mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-25 23:49:32 -05:00
130 lines
4.4 KiB
Diff
130 lines
4.4 KiB
Diff
From 83366dd9ddb9337450f704ceef750a06c69df9ff Mon Sep 17 00:00:00 2001
|
|
From: Franky Lin <franky.lin@broadcom.com>
|
|
Date: Wed, 5 Jul 2017 18:04:55 -0700
|
|
Subject: [PATCH] net: wireless: bcmdhd: add log trace event length check
|
|
|
|
In log trace event parsing routine, add appropriate length check before
|
|
accessing event data to prevent out of boundary memory access
|
|
|
|
Bug: 37305633
|
|
Signed-off-by: Franky Lin <franky.lin@broadcom.com>
|
|
Change-Id: I267369957f9b8788f254d9433eb7787b75fb04bc
|
|
---
|
|
drivers/net/wireless/bcmdhd/dhd_debug.c | 52 +++++++++++++++++--------
|
|
drivers/net/wireless/bcmdhd/include/event_log.h | 1 +
|
|
2 files changed, 37 insertions(+), 16 deletions(-)
|
|
|
|
diff --git a/drivers/net/wireless/bcmdhd/dhd_debug.c b/drivers/net/wireless/bcmdhd/dhd_debug.c
|
|
index 3c45ced1ddc4f..70f4e2df3b752 100644
|
|
--- a/drivers/net/wireless/bcmdhd/dhd_debug.c
|
|
+++ b/drivers/net/wireless/bcmdhd/dhd_debug.c
|
|
@@ -394,6 +394,12 @@ dhd_dbg_custom_evnt_handler(dhd_pub_t *dhdp, event_log_hdr_t *hdr, uint32 *data)
|
|
wl_log_id.t = *data;
|
|
if (wl_log_id.version != DIAG_VERSION) return BCME_VERSION;
|
|
|
|
+ /* custom event log should at least contain a wl_event_log_id_ver_t
|
|
+ * header and an arm cycle count
|
|
+ */
|
|
+ if (hdr->count < 2)
|
|
+ return BCME_BADLEN;
|
|
+
|
|
ts_hdr = (void *)data - sizeof(event_log_hdr_t);
|
|
if (ts_hdr->tag == EVENT_LOG_TAG_TS) {
|
|
ts_data = (uint32 *)ts_hdr - ts_hdr->count;
|
|
@@ -624,7 +630,8 @@ dhd_dbg_msgtrace_log_parser(dhd_pub_t *dhdp, void *event_data,
|
|
msgtrace_hdr_t *hdr;
|
|
char *data;
|
|
int id;
|
|
- uint32 hdrlen = sizeof(event_log_hdr_t);
|
|
+ const uint32 log_hdr_len = sizeof(event_log_hdr_t);
|
|
+ uint32 log_pyld_len;
|
|
static uint32 seqnum_prev = 0;
|
|
event_log_hdr_t *log_hdr;
|
|
bool event_type = FALSE;
|
|
@@ -632,6 +639,13 @@ dhd_dbg_msgtrace_log_parser(dhd_pub_t *dhdp, void *event_data,
|
|
dll_t list_head, *cur;
|
|
loglist_item_t *log_item;
|
|
|
|
+ /* log trace event consists of
|
|
+ * msgtrace header
|
|
+ * event log block header
|
|
+ * event log payload
|
|
+ */
|
|
+ if (datalen <= MSGTRACE_HDRLEN + EVENT_LOG_BLOCK_HDRLEN)
|
|
+ return;
|
|
hdr = (msgtrace_hdr_t *)event_data;
|
|
data = (char *)event_data + MSGTRACE_HDRLEN;
|
|
datalen -= MSGTRACE_HDRLEN;
|
|
@@ -640,30 +654,36 @@ dhd_dbg_msgtrace_log_parser(dhd_pub_t *dhdp, void *event_data,
|
|
return;
|
|
|
|
/* XXX: skip the meaningless pktlen/count and timestamp */
|
|
- data += 8;
|
|
- datalen -= 8;
|
|
+ data += EVENT_LOG_BLOCK_HDRLEN;
|
|
+ datalen -= EVENT_LOG_BLOCK_HDRLEN;
|
|
|
|
/* start from the end and walk through the packet */
|
|
dll_init(&list_head);
|
|
- while (datalen > 0) {
|
|
- log_hdr = (event_log_hdr_t *)(data + datalen - hdrlen);
|
|
- /* pratially overwritten entries */
|
|
- if ((uint32 *)log_hdr - (uint32 *)data < log_hdr->count)
|
|
- break;
|
|
- /* end of frame? */
|
|
+ while (datalen > log_hdr_len) {
|
|
+ log_hdr = (event_log_hdr_t *)(data + datalen - log_hdr_len);
|
|
+ /* skip zero padding at end of frame */
|
|
if (log_hdr->tag == EVENT_LOG_TAG_NULL) {
|
|
- log_hdr--;
|
|
- datalen -= hdrlen;
|
|
+ datalen -= log_hdr_len;
|
|
continue;
|
|
}
|
|
+
|
|
+ /* Check argument count, any event log should contain at least
|
|
+ * one argument (4 bytes) for arm cycle count and up to 16
|
|
+ * arguments
|
|
+ */
|
|
+ if ((log_hdr->count == 0) || (log_hdr->count > MAX_NO_OF_ARG))
|
|
+ break;
|
|
+
|
|
+ log_pyld_len = log_hdr->count * DATA_UNIT_FOR_LOG_CNT;
|
|
+ /* log data should not cross event data boundary */
|
|
+ if (((char *)log_hdr - data) < log_pyld_len)
|
|
+ break;
|
|
+
|
|
/* skip 4 bytes time stamp packet */
|
|
if (log_hdr->tag == EVENT_LOG_TAG_TS) {
|
|
- datalen -= log_hdr->count * 4 + hdrlen;
|
|
- log_hdr -= log_hdr->count + hdrlen / 4;
|
|
+ datalen -= log_pyld_len + log_hdr_len;
|
|
continue;
|
|
}
|
|
- if (log_hdr->count > MAX_NO_OF_ARG)
|
|
- break;
|
|
if (!(log_item = MALLOC(dhdp->osh, sizeof(*log_item)))) {
|
|
DHD_ERROR(("%s allocating log list item failed\n",
|
|
__FUNCTION__));
|
|
@@ -671,7 +691,7 @@ dhd_dbg_msgtrace_log_parser(dhd_pub_t *dhdp, void *event_data,
|
|
}
|
|
log_item->hdr = log_hdr;
|
|
dll_insert(&log_item->list, &list_head);
|
|
- datalen -= (log_hdr->count * 4 + hdrlen);
|
|
+ datalen -= (log_pyld_len + log_hdr_len);
|
|
}
|
|
|
|
while (!dll_empty(&list_head)) {
|
|
diff --git a/drivers/net/wireless/bcmdhd/include/event_log.h b/drivers/net/wireless/bcmdhd/include/event_log.h
|
|
index 6f0bbc4e40ec1..3964d203d2fb9 100644
|
|
--- a/drivers/net/wireless/bcmdhd/include/event_log.h
|
|
+++ b/drivers/net/wireless/bcmdhd/include/event_log.h
|
|
@@ -141,6 +141,7 @@
|
|
#define LOGSTRS_MAGIC 0x4C4F4753
|
|
#define LOGSTRS_VERSION 0x1
|
|
|
|
+#define EVENT_LOG_BLOCK_HDRLEN 8
|
|
|
|
/*
|
|
* There are multiple levels of objects define here:
|