Prasanna Kumar Kalever 6497ef8df5 nbd: provide a way for userspace processes to identify device backends ... Problem: On reconfigure of device, there is no way to defend if the backend storage is matching with the initial backend storage. Say, if an initial connect request for backend "pool1/image1" got mapped to /dev/nbd0 and the userspace process is terminated. A next reconfigure request within NBD_ATTR_DEAD_CONN_TIMEOUT is allowed to use /dev/nbd0 for a different backend "pool1/image2" For example, an operation like below could be dangerous: $ sudo rbd-nbd map --try-netlink rbd-pool/ext4-image /dev/nbd0 $ sudo blkid /dev/nbd0 /dev/nbd0: UUID="bfc444b4-64b1-418f-8b36-6e0d170cfc04" TYPE="ext4" $ sudo pkill -9 rbd-nbd $ sudo rbd-nbd attach --try-netlink --device /dev/nbd0 rbd-pool/xfs-image /dev/nbd0 $ sudo blkid /dev/nbd0 /dev/nbd0: UUID="d29bf343-6570-4069-a9ea-2fa156ced908" TYPE="xfs" Solution: Provide a way for userspace processes to keep some metadata to identify between the device and the backend, so that when a reconfigure request is made, we can compare and avoid such dangerous operations. With this solution, as part of the initial connect request, backend path can be stored in the sysfs per device config, so that on a reconfigure request it's easy to check if the backend path matches with the initial connect backend path. Please note, ioctl interface to nbd will not have these changes, as there won't be any reconfigure. Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com> Reviewed-by: Xiubo Li <xiubli@redhat.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20210429102828.31248-1-prasanna.kalever@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>		2021-06-30 15:34:04 -06:00
..
android	binder: tell userspace to dump current backtrace when detected oneway spamming	2021-04-10 10:52:04 +02:00
byteorder
caif
can
cifs
dvb	media: dvb header files: move some headers to staging	2021-06-04 08:07:30 +02:00
genwqe
hdlc
hsi
iio	iio: buffer: add ioctl() to support opening extra buffers for IIO device	2021-03-11 20:47:05 +00:00
isdn
misc	bcm-vk: add bcm_vk UAPI	2021-01-25 18:44:44 +01:00
mmc
netfilter	netfilter: xt_SECMARK: add new revision to fix structure layout	2021-05-03 23:02:44 +02:00
netfilter_arp
netfilter_bridge
netfilter_ipv4
netfilter_ipv6
nfsd	UAPI: nfsfh.h: Replace one-element array with flexible-array member	2021-03-31 15:59:14 -04:00
raid
sched
spi	spi: Add SPI_NO_TX/RX support	2020-12-28 14:21:31 +00:00
sunrpc
surface_aggregator	platform/surface: aggregator_cdev: Allow enabling of events from user-space	2021-06-16 17:47:53 +02:00
tc_act
tc_ematch
usb	usb: webcam: Invalid size of Processing Unit Descriptor	2021-03-18 09:02:27 +01:00
a.out.h
acct.h
acrn.h	virt: acrn: Introduce irqfd	2021-02-09 10:58:19 +01:00
