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xemu/tools/virtiofsd
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Stefan Hajnoczi c241aa9457 virtiofsd: introduce inode refcount to prevent use-after-free 
If thread A is using an inode it must not be deleted by thread B when
processing a FUSE_FORGET request.

The FUSE protocol itself already has a counter called nlookup that is
used in FUSE_FORGET messages.  We cannot trust this counter since the
untrusted client can manipulate it via FUSE_FORGET messages.

Introduce a new refcount to keep inodes alive for the required lifespan.
lo_inode_put() must be called to release a reference.  FUSE's nlookup
counter holds exactly one reference so that the inode stays alive as
long as the client still wants to remember it.

Note that the lo_inode->is_symlink field is moved to avoid creating a
hole in the struct due to struct field alignment.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23 16:41:37 +00:00
..
50-qemu-virtiofsd.json.in
virtiofsd: add vhost-user.json file
2020-01-23 16:41:36 +00:00
buffer.c
virtiofsd: add fuse_mbuf_iter API
2020-01-23 16:41:36 +00:00
fuse_common.h
virtiofsd: Parse flag FUSE_WRITE_KILL_PRIV
2020-01-23 16:41:37 +00:00
fuse_i.h
virtiofsd: Plumb fuse_bufvec through to do_write_buf
2020-01-23 16:41:36 +00:00
fuse_log.c
virtiofsd: Fix common header and define for QEMU builds
2020-01-23 16:41:36 +00:00
fuse_log.h
virtiofsd: Format imported files to qemu style
2020-01-23 16:41:36 +00:00
fuse_lowlevel.c
virtiofsd: use fuse_lowlevel_is_virtio() in fuse_session_destroy()
2020-01-23 16:41:37 +00:00
fuse_lowlevel.h
virtiofsd: print log only when priority is high enough
2020-01-23 16:41:37 +00:00
fuse_misc.h
virtiofsd: support nanosecond resolution for file timestamp
2020-01-23 16:41:37 +00:00
fuse_opt.c
virtiofsd: Fix common header and define for QEMU builds
2020-01-23 16:41:36 +00:00
fuse_opt.h
virtiofsd: Format imported files to qemu style
2020-01-23 16:41:36 +00:00
fuse_signals.c
virtiofsd: Fix common header and define for QEMU builds
2020-01-23 16:41:36 +00:00
fuse_virtio.c
virtiofsd: prevent fv_queue_thread() vs virtio_loop() races
2020-01-23 16:41:37 +00:00
fuse_virtio.h
virtiofsd: cleanup allocated resource in se
2020-01-23 16:41:37 +00:00
fuse.h
virtiofsd: Format imported files to qemu style
2020-01-23 16:41:36 +00:00
helper.c
virtiofsd: Support remote posix locks
2020-01-23 16:41:37 +00:00
Makefile.objs
virtiofsd: add seccomp whitelist
2020-01-23 16:41:37 +00:00
passthrough_helpers.h
virtiofsd: Format imported files to qemu style
2020-01-23 16:41:36 +00:00
passthrough_ll.c
virtiofsd: introduce inode refcount to prevent use-after-free
2020-01-23 16:41:37 +00:00
seccomp.c
virtiofsd: add --syslog command-line option
2020-01-23 16:41:37 +00:00
seccomp.h
virtiofsd: add --syslog command-line option
2020-01-23 16:41:37 +00:00