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https://github.com/Divested-Mobile/DivestOS-Build.git
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85 lines
2.9 KiB
Diff
85 lines
2.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Micay <danielmicay@gmail.com>
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Date: Wed, 27 Jan 2016 18:02:15 -0500
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Subject: [PATCH] add XOR mangling mitigation for thread-local dtors
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---
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libc/bionic/__cxa_thread_atexit_impl.cpp | 8 +++++---
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libc/bionic/libc_init_common.cpp | 2 ++
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libc/private/bionic_globals.h | 1 +
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3 files changed, 8 insertions(+), 3 deletions(-)
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diff --git a/libc/bionic/__cxa_thread_atexit_impl.cpp b/libc/bionic/__cxa_thread_atexit_impl.cpp
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index 99077c101..74608513e 100644
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--- a/libc/bionic/__cxa_thread_atexit_impl.cpp
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+++ b/libc/bionic/__cxa_thread_atexit_impl.cpp
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@@ -13,15 +13,17 @@
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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+#include <stdint.h>
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#include <sys/cdefs.h>
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#include <private/bionic_defs.h>
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+#include <private/bionic_globals.h>
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#include "pthread_internal.h"
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class thread_local_dtor {
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public:
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- void (*func) (void *);
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+ uintptr_t func;
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void *arg;
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void *dso_handle; // unused...
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thread_local_dtor* next;
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@@ -35,7 +37,7 @@ __BIONIC_WEAK_FOR_NATIVE_BRIDGE
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int __cxa_thread_atexit_impl(void (*func) (void *), void *arg, void *dso_handle) {
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thread_local_dtor* dtor = new thread_local_dtor();
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- dtor->func = func;
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+ dtor->func = __libc_globals->dtor_cookie ^ reinterpret_cast<uintptr_t>(func);
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dtor->arg = arg;
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dtor->dso_handle = dso_handle;
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@@ -54,7 +56,7 @@ extern "C" __LIBC_HIDDEN__ void __cxa_thread_finalize() {
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thread_local_dtor* current = thread->thread_local_dtors;
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thread->thread_local_dtors = current->next;
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- current->func(current->arg);
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+ (reinterpret_cast<void (*)(void*)>(__libc_globals->dtor_cookie ^ current->func))(current->arg);
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if (__loader_remove_thread_local_dtor != nullptr) {
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__loader_remove_thread_local_dtor(current->dso_handle);
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}
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diff --git a/libc/bionic/libc_init_common.cpp b/libc/bionic/libc_init_common.cpp
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index b229cda2f..e928c02f1 100644
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--- a/libc/bionic/libc_init_common.cpp
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+++ b/libc/bionic/libc_init_common.cpp
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@@ -44,6 +44,7 @@
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#include <async_safe/log.h>
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#include "private/WriteProtected.h"
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+#include "private/bionic_arc4random.h"
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#include "private/bionic_defs.h"
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#include "private/bionic_globals.h"
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#include "private/bionic_tls.h"
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@@ -65,6 +66,7 @@ void __libc_init_globals() {
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__libc_globals.mutate([](libc_globals* globals) {
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__libc_init_vdso(globals);
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__libc_init_setjmp_cookie(globals);
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+ arc4random_buf(&globals->dtor_cookie, sizeof(globals->dtor_cookie));
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});
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}
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diff --git a/libc/private/bionic_globals.h b/libc/private/bionic_globals.h
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index d73079e33..4c296037b 100644
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--- a/libc/private/bionic_globals.h
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+++ b/libc/private/bionic_globals.h
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@@ -43,6 +43,7 @@
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struct libc_globals {
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vdso_entry vdso[VDSO_END];
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+ long dtor_cookie;
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long setjmp_cookie;
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// In order to allow a complete switch between dispatch tables without
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