sys_mmap(): correct initial address check

2016-08-18 07:32:31 +09:00
parent 5fd68eae54
commit bd6a2c2311
1 changed files with 2 additions and 3 deletions
--- a/arch/x86/kernel/syscall.c
+++ b/arch/x86/kernel/syscall.c
@ -1434,9 +1434,8 @@ SYSCALL_DECLARE(mmap)
 		goto out;
 	}

-	if ((addr < region->user_start)
-			|| (region->user_end <= addr)
-			|| ((region->user_end - addr) < len)) {
+	if ((flags & MAP_FIXED) && ((addr < region->user_start)
+			|| (region->user_end <= addr))) {
 		ekprintf("sys_mmap(%lx,%lx,%x,%x,%x,%lx):ENOMEM\n",
 				addr0, len0, prot, flags0, fd, off0);
 		error = -ENOMEM;