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| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2026-09-04 10:43:19 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-09-04 07:58:36 -0700 |
| commit | 6668ed271eaefaa63e686bdfbedaeb7b8e492722 (patch) | |
| tree | 58e8288fead484f6755ad0815fc74c3742663761 /Documentation/netlink/specs/handshake.yaml | |
| download | linux-stable-6668ed271eaefaa63e686bdfbedaeb7b8e492722.tar.gz linux-stable-6668ed271eaefaa63e686bdfbedaeb7b8e492722.zip | |
selftests/bpf: Reject graph kptr use after RCU unlockgrafted
Add a sleepable verifier test that loads a graph-node local kptr in an
explicit RCU read-side critical section, then passes its node to
bpf_rbtree_remove() after the section ends.
Before the verifier fix, the stale NON_OWN_REF flag makes the node look like
a live borrowed reference and the program is accepted. After the fix, the
pointer is demoted without NON_OWN_REF and the graph kfunc argument is
rejected.
Also exercise a graph kptr loaded while a spin lock provides implicit RCU
protection. The pointer must be invalidated when the lock is released, which
guards the required ordering between non-owning-reference invalidation and
RCU demotion.
Update the existing fault-protected load test state description. The
post-unlock pointer no longer carries NON_OWN_REF, but remains readable
because the load is rewritten to use BPF_PROBE_MEM.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'Documentation/netlink/specs/handshake.yaml')
| -rw-r--r-- | Documentation/netlink/specs/handshake.yaml | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/Documentation/netlink/specs/handshake.yaml b/Documentation/netlink/specs/handshake.yaml new file mode 100644 index 000000000..ffec12b46 --- /dev/null +++ b/Documentation/netlink/specs/handshake.yaml @@ -0,0 +1,141 @@ +# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) +# +# Author: Chuck Lever <chuck.lever@oracle.com> +# +# Copyright (c) 2023, Oracle and/or its affiliates. +# +--- +name: handshake + +protocol: genetlink + +doc: Netlink protocol to request a transport layer security handshake. + +definitions: + - + type: const + name: max-errno + value: 4095 + header: linux/err.h + scope: kernel + - + type: enum + name: handler-class + value-start: 0 + entries: [none, tlshd, max] + - + type: enum + name: msg-type + value-start: 0 + entries: [unspec, clienthello, serverhello] + - + type: enum + name: auth + value-start: 0 + entries: [unspec, unauth, psk, x509] + +attribute-sets: + - + name: x509 + attributes: + - + name: cert + type: s32 + - + name: privkey + type: s32 + - + name: accept + attributes: + - + name: sockfd + type: s32 + - + name: handler-class + type: u32 + enum: handler-class + - + name: message-type + type: u32 + enum: msg-type + - + name: timeout + type: u32 + - + name: auth-mode + type: u32 + enum: auth + - + name: peer-identity + type: u32 + multi-attr: true + - + name: certificate + type: nest + nested-attributes: x509 + multi-attr: true + - + name: peername + type: string + - + name: keyring + type: u32 + - + name: done + attributes: + - + name: status + type: u32 + checks: + max: max-errno + - + name: sockfd + type: s32 + - + name: remote-auth + type: u32 + multi-attr: true + +operations: + list: + - + name: ready + doc: Notify handlers that a new handshake request is waiting + notify: accept + - + name: accept + doc: Handler retrieves next queued handshake request + attribute-set: accept + flags: [admin-perm] + do: + request: + attributes: + - handler-class + reply: + attributes: + - sockfd + - message-type + - timeout + - auth-mode + - peer-identity + - certificate + - peername + - keyring + - + name: done + doc: Handler reports handshake completion + attribute-set: done + flags: [admin-perm] + do: + request: + attributes: + - status + - sockfd + - remote-auth + +mcast-groups: + list: + - + name: none + - + name: tlshd |