mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-24 15:09:34 -05:00
48 lines
1.7 KiB
Diff
48 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Micay <danielmicay@gmail.com>
|
|
Date: Sat, 1 Oct 2016 05:11:44 -0400
|
|
Subject: [PATCH] make __stack_chk_guard read-only at runtime
|
|
|
|
---
|
|
libc/bionic/__libc_init_main_thread.cpp | 14 +++++++++++---
|
|
1 file changed, 11 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/libc/bionic/__libc_init_main_thread.cpp b/libc/bionic/__libc_init_main_thread.cpp
|
|
index efa7dee57..78d25fd97 100644
|
|
--- a/libc/bionic/__libc_init_main_thread.cpp
|
|
+++ b/libc/bionic/__libc_init_main_thread.cpp
|
|
@@ -28,22 +28,30 @@
|
|
|
|
#include "libc_init_common.h"
|
|
|
|
+#include <limits.h>
|
|
+#include <sys/mman.h>
|
|
+
|
|
+#include <async_safe/log.h>
|
|
+
|
|
#include "private/KernelArgumentBlock.h"
|
|
#include "private/bionic_arc4random.h"
|
|
#include "private/bionic_auxv.h"
|
|
#include "private/bionic_defs.h"
|
|
#include "private/bionic_globals.h"
|
|
-#include "private/bionic_ssp.h"
|
|
#include "pthread_internal.h"
|
|
|
|
extern "C" int __set_tls(void* ptr);
|
|
extern "C" int __set_tid_address(int* tid_address);
|
|
|
|
// Declared in "private/bionic_ssp.h".
|
|
-uintptr_t __stack_chk_guard = 0;
|
|
+__attribute__((aligned(PAGE_SIZE)))
|
|
+uintptr_t __stack_chk_guard[PAGE_SIZE / sizeof(uintptr_t)] = {0};
|
|
|
|
void __libc_init_global_stack_chk_guard(KernelArgumentBlock& args) {
|
|
- __libc_safe_arc4random_buf(&__stack_chk_guard, sizeof(__stack_chk_guard), args);
|
|
+ __libc_safe_arc4random_buf(&__stack_chk_guard[0], sizeof(__stack_chk_guard[0]), args);
|
|
+ if (mprotect(__stack_chk_guard, sizeof(__stack_chk_guard), PROT_READ) == -1) {
|
|
+ async_safe_fatal("mprotect __stack_chk_guard: %s", strerror(errno));
|
|
+ }
|
|
}
|
|
|
|
// Setup for the main thread. For dynamic executables, this is called by the
|