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Peter Collingbourne cab0003311 net: don't unconditionally copy_from_user a struct ifreq for socket ioctls 
commit d0efb16294d145d157432feda83877ae9d7cdf37 upstream.

A common implementation of isatty(3) involves calling a ioctl passing
a dummy struct argument and checking whether the syscall failed --
bionic and glibc use TCGETS (passing a struct termios), and musl uses
TIOCGWINSZ (passing a struct winsize). If the FD is a socket, we will
copy sizeof(struct ifreq) bytes of data from the argument and return
-EFAULT if that fails. The result is that the isatty implementations
may return a non-POSIX-compliant value in errno in the case where part
of the dummy struct argument is inaccessible, as both struct termios
and struct winsize are smaller than struct ifreq (at least on arm64).

Although there is usually enough stack space following the argument
on the stack that this did not present a practical problem up to now,
with MTE stack instrumentation it's more likely for the copy to fail,
as the memory following the struct may have a different tag.

Fix the problem by adding an early check for whether the ioctl is a
valid socket ioctl, and return -ENOTTY if it isn't.

Fixes: 44c02a2c3d ("dev_ioctl(): move copyin/copyout to callers")
Link: https://linux-review.googlesource.com/id/I869da6cf6daabc3e4b7b82ac979683ba05e27d4d
Signed-off-by: Peter Collingbourne <pcc@google.com>
Cc: <stable@vger.kernel.org> # 4.19
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-09-03 10:08:16 +02:00
..
6lowpan 6lowpan: no need to check return value of debugfs_create functions 2019-07-06 12:50:01 +02:00
9p net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid 2020-11-05 11:43:20 +01:00
802 net/802/garp: fix memleak in garp_request_join() 2021-07-31 08:19:38 +02:00
8021q net: vlan: avoid leaks on register_vlan_dev() failures 2021-01-17 14:05:31 +01:00
appletalk appletalk: Fix skb allocation size in loopback case 2021-04-07 14:47:41 +02:00
atm atm: fix a memory leak of vcc->user_back 2020-10-01 13:17:58 +02:00
ax25 AX.25: Prevent integer overflows in connect and sendmsg 2020-07-31 18:39:31 +02:00
batman-adv batman-adv: Avoid WARN_ON timing related checks 2021-06-23 14:41:23 +02:00
bluetooth Bluetooth: hidp: use correct wait queue when removing ctrl_wait 2021-08-26 08:36:15 -04:00
bpf bpf/flow_dissector: support flags in BPF_PROG_TEST_RUN 2019-07-25 18:00:41 -07:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-07-14 16:53:33 +02:00
bridge net: bridge: fix memleak in br_add_if() 2021-08-18 08:57:00 +02:00
caif net: fix uninit-value in caif_seqpkt_sendmsg 2021-07-28 13:30:56 +02:00
can can: j1939: j1939_session_deactivate(): clarify lifetime of session object 2021-08-04 12:27:40 +02:00
ceph libceph: clear con->out_msg on Policy::stateful_server faults 2020-11-05 11:43:34 +01:00
core rtnetlink: Return correct error on changing device netns 2021-09-03 10:08:14 +02:00
dcb net: dcb: Accept RTM_GETDCB messages carrying set-like DCB commands 2021-01-23 15:57:59 +01:00
dccp dccp: add do-while-0 stubs for dccp_pr_debug macros 2021-08-26 08:36:16 -04:00
decnet net: decnet: Fix sleeping inside in af_decnet 2021-07-28 13:30:56 +02:00
dns_resolver KEYS: Don't write out to userspace while holding key semaphore 2020-04-23 10:36:45 +02:00
dsa net: dsa: fix error code getting shifted with 4 in dsa_slave_get_sset_count 2021-06-03 08:59:12 +02:00
ethernet net: add annotations on hh->hh_len lockless accesses 2020-01-09 10:20:06 +01:00
hsr hsr: use netdev_err() instead of WARN_ONCE() 2021-05-14 09:44:10 +02:00
ieee802154 net: Fix memory leak in ieee802154_raw_deliver 2021-08-18 08:57:00 +02:00
ife net: Fix Kconfig indentation 2019-09-26 08:56:17 +02:00
ipv4 ip_gre: add validation for csum_start 2021-09-03 10:08:13 +02:00
ipv6 ipv6: ip6_finish_output2: set sk into newly allocated nskb 2021-07-31 08:19:39 +02:00
