From 88bb9f90ec1e4b43fb78596c8ff7577c92592eb4 Mon Sep 17 00:00:00 2001 From: Natanael Copa 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/jemalloc/jemalloc.c +++ b/memory/jemalloc/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