From 58017e655399384afed2cedea0e269cb1ad2dd7e Mon Sep 17 00:00:00 2001 From: Ayush Ranjan Date: Mon, 1 Nov 2021 16:48:16 -0700 Subject: Handle UMOUNT_NOFOLLOW in VFS2 umount(2). Reported-by: syzbot+f9ecb181a4b3abdde9b9@syzkaller.appspotmail.com Reported-by: syzbot+8c5cb9d7a044a91a513b@syzkaller.appspotmail.com PiperOrigin-RevId: 406951359 --- pkg/sentry/syscalls/linux/vfs2/mount.go | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'pkg') diff --git a/pkg/sentry/syscalls/linux/vfs2/mount.go b/pkg/sentry/syscalls/linux/vfs2/mount.go index 4d73d46ef..fd0ab4c76 100644 --- a/pkg/sentry/syscalls/linux/vfs2/mount.go +++ b/pkg/sentry/syscalls/linux/vfs2/mount.go @@ -136,14 +136,14 @@ func Umount2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysca if err != nil { return 0, nil, err } - tpop, err := getTaskPathOperation(t, linux.AT_FDCWD, path, disallowEmptyPath, nofollowFinalSymlink) + tpop, err := getTaskPathOperation(t, linux.AT_FDCWD, path, disallowEmptyPath, shouldFollowFinalSymlink(flags&linux.UMOUNT_NOFOLLOW == 0)) if err != nil { return 0, nil, err } defer tpop.Release(t) opts := vfs.UmountOptions{ - Flags: uint32(flags), + Flags: uint32(flags &^ linux.UMOUNT_NOFOLLOW), } return 0, nil, t.Kernel().VFS().UmountAt(t, creds, &tpop.pop, &opts) -- cgit v1.2.3