mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-23 14:39:24 -05:00
1705545d22
TODO: - manifest - devices - a few small patches to rebase Signed-off-by: Tad <tad@spotco.us>
96 lines
3.3 KiB
Diff
96 lines
3.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Micay <danielmicay@gmail.com>
|
|
Date: Thu, 3 Dec 2015 12:58:31 -0500
|
|
Subject: [PATCH] add memory protection for pthread_atfork handlers
|
|
|
|
Signed-off-by: anupritaisno1 <www.anuprita804@gmail.com>
|
|
---
|
|
libc/bionic/pthread_atfork.cpp | 34 ++++++++++++++++++++++++++++++++--
|
|
1 file changed, 32 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/libc/bionic/pthread_atfork.cpp b/libc/bionic/pthread_atfork.cpp
|
|
index 6306052ee..d59f3ae54 100644
|
|
--- a/libc/bionic/pthread_atfork.cpp
|
|
+++ b/libc/bionic/pthread_atfork.cpp
|
|
@@ -47,6 +47,7 @@ struct atfork_t {
|
|
};
|
|
|
|
static atfork_t* pool;
|
|
+static atfork_t* page_list;
|
|
|
|
class atfork_list_t {
|
|
public:
|
|
@@ -160,13 +161,22 @@ void __bionic_atfork_run_parent() {
|
|
// __register_atfork is the name used by glibc
|
|
extern "C" int __register_atfork(void (*prepare)(void), void (*parent)(void),
|
|
void(*child)(void), void* dso) {
|
|
+ size_t page_size = getpagesize();
|
|
+
|
|
pthread_mutex_lock(&g_atfork_list_mutex);
|
|
|
|
+ for (atfork_t* page_it = page_list; page_it; page_it = page_it->next) {
|
|
+ mprotect(page_it, page_size, PROT_READ|PROT_WRITE);
|
|
+ }
|
|
+
|
|
if (!pool) {
|
|
- size_t page_size = getpagesize();
|
|
char* page = static_cast<char*>(mmap(NULL, page_size, PROT_READ|PROT_WRITE,
|
|
MAP_ANONYMOUS|MAP_PRIVATE, -1, 0));
|
|
if (page == MAP_FAILED) {
|
|
+ for (atfork_t* page_it = page_list; page_it; page_it = page_it->next) {
|
|
+ mprotect(page_it, page_size, PROT_READ);
|
|
+ }
|
|
+
|
|
pthread_mutex_unlock(&g_atfork_list_mutex);
|
|
return ENOMEM;
|
|
}
|
|
@@ -174,11 +184,15 @@ extern "C" int __register_atfork(void (*prepare)(void), void (*parent)(void),
|
|
prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, page, page_size,
|
|
"atfork handlers");
|
|
|
|
- for (char* it = page; it < page + page_size - sizeof(atfork_t); it += sizeof(atfork_t)) {
|
|
+ for (char* it = page + sizeof(atfork_t); it < page + page_size - sizeof(atfork_t); it += sizeof(atfork_t)) {
|
|
atfork_t* node = reinterpret_cast<atfork_t*>(it);
|
|
node->next = pool;
|
|
pool = node;
|
|
}
|
|
+
|
|
+ atfork_t* page_node = reinterpret_cast<atfork_t*>(page);
|
|
+ page_node->next = page_list;
|
|
+ page_list = page_node;
|
|
}
|
|
|
|
atfork_t* entry = pool;
|
|
@@ -191,6 +205,10 @@ extern "C" int __register_atfork(void (*prepare)(void), void (*parent)(void),
|
|
|
|
g_atfork_list.push_back(entry);
|
|
|
|
+ for (atfork_t* page_it = page_list; page_it; page_it = page_it->next) {
|
|
+ mprotect(page_it, page_size, PROT_READ);
|
|
+ }
|
|
+
|
|
pthread_mutex_unlock(&g_atfork_list_mutex);
|
|
|
|
return 0;
|
|
@@ -198,8 +216,20 @@ extern "C" int __register_atfork(void (*prepare)(void), void (*parent)(void),
|
|
|
|
extern "C" __LIBC_HIDDEN__ void __unregister_atfork(void* dso) {
|
|
pthread_mutex_lock(&g_atfork_list_mutex);
|
|
+
|
|
+ size_t page_size = getpagesize();
|
|
+
|
|
+ for (atfork_t* page_it = page_list; page_it; page_it = page_it->next) {
|
|
+ mprotect(page_it, page_size, PROT_READ|PROT_WRITE);
|
|
+ }
|
|
+
|
|
g_atfork_list.remove_if([&](const atfork_t* entry) {
|
|
return entry->dso_handle == dso;
|
|
});
|
|
+
|
|
+ for (atfork_t* page_it = page_list; page_it; page_it = page_it->next) {
|
|
+ mprotect(page_it, page_size, PROT_READ);
|
|
+ }
|
|
+
|
|
pthread_mutex_unlock(&g_atfork_list_mutex);
|
|
}
|