Kumar Kartikeya Dwivedi c0a5a21c25 bpf: Allow storing referenced kptr in map ... Extending the code in previous commits, introduce referenced kptr support, which needs to be tagged using 'kptr_ref' tag instead. Unlike unreferenced kptr, referenced kptr have a lot more restrictions. In addition to the type matching, only a newly introduced bpf_kptr_xchg helper is allowed to modify the map value at that offset. This transfers the referenced pointer being stored into the map, releasing the references state for the program, and returning the old value and creating new reference state for the returned pointer. Similar to unreferenced pointer case, return value for this case will also be PTR_TO_BTF_ID_OR_NULL. The reference for the returned pointer must either be eventually released by calling the corresponding release function, otherwise it must be transferred into another map. It is also allowed to call bpf_kptr_xchg with a NULL pointer, to clear the value, and obtain the old value if any. BPF_LDX, BPF_STX, and BPF_ST cannot access referenced kptr. A future commit will permit using BPF_LDX for such pointers, but attempt at making it safe, since the lifetime of object won't be guaranteed. There are valid reasons to enforce the restriction of permitting only bpf_kptr_xchg to operate on referenced kptr. The pointer value must be consistent in face of concurrent modification, and any prior values contained in the map must also be released before a new one is moved into the map. To ensure proper transfer of this ownership, bpf_kptr_xchg returns the old value, which the verifier would require the user to either free or move into another map, and releases the reference held for the pointer being moved in. In the future, direct BPF_XCHG instruction may also be permitted to work like bpf_kptr_xchg helper. Note that process_kptr_func doesn't have to call check_helper_mem_access, since we already disallow rdonly/wronly flags for map, which is what check_map_access_type checks, and we already ensure the PTR_TO_MAP_VALUE refers to kptr by obtaining its off_desc, so check_map_access is also not required. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20220424214901.2743946-4-memxor@gmail.com		2022-04-25 20:26:05 -07:00
..
android	android/binder.h: add linux/android/binder(fs).h to UAPI compile-test coverage	2022-02-17 09:09:37 +01:00
byteorder
caif
can	can: isotp: set default value for N_As to 50 micro seconds	2022-03-10 09:23:45 +01:00
cifs
dvb
genwqe
hdlc
hsi
iio	iio: introduce mag_referenced	2022-02-21 19:33:05 +00:00
isdn
misc
mmc
netfilter	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2022-02-10 17:29:56 -08:00
netfilter_arp
netfilter_bridge
netfilter_ipv4
netfilter_ipv6
nfsd
raid
sched
spi
sunrpc
surface_aggregator
tc_act
tc_ematch
usb
a.out.h
acct.h
acrn.h
adb.h
adfs_fs.h
affs_hardblocks.h
agpgart.h
aio_abi.h
am437x-vpfe.h
amt.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.h
baycom.h
bcm933xx_hcs.h
bfs_fs.h
binfmts.h
blkpg.h
blktrace_api.h
blkzoned.h
