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118 lines
3.8 KiB
Diff
118 lines
3.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Hui Peng <phui@google.com>
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Date: Fri, 15 Dec 2023 22:55:33 +0000
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Subject: [PATCH] Reland: Fix an OOB write bug in attp_build_value_cmd
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This is a backport of I291fd665a68d90813b8c21c80d23cc438f84f285
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Bug: 295887535
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Bug: 315127634
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Test: m com.android.btservices
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Test: atest net_test_stack_gatt
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Ignore-AOSP-First: security
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:70f7ff2b34e6683301c9c6cd021e1ddef76c5b1c)
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Merged-In: Ieffac6db5c6359b071efc599f7a70de609b80b72
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Change-Id: Ieffac6db5c6359b071efc599f7a70de609b80b72
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---
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stack/gatt/att_protocol.c | 58 +++++++++++++++++++++++++++++++--------
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1 file changed, 47 insertions(+), 11 deletions(-)
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diff --git a/stack/gatt/att_protocol.c b/stack/gatt/att_protocol.c
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index 1e9948185..b7b835452 100644
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--- a/stack/gatt/att_protocol.c
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+++ b/stack/gatt/att_protocol.c
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@@ -281,46 +281,82 @@ BT_HDR *attp_build_opcode_cmd(UINT8 op_code)
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BT_HDR *attp_build_value_cmd (UINT16 payload_size, UINT8 op_code, UINT16 handle,
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UINT16 offset, UINT16 len, UINT8 *p_data)
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{
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- UINT8 *p, *pp, pair_len, *p_pair_len;
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+ UINT8 *p, *pp, *p_pair_len;
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+ size_t pair_len;
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+ size_t size_now = 1;
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+
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+#define CHECK_SIZE() \
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+ do \
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+ { \
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+ if (size_now > payload_size) \
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+ { \
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+ GATT_TRACE_ERROR("payload size too small"); \
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+ osi_free(p_buf); \
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+ return NULL; \
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+ } \
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+ } while (false)
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+
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BT_HDR *p_buf =
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(BT_HDR *)osi_malloc(sizeof(BT_HDR) + payload_size + L2CAP_MIN_OFFSET);
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p = pp = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
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+
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+ CHECK_SIZE();
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UINT8_TO_STREAM(p, op_code);
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p_buf->offset = L2CAP_MIN_OFFSET;
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- p_buf->len = 1;
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if (op_code == GATT_RSP_READ_BY_TYPE) {
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- p_pair_len = p;
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+ p_pair_len = p++;
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pair_len = len + 2;
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- UINT8_TO_STREAM (p, pair_len);
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- p_buf->len += 1;
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+ size_now += 1;
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+ CHECK_SIZE();
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+ // this field will be backfilled in the end of this function
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}
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+
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if (op_code != GATT_RSP_READ_BLOB && op_code != GATT_RSP_READ) {
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+ size_now += 2;
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+ CHECK_SIZE();
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UINT16_TO_STREAM (p, handle);
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- p_buf->len += 2;
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}
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if (op_code == GATT_REQ_PREPARE_WRITE ||op_code == GATT_RSP_PREPARE_WRITE) {
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+ size_now += 2;
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+ CHECK_SIZE();
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UINT16_TO_STREAM (p, offset);
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- p_buf->len += 2;
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}
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if (len > 0 && p_data != NULL) {
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/* ensure data not exceed MTU size */
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- if (payload_size - p_buf->len < len) {
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- len = payload_size - p_buf->len;
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+ if (payload_size - size_now < len) {
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+ len = payload_size - size_now;
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/* update handle value pair length */
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if (op_code == GATT_RSP_READ_BY_TYPE)
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- *p_pair_len = (len + 2);
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+ pair_len = (len + 2);
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GATT_TRACE_WARNING("attribute value too long, to be truncated to %d", len);
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}
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+ size_now += len;
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+ CHECK_SIZE();
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ARRAY_TO_STREAM(p, p_data, len);
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- p_buf->len += len;
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}
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+ // backfill pair len field
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+ if (op_code == GATT_RSP_READ_BY_TYPE)
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+ {
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+ if (pair_len > UINT8_MAX)
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+ {
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+ GATT_TRACE_ERROR("pair_len greater than %d", UINT8_MAX);
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+ osi_free(p_buf);
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+ return NULL;
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+ }
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+
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+ *p_pair_len = (uint8_t)pair_len;
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+ }
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+
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+#undef CHECK_SIZE
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+
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+ p_buf->len = (uint16_t)size_now;
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return p_buf;
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}
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