From: Martin KaFai Lau <kafai@fb.com>
To: <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>,
Yonghong Song <yhs@fb.com>
Subject: [PATCH bpf-next 0/2] bpf: Allow doing stack read with size larger than the earlier spilled reg
Date: Mon, 1 Nov 2021 23:45:28 -0700 [thread overview]
Message-ID: <20211102064528.315637-1-kafai@fb.com> (raw)
This set fixes an issue that the verifier rejects a u64 stack read
after an earlier u32 scalar spill. It is caused by the earlier commit
that allows tracking the spilled u32 scalar reg.
Martin KaFai Lau (2):
bpf: Do not reject when the stack read size is different from the
tracked scalar size
bpf: selftest: verifier test on refill from a smaller spill
kernel/bpf/verifier.c | 18 ++++++------------
.../selftests/bpf/verifier/spill_fill.c | 17 +++++++++++++++++
2 files changed, 23 insertions(+), 12 deletions(-)
--
2.30.2
next reply other threads:[~2021-11-02 6:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-02 6:45 Martin KaFai Lau [this message]
2021-11-02 6:45 ` [PATCH bpf-next 1/2] bpf: Do not reject when the stack read size is different from the tracked scalar size Martin KaFai Lau
2021-11-02 13:45 ` Hengqi Chen
2021-11-02 15:59 ` Yonghong Song
2021-11-02 6:45 ` [PATCH bpf-next 2/2] bpf: selftest: verifier test on refill from a smaller spill Martin KaFai Lau
2021-11-02 15:59 ` Yonghong Song
2021-11-03 15:00 ` [PATCH bpf-next 0/2] bpf: Allow doing stack read with size larger than the earlier spilled reg patchwork-bot+netdevbpf
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