mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-14 10:24:32 -05:00
88 lines
3.2 KiB
Diff
88 lines
3.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Micay <danielmicay@gmail.com>
|
|
Date: Wed, 27 Jan 2016 18:02:15 -0500
|
|
Subject: [PATCH] add XOR mangling mitigation for thread-local dtors
|
|
|
|
memtag_stack struct member is required to be at its exact position by static_assert below.
|
|
|
|
Signed-off-by: anupritaisno1 <www.anuprita804@gmail.com>
|
|
---
|
|
libc/bionic/__cxa_thread_atexit_impl.cpp | 8 +++++---
|
|
libc/bionic/libc_init_common.cpp | 2 ++
|
|
libc/private/bionic_globals.h | 1 +
|
|
3 files changed, 8 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/libc/bionic/__cxa_thread_atexit_impl.cpp b/libc/bionic/__cxa_thread_atexit_impl.cpp
|
|
index 99077c101..74608513e 100644
|
|
--- a/libc/bionic/__cxa_thread_atexit_impl.cpp
|
|
+++ b/libc/bionic/__cxa_thread_atexit_impl.cpp
|
|
@@ -13,15 +13,17 @@
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
+#include <stdint.h>
|
|
#include <sys/cdefs.h>
|
|
|
|
#include <private/bionic_defs.h>
|
|
+#include <private/bionic_globals.h>
|
|
|
|
#include "pthread_internal.h"
|
|
|
|
class thread_local_dtor {
|
|
public:
|
|
- void (*func) (void *);
|
|
+ uintptr_t func;
|
|
void *arg;
|
|
void *dso_handle; // unused...
|
|
thread_local_dtor* next;
|
|
@@ -35,7 +37,7 @@ __BIONIC_WEAK_FOR_NATIVE_BRIDGE
|
|
int __cxa_thread_atexit_impl(void (*func) (void *), void *arg, void *dso_handle) {
|
|
thread_local_dtor* dtor = new thread_local_dtor();
|
|
|
|
- dtor->func = func;
|
|
+ dtor->func = __libc_globals->dtor_cookie ^ reinterpret_cast<uintptr_t>(func);
|
|
dtor->arg = arg;
|
|
dtor->dso_handle = dso_handle;
|
|
|
|
@@ -54,7 +56,7 @@ extern "C" __LIBC_HIDDEN__ void __cxa_thread_finalize() {
|
|
thread_local_dtor* current = thread->thread_local_dtors;
|
|
thread->thread_local_dtors = current->next;
|
|
|
|
- current->func(current->arg);
|
|
+ (reinterpret_cast<void (*)(void*)>(__libc_globals->dtor_cookie ^ current->func))(current->arg);
|
|
if (__loader_remove_thread_local_dtor != nullptr) {
|
|
__loader_remove_thread_local_dtor(current->dso_handle);
|
|
}
|
|
diff --git a/libc/bionic/libc_init_common.cpp b/libc/bionic/libc_init_common.cpp
|
|
index 51f7ce9ce..31d45724d 100644
|
|
--- a/libc/bionic/libc_init_common.cpp
|
|
+++ b/libc/bionic/libc_init_common.cpp
|
|
@@ -46,6 +46,7 @@
|
|
#include "heap_tagging.h"
|
|
#include "private/ScopedPthreadMutexLocker.h"
|
|
#include "private/WriteProtected.h"
|
|
+#include "private/bionic_arc4random.h"
|
|
#include "private/bionic_defs.h"
|
|
#include "private/bionic_globals.h"
|
|
#include "private/bionic_tls.h"
|
|
@@ -70,6 +71,7 @@ void __libc_init_globals() {
|
|
__libc_globals.mutate([](libc_globals* globals) {
|
|
__libc_init_vdso(globals);
|
|
__libc_init_setjmp_cookie(globals);
|
|
+ arc4random_buf(&globals->dtor_cookie, sizeof(globals->dtor_cookie));
|
|
});
|
|
}
|
|
|
|
diff --git a/libc/private/bionic_globals.h b/libc/private/bionic_globals.h
|
|
index 598918f09..fcf049899 100644
|
|
--- a/libc/private/bionic_globals.h
|
|
+++ b/libc/private/bionic_globals.h
|
|
@@ -51,6 +51,7 @@ struct libc_globals {
|
|
_Atomic(bool) memtag_stack;
|
|
_Atomic(bool) decay_time_enabled;
|
|
_Atomic(bool) memtag;
|
|
+ long dtor_cookie;
|
|
|
|
// In order to allow a complete switch between dispatch tables without
|
|
// the need for copying each function by function in the structure,
|