K 10
svn:author
V 7
asomers
K 8
svn:date
V 27
2022-08-20T02:57:37.225958Z
K 7
svn:log
V 1025
fusefs: make the mknod.cc tests a bit more general.

Reviewed by:    pfg

(cherry picked from commit 8b582b16402102df10a715c626e212bbbc8e9d7c)

fusefs: handle evil servers that return illegal inode numbers

* If during FUSE_CREATE, FUSE_MKDIR, etc the server returns the same
  inode number for the new file as for its parent directory, reject it.
  Previously this would triggers a recurse-on-non-recursive lock panic.

* If during FUSE_LINK the server returns a different inode number for
  the new name as for the old one, reject it.  Obviously, that can't be
  a hard link.

* If during FUSE_LOOKUP the server returns the same inode number for the
  new file as for its parent directory, reject it.  Nothing good can
  come of this.

PR:		263662
Reported by:	Robert Morris <rtm@lcs.mit.edu>
Reviewed by:	pfg
Differential Revision: https://reviews.freebsd.org/D35128

(cherry picked from commit 0bef4927ea858bb18b6f679bc0a36cff264dc842)

Git Hash:   93891ed2f794ba871f8cae5cc5fc04abced2d157
Git Author: asomers@FreeBSD.org
END