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-rw-r--r--src/mman/mmap.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/src/mman/mmap.c b/src/mman/mmap.c
index fd2bb07e..e99271f7 100644
--- a/src/mman/mmap.c
+++ b/src/mman/mmap.c
@@ -10,12 +10,16 @@ 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 (flags & MAP_FIXED) __vm_lock(-1);
#ifdef SYS_mmap2
ret = (void *)syscall(SYS_mmap2, start, len, prot, flags, fd, off>>12);