From: Krzesimir Nowak <krzesimir@kinvolk.io>
To: bpf@vger.kernel.org
Cc: iago@kinvolk.io, alban@kinvolk.io,
Krzesimir Nowak <krzesimir@kinvolk.io>,
Shuah Khan <shuah@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrey Ignatov <rdna@fb.com>,
Jiong Wang <jiong.wang@netronome.com>,
Jakub Kicinski <jakub.kicinski@netronome.com>,
linux-kselftest@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH bpf v1 0/3] Test the 32bit narrow reads
Date: Wed, 15 May 2019 15:47:25 +0200 [thread overview]
Message-ID: <20190515134731.12611-1-krzesimir@kinvolk.io> (raw)
These patches try to test the fix made in commit e2f7fc0ac695 ("bpf:
fix undefined behavior in narrow load handling"). The problem existed
in the generated BPF bytecode that was doing a 32bit narrow read of a
64bit field, so to test it the code would need to be executed.
Currently the only such field exists in BPF_PROG_TYPE_PERF_EVENT,
which is not supported by bpf_prog_test_run().
First commit adds the test, but since I can't run it, I'm not sure if
it is even valid (because endianness, for example). Second commit adds
a message to test_verifier when it couldn't run the program because of
lack permissions or program type being not supported. Third commit
fixes a possible problem with errno.
With these patches, I get the following output on my test:
/kernel/tools/testing/selftests/bpf$ sudo ./test_verifier 920 920
#920/p 32bit loads of a 64bit field (both least and most significant words) Did not run the program (not supported) OK
Summary: 1 PASSED, 0 SKIPPED, 0 FAILED
So it looks like I need to pick a different approach.
Krzesimir Nowak (3):
selftests/bpf: Test correctness of narrow 32bit read on 64bit field
selftests/bpf: Print a message when tester could not run a program
selftests/bpf: Avoid a clobbering of errno
tools/testing/selftests/bpf/test_verifier.c | 19 +++++++++++++++----
.../testing/selftests/bpf/verifier/var_off.c | 15 +++++++++++++++
2 files changed, 30 insertions(+), 4 deletions(-)
--
2.20.1
next reply other threads:[~2019-05-15 13:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-15 13:47 Krzesimir Nowak [this message]
2019-05-15 13:47 ` [PATCH bpf v1 1/3] selftests/bpf: Test correctness of narrow 32bit read on 64bit field Krzesimir Nowak
2019-05-23 16:02 ` Daniel Borkmann
2019-05-15 13:47 ` [PATCH bpf v1 2/3] selftests/bpf: Print a message when tester could not run a program Krzesimir Nowak
2019-05-15 21:45 ` Jakub Kicinski
2019-05-16 9:29 ` Krzesimir Nowak
2019-05-16 15:50 ` Jakub Kicinski
2019-05-16 16:21 ` Krzesimir Nowak
2019-05-16 16:54 ` Jakub Kicinski
2019-05-15 13:47 ` [PATCH bpf v1 3/3] selftests/bpf: Avoid a clobbering of errno Krzesimir Nowak
2019-05-15 21:50 ` Jakub Kicinski
2019-05-16 9:31 ` Krzesimir Nowak
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