adb.h
adfs_fs.h
affs_hardblocks.h
agpgart.h
aio_abi.h
am437x-vpfe.h
apm_bios.h
arcfb.h
arm_sdei.h
aspeed-lpc-ctrl.h
aspeed-p2a-ctrl.h
atalk.h
atm.h
atm_eni.h
atm_he.h
atm_idt77105.h
atm_nicstar.h
atm_tcp.h
atm_zatm.h
atmapi.h
atmarp.h
atmbr2684.h
atmclip.h
atmdev.h
atmioc.h
atmlec.h
atmmpc.h
atmppp.h
atmsap.h
atmsvc.h
audit.h
auto_dev-ioctl.h
auto_fs.h
auto_fs4.h
auxvec.h
ax25.h
batadv_packet.h	batman-adv: Drop publication years from copyright info	2021-02-06 09:22:10 +01:00
batman_adv.h	batman-adv: Drop publication years from copyright info	2021-02-06 09:22:10 +01:00
baycom.h
bcache.h	bcache: introduce BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE for large bucket	2021-01-09 09:21:03 -07:00
bcm933xx_hcs.h
bfs_fs.h
binfmts.h	binfmt_misc: pass binfmt_misc flags to the interpreter	2021-02-15 18:28:30 +01:00
blkpg.h	block: update a few comments in uapi/linux/blkpg.h	2021-04-02 11:18:30 -06:00
blktrace_api.h
blkzoned.h
bpf.h	bpf: Add a bpf_snprintf helper	2021-04-19 15:27:36 -07:00
bpf_common.h
bpf_perf_event.h
bpfilter.h
bpqether.h
bsg.h
bt-bmc.h
btf.h	bpf: Add BTF_KIND_FLOAT to uapi	2021-03-04 17:58:15 -08:00
btrfs.h	btrfs: fix typos in comments	2021-06-22 14:11:57 +02:00
btrfs_tree.h	btrfs: fix typos in comments	2021-06-22 14:11:57 +02:00
can.h	can: uapi: can.h: mark union inside struct can_frame packed	2021-03-29 09:51:49 +02:00
capability.h	capabilities: require CAP_SETFCAP to map uid 0	2021-04-20 14:28:33 -07:00
capi.h
cciss_defs.h
cciss_ioctl.h
ccs.h	media: v4l: uapi: ccs: Add CCS controls for shading correction	2021-01-12 17:31:14 +01:00
cdrom.h
cec-funcs.h	media: uapi/linux/cec-funcs.h: set delay to 1 if unnused	2021-06-02 14:08:09 +02:00
cec.h	media: core headers: fix kernel-doc warnings	2021-03-22 10:22:22 +01:00
cfm_bridge.h
cgroupstats.h
chio.h
close_range.h
cm4000_cs.h
cn_proc.h
coda.h
coff.h
connector.h
const.h	uapi: move constants from <linux/kernel.h> to <linux/const.h>	2020-12-15 12:13:36 -08:00
coresight-stm.h
cramfs_fs.h
cryptouser.h
cuda.h
cxl_mem.h	cxl/mem: Add set of informational commands	2021-02-16 20:36:39 -08:00
cycx_cfm.h
dcbnl.h
dccp.h
devlink.h	devlink: Support get and set state of port function	2021-01-22 11:32:08 -08:00
dlm.h
dlm_device.h
dlm_netlink.h
dlm_plock.h
dlmconstants.h
dm-ioctl.h	dm ioctl: return UUID in DM_LIST_DEVICES_CMD result	2021-03-26 14:53:41 -04:00
dm-log-userspace.h
dma-buf.h
dma-heap.h
dn.h
dns_resolver.h
dqblk_xfs.h	quota: report warning limits for realtime space quotas	2021-03-18 17:03:54 +01:00
edd.h
efs_fs_sb.h
elf-em.h
elf-fdpic.h
elf.h	arm64: Introduce prctl(PR_PAC_{SET,GET}_ENABLED_KEYS)	2021-04-13 17:31:44 +01:00
errno.h
errqueue.h
erspan.h
ethtool.h	ethtool: add interface to read RMON stats	2021-04-16 16:59:20 -07:00
ethtool_netlink.h	ethtool: add interface to read RMON stats	2021-04-16 16:59:20 -07:00
