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100 lines
3.1 KiB
Diff
100 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: Sun, 14 Aug 2022 15:13:01 +0300
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Subject: [PATCH] add a runtime option to disable hardened_malloc
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---
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libc/bionic/malloc_common.cpp | 50 +++++++++++++++++++++++++++
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libc/bionic/malloc_common.h | 1 +
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libc/bionic/malloc_common_dynamic.cpp | 4 +++
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3 files changed, 55 insertions(+)
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diff --git a/libc/bionic/malloc_common.cpp b/libc/bionic/malloc_common.cpp
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index 3c4884b2c..86e6fdcf9 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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@@ -393,6 +393,56 @@ static constexpr MallocDispatch __libc_malloc_default_dispatch __attribute__((un
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Malloc(malloc_info),
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};
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+#if defined(BOTH_H_MALLOC_AND_SCUDO)
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+
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+#define ScudoMalloc(function) scudo_ ## function
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+
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+static constexpr MallocDispatch __scudo_malloc_dispatch __attribute__((unused)) = {
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+ ScudoMalloc(calloc),
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+ ScudoMalloc(free),
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+ ScudoMalloc(mallinfo),
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+ ScudoMalloc(malloc),
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+ ScudoMalloc(malloc_usable_size),
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+ ScudoMalloc(memalign),
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+ ScudoMalloc(posix_memalign),
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+#if defined(HAVE_DEPRECATED_MALLOC_FUNCS)
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+ ScudoMalloc(pvalloc),
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+#endif
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+ ScudoMalloc(realloc),
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+#if defined(HAVE_DEPRECATED_MALLOC_FUNCS)
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+ ScudoMalloc(valloc),
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+#endif
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+ ScudoMalloc(malloc_iterate),
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+ ScudoMalloc(malloc_disable),
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+ ScudoMalloc(malloc_enable),
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+ ScudoMalloc(mallopt),
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+ ScudoMalloc(aligned_alloc),
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+ ScudoMalloc(malloc_info),
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+};
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+
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+static const MallocDispatch* native_allocator_dispatch;
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+
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+void InitNativeAllocatorDispatch(libc_globals* globals) {
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+ const bool hardened_impl = getenv("DISABLE_HARDENED_MALLOC") == nullptr;
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+
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+ const MallocDispatch* table = hardened_impl ?
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+ &__libc_malloc_default_dispatch :
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+ &__scudo_malloc_dispatch;
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+
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+ if (!hardened_impl) {
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+ globals->malloc_dispatch_table = __scudo_malloc_dispatch;
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+ globals->current_dispatch_table = &globals->malloc_dispatch_table;
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+ globals->default_dispatch_table = &globals->malloc_dispatch_table;
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+ }
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+
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+ native_allocator_dispatch = table;
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+}
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+
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+const MallocDispatch* NativeAllocatorDispatch() {
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+ return native_allocator_dispatch;
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+}
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+#else
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const MallocDispatch* NativeAllocatorDispatch() {
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return &__libc_malloc_default_dispatch;
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}
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+#endif
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diff --git a/libc/bionic/malloc_common.h b/libc/bionic/malloc_common.h
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index 8852c85a2..ef4b1a4be 100644
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--- a/libc/bionic/malloc_common.h
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+++ b/libc/bionic/malloc_common.h
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@@ -68,6 +68,7 @@ __END_DECLS
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#if defined(USE_SCUDO)
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#include "scudo.h"
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+void InitNativeAllocatorDispatch(libc_globals* globals);
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#endif
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#define BOTH_H_MALLOC_AND_SCUDO
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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 a6bf7a7bb..2cafe9249 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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@@ -376,6 +376,10 @@ extern "C" size_t __scudo_get_stack_depot_size();
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// Initializes memory allocation framework once per process.
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static void MallocInitImpl(libc_globals* globals) {
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+#if defined(BOTH_H_MALLOC_AND_SCUDO)
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+ InitNativeAllocatorDispatch(globals);
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+#endif
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+
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char prop[PROP_VALUE_MAX];
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char* options = prop;
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