1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
From 88bb9f90ec1e4b43fb78596c8ff7577c92592eb4 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Fri, 25 Nov 2011 08:36:52 +0000
Subject: [PATCH 3/4] xulrunner: jemalloc aslr
---
memory/jemalloc/jemalloc.c | 33 ++++++++++++++++++++++-----------
1 files changed, 22 insertions(+), 11 deletions(-)
diff --git a/memory/jemalloc/jemalloc.c b/memory/jemalloc/jemalloc.c
index ad7c450..91de92c 100644
--- a/memory/mozjemalloc/jemalloc.c
+++ b/memory/mozjemalloc/jemalloc.c
@@ -410,7 +410,7 @@ void *_mmap(void *addr, size_t length, int prot, int flags,
static const bool __isthreaded = true;
#endif
-#if defined(MOZ_MEMORY_SOLARIS) && defined(MAP_ALIGN) && !defined(JEMALLOC_NEVER_USES_MAP_ALIGN)
+#if defined(MOZ_MEMORY_SOLARIS) || defined(MOZ_MEMORY_LINUX) || defined(MOZ_MEMORY_BSD)
#define JEMALLOC_USES_MAP_ALIGN /* Required on Solaris 10. Might improve performance elsewhere. */
#endif
@@ -2181,20 +2181,31 @@ pages_map_align(size_t size, int pfd, size_t alignment)
* We don't use MAP_FIXED here, because it can cause the *replacement*
* of existing mappings, and we only want to create new mappings.
*/
-#ifdef MALLOC_PAGEFILE
- if (pfd != -1) {
- ret = mmap((void *)alignment, size, PROT_READ | PROT_WRITE, MAP_PRIVATE |
- MAP_NOSYNC | MAP_ALIGN, pfd, 0);
- } else
-#endif
- {
- ret = mmap((void *)alignment, size, PROT_READ | PROT_WRITE, MAP_PRIVATE |
- MAP_NOSYNC | MAP_ALIGN | MAP_ANON, -1, 0);
- }
+ ret = mmap(NULL, size + alignment, PROT_READ | PROT_WRITE, MAP_PRIVATE |
+ MAP_NOSYNC| MAP_ANON, -1, 0);
assert(ret != NULL);
if (ret == MAP_FAILED)
ret = NULL;
+ else {
+ uintptr_t aligned_ret;
+ size_t extra_size;
+
+ aligned_ret = (uintptr_t)ret + alignment - 1;
+ aligned_ret &= ~(alignment - 1);
+ extra_size = aligned_ret - (uintptr_t)ret;
+ munmap(ret, extra_size);
+ munmap(ret + extra_size + size, alignment - extra_size);
+ ret = (void *)aligned_ret;
+#ifdef MALLOC_PAGEFILE
+ if (pfd != -1) {
+ ret = mmap(ret, size, PROT_READ | PROT_WRITE, MAP_PRIVATE |
+ MAP_NOSYNC | MAP_FIXED, pfd, 0);
+ }
+ if (ret == MAP_FAILED)
+ ret = NULL;
+#endif
+ }
return (ret);
}
#endif
--
1.7.7.4
|
