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Commit 0494e082 authored by Sergey Senozhatsky's avatar Sergey Senozhatsky Committed by Catalin Marinas
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kmemleak: Printing of the objects hex dump 



Introducing printing of the objects hex dump to the seq file.
The number of lines to be printed is limited to HEX_MAX_LINES
to prevent seq file spamming. The actual number of printed
bytes is less than or equal to (HEX_MAX_LINES * HEX_ROW_SIZE).

(slight adjustments by Catalin Marinas)

Signed-off-by: default avatarSergey Senozhatsky <sergey.senozhatsky@mail.by>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 008139d9

mm/kmemleak.c

+39 −0
Original line number Original line Diff line number Diff line
@@ -162,6 +162,15 @@ struct kmemleak_object { 
/* flag set on newly allocated objects */

/* flag set on newly allocated objects */

#define OBJECT_NEW		(1 << 3)

#define OBJECT_NEW		(1 << 3)





/* number of bytes to print per line; must be 16 or 32 */

#define HEX_ROW_SIZE		16

/* number of bytes to print at a time (1, 2, 4, 8) */

#define HEX_GROUP_SIZE		1

/* include ASCII after the hex output */

#define HEX_ASCII		1

/* max number of lines to be printed */

#define HEX_MAX_LINES		2



/* the list of all allocated objects */

/* the list of all allocated objects */

static LIST_HEAD(object_list);

static LIST_HEAD(object_list);

/* the list of gray-colored objects (see color_gray comment below) */

/* the list of gray-colored objects (see color_gray comment below) */
@@ -258,6 +267,35 @@ static void kmemleak_disable(void); 
	kmemleak_disable();		\

	kmemleak_disable();		\

} while (0)

} while (0)





/*

 * Printing of the objects hex dump to the seq file. The number of lines to be

 * printed is limited to HEX_MAX_LINES to prevent seq file spamming. The

 * actual number of printed bytes depends on HEX_ROW_SIZE. It must be called

 * with the object->lock held.

 */

static void hex_dump_object(struct seq_file *seq,

			    struct kmemleak_object *object)

{

	const u8 *ptr = (const u8 *)object->pointer;

	int i, len, remaining;

	unsigned char linebuf[HEX_ROW_SIZE * 5];



	/* limit the number of lines to HEX_MAX_LINES */

	remaining = len =

		min(object->size, (size_t)(HEX_MAX_LINES * HEX_ROW_SIZE));



	seq_printf(seq, "  hex dump (first %d bytes):\n", len);

	for (i = 0; i < len; i += HEX_ROW_SIZE) {

		int linelen = min(remaining, HEX_ROW_SIZE);



		remaining -= HEX_ROW_SIZE;

		hex_dump_to_buffer(ptr + i, linelen, HEX_ROW_SIZE,

				   HEX_GROUP_SIZE, linebuf, sizeof(linebuf),

				   HEX_ASCII);

		seq_printf(seq, "    %s\n", linebuf);

	}

}



/*

/*

 * Object colors, encoded with count and min_count:

 * Object colors, encoded with count and min_count:

 * - white - orphan object, not enough references to it (count < min_count)

 * - white - orphan object, not enough references to it (count < min_count)
@@ -308,6 +346,7 @@ static void print_unreferenced(struct seq_file *seq, 
		   object->pointer, object->size);

		   object->pointer, object->size);

	seq_printf(seq, "  comm \"%s\", pid %d, jiffies %lu\n",

	seq_printf(seq, "  comm \"%s\", pid %d, jiffies %lu\n",

		   object->comm, object->pid, object->jiffies);

		   object->comm, object->pid, object->jiffies);

	hex_dump_object(seq, object);

	seq_printf(seq, "  backtrace:\n");

	seq_printf(seq, "  backtrace:\n");





	for (i = 0; i < object->trace_len; i++) {

	for (i = 0; i < object->trace_len; i++) {