iucv net/af_iucv: remove WARN_ONCE on malformed RX packets 2021-03-07 12:20:42 +01:00
kcm kcm: disable preemption in kcm_parse_func_strparser() 2019-09-27 10:27:14 +02:00
key af_key: relax availability checks for skb size calculation 2021-02-13 13:52:54 +01:00
l2tp l2tp: remove skb_dst_set() from l2tp_xmit_skb() 2020-07-22 09:32:47 +02:00
l3mdev ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF 2019-06-23 13:24:17 -07:00
lapb net: lapb: Copy the skb before sending a packet 2021-02-10 09:25:28 +01:00
llc net: llc: fix skb_over_panic 2021-08-04 12:27:39 +02:00
mac80211 mac80211: remove iwlwifi specific workaround NDPs of null_response 2021-07-14 16:53:32 +02:00
mac802154 net: mac802154: Fix general protection fault 2021-04-14 08:24:18 +02:00
mpls net: avoid infinite loop in mpls_gso_segment when mpls_hlen == 0 2021-03-17 17:03:31 +01:00
ncsi net/ncsi: Avoid channel_monitor hrtimer deadlock 2021-04-14 08:24:15 +02:00
netfilter netfilter: conntrack: collect all entries in one cycle 2021-09-03 10:08:12 +02:00
netlabel netlabel: Fix memory leak in netlbl_mgmt_add_common 2021-07-14 16:53:29 +02:00
netlink netlink: disable IRQs for netlink_lock_table() 2021-06-16 11:59:34 +02:00
netrom netrom: Decrease sock refcount when sock timers expire 2021-07-28 13:30:56 +02:00
nfc net/nfc/rawsock.c: fix a permission check bug 2021-06-16 11:59:33 +02:00
nsh treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
openvswitch ovs: clear skb->tstamp in forwarding path 2021-08-26 08:36:19 -04:00
packet net/packet: annotate accesses to po->ifindex 2021-06-30 08:47:48 -04:00
phonet net: use skb_queue_empty_lockless() in poll() handlers 2019-10-28 13:33:41 -07:00
psample net: psample: fix skb_over_panic 2019-12-04 22:30:54 +01:00
qrtr net: qrtr: fix another OOB Read in qrtr_endpoint_post 2021-09-03 10:08:12 +02:00
rds net/rds: dma_map_sg is entitled to merge entries 2021-09-03 10:08:15 +02:00
rfkill rfkill: Fix use-after-free in rfkill_resume() 2020-11-24 13:29:05 +01:00
rose rose: Fix Null pointer dereference in rose_send_frame() 2020-12-08 10:40:23 +01:00
rxrpc rxrpc: Fix clearance of Tx/Rx ring when releasing a call 2021-02-17 10:35:18 +01:00
sched net: sched: act_mirred: Reset ct info when mirror/redirect skb 2021-08-18 08:56:59 +02:00
sctp sctp: move the active_key update after sh_keys is added 2021-08-12 13:20:57 +02:00
smc Revert "net/smc: fix a NULL pointer dereference" 2021-06-03 08:59:08 +02:00
strparser Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-22 08:59:24 -04:00
sunrpc SUNRPC: Should wake up the privileged task firstly. 2021-07-14 16:53:05 +02:00
switchdev net: switchdev: don't set port_obj_info->handled true when -EOPNOTSUPP 2021-02-07 15:35:46 +01:00
tipc tipc: fix sleeping in tipc accept routine 2021-08-04 12:27:39 +02:00
tls tls: prevent oversized sendfile() hangs by ignoring MSG_MORE 2021-07-14 16:53:31 +02:00
unix af_unix: fix garbage collect vs MSG_PEEK 2021-07-31 08:19:37 +02:00
vmw_vsock vsock/virtio: avoid potential deadlock when vsock device remove 2021-08-18 08:57:01 +02:00
wimax wimax: no need to check return value of debugfs_create functions 2019-08-10 15:25:47 -07:00
wireless cfg80211: Fix possible memory leak in function cfg80211_bss_update 2021-08-04 12:27:38 +02:00
x25 net/x25: Return the correct errno code 2021-06-18 09:59:00 +02:00
xdp xsk: Simplify detection of empty and full rings 2021-05-22 11:38:27 +02:00
xfrm xfrm: Fix error reporting in xfrm_state_construct. 2021-07-19 08:53:11 +02:00
Kconfig net: Fix CONFIG_NET_CLS_ACT=n and CONFIG_NFT_FWD_NETDEV={y, m} build 2020-04-01 11:02:18 +02:00
Makefile
…
compat.c net: Return the correct errno code 2021-06-18 09:59:00 +02:00
socket.c net: don't unconditionally copy_from_user a struct ifreq for socket ioctls 2021-09-03 10:08:16 +02:00
sysctl_net.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00