[Midnightbsd-cvs] [MidnightBSD/src] 0a1f96: OpenZFS: Ensure that zfs_getattr() initializes the...

[Mark Johnston]

  Branch: refs/heads/stable/3.1
  Home:   https://github.com/MidnightBSD/src
  Commit: 0a1f96bffd35f1925a270a28fad997ec2b18637a
      https://github.com/MidnightBSD/src/commit/0a1f96bffd35f1925a270a28fad997ec2b18637a
  Author: Mark Johnston <markjdb at gmail.com>
  Date:   2023-12-12 (Tue, 12 Dec 2023)

  Changed paths:
    M sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c

  Log Message:
  -----------
  OpenZFS: Ensure that zfs_getattr() initializes the va_rdev field

Otherwise the field is left uninitialized, leading to a possible kernel
memory disclosure to userspace or to the network.  Use the same
initialization value we use in zfsctl_common_getattr().

Reported-by: KMSAN
Sponsored-by: The FreeBSD Foundation
Reviewed-by: Brian Behlendorf <behlendorf1 at llnl.gov>
Reviewed-by: Ed Maste <emaste at FreeBSD.org>
Signed-off-by: Mark Johnston <markj at FreeBSD.org>

(cherry picked from commit 11656234b560c401dec6a16e1bf048b20fd31aac)
(cherry picked from commit af1e8b52d26502bac9a2484b87d1879334debd67)

Differential Revision:	https://reviews.freebsd.org/D42987