linux-toradex.git/net/netlink, branch v6.1-rc1

genetlink: reject use of nlmsg_flags for new commands

2022-10-01T00:43:09+00:00

Commit 9c5d03d36251 ("genetlink: start to validate reserved header bytes")
introduced extra validation for genetlink headers. We had to gate it
to only apply to new commands, to maintain bug-wards compatibility.
Use this opportunity (before the new checks make it to Linus's tree)
to add more conditions.

Validate that Generic Netlink families do not use nlmsg_flags outside
of the well-understood set.

Link: https://lore.kernel.org/all/20220928073709.1b93b74a@kernel.org/
Reviewed-by: Johannes Berg 
Acked-by: Nikolay Aleksandrov 
Reviewed-by: Nicolas Dichtel 
Reviewed-by: Guillaume Nault 
Reviewed-by: Jacob Keller 
Link: https://lore.kernel.org/r/20220929142809.1167546-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski

netlink: Bounds-check struct nlmsgerr creation

2022-09-05T13:45:22+00:00

In preparation for FORTIFY_SOURCE doing bounds-check on memcpy(),
switch from __nlmsg_put to nlmsg_put(), and explain the bounds check
for dealing with the memcpy() across a composite flexible array struct.
Avoids this future run-time warning:

  memcpy: detected field-spanning write (size 32) of single field "&errmsg->msg" at net/netlink/af_netlink.c:2447 (size 16)

Cc: Jakub Kicinski 
Cc: Pablo Neira Ayuso 
Cc: Jozsef Kadlecsik 
Cc: Florian Westphal 
Cc: "David S. Miller" 
Cc: Eric Dumazet 
Cc: Paolo Abeni 
Cc: syzbot 
Cc: netfilter-devel@vger.kernel.org
Cc: coreteam@netfilter.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook 
Link: https://lore.kernel.org/r/20220901071336.1418572-1-keescook@chromium.org
Signed-off-by: David S. Miller

netlink: add support for ext_ack missing attributes

2022-08-30T10:20:43+00:00

There is currently no way to report via extack in a structured way
that an attribute is missing. This leads to families resorting to
string messages.

Add a pair of attributes - @offset and @type for machine-readable
way of reporting missing attributes. The @offset points to the
nest which should have contained the attribute, @type is the
expected nla_type. The offset will be skipped if the attribute
is missing at the message level rather than inside a nest.

User space should be able to figure out which attribute enum
(AKA attribute space AKA attribute set) the nest pointed to by
@offset is using.

Reviewed-by: Johannes Berg 
Signed-off-by: Jakub Kicinski 
Signed-off-by: Paolo Abeni

netlink: factor out extack composition

2022-08-30T10:20:43+00:00

The ext_ack writing code looks very "organically grown".
Move the calculation of the size and writing out to helpers.
This is more idiomatic and gives us the ability to return early
avoiding the long (and randomly ordered) "if" conditions.

Reviewed-by: Johannes Berg 
Signed-off-by: Jakub Kicinski 
Signed-off-by: Paolo Abeni

genetlink: start to validate reserved header bytes

2022-08-29T11:47:15+00:00

We had historically not checked that genlmsghdr.reserved
is 0 on input which prevents us from using those precious
bytes in the future.

One use case would be to extend the cmd field, which is
currently just 8 bits wide and 256 is not a lot of commands
for some core families.

To make sure that new families do the right thing by default
put the onus of opting out of validation on existing families.

Signed-off-by: Jakub Kicinski 
Acked-by: Paul Moore  (NetLabel)
Signed-off-by: David S. Miller

genetlink: hold read cb_lock during iteration of genl_fam_idr in genl_bind()

2022-08-27T01:47:21+00:00

In genl_bind(), currently genl_lock and write cb_lock are taken
for iteration of genl_fam_idr and processing of static values
stored in struct genl_family. Take just read cb_lock for this task
as it is sufficient to guard the idr and the struct against
concurrent genl_register/unregister_family() calls.

This will allow to run genl command processing in genl_rcv() and
mnl_socket_setsockopt(.., NETLINK_ADD_MEMBERSHIP, ..) in parallel.

Reported-by: Vikas Gupta 
Signed-off-by: Jiri Pirko 
Link: https://lore.kernel.org/r/20220825081940.1283335-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski

net: genl: fix error path memory leak in policy dumping

2022-08-18T17:20:48+00:00

If construction of the array of policies fails when recording
non-first policy we need to unwind.

netlink_policy_dump_add_policy() itself also needs fixing as
it currently gives up on error without recording the allocated
pointer in the pstate pointer.

Reported-by: syzbot+dc54d9ba8153b216cae0@syzkaller.appspotmail.com
Fixes: 50a896cf2d6f ("genetlink: properly support per-op policy dumping")
Link: https://lore.kernel.org/r/20220816161939.577583-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2022-05-12T23:15:30+00:00

No conflicts.

Build issue in drivers/net/ethernet/sfc/ptp.c
  54fccfdd7c66 ("sfc: efx_default_channel_type APIs can be static")
  49e6123c65da ("net: sfc: fix memory leak due to ptp channel")
https://lore.kernel.org/all/20220510130556.52598fe2@canb.auug.org.au/

Signed-off-by: Jakub Kicinski

netlink: do not reset transport header in netlink_recvmsg()

2022-05-06T22:37:36+00:00

netlink_recvmsg() does not need to change transport header.

If transport header was needed, it should have been reset
by the producer (netlink_dump()), not the consumer(s).

The following trace probably happened when multiple threads
were using MSG_PEEK.

BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg

write to 0xffff88811e9f15b2 of 2 bytes by task 32012 on cpu 1:
 skb_reset_transport_header include/linux/skbuff.h:2760 [inline]
 netlink_recvmsg+0x1de/0x790 net/netlink/af_netlink.c:1978
 sock_recvmsg_nosec net/socket.c:948 [inline]
 sock_recvmsg net/socket.c:966 [inline]
 __sys_recvfrom+0x204/0x2c0 net/socket.c:2097
 __do_sys_recvfrom net/socket.c:2115 [inline]
 __se_sys_recvfrom net/socket.c:2111 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2111
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff88811e9f15b2 of 2 bytes by task 32005 on cpu 0:
 skb_reset_transport_header include/linux/skbuff.h:2760 [inline]
 netlink_recvmsg+0x1de/0x790 net/netlink/af_netlink.c:1978
 ____sys_recvmsg+0x162/0x2f0
 ___sys_recvmsg net/socket.c:2674 [inline]
 __sys_recvmsg+0x209/0x3f0 net/socket.c:2704
 __do_sys_recvmsg net/socket.c:2714 [inline]
 __se_sys_recvmsg net/socket.c:2711 [inline]
 __x64_sys_recvmsg+0x42/0x50 net/socket.c:2711
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff -> 0x0000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 32005 Comm: syz-executor.4 Not tainted 5.18.0-rc1-syzkaller-00328-ge1f700ebd6be-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet 
Reported-by: syzbot 
Link: https://lore.kernel.org/r/20220505161946.2867638-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2022-04-22T07:56:00+00:00

drivers/net/ethernet/microchip/lan966x/lan966x_main.c
  d08ed852560e ("net: lan966x: Make sure to release ptp interrupt")
  c8349639324a ("net: lan966x: Add FDMA functionality")

Signed-off-by: Paolo Abeni