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108 lines
4.3 KiB
Diff
108 lines
4.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Brian Delwiche <delwiche@google.com>
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Date: Tue, 11 Oct 2022 21:23:22 +0000
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Subject: [PATCH] Prevent use-after-free of HID reports
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BTA sends the the HID report pointer to BTIF and deallocates it immediately.
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This is now prevented by providing a deep copy callback function for HID
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reports when tranferring context from BTA to BTIF.
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This is a backport of change Icef7a7ed1185b4283ee4fe4f812ca154d8f1b825,
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already merged on T for b/227620181.
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Bug: 228837201
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Test: Validated against researcher POC, ran BT unit tests, played audio
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manually.
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Tag: #security
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Ignore-AOSP-First: Security
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:874c495c886cd8722625756dc5fd0634b16b4f42)
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Merged-In: Ib837f395883de2369207f1b3b974d6bff02dcb19
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Change-Id: Ib837f395883de2369207f1b3b974d6bff02dcb19
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---
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btif/src/btif_hh.cc | 50 ++++++++++++++++++++++++++++++++++++++++-----
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1 file changed, 45 insertions(+), 5 deletions(-)
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diff --git a/btif/src/btif_hh.cc b/btif/src/btif_hh.cc
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index c5a90218a..b6441e1cc 100644
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--- a/btif/src/btif_hh.cc
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+++ b/btif/src/btif_hh.cc
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@@ -1073,6 +1073,38 @@ static void btif_hh_upstreams_evt(uint16_t event, char* p_param) {
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}
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}
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+/*******************************************************************************
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+ *
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+ * Function btif_hh_hsdata_rpt_copy_cb
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+ *
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+ * Description Deep copies the tBTA_HH_HSDATA structure
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+ *
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+ * Returns void
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+ *
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+ ******************************************************************************/
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+
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+static void btif_hh_hsdata_rpt_copy_cb(uint16_t event, char* p_dest,
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+ char* p_src) {
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+ tBTA_HH_HSDATA* p_dst_data = (tBTA_HH_HSDATA*)p_dest;
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+ tBTA_HH_HSDATA* p_src_data = (tBTA_HH_HSDATA*)p_src;
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+ BT_HDR* hdr;
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+
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+ if (!p_src) {
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+ BTIF_TRACE_ERROR("%s: Nothing to copy", __func__);
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+ return;
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+ }
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+
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+ memcpy(p_dst_data, p_src_data, sizeof(tBTA_HH_HSDATA));
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+
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+ hdr = p_src_data->rsp_data.p_rpt_data;
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+ if (hdr != NULL) {
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+ uint8_t* p_data = ((uint8_t*)p_dst_data) + sizeof(tBTA_HH_HSDATA);
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+ memcpy(p_data, hdr, BT_HDR_SIZE + hdr->offset + hdr->len);
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+
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+ p_dst_data->rsp_data.p_rpt_data = (BT_HDR*)p_data;
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+ }
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+}
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+
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/*******************************************************************************
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*
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* Function bte_hh_evt
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@@ -1086,6 +1118,7 @@ static void btif_hh_upstreams_evt(uint16_t event, char* p_param) {
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void bte_hh_evt(tBTA_HH_EVT event, tBTA_HH* p_data) {
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bt_status_t status;
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int param_len = 0;
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+ tBTIF_COPY_CBACK* p_copy_cback = NULL;
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if (BTA_HH_ENABLE_EVT == event)
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param_len = sizeof(tBTA_HH_STATUS);
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@@ -1097,11 +1130,18 @@ void bte_hh_evt(tBTA_HH_EVT event, tBTA_HH* p_data) {
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param_len = sizeof(tBTA_HH_CBDATA);
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else if (BTA_HH_GET_DSCP_EVT == event)
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param_len = sizeof(tBTA_HH_DEV_DSCP_INFO);
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- else if ((BTA_HH_GET_PROTO_EVT == event) || (BTA_HH_GET_RPT_EVT == event) ||
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- (BTA_HH_GET_IDLE_EVT == event))
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+ else if ((BTA_HH_GET_PROTO_EVT == event) || (BTA_HH_GET_IDLE_EVT == event))
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+ param_len = sizeof(tBTA_HH_HSDATA);
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+ else if (BTA_HH_GET_RPT_EVT == event) {
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+ BT_HDR* hdr = p_data->hs_data.rsp_data.p_rpt_data;
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param_len = sizeof(tBTA_HH_HSDATA);
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- else if ((BTA_HH_SET_PROTO_EVT == event) || (BTA_HH_SET_RPT_EVT == event) ||
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- (BTA_HH_VC_UNPLUG_EVT == event) || (BTA_HH_SET_IDLE_EVT == event))
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+
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+ if (hdr != NULL) {
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+ p_copy_cback = btif_hh_hsdata_rpt_copy_cb;
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+ param_len += BT_HDR_SIZE + hdr->offset + hdr->len;
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+ }
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+ } else if ((BTA_HH_SET_PROTO_EVT == event) || (BTA_HH_SET_RPT_EVT == event) ||
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+ (BTA_HH_VC_UNPLUG_EVT == event) || (BTA_HH_SET_IDLE_EVT == event))
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param_len = sizeof(tBTA_HH_CBDATA);
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else if ((BTA_HH_ADD_DEV_EVT == event) || (BTA_HH_RMV_DEV_EVT == event))
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param_len = sizeof(tBTA_HH_DEV_INFO);
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@@ -1110,7 +1150,7 @@ void bte_hh_evt(tBTA_HH_EVT event, tBTA_HH* p_data) {
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/* switch context to btif task context (copy full union size for convenience)
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*/
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status = btif_transfer_context(btif_hh_upstreams_evt, (uint16_t)event,
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- (char*)p_data, param_len, NULL);
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+ (char*)p_data, param_len, p_copy_cback);
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/* catch any failed context transfers */
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ASSERTC(status == BT_STATUS_SUCCESS, "context transfer failed", status);
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