eventpoll.h
f2fs.h
fadvise.h
falloc.h
fanotify.h
fb.h
fcntl.h
fd.h	floppy: cleanups: remove trailing whitespaces	2021-04-20 08:59:03 -06:00
fdreg.h
fib_rules.h
fiemap.h
filter.h
firewire-cdev.h	include/linux: remove repeated words	2021-02-26 09:41:03 -08:00
firewire-constants.h
fou.h
fpga-dfl.h
fs.h	block: uapi: fix comment about block device ioctl	2021-05-10 09:26:18 -06:00
fscrypt.h
fsi.h
fsl_hypervisor.h
fsl_mc.h	bus: fsl-mc: add fsl-mc userspace support	2021-01-27 15:13:52 +01:00
fsmap.h
fsverity.h	fs-verity: support reading signature with ioctl	2021-02-07 14:51:19 -08:00
fuse.h	fuse: add a flag FUSE_SETXATTR_ACL_KILL_SGID to kill SGID	2021-04-14 10:40:57 +02:00
futex.h	futex: Provide FUTEX_LOCK_PI2 to support clock selection	2021-06-22 16:42:09 +02:00
gameport.h
gen_stats.h
genetlink.h
gfs2_ondisk.h	gfs2: Add trusted xattr support	2021-02-08 13:01:24 +01:00
gpio.h	gpio: uapi: use the preferred SPDX license identifier	2021-02-15 11:43:33 +01:00
gsmmux.h
gtp.h	Revert "GTP: add support for flow based tunneling API"	2021-02-04 09:29:57 -08:00
hash_info.h
hdlc.h
hdlcdrv.h
hdreg.h
hid.h
hiddev.h
hidraw.h
hpet.h
hsr_netlink.h
hw_breakpoint.h
hyperv.h
i2c-dev.h	i2c: remove licence boilerplate from i2c-dev UAPI header	2021-01-22 09:58:57 +01:00
i2c.h	i2c: uapi: add macro to describe support for all SMBus transfers	2021-01-22 09:59:00 +01:00
i2o-dev.h
i8k.h
icmp.h	icmp: standardize naming of RFC 8335 PROBE constants	2021-04-28 13:42:23 -07:00
icmpv6.h	ICMPV6: add support for RFC 8335 PROBE	2021-03-30 13:29:39 -07:00
idxd.h	dmaengine: idxd: fix delta_rec and crc size field for completion record	2021-04-12 13:26:03 +05:30
if.h
if_addr.h
if_addrlabel.h
if_alg.h
if_arcnet.h
if_arp.h
if_bonding.h	treewide: remove editor modelines and cruft	2021-05-07 00:26:34 -07:00
if_bridge.h
if_cablemodem.h
if_eql.h
if_ether.h
if_fc.h
if_fddi.h	FDDI: if_fddi.h: Update my e-mail address	2021-03-10 12:45:16 -08:00
if_hippi.h
if_infiniband.h
if_link.h	macvlan: Add nodst option to macvlan type source	2021-04-25 18:35:01 -07:00
if_ltalk.h
if_macsec.h
if_packet.h
if_phonet.h
if_plip.h
if_ppp.h
if_pppol2tp.h
if_pppox.h
if_slip.h
if_team.h
if_tun.h
if_tunnel.h	Revert "GTP: add support for flow based tunneling API"	2021-02-04 09:29:57 -08:00
if_vlan.h
if_x25.h
if_xdp.h
ife.h
igmp.h
ila.h
in.h	icmp: don't send out ICMP messages with a source address of 0.0.0.0	2021-06-18 12:13:24 -07:00
in6.h
in_route.h
inet_diag.h
inotify.h
input-event-codes.h	HID: hid-input: add mapping for emoji picker key	2021-05-05 14:31:05 +02:00
input.h	include/linux: remove repeated words	2021-02-26 09:41:03 -08:00
io_uring.h	io_uring: add feature flag for rsrc tags	2021-06-10 16:33:51 -06:00
ioctl.h
iommu.h	iommu/vt-d: Enable write protect propagation from guest	2021-03-18 11:42:46 +01:00
