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92 lines
3.2 KiB
Diff
92 lines
3.2 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, 23 May 2023 23:23:11 +0000
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Subject: [PATCH] Fix some OOB errors in BTM parsing
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Some HCI BLE events are missing bounds checks, leading to possible OOB
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access. Add the appropriate bounds checks on the packets.
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Bug: 279169188
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Test: atest bluetooth_test_gd_unit, net_test_stack_btm
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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:949eb6b355f1bdcfb5567ebe1b7f00a61b6fb066)
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Merged-In: Icf2953c687d9c4e2ca9629474151b8deab6c5f57
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Change-Id: Icf2953c687d9c4e2ca9629474151b8deab6c5f57
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---
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stack/btm/btm_ble_gap.c | 25 ++++++++++++++++++-------
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stack/btu/btu_hcif.c | 7 +++++++
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2 files changed, 25 insertions(+), 7 deletions(-)
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diff --git a/stack/btm/btm_ble_gap.c b/stack/btm/btm_ble_gap.c
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index a758f991f..591034ddf 100644
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--- a/stack/btm/btm_ble_gap.c
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+++ b/stack/btm/btm_ble_gap.c
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@@ -2687,20 +2687,28 @@ void btm_ble_process_adv_pkt (UINT8 data_len, UINT8 *data)
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UINT8 *p = data;
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UINT8 evt_type, addr_type, num_reports, pkt_data_len;
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INT8 rssi;
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+ size_t bytes_to_process;
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/* Only process the results if the inquiry is still active */
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if (!BTM_BLE_IS_SCAN_ACTIVE(btm_cb.ble_ctr_cb.scan_activity))
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return;
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+ bytes_to_process = 1;
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+
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+ if (data_len < bytes_to_process) {
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+ BTM_TRACE_ERROR("Malformed LE advertising packet: not enough room for num reports");
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+ return;
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+ }
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+
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/* Extract the number of reports in this event. */
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STREAM_TO_UINT8(num_reports, p);
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while (num_reports--)
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{
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- if (p > data + data_len)
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- {
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- // TODO(jpawlowski): we should crash the stack here
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- BTM_TRACE_ERROR("Malformed LE Advertising Report Event from controller");
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+ bytes_to_process += 9;
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+
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+ if (data_len < bytes_to_process) {
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+ BTM_TRACE_ERROR("Malformed LE advertising packet: not enough room for metadata");
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return;
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}
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@@ -2712,9 +2720,12 @@ void btm_ble_process_adv_pkt (UINT8 data_len, UINT8 *data)
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UINT8 *pkt_data = p;
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p += pkt_data_len; /* Advance to the the rssi byte */
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- if (p > data + data_len - sizeof(rssi))
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- {
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- BTM_TRACE_ERROR("Invalid pkt_data_len: %d", pkt_data_len);
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+
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+ // include rssi for this check
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+ bytes_to_process += pkt_data_len + 1;
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+ if (data_len < bytes_to_process) {
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+ BTM_TRACE_ERROR("Malformed LE advertising packet: not enough room for "
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+ "packet data and/or RSSI");
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return;
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}
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diff --git a/stack/btu/btu_hcif.c b/stack/btu/btu_hcif.c
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index 4851e53ad..6a219b4c7 100644
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--- a/stack/btu/btu_hcif.c
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+++ b/stack/btu/btu_hcif.c
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@@ -1794,6 +1794,13 @@ static void btu_ble_data_length_change_evt(UINT8 *p, UINT16 evt_len)
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return;
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}
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+ // 2 bytes each for handle, tx_data_len, TxTimer, rx_data_len
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+ if (evt_len < 8)
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+ {
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+ LOG_ERROR(LOG_TAG, "Event packet too short");
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+ return;
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+ }
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+
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STREAM_TO_UINT16(handle, p);
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STREAM_TO_UINT16(tx_data_len, p);
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p += 2; /* Skip the TxTimer */
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