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Yonghong Song c6f1bfe89a bpf: reject program if a __user tagged memory accessed in kernel way 
BPF verifier supports direct memory access for BPF_PROG_TYPE_TRACING type
of bpf programs, e.g., a->b. If "a" is a pointer
pointing to kernel memory, bpf verifier will allow user to write
code in C like a->b and the verifier will translate it to a kernel
load properly. If "a" is a pointer to user memory, it is expected
that bpf developer should be bpf_probe_read_user() helper to
get the value a->b. Without utilizing BTF __user tagging information,
current verifier will assume that a->b is a kernel memory access
and this may generate incorrect result.

Now BTF contains __user information, it can check whether the
pointer points to a user memory or not. If it is, the verifier
can reject the program and force users to use bpf_probe_read_user()
helper explicitly.

In the future, we can easily extend btf_add_space for other
address space tagging, for example, rcu/percpu etc.

Signed-off-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20220127154606.654961-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2022-01-27 12:03:46 -08:00
..
6lowpan
9p virtio,vdpa,qemu_fw_cfg: features, cleanups, fixes 2022-01-18 10:05:48 +02:00
802 net: 802: Use memset_startat() to clear struct fields 2021-11-19 11:23:23 +00:00
8021q vlan: add net device refcount tracker 2021-12-07 20:44:58 -08:00
appletalk
atm net: atm: use address setting helpers 2021-10-24 13:59:45 +01:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-09 17:00:17 -08:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
bluetooth Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2022-01-17 05:49:30 +02:00
bpf bpf: reject program if a __user tagged memory accessed in kernel way 2022-01-27 12:03:46 -08:00
bpfilter
bridge net: bridge: fix net device refcount tracking issue in error path 2022-01-12 14:44:18 +00:00
caif Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-31 14:35:40 +00:00
can can: isotp: convert struct tpcon::{idx,len} to unsigned int 2022-01-05 21:49:47 +01:00
ceph mm: allow !GFP_KERNEL allocations for kvmalloc 2022-01-15 16:30:29 +02:00
core Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-01-24 15:42:29 -08:00
dcb
dccp dccp: Inline dccp_listen_start(). 2021-11-23 20:16:22 -08:00
decnet Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-31 14:35:40 +00:00
dns_resolver
dsa net: dsa: setup master before ports 2022-01-06 11:59:10 +00:00
ethernet gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers 2021-11-24 17:21:42 -08:00
ethtool ethtool: use phydev variable 2022-01-06 12:33:35 +00:00
hsr net: Write lock dev_base_lock without disabling bottom halves. 2021-11-29 12:12:36 +00:00
ieee802154 net: drop nopreempt requirement on sock_prot_inuse_add() 2021-11-16 13:20:45 +00:00
ife
ipv4 bpf: reject program if a __user tagged memory accessed in kernel way 2022-01-27 12:03:46 -08:00
ipv6 ipv6: annotate accesses to fn->fn_sernum 2022-01-20 20:18:37 -08:00
iucv net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
kcm net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
key
l2tp l2tp: add netns refcount tracker to l2tp_dfs_seq_data 2021-12-10 06:38:27 -08:00
l3mdev
lapb
llc sock: Use sock_owned_by_user_nocheck() instead of sk_lock.owned. 2021-12-10 19:43:00 -08:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
mac802154 mac802154: use dev_addr_set() - manual 2021-10-20 14:27:40 +01:00
mctp mctp: test: zero out sockaddr 2022-01-11 20:26:36 -08:00
mpls Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-02 11:44:56 -08:00
mptcp mptcp: Use struct_group() to avoid cross-field memset() 2022-01-21 19:26:03 -08:00
ncsi net/ncsi: check for error return from call to nla_put_u32 2021-12-29 17:53:24 -08:00
netfilter Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-01-24 15:42:29 -08:00
netlabel lsm: security_task_getsecid_subj() -> security_current_getsecid_subj() 2021-11-22 17:52:47 -05:00
netlink net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
netrom netrom: fix api breakage in nr_setsockopt() 2022-01-07 14:11:05 +00:00
nfc Networking fixes for 5.17-rc1, including fixes from netfilter, bpf. 2022-01-20 10:57:05 +02:00
nsh
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-09 17:00:17 -08:00
packet net: fix information leakage in /proc/net/ptype 2022-01-20 10:12:53 +00:00
phonet phonet/pep: refuse to enable an unbound pipe 2021-12-20 11:49:51 +00:00
psample
qrtr bus: mhi: core: Add an API for auto queueing buffers for DL channel 2021-12-17 17:17:14 +01:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-16 16:13:19 -08:00
rfkill rfkill: allow to get the software rfkill state 2021-12-20 11:02:38 +01:00
rose net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
rxrpc rxrpc: Adjust retransmission backoff 2022-01-22 02:03:24 +00:00
sched net: sched: Clarify error message when qdisc kind is unknown 2022-01-20 11:25:57 +00:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
smc net/smc: Transitional solution for clcsock race issue 2022-01-24 12:06:08 +00:00
strparser bpf: sockmap, strparser, and tls are reusing qdisc_skb_cb and colliding 2021-11-09 01:05:28 +01:00
sunrpc Highlights: 2022-01-16 07:42:58 +02:00
switchdev net: switchdev: add net device refcount tracker 2021-12-07 20:44:58 -08:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
tls net/tls: Fix another skb memory leak when running kTLS traffic 2022-01-17 13:07:47 +00:00
unix Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-01-24 15:42:29 -08:00
vmw_vsock virtio,vdpa,qemu_fw_cfg: features, cleanups, fixes 2022-01-18 10:05:48 +02:00
wireless Kbuild updates for v5.17 2022-01-19 11:15:19 +02:00
x25 net: x25: drop harmless check of !more 2021-12-09 18:35:11 -08:00
xdp i40e: xsk: Move tmp desc array from driver to pool 2022-01-27 17:25:32 +01:00
xfrm xfrm: Don't accidentally set RTO_ONLINK in decode_session4() 2022-01-11 20:36:08 -08:00
compat.c
devres.c
Kconfig net: kunit: add a test for dev_addr_lists 2021-11-20 12:25:57 +00:00
Kconfig.debug net: add networking namespace refcount tracker 2021-12-10 06:38:26 -08:00
Makefile
socket.c net: fix SOF_TIMESTAMPING_BIND_PHC to work with multiple sockets 2022-01-06 12:18:08 +00:00
sysctl_net.c sections: move and rename core_kernel_data() to is_kernel_core_data() 2021-11-09 10:02:50 -08:00