netdev - [PATCH bpf-next v2 0/3] Make 2-byte access to bpf_sk_lookup->remote

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Sat, 19 Mar 2022 19:33:53 +0100
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        kernel-team@...udflare.com, Martin KaFai Lau <kafai@...com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: [PATCH bpf-next v2 0/3] Make 2-byte access to bpf_sk_lookup->remote_port endian-agnostic

This patch set is a result of a discussion we had around the RFC patchset from
Ilya [1]. The fix for the narrow loads from the RFC series is still relevant,
but this series does not depend on it. Nor is it required to unbreak sk_lookup
tests on BE, if this series gets applied.

To summarize the takeaways from [1]:

 1) we want to make 2-byte load from ctx->remote_port portable across LE and BE,
 2) we keep the 4-byte load from ctx->remote_port as it is today - result varies
    on endianess of the platform.

[1] https://lore.kernel.org/bpf/20220222182559.2865596-2-iii@linux.ibm.com/

v1 -> v2:
- Remove needless check that 4-byte load is from &ctx->remote_port offset
  (Martin)

[v1]: https://lore.kernel.org/bpf/20220317165826.1099418-1-jakub@cloudflare.com/

Jakub Sitnicki (3):
  bpf: Treat bpf_sk_lookup remote_port as a 2-byte field
  selftests/bpf: Fix u8 narrow load checks for bpf_sk_lookup remote_port
  selftests/bpf: Fix test for 4-byte load from remote_port on big-endian

 net/core/filter.c                             | 20 +++++++++++++++++--
 .../selftests/bpf/progs/test_sk_lookup.c      | 13 ++++++++----
 2 files changed, 27 insertions(+), 6 deletions(-)

-- 
2.35.1