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[95.90.237.190]) by smtp.gmail.com with ESMTPSA id e6sm18255086wrw.23.2019.07.08.09.31.48 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 08 Jul 2019 09:31:49 -0700 (PDT) From: Krzesimir Nowak To: linux-kernel@vger.kernel.org Cc: Alban Crequy , =?UTF-8?q?Iago=20L=C3=B3pez=20Galeiras?= , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , netdev@vger.kernel.org, bpf@vger.kernel.org, xdp-newbies@vger.kernel.org, Krzesimir Nowak Subject: [bpf-next v3 03/12] selftests/bpf: Avoid another case of errno clobbering Date: Mon, 8 Jul 2019 18:31:12 +0200 Message-Id: <20190708163121.18477-4-krzesimir@kinvolk.io> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190708163121.18477-1-krzesimir@kinvolk.io> References: <20190708163121.18477-1-krzesimir@kinvolk.io> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit 8184d44c9a57 ("selftests/bpf: skip verifier tests for unsupported program types") added a check for an unsupported program type. The function doing it changes errno, so test_verifier should save it before calling it if test_verifier wants to print a reason why verifying a BPF program of a supported type failed. Changes since v2: - Move the declaration to fit the reverse christmas tree style. