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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/lockd.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/lockd.yaml')
| -rw-r--r-- | Documentation/netlink/specs/lockd.yaml | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/netlink/specs/lockd.yaml b/Documentation/netlink/specs/lockd.yaml new file mode 100644 index 000000000..3dc4ac1a0 --- /dev/null +++ b/Documentation/netlink/specs/lockd.yaml @@ -0,0 +1,45 @@ +# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) +--- +name: lockd +protocol: genetlink +uapi-header: linux/lockd_netlink.h + +doc: lockd configuration over generic netlink + +attribute-sets: + - + name: server + attributes: + - + name: gracetime + type: u32 + - + name: tcp-port + type: u16 + - + name: udp-port + type: u16 + +operations: + list: + - + name: server-set + doc: set the lockd server parameters + attribute-set: server + flags: [admin-perm] + do: + request: + attributes: + - gracetime + - tcp-port + - udp-port + - + name: server-get + doc: get the lockd server parameters + attribute-set: server + do: + reply: + attributes: + - gracetime + - tcp-port + - udp-port |