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48 lines
1.7 KiB
Diff
48 lines
1.7 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: Sat, 1 Oct 2016 05:11:44 -0400
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Subject: [PATCH] make __stack_chk_guard read-only at runtime
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---
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libc/bionic/__libc_init_main_thread.cpp | 14 +++++++++++---
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1 file changed, 11 insertions(+), 3 deletions(-)
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diff --git a/libc/bionic/__libc_init_main_thread.cpp b/libc/bionic/__libc_init_main_thread.cpp
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index efa7dee57..78d25fd97 100644
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--- a/libc/bionic/__libc_init_main_thread.cpp
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+++ b/libc/bionic/__libc_init_main_thread.cpp
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@@ -28,22 +28,30 @@
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#include "libc_init_common.h"
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+#include <limits.h>
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+#include <sys/mman.h>
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+
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+#include <async_safe/log.h>
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+
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#include "private/KernelArgumentBlock.h"
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#include "private/bionic_arc4random.h"
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#include "private/bionic_auxv.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_ssp.h"
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#include "pthread_internal.h"
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extern "C" int __set_tls(void* ptr);
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extern "C" int __set_tid_address(int* tid_address);
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// Declared in "private/bionic_ssp.h".
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-uintptr_t __stack_chk_guard = 0;
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+__attribute__((aligned(PAGE_SIZE)))
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+uintptr_t __stack_chk_guard[PAGE_SIZE / sizeof(uintptr_t)] = {0};
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void __libc_init_global_stack_chk_guard(KernelArgumentBlock& args) {
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- __libc_safe_arc4random_buf(&__stack_chk_guard, sizeof(__stack_chk_guard), args);
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+ __libc_safe_arc4random_buf(&__stack_chk_guard[0], sizeof(__stack_chk_guard[0]), args);
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+ if (mprotect(__stack_chk_guard, sizeof(__stack_chk_guard), PROT_READ) == -1) {
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+ async_safe_fatal("mprotect __stack_chk_guard: %s", strerror(errno));
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+ }
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}
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// Setup for the main thread. For dynamic executables, this is called by the
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