linux-kernel - [PATCH 06/15] kmemleak: Add the vmalloc memory allocation/freeing hooks

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Date:	Sat, 29 Nov 2008 10:43:40 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH 06/15] kmemleak: Add the vmalloc memory allocation/freeing
	hooks

This patch adds the callbacks to memleak_(alloc|free) functions from
vmalloc/vfree.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Cc: Ingo Molnar <mingo@...e.hu>
---
 mm/vmalloc.c |   29 ++++++++++++++++++++++++++---
 1 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ba6b0f5..c0340ac 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -23,6 +23,7 @@
 #include <linux/rbtree.h>
 #include <linux/radix-tree.h>
 #include <linux/rcupdate.h>
+#include <linux/memleak.h>
 
 #include <asm/atomic.h>
 #include <asm/uaccess.h>
@@ -1173,6 +1174,9 @@ static void __vunmap(const void *addr, int deallocate_pages)
 void vfree(const void *addr)
 {
 	BUG_ON(in_interrupt());
+
+	memleak_free(addr);
+
 	__vunmap(addr, 1);
 }
 EXPORT_SYMBOL(vfree);
@@ -1282,8 +1286,17 @@ fail:
 
 void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot)
 {
-	return __vmalloc_area_node(area, gfp_mask, prot, -1,
-					__builtin_return_address(0));
+	void *addr = __vmalloc_area_node(area, gfp_mask, prot, -1,
+					 __builtin_return_address(0));
+
+	/*
+	 * This needs ref_count = 2 since vm_struct also contains a
+	 * pointer to this address. The guard page is also subtracted
+	 * from the size.
+	 */
+	memleak_alloc(addr, area->size - PAGE_SIZE, 2);
+
+	return addr;
 }
 
 /**
@@ -1302,6 +1315,8 @@ static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot,
 						int node, void *caller)
 {
 	struct vm_struct *area;
+	void *addr;
+	unsigned long real_size = size;
 
 	size = PAGE_ALIGN(size);
 	if (!size || (size >> PAGE_SHIFT) > num_physpages)
@@ -1313,7 +1328,15 @@ static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot,
 	if (!area)
 		return NULL;
 
-	return __vmalloc_area_node(area, gfp_mask, prot, node, caller);
+	addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller);
+
+	/*
+	 * This needs ref_count = 2 since the vm_struct also contains
+	 * a pointer to this address.
+	 */
+	memleak_alloc(addr, real_size, 2);
+
+	return addr;
 }
 
 void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)

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