bpf.h	bpf: Allow storing referenced kptr in map	2022-04-25 20:26:05 -07:00
bpf_common.h
bpf_perf_event.h
bpfilter.h
bpqether.h
bsg.h
bt-bmc.h
btf.h	bpf: Correct the comment for BTF kind bitfield	2022-04-03 17:06:52 -07:00
btrfs.h	btrfs: add definitions and documentation for encoded I/O ioctls	2022-03-14 13:13:51 +01:00
btrfs_tree.h	btrfs: add code to support the block group root	2022-03-14 13:13:48 +01:00
can.h
capability.h
capi.h
cciss_defs.h
cciss_ioctl.h
ccs.h
cdrom.h
cec-funcs.h
cec.h
cfm_bridge.h
cgroupstats.h
chio.h
close_range.h
cm4000_cs.h
cn_proc.h
coda.h
coff.h
comedi.h
connector.h
const.h
coresight-stm.h
counter.h	counter: add new COUNTER_EVENT_CHANGE_OF_STATE	2022-03-18 14:04:30 +01:00
cramfs_fs.h
cryptouser.h
cuda.h
cxl_mem.h
cyclades.h
cycx_cfm.h
dcbnl.h
dccp.h
devlink.h
dlm.h
dlm_device.h
dlm_netlink.h
dlm_plock.h
dlmconstants.h
dm-ioctl.h	dm: add dm_submit_bio_remap interface	2022-02-21 15:36:33 -05:00
dm-log-userspace.h
dma-buf.h
dma-heap.h
dn.h
dns_resolver.h
dqblk_xfs.h
edd.h
efs_fs_sb.h
elf-em.h
elf-fdpic.h
elf.h	execve updates for v5.18-rc1	2022-03-21 19:16:02 -07:00
errno.h
errqueue.h
erspan.h
ethtool.h
ethtool_netlink.h	ethtool: add support to set/get completion queue event size	2022-02-23 20:33:05 -08:00
eventpoll.h
f2fs.h
fadvise.h
falloc.h
fanotify.h
fb.h
fcntl.h
fd.h
fdreg.h
fib_rules.h
fiemap.h
filter.h
firewire-cdev.h
firewire-constants.h
fou.h
fpga-dfl.h
fs.h
fscrypt.h
fsi.h	fsi: sbefifo: Implement FSI_SBEFIFO_READ_TIMEOUT_SECONDS ioctl	2022-02-21 19:38:17 +10:30
fsl_hypervisor.h
fsl_mc.h
fsmap.h	fsmap.h: add linux/fsmap.h to UAPI compile-test coverage	2022-02-17 09:09:37 +01:00
fsverity.h
fuse.h
futex.h
gameport.h
gen_stats.h
genetlink.h
gfs2_ondisk.h
gpio.h
gsmmux.h
gtp.h	gtp: Implement GTP echo request	2022-03-11 08:28:05 -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	hv_utils: Add comment about max VMbus packet size in VSS driver	2022-02-18 13:08:18 +00:00
i2c-dev.h
i2c.h
i2o-dev.h
i8k.h
icmp.h
icmpv6.h
idxd.h
if.h
if_addr.h	net: Add new protocol attribute to IP addresses	2022-02-18 21:20:06 -08:00
if_addrlabel.h
if_alg.h
if_arcnet.h
if_arp.h
if_bonding.h
if_bridge.h	net: bridge: mst: Support setting and reporting MST port states	2022-03-17 16:49:57 -07:00
if_cablemodem.h
if_eql.h
if_ether.h	if_ether.h: add EtherCAT Ethertype	2022-03-01 18:29:27 -08:00
if_fc.h
if_fddi.h
if_hippi.h
if_infiniband.h
if_link.h	net-core: rx_otherhost_dropped to core_stats	2022-04-07 20:32:49 -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	net/sched: Allow flower to match on GTP options	2022-03-11 08:28:27 -08:00
if_vlan.h
if_x25.h
if_xdp.h
ife.h
igmp.h
ila.h
in.h
in6.h
in_route.h
inet_diag.h
inotify.h
input-event-codes.h	HID: add mapping for KEY_ALL_APPLICATIONS	2022-03-03 18:44:21 -08:00
input.h
io_uring.h	io_uring: remove IORING_CQE_F_MSG	2022-03-24 06:53:18 -06:00
ioam6.h
ioam6_genl.h
ioam6_iptunnel.h
ioctl.h
iommu.h	iommu: Remove guest pasid related interfaces and definitions	2022-02-28 13:25:48 +01:00
ioprio.h
ip.h
ip6_tunnel.h
ip_vs.h
ipc.h
