X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fmman%2Fmmap.c;h=b56cff86b6da4b9265b3a1350fb4ea54c0f46015;hp=fd2bb07e5d5fb53f180bf21e04145914d20e1aa1;hb=3cd6f5229f079f892411e82fce3fe15c78eef4d8;hpb=60164570111873175111cf8a5b973375e492eee9

diff --git a/src/mman/mmap.c b/src/mman/mmap.c
index fd2bb07e..b56cff86 100644
--- a/src/mman/mmap.c
+++ b/src/mman/mmap.c
@@ -1,6 +1,7 @@
 #include <unistd.h>
 #include <sys/mman.h>
 #include <errno.h>
+#include <stdint.h>
 #include <limits.h>
 #include "syscall.h"
 #include "libc.h"
@@ -10,12 +11,20 @@ static void dummy0(void) { }
 weak_alias(dummy1, __vm_lock);
 weak_alias(dummy0, __vm_unlock);
 
+#define OFF_MASK ((-0x2000ULL << (8*sizeof(long)-1)) | 0xfff)
+
 void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
 {
 	void *ret;
-	if (sizeof(off_t) > sizeof(long))
-		if (((long)off & 0xfff) | ((long)((unsigned long long)off>>(12 + 8*(sizeof(off_t)-sizeof(long))))))
-			start = (void *)-1;
+
+	if (off & OFF_MASK) {
+		errno = EINVAL;
+		return MAP_FAILED;
+	}
+	if (len >= PTRDIFF_MAX) {
+		errno = ENOMEM;
+		return MAP_FAILED;
+	}
 	if (flags & MAP_FIXED) __vm_lock(-1);
 #ifdef SYS_mmap2
 	ret = (void *)syscall(SYS_mmap2, start, len, prot, flags, fd, off>>12);