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From f9ecb6bfa1dc9f93a10dad97a158e6b8334c586c Mon Sep 17 00:00:00 2001
From: Daniel Micay <danielmicay@gmail.com>
Date: Sat, 31 Oct 2015 05:14:45 -0400
Subject: [PATCH] prevent allocs than PTRDIFF_MAX via mremap
It's quite feasible for this to happen via MREMAP_MAYMOVE.
---
src/mman/mremap.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/mman/mremap.c b/src/mman/mremap.c
index 596c45f..1096ace 100644
--- a/src/mman/mremap.c
+++ b/src/mman/mremap.c
@@ -1,5 +1,7 @@
#include <unistd.h>
#include <sys/mman.h>
+#include <errno.h>
+#include <stdint.h>
#include <stdarg.h>
#include "syscall.h"
#include "libc.h"
@@ -8,7 +10,12 @@ void *__mremap(void *old_addr, size_t old_len, size_t new_len, int flags, ...)
{
va_list ap;
void *new_addr;
-
+
+ if (new_len >= PTRDIFF_MAX) {
+ errno = ENOMEM;
+ return MAP_FAILED;
+ }
+
va_start(ap, flags);
new_addr = va_arg(ap, void *);
va_end(ap);
--
2.7.0
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