From 26ea18173c1228dd5ce39e2a88ffe1ae10fcb365 Mon Sep 17 00:00:00 2001 From: notaz Date: Wed, 25 Mar 2015 00:38:13 +0200 Subject: [PATCH] plat: avoid MAP_FIXED --- linux/plat.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/linux/plat.c b/linux/plat.c index 660a095..06c315e 100644 --- a/linux/plat.c +++ b/linux/plat.c @@ -178,8 +178,10 @@ void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed) req = (void *)addr; if (need_exec) prot |= PROT_EXEC; + /* avoid MAP_FIXED, it overrides existing mappings.. if (is_fixed) flags |= MAP_FIXED; + */ if (size >= HUGETLB_THRESHOLD) flags |= MAP_HUGETLB; @@ -197,9 +199,14 @@ void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed) if (ret == MAP_FAILED) return NULL; - if (req != NULL && ret != req) - fprintf(stderr, - "warning: mmaped to %p, requested %p\n", ret, req); + if (req != NULL && ret != req) { + fprintf(stderr, "%s: mmaped to %p, requested %p\n", + is_fixed ? "error" : "warning", ret, req); + if (is_fixed) { + munmap(ret, size); + return NULL; + } + } return ret; } -- 2.39.2