diff options
| -rw-r--r-- | mm/kmemleak.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c index 8172154502a6..1d7645b0a97c 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -162,6 +162,15 @@ struct kmemleak_object { /* flag set on newly allocated objects */ #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 */ static LIST_HEAD(object_list); /* the list of gray-colored objects (see color_gray comment below) */ @@ -259,6 +268,35 @@ static void kmemleak_disable(void); } 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: * - white - orphan object, not enough references to it (count < min_count) * - gray - not orphan, not marked as false positive (min_count == 0) or @@ -308,6 +346,7 @@ static void print_unreferenced(struct seq_file *seq, object->pointer, object->size); seq_printf(seq, " comm \"%s\", pid %d, jiffies %lu\n", object->comm, object->pid, object->jiffies); + hex_dump_object(seq, object); seq_printf(seq, " backtrace:\n"); for (i = 0; i < object->trace_len; i++) { |