Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

If built with DEBUG Limit the depth of file system stack so kernel sanitizers 

may stress mount/unmount without exhausting the kernel stack.
This commit is contained in:
hannken 2022-11-10 10:55:00 +00:00
parent aac0938bfe
commit 3652e3db73
1 changed files with 16 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
sys/kern/vfs_mount.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vfs_mount.c,v 1.99 2022/11/04 11:20:39 hannken Exp $ */
/* $NetBSD: vfs_mount.c,v 1.100 2022/11/10 10:55:00 hannken Exp $ */
/*-
* Copyright (c) 1997-2020 The NetBSD Foundation, Inc.
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_mount.c,v 1.99 2022/11/04 11:20:39 hannken Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_mount.c,v 1.100 2022/11/10 10:55:00 hannken Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@ -403,6 +403,20 @@ vfs_set_lowermount(struct mount *mp, struct mount *lowermp)
struct mount *oldlowermp;
int error;
#ifdef DEBUG
/*
* Limit the depth of file system stack so kernel sanitizers
* may stress mount/unmount without exhausting the kernel stack.
*/
int depth;
struct mount *mp2;
for (depth = 0, mp2 = lowermp; mp2; depth++, mp2 = mp2->mnt_lower) {
if (depth == 23)
return EINVAL;
}
#endif
if (lowermp) {
error = vfs_busy(lowermp);
if (error)