ipmi.h
ipmi_bmc.h
ipmi_msgdefs.h
ipsec.h
ipv6.h
ipv6_route.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
kernelcapi.h
kexec.h	kexec.h: add linux/kexec.h to UAPI compile-test coverage	2022-02-17 09:09:38 +01:00
keyboard.h
keyctl.h
kfd_ioctl.h	drm/amdkfd: CRIU export dmabuf handles for GTT BOs	2022-03-15 14:25:17 -04:00
kfd_sysfs.h
kvm.h	KVM: x86: Introduce KVM_CAP_DISABLE_QUIRKS2	2022-03-21 09:28:41 -04:00
kvm_para.h
l2tp.h
landlock.h
libc-compat.h
limits.h
lirc.h	media: lirc: remove unused feature LIRC_CAN_SET_REC_DUTY_CYCLE	2022-03-07 16:29:07 +01:00
llc.h
loop.h	loop: fix ioctl calls using compat_loop_info	2022-03-30 08:54:32 -06:00
lp.h
lwtunnel.h
magic.h	fuse: move FUSE_SUPER_MAGIC definition to magic.h	2022-02-21 14:57:26 +01:00
major.h
map_to_7segment.h
map_to_14segment.h
matroxfb.h
max2175.h
mctp.h	mctp: Add SIOCMCTP{ALLOC,DROP}TAG ioctls for tag control	2022-02-09 12:00:11 +00:00
mdio.h
media-bus-format.h
media.h
mei.h
membarrier.h
memfd.h
mempolicy.h
meye.h
mii.h
minix_fs.h
mman.h
mmtimer.h
module.h
mount.h
mpls.h
mpls_iptunnel.h
mptcp.h	mptcp: introduce implicit endpoints	2022-03-08 22:06:11 -08:00
mqueue.h
mroute.h
mroute6.h	net: ip6mr: add support for passing full packet on wrong mif	2022-02-19 16:05:54 +00:00
mrp_bridge.h
msdos_fs.h
msg.h
mtio.h
nbd-netlink.h
nbd.h
ncsi.h
ndctl.h	nvdimm/region: Delete nd_blk_region infrastructure	2022-03-11 15:53:13 -08:00
neighbour.h
net.h
net_dropmon.h	net: drop_monitor: support drop reason	2022-02-09 17:25:57 -08:00
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
netlink_diag.h
netrom.h
nexthop.h
nfc.h
nfs.h
nfs2.h
nfs3.h
nfs4.h	NFSv4.1 support for NFS4_RESULT_PRESERVER_UNLINKED	2022-02-25 18:50:12 -05:00
nfs4_mount.h
nfs_fs.h	NFS: Remove remaining dfprintks related to fscache and remove NFSDBG_FSCACHE	2022-03-13 12:59:35 -04:00
nfs_idmap.h
nfs_mount.h
nfsacl.h
nilfs2_api.h
nilfs2_ondisk.h
nitro_enclaves.h
nl80211-vnd-intel.h
nl80211.h	nl80211: fix typo of NL80211_IF_TYPE_OCB in documentation	2022-03-11 11:43:55 +01:00
nsfs.h
nubus.h
nvme_ioctl.h	nvme: add vectored-io support for user-passthrough	2022-02-28 13:45:06 +02:00
nvram.h
omap3isp.h	media: omap3isp: Use struct_group() for memcpy() region	2022-02-27 10:58:04 -08:00
omapfb.h
oom.h
openat2.h
openvswitch.h	net: openvswitch: fix uAPI incompatibility with existing user space	2022-03-10 20:14:52 -08:00
packet_diag.h
param.h
parport.h
patchkey.h
pci.h
pci_regs.h
pcitest.h
perf_event.h	Changes for this cycle were:	2022-03-22 13:06:49 -07:00
personality.h
pfkeyv2.h
pfrut.h
pg.h
phantom.h
phonet.h
pidfd.h
pkt_cls.h	net/sched: Allow flower to match on GTP options	2022-03-11 08:28:27 -08:00
pkt_sched.h
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_defs.h
pps.h
pr.h
prctl.h
psample.h
psci.h	KVM: arm64: Expose PSCI SYSTEM_RESET2 call to the guest	2022-02-21 16:02:55 +00:00
psp-sev.h
ptp_clock.h
ptrace.h	ptrace: Move setting/clearing ptrace_message into ptrace_stop	2022-03-18 09:44:19 -05:00
qemu_fw_cfg.h
qnx4_fs.h
qnxtypes.h
qrtr.h
quota.h
radeonfb.h
