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https://github.com/Divested-Mobile/DivestOS-Build.git
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57 lines
1.9 KiB
Diff
57 lines
1.9 KiB
Diff
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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, 3 Oct 2023 21:27:49 +0000
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Subject: [PATCH] Fix timing attack in BTM_BleVerifySignature
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BTM_BleVerifySignature uses a stock memcmp, allowing signature contents
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to be deduced through a side-channel attack.
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Change to CRYPTO_memcmp, which is hardened against this attack, to
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eliminate this attack.
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Bug: 274478807
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Test: atest bluetooth_test_gd_unit
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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:fcd1c44f7c4bf431dd6a6902d74c045174bd00ce)
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Merged-In: I41a9b586d663d2ad4694222ae451d2d30a428a3c
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Change-Id: I41a9b586d663d2ad4694222ae451d2d30a428a3c
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---
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stack/Android.bp | 1 +
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stack/btm/btm_ble.cc | 3 ++-
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2 files changed, 3 insertions(+), 1 deletion(-)
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diff --git a/stack/Android.bp b/stack/Android.bp
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index 03e2c940b..93c989ff5 100644
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--- a/stack/Android.bp
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+++ b/stack/Android.bp
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@@ -179,6 +179,7 @@ cc_library_static {
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"libcutils",
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"liblog",
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"libstatslog",
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+ "libcrypto",
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],
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required: [
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"libldacBT_enc",
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diff --git a/stack/btm/btm_ble.cc b/stack/btm/btm_ble.cc
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index 48f4496b1..82699286a 100644
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--- a/stack/btm/btm_ble.cc
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+++ b/stack/btm/btm_ble.cc
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@@ -41,6 +41,7 @@
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#include "hcimsgs.h"
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#include "log/log.h"
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#include "l2c_int.h"
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+#include "openssl/mem.h"
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#include "osi/include/log.h"
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#include "osi/include/osi.h"
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#include "smp_api.h"
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@@ -2261,7 +2262,7 @@ bool BTM_BleVerifySignature(const RawAddress& bd_addr, uint8_t* p_orig,
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if (aes_cipher_msg_auth_code(p_rec->ble.keys.pcsrk, p_orig, len,
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BTM_CMAC_TLEN_SIZE, p_mac)) {
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- if (memcmp(p_mac, p_comp, BTM_CMAC_TLEN_SIZE) == 0) {
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+ if (CRYPTO_memcmp(p_mac, p_comp, BTM_CMAC_TLEN_SIZE) == 0) {
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btm_ble_increment_sign_ctr(bd_addr, false);
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verified = true;
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}
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