ip.h
ip6_tunnel.h
ip_vs.h
ipc.h
ipmi.h
ipmi_bmc.h
ipmi_msgdefs.h
ipsec.h
ipv6.h	net: allow user to set metric on default route learned via Router Advertisement	2021-01-26 18:39:45 -08:00
ipv6_route.h
ipx.h
irqnr.h
iso_fs.h
isst_if.h
ivtv.h
ivtvfb.h
jffs2.h
joystick.h
kcm.h
kcmp.h
kcov.h
kd.h
kdev_t.h
kernel-page-flags.h
kernel.h	uapi: move constants from <linux/kernel.h> to <linux/const.h>	2020-12-15 12:13:36 -08:00
kernelcapi.h
kexec.h	RISC-V: Add EM_RISCV to kexec UAPI header	2021-04-26 08:25:20 -07:00
keyboard.h
keyctl.h
kfd_ioctl.h	drm/amdkfd: Bump KFD API version	2021-03-23 23:40:55 -04:00
kvm.h	KVM/arm64 updates for v5.14.	2021-06-25 11:24:24 -04:00
kvm_para.h	KVM: X86: Introduce KVM_HC_MAP_GPA_RANGE hypercall	2021-06-17 14:25:39 -04:00
l2tp.h	net: l2tp: reduce log level of messages in receive path, add counter instead	2021-03-03 16:55:02 -08:00
landlock.h	landlock: Enable user space to infer supported features	2021-04-22 12:22:11 -07:00
libc-compat.h
lightnvm.h	lightnvm: remove duplicate include in lightnvm.h	2021-04-13 09:16:12 -06:00
limits.h
lirc.h	media: lirc: remove out of date comment	2021-05-21 15:03:50 +02:00
llc.h
loop.h
lp.h
lwtunnel.h
magic.h
major.h	tty: cyclades, remove this orphan	2021-03-10 09:34:06 +01:00
map_to_7segment.h	uapi: map_to_7segment: Remove licence boilerplate	2021-03-24 08:26:29 +01:00
matroxfb.h
max2175.h
mdio.h	net: phy: add constants for 2.5G and 5G speed in PCS speed register	2021-04-08 13:15:33 -07:00
media-bus-format.h
media.h	media: uapi: Add an entity type for Image Signal Processors	2021-01-12 17:05:37 +01:00
mei.h
membarrier.h
memfd.h
mempolicy.h	mm/vmscan: move RECLAIM* bits to uapi header	2021-05-05 11:27:23 -07:00
meye.h
mii.h
minix_fs.h
mman.h
mmtimer.h
module.h
mount.h	mount: Support "nosymfollow" in new mount api	2021-06-01 12:09:27 +02:00
mpls.h
mpls_iptunnel.h
mptcp.h	mptcp: add mptcp reset option support	2021-04-02 14:21:50 -07:00
mqueue.h
mroute.h
mroute6.h	uapi: move constants from <linux/kernel.h> to <linux/const.h>	2020-12-15 12:13:36 -08:00
mrp_bridge.h	net: mrp: move struct definitions out of uapi	2021-01-23 12:38:42 -08:00
msdos_fs.h
msg.h
mtio.h
n_r3964.h
nbd-netlink.h	nbd: provide a way for userspace processes to identify device backends	2021-06-30 15:34:04 -06:00
nbd.h
ncsi.h
ndctl.h
neighbour.h
net.h
net_dropmon.h
net_namespace.h
net_tstamp.h
netconf.h
netdevice.h
netfilter.h
netfilter_arp.h
netfilter_bridge.h
netfilter_decnet.h
netfilter_ipv4.h
netfilter_ipv6.h
netlink.h	uapi: move constants from <linux/kernel.h> to <linux/const.h>	2020-12-15 12:13:36 -08:00
netlink_diag.h
netrom.h
nexthop.h	nexthop: Add netlink defines and enumerators for resilient NH groups	2021-03-11 16:12:59 -08:00
nfc.h
nfs.h
nfs2.h
