diff options
| -rw-r--r-- | src/mman/mmap.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/src/mman/mmap.c b/src/mman/mmap.c index fd2bb07..e99271f 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); |