cook@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	Dan Rosenberg <drosenberg@...curity.com>,
	Eugene Teo <eugeneteo@...nel.org>
Subject: [PATCH] drm: do not leak kernel addresses via /proc/dri/*/vma

In the continuing effort to avoid kernel addresses leaking to unprivileged
users, this patch switches to %pK for /proc/dri/*/vma.

Signed-off-by: Kees Cook <kees.cook@...onical.com>
---
 drivers/gpu/drm/drm_info.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_info.c b/drivers/gpu/drm/drm_info.c
index 3cdbaf3..be9a9c0 100644
--- a/drivers/gpu/drm/drm_info.c
+++ b/drivers/gpu/drm/drm_info.c
@@ -283,17 +283,18 @@ int drm_vma_info(struct seq_file *m, void *data)
 #endif
 
 	mutex_lock(&dev->struct_mutex);
-	seq_printf(m, "vma use count: %d, high_memory = %p, 0x%08llx\n",
+	seq_printf(m, "vma use count: %d, high_memory = %pK, 0x%pK\n",
 		   atomic_read(&dev->vma_count),
-		   high_memory, (u64)virt_to_phys(high_memory));
+		   high_memory, (void *)virt_to_phys(high_memory));
 
 	list_for_each_entry(pt, &dev->vmalist, head) {
 		vma = pt->vma;
 		if (!vma)
 			continue;
 		seq_printf(m,
-			   "\n%5d 0x%08lx-0x%08lx %c%c%c%c%c%c 0x%08lx000",
-			   pt->pid, vma->vm_start, vma->vm_end,
+			   "\n%5d 0x%pK-0x%pK %c%c%c%c%c%c 0x%08lx000",
+			   pt->pid,
+			   (void *)vma->vm_start, (void *)vma->vm_end,
 			   vma->vm_flags & VM_READ ? 'r' : '-',
 			   vma->vm_flags & VM_WRITE ? 'w' : '-',
 			   vma->vm_flags & VM_EXEC ? 'x' : '-',
-- 
1.7.2.3

-- 
Kees Cook
Ubuntu Security Team
--
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