nfs3.h	NFSD: Update the SETATTR3args decoder to use struct xdr_stream	2021-01-25 09:36:25 -05:00
nfs4.h	treewide: remove editor modelines and cruft	2021-05-07 00:26:34 -07:00
nfs4_mount.h
nfs_fs.h
nfs_idmap.h
nfs_mount.h
nfsacl.h
nilfs2_api.h
nilfs2_ondisk.h
nitro_enclaves.h
nl80211.h	nl80211: Add new RSNXE related nl80211 extended features	2021-04-19 12:04:37 +02:00
nsfs.h
nubus.h
nvme_ioctl.h
nvram.h
omap3isp.h
omapfb.h
oom.h
openat2.h	fs: expose LOOKUP_CACHED through openat2() RESOLVE_CACHED	2021-01-04 11:42:26 -05:00
openvswitch.h
packet_diag.h
param.h
parport.h
patchkey.h
pci.h
pci_regs.h	pci-v5.11-changes	2020-12-15 16:49:59 -08:00
pcitest.h
perf_event.h	Merge branch 'for-v5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-05-21 06:12:52 -10:00
personality.h
pfkeyv2.h
pg.h
phantom.h
phonet.h
pidfd.h
pkt_cls.h	net/sched: act_police: add support for packet-per-second policing	2021-03-13 14:18:09 -08:00
pkt_sched.h	sch_htb: Hierarchical QoS hardware offload	2021-01-22 20:41:29 -08:00
pktcdvd.h
pmu.h
poll.h
posix_acl.h
posix_acl_xattr.h
posix_types.h
ppdev.h
ppp-comp.h
ppp-ioctl.h	ppp: Fix PPPIOCUNBRIDGECHAN request number	2020-12-21 17:36:48 -08:00
ppp_defs.h
pps.h
pr.h
prctl.h	sched: prctl() core-scheduling interface	2021-05-12 11:43:31 +02:00
psample.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-03-25 15:31:22 -07:00
psci.h
psp-sev.h
ptp_clock.h
ptrace.h	rseq, ptrace: Add PTRACE_GET_RSEQ_CONFIGURATION request	2021-03-17 16:15:39 +01:00
qemu_fw_cfg.h
qnx4_fs.h
qnxtypes.h
qrtr.h
quota.h
radeonfb.h
random.h
raw.h
rds.h
reboot.h
reiserfs_fs.h
reiserfs_xattr.h
remoteproc_cdev.h
resource.h
rfkill.h	rfkill: revert back to old userspace API by default	2021-04-08 10:14:45 +02:00
rio_cm_cdev.h
rio_mport_cdev.h
rkisp1-config.h	media: rkisp1: uapi: document which flags/structs relate to statistics config	2021-04-06 10:29:56 +02:00
romfs_fs.h
rose.h
route.h
rpl.h	uapi: fix big endian definition of ipv6_rpl_sr_hdr	2021-01-25 15:14:16 -08:00
rpl_iptunnel.h
rpmsg.h	rpmsg: Add short description of the IOCTL defined in UAPI.	2021-03-17 14:16:26 -05:00
rpmsg_types.h
rseq.h
rtc.h	rtc: introduce features bitfield	2021-01-16 23:19:26 +01:00
rtnetlink.h	Add Open Routing Protocol ID to rtnetlink.h	2021-03-24 16:31:23 -07:00
rxrpc.h
scc.h
sched.h
scif_ioctl.h
screen_info.h
sctp.h
seccomp.h	seccomp: Support atomic "addfd + send reply"	2021-06-28 12:49:52 -07:00
securebits.h
sed-opal.h
seg6.h
seg6_genl.h
seg6_hmac.h
seg6_iptunnel.h
seg6_local.h	seg6: add counters support for SRv6 Behaviors	2021-04-29 15:26:57 -07:00
selinux_netlink.h
sem.h
serial.h	tty: cyclades, remove this orphan	2021-03-10 09:34:06 +01:00
serial_core.h	tty: serial: Drop unused efm32 serial driver	2021-01-15 17:14:49 +01:00
serial_reg.h
serio.h
shm.h
signal.h
