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78 lines
3.1 KiB
Diff
78 lines
3.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Dmitry Muhomor <muhomor.dmitry@gmail.com>
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Date: Wed, 1 Nov 2023 21:27:18 +0200
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Subject: [PATCH] never enable GWP-ASan
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It weakens hardened_malloc protections, especially when memory tagging is enabled.
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---
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libc/bionic/gwp_asan_wrappers.h | 7 -------
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libc/bionic/malloc_common.cpp | 8 --------
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libc/bionic/malloc_common_dynamic.cpp | 10 ----------
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3 files changed, 25 deletions(-)
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diff --git a/libc/bionic/gwp_asan_wrappers.h b/libc/bionic/gwp_asan_wrappers.h
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index 219da9fc5..9053d4aa4 100644
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--- a/libc/bionic/gwp_asan_wrappers.h
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+++ b/libc/bionic/gwp_asan_wrappers.h
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@@ -35,13 +35,6 @@
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#include "private/bionic_globals.h"
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#include "private/bionic_malloc_dispatch.h"
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-// Enable GWP-ASan, used by android_mallopt. Should always be called in a
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-// single-threaded context.
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-bool EnableGwpAsan(const android_mallopt_gwp_asan_options_t& options);
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-
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-// Hooks for libc to possibly install GWP-ASan.
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-bool MaybeInitGwpAsanFromLibc(libc_globals* globals);
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-
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// Returns whether GWP-ASan is the provided dispatch table pointer. Used in
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// heapprofd's signal-initialization sequence to determine the intermediate
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// dispatch pointer to use when initing.
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diff --git a/libc/bionic/malloc_common.cpp b/libc/bionic/malloc_common.cpp
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index 1ab4861af..9363d7b63 100644
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--- a/libc/bionic/malloc_common.cpp
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+++ b/libc/bionic/malloc_common.cpp
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@@ -340,14 +340,6 @@ extern "C" bool android_mallopt(int opcode, void* arg, size_t arg_size) {
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if (opcode == M_SET_ALLOCATION_LIMIT_BYTES) {
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return LimitEnable(arg, arg_size);
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}
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- if (opcode == M_INITIALIZE_GWP_ASAN) {
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- if (arg == nullptr || arg_size != sizeof(android_mallopt_gwp_asan_options_t)) {
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- errno = EINVAL;
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- return false;
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- }
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-
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- return EnableGwpAsan(*reinterpret_cast<android_mallopt_gwp_asan_options_t*>(arg));
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- }
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if (opcode == M_MEMTAG_STACK_IS_ON) {
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if (arg == nullptr || arg_size != sizeof(bool)) {
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errno = EINVAL;
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diff --git a/libc/bionic/malloc_common_dynamic.cpp b/libc/bionic/malloc_common_dynamic.cpp
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index 2cafe9249..84be92ee1 100644
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--- a/libc/bionic/malloc_common_dynamic.cpp
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+++ b/libc/bionic/malloc_common_dynamic.cpp
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@@ -383,8 +383,6 @@ static void MallocInitImpl(libc_globals* globals) {
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char prop[PROP_VALUE_MAX];
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char* options = prop;
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- MaybeInitGwpAsanFromLibc(globals);
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-
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#if defined(USE_SCUDO)
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__libc_shared_globals()->scudo_stack_depot = __scudo_get_stack_depot_addr();
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__libc_shared_globals()->scudo_region_info = __scudo_get_region_info_addr();
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@@ -533,14 +531,6 @@ extern "C" bool android_mallopt(int opcode, void* arg, size_t arg_size) {
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}
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return FreeMallocLeakInfo(reinterpret_cast<android_mallopt_leak_info_t*>(arg));
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}
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- if (opcode == M_INITIALIZE_GWP_ASAN) {
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- if (arg == nullptr || arg_size != sizeof(android_mallopt_gwp_asan_options_t)) {
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- errno = EINVAL;
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- return false;
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- }
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-
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- return EnableGwpAsan(*reinterpret_cast<android_mallopt_gwp_asan_options_t*>(arg));
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- }
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if (opcode == M_MEMTAG_STACK_IS_ON) {
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if (arg == nullptr || arg_size != sizeof(bool)) {
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errno = EINVAL;
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