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From: Nick Piggin <npiggin@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
	Nick Piggin <npiggin@suse.de>,
	Linux Memory Management <linux-mm@kvack.org>,
	Hugh Dickins <hugh@veritas.com>
Subject: [patch 4/5] mm: extra remap_vmalloc_range check
Date: Thu, 20 Apr 2006 19:06:52 +0200 (CEST)	[thread overview]
Message-ID: <20060228202246.14172.12624.sendpatchset@linux.site> (raw)
In-Reply-To: <20060228202202.14172.60409.sendpatchset@linux.site>

Add a flag to ensure all remap_vmalloc_range memory has been allocated
with the vmalloc _user variants, so data does not get leaked.

Signed-off-by: Nick Piggin <npiggin@suse.de>

Index: linux-2.6/include/linux/vmalloc.h
===================================================================
--- linux-2.6.orig/include/linux/vmalloc.h
+++ linux-2.6/include/linux/vmalloc.h
@@ -8,6 +8,7 @@
 #define VM_IOREMAP	0x00000001	/* ioremap() and friends */
 #define VM_ALLOC	0x00000002	/* vmalloc() */
 #define VM_MAP		0x00000004	/* vmap()ed pages */
+#define VM_USERMAP	0x00000008	/* suitable for remap_vmalloc_range */
 /* bits [20..32] reserved for arch specific ioremap internals */
 
 /*
Index: linux-2.6/drivers/media/video/et61x251/et61x251_core.c
===================================================================
--- linux-2.6.orig/drivers/media/video/et61x251/et61x251_core.c
+++ linux-2.6/drivers/media/video/et61x251/et61x251_core.c
@@ -133,7 +133,8 @@ et61x251_request_buffers(struct et61x251
 
 	cam->nbuffers = count;
 	while (cam->nbuffers > 0) {
-		if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
+		if ((buff = vmalloc_32_user(cam->nbuffers *
+						PAGE_ALIGN(imagesize))))
 			break;
 		cam->nbuffers--;
 	}
Index: linux-2.6/drivers/media/video/sn9c102/sn9c102_core.c
===================================================================
--- linux-2.6.orig/drivers/media/video/sn9c102/sn9c102_core.c
+++ linux-2.6/drivers/media/video/sn9c102/sn9c102_core.c
@@ -149,7 +149,7 @@ sn9c102_request_buffers(struct sn9c102_d
 
 	cam->nbuffers = count;
 	while (cam->nbuffers > 0) {
-		if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
+		if ((buff = vmalloc_32_user(cam->nbuffers * PAGE_ALIGN(imagesize))))
 			break;
 		cam->nbuffers--;
 	}
Index: linux-2.6/drivers/media/video/zc0301/zc0301_core.c
===================================================================
--- linux-2.6.orig/drivers/media/video/zc0301/zc0301_core.c
+++ linux-2.6/drivers/media/video/zc0301/zc0301_core.c
@@ -136,7 +136,7 @@ zc0301_request_buffers(struct zc0301_dev
 
 	cam->nbuffers = count;
 	while (cam->nbuffers > 0) {
-		if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
+		if ((buff = vmalloc_32_user(cam->nbuffers * PAGE_ALIGN(imagesize))))
 			break;
 		cam->nbuffers--;
 	}
Index: linux-2.6/mm/vmalloc.c
===================================================================
--- linux-2.6.orig/mm/vmalloc.c
+++ linux-2.6/mm/vmalloc.c
@@ -525,7 +525,15 @@ EXPORT_SYMBOL(vmalloc);
  */
 void *vmalloc_user(unsigned long size)
 {
-	return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
+	struct vm_struct *area;
+	void *ret;
+
+	ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
+	area = find_vm_area(ret);
+	BUG_ON(!area);
+	area->flags |= VM_USERMAP;
+
+	return ret;
 }
 EXPORT_SYMBOL(vmalloc_user);
 
@@ -592,7 +600,15 @@ EXPORT_SYMBOL(vmalloc_32);
  */
 void *vmalloc_32_user(unsigned long size)
 {
-	return __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
+	struct vm_struct *area;
+	void *ret;
+
+	ret = __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
+	area = find_vm_area(ret);
+	BUG_ON(!area);
+	area->flags |= VM_USERMAP;
+
+	return ret;
 }
 EXPORT_SYMBOL(vmalloc_32_user);
 
@@ -700,6 +716,9 @@ int remap_vmalloc_range(struct vm_area_s
 	if (!area)
 		return -EINVAL;
 
+	if (!(area->flags & VM_USERMAP))
+		return -EINVAL;
+
 	if (usize + (pgoff << PAGE_SHIFT) > area->size - PAGE_SIZE)
 		return -EINVAL;
 
Index: linux-2.6/drivers/media/video/em28xx/em28xx-core.c
===================================================================
--- linux-2.6.orig/drivers/media/video/em28xx/em28xx-core.c
+++ linux-2.6/drivers/media/video/em28xx/em28xx-core.c
@@ -79,10 +79,8 @@ u32 em28xx_request_buffers(struct em28xx
 
 	dev->num_frames = count;
 	while (dev->num_frames > 0) {
-		if ((buff = vmalloc_32(dev->num_frames * imagesize))) {
-			memset(buff, 0, dev->num_frames * imagesize);
+		if ((buff = vmalloc_32_user(dev->num_frames * imagesize)))
 			break;
-		}
 		dev->num_frames--;
 	}
 

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  parent reply	other threads:[~2006-04-20 17:06 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-20 17:06 [patch 0/5] mm: improve remapping of vmalloc regions Nick Piggin
2006-04-20 17:06 ` [patch 1/5] mm: remap_vmalloc_range Nick Piggin
2006-04-20 17:22   ` Christoph Hellwig
2006-04-20 17:33     ` Nick Piggin
2006-04-20 18:09   ` Nick Piggin
2006-04-20 17:06 ` [patch 2/5] mm: deprecate vmalloc_to_pfn Nick Piggin
2006-04-20 17:22   ` Christoph Hellwig
2006-04-20 17:36     ` Nick Piggin
2006-04-20 20:03       ` Andrew Morton
2006-04-20 17:06 ` [patch 3/5] mm: remove rvmalloc Nick Piggin
2006-04-20 17:06 ` Nick Piggin [this message]
2006-04-20 17:07 ` [patch 5/5] drivers: leave vm_flags alone Nick Piggin
2006-04-20 17:27 ` [patch 6/5] mm: find_vm_area locking fixes Nick Piggin
2006-04-20 18:14 ` [patch][rfc] improve remap_vmalloc_range callers' return values Nick Piggin
  -- strict thread matches above, loose matches on Subject: below --
2006-04-21  6:43 [patch 0/5] mm: improve remapping of vmalloc regions Nick Piggin
2006-04-21  6:43 ` [patch 4/5] mm: extra remap_vmalloc_range check Nick Piggin

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