signalfd.h	signalfd: Remove SIL_PERF_EVENT fields from signalfd_siginfo	2021-05-18 16:20:54 -05:00
smc.h
smc_diag.h
smiapp.h
snmp.h
sock_diag.h
socket.h
sockios.h
sonet.h
sonypi.h
sound.h
soundcard.h
stat.h
stddef.h
stm.h
string.h
suspend_ioctls.h
swab.h
switchtec_ioctl.h
sync_file.h
synclink.h
sysctl.h	net: allow user to set metric on default route learned via Router Advertisement	2021-01-26 18:39:45 -08:00
sysinfo.h
target_core_user.h
taskstats.h
tcp.h	tcp: Sanitize CMSG flags and reserved args in tcp_zerocopy_receive.	2021-02-11 18:25:05 -08:00
tcp_metrics.h
tee.h	tee: fix some comment typos in header files	2021-02-02 14:50:15 +01:00
termios.h	tty: drop termiox user definitions	2021-01-07 16:17:32 +01:00
thermal.h	thermal: Fix spelling mistake "disabed" -> "disabled"	2021-03-11 12:13:08 +01:00
time.h
time_types.h
timerfd.h
times.h
timex.h
tiocl.h
tipc.h
tipc_config.h
tipc_netlink.h
tipc_sockets_diag.h
tls.h
toshiba.h
tty.h
tty_flags.h	tty: add ASYNC_SPLIT_TERMIOS to deprecation mask	2021-04-10 10:36:34 +02:00
types.h
udf_fs_i.h
udmabuf.h
udp.h
uhid.h
uinput.h
uio.h
uleds.h
ultrasound.h
um_timetravel.h
un.h
unistd.h
unix_diag.h
usbdevice_fs.h
usbip.h
userfaultfd.h	userfaultfd: uapi: fix UFFDIO_CONTINUE ioctl request definition	2021-06-25 10:53:26 -07:00
userio.h
utime.h
utsname.h
uuid.h
uvcvideo.h	media: vpbe_osd.h/uvcvideo.h includes: fix trivial kernel-doc warnings	2021-03-22 10:24:07 +01:00
v4l2-common.h
v4l2-controls.h	media: vicodec: Use _BITUL() macro in UAPI headers	2021-06-02 14:09:05 +02:00
v4l2-dv-timings.h
v4l2-mediabus.h
v4l2-subdev.h	media: core headers: fix kernel-doc warnings	2021-03-22 10:22:22 +01:00
vbox_err.h
vbox_vmmdev_types.h
vboxguest.h
vdpa.h	vdpa: Enable user to query vdpa device info	2021-02-23 07:52:56 -05:00
veth.h
vfio.h	vfio/pci: Revert nvlink removal uAPI breakage	2021-05-05 10:19:41 -06:00
vfio_ccw.h
vfio_zdev.h
vhost.h
vhost_types.h
videodev2.h	media: uapi: move MPEG-2 stateless controls out of staging	2021-05-23 19:21:31 +02:00
virtio_9p.h
virtio_balloon.h
virtio_blk.h
virtio_bt.h	Bluetooth: Add support for virtio transport driver	2021-04-08 12:26:34 +02:00
virtio_config.h
virtio_console.h
virtio_crypto.h
virtio_fs.h
virtio_gpu.h
virtio_ids.h	Bluetooth: Fix VIRTIO_ID_BT assigned number	2021-06-03 14:01:55 -07:00
virtio_input.h
virtio_iommu.h
virtio_mem.h
virtio_mmio.h
virtio_net.h
virtio_pci.h
virtio_pmem.h
virtio_ring.h
virtio_rng.h
virtio_scsi.h
virtio_snd.h	ALSA: virtio: add virtio sound driver	2021-03-07 09:07:16 +01:00
virtio_types.h
virtio_vsock.h
vm_sockets.h	vm_sockets: Add VMADDR_FLAG_TO_HOST vsock flag	2020-12-14 19:33:39 -08:00
vm_sockets_diag.h
vmcore.h
vsockmon.h
vt.h
vtpm_proxy.h
wait.h
watch_queue.h
watchdog.h
wireguard.h
wireless.h
wmi.h
x25.h
xattr.h
xdp_diag.h
xfrm.h
xilinx-v4l2-controls.h
zorro.h
zorro_ids.h