Module Name: src
Committed By: hannken
Date: Fri Dec 9 10:33:18 UTC 2022
Modified Files:
src/sys/kern: vfs_mount.c
src/sys/miscfs/genfs: layer_vfsops.c
Log Message:
Harden layered file systems usage of field "mnt_lower" against
forced unmounts of the lower layer.
- Dont allow "dead_rootmount" as lower layer.
- Take file system busy before a vfs operation walks down the stack.
Reported-by: syzbot+27b35e5675b1753ce...@syzkaller.appspotmail.com
Reported-by: syzbot+99071492e3de2eff4...@syzkaller.appspotmail.com
To generate a diff of this commit:
cvs rdiff -u -r1.100 -r1.101 src/sys/kern/vfs_mount.c
cvs rdiff -u -r1.55 -r1.56 src/sys/miscfs/genfs/layer_vfsops.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
