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88 lines
2.8 KiB
Diff
88 lines
2.8 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, 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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main/Android.mk | 2 ++
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stack/Android.mk | 5 +++--
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stack/btm/btm_ble.c | 3 ++-
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3 files changed, 7 insertions(+), 3 deletions(-)
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diff --git a/main/Android.mk b/main/Android.mk
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index 2286997e8..985851add 100644
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--- a/main/Android.mk
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+++ b/main/Android.mk
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@@ -52,12 +52,14 @@ LOCAL_C_INCLUDES+= . \
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$(LOCAL_PATH)/../audio_a2dp_hw \
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$(LOCAL_PATH)/../utils/include \
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$(bluetooth_C_INCLUDES) \
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+ external/boringssl \
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external/tinyxml2 \
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external/zlib \
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$(call include-path-for, audio-utils)
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LOCAL_SHARED_LIBRARIES := \
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libcutils \
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+ libcrypto \
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libdl \
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liblog \
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libz \
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diff --git a/stack/Android.mk b/stack/Android.mk
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index 4c77e8dd7..49f43fbc5 100644
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--- a/stack/Android.mk
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+++ b/stack/Android.mk
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@@ -33,7 +33,8 @@ LOCAL_C_INCLUDES:= \
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$(LOCAL_PATH)/../bta/sys \
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$(LOCAL_PATH)/../utils/include \
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$(LOCAL_PATH)/../ \
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- $(bluetooth_C_INCLUDES)
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+ $(bluetooth_C_INCLUDES) \
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+ external/boringssl
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LOCAL_SRC_FILES:= \
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./a2dp/a2d_api.c \
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@@ -154,7 +155,7 @@ LOCAL_SRC_FILES:= \
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LOCAL_MODULE := libbt-stack
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LOCAL_STATIC_LIBRARIES := libbt-hci
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-LOCAL_SHARED_LIBRARIES := libcutils
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+LOCAL_SHARED_LIBRARIES := libcutils libcrypto
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LOCAL_CFLAGS += $(bluetooth_CFLAGS)
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diff --git a/stack/btm/btm_ble.c b/stack/btm/btm_ble.c
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index 6bb85a4ce..c6e699d49 100644
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--- a/stack/btm/btm_ble.c
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+++ b/stack/btm/btm_ble.c
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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 "smp_api.h"
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@@ -2282,7 +2283,7 @@ BOOLEAN BTM_BleVerifySignature (BD_ADDR bd_addr, UINT8 *p_orig, UINT16 len, UINT
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if (aes_cipher_msg_auth_code(p_rec->ble.keys.pcsrk, p_orig, len, BTM_CMAC_TLEN_SIZE, p_mac))
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{
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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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{
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btm_ble_increment_sign_ctr(bd_addr, FALSE);
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verified = TRUE;
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