random.h
rds.h
reboot.h
reiserfs_fs.h
reiserfs_xattr.h	reiserfs_xattr.h: add linux/reiserfs_xattr.h to UAPI compile-test coverage	2022-02-17 09:09:38 +01:00
remoteproc_cdev.h
resource.h
rfkill.h	rfkill: make new event layout opt-in	2022-03-18 13:09:17 +02:00
rio_cm_cdev.h
rio_mport_cdev.h
rkisp1-config.h
romfs_fs.h
rose.h
route.h
rpl.h
rpl_iptunnel.h
rpmsg.h	rpmsg: ctrl: Introduce new RPMSG_CREATE/RELEASE_DEV_IOCTL controls	2022-03-13 11:49:53 -05:00
rpmsg_types.h
rseq.h
rtc.h	rtc: add new RTC_FEATURE_ALARM_WAKEUP_ONLY feature	2022-03-23 19:58:40 +01:00
rtnetlink.h	net: bridge: mst: Support setting and reporting MST port states	2022-03-17 16:49:57 -07:00
rxrpc.h
scc.h
sched.h
scif_ioctl.h
screen_info.h
sctp.h
seccomp.h
securebits.h
sed-opal.h
seg6.h
seg6_genl.h
seg6_hmac.h
seg6_iptunnel.h
seg6_local.h
selinux_netlink.h
sem.h
serial.h
serial_core.h	serial: sunplus-uart: Add Sunplus SoC UART Driver	2022-02-26 10:03:21 +01:00
serial_reg.h
serio.h
shm.h
signal.h
signalfd.h
smc.h	net/smc: Add global configure for handshake limitation by netlink	2022-02-11 11:14:58 +00:00
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
sysinfo.h
target_core_user.h
taskstats.h
tcp.h
tcp_metrics.h
tee.h
termios.h
thermal.h
time.h
time_types.h
timerfd.h
times.h
timex.h
tiocl.h
tipc.h
tipc_config.h	net, uapi: remove inclusion of arpa/inet.h	2022-04-06 13:48:02 +01:00
tipc_netlink.h
tipc_sockets_diag.h
tls.h
toshiba.h
tty.h	tty: Reserve ldisc 29 for development purposes	2022-02-26 10:03:21 +01:00
tty_flags.h
types.h	Documentation/sparse: add hints about __CHECKER__	2022-03-23 19:00:33 -07:00
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: provide unmasked address on page-fault	2022-03-22 15:57:08 -07:00
userio.h
utime.h
utsname.h
uuid.h
uvcvideo.h
v4l2-common.h
v4l2-controls.h	Even yet more V4L2 patches for 5.18	2022-03-07 16:43:14 +01:00
v4l2-dv-timings.h
v4l2-mediabus.h
v4l2-subdev.h
vbox_err.h
vbox_vmmdev_types.h
vboxguest.h
vdpa.h
vduse.h
veth.h
vfio.h	vfio: Remove migration protocol v1 documentation	2022-03-03 13:01:19 +02:00
vfio_ccw.h
vfio_zdev.h
vhost.h	vdpa: support exposing the count of vqs to userspace	2022-03-28 16:53:00 -04:00
vhost_types.h
videodev2.h	media: add nv12m_8l128 and nv12m_10be_8l128 video format.	2022-03-07 17:13:31 +01:00
virtio_9p.h
virtio_balloon.h
virtio_blk.h
virtio_bt.h
virtio_config.h	Add definition of VIRTIO_F_IN_ORDER feature bit	2022-03-28 16:52:58 -04:00
virtio_console.h
virtio_crypto.h	virtio-crypto: introduce akcipher service	2022-03-28 16:52:58 -04:00
virtio_fs.h
virtio_gpio.h
virtio_gpu.h
virtio_i2c.h
virtio_ids.h
virtio_input.h
virtio_iommu.h
virtio_mem.h
virtio_mmio.h
virtio_net.h
virtio_pci.h
virtio_pcidev.h
virtio_pmem.h
virtio_ring.h
virtio_rng.h
virtio_scmi.h
virtio_scsi.h
virtio_snd.h
virtio_types.h
virtio_vsock.h
vm_sockets.h
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
wwan.h
x25.h
xattr.h
xdp_diag.h
xfrm.h	xfrm: enforce validity of offload input flags	2022-02-09 09:00:40 +01:00
xilinx-v4l2-controls.h
zorro.h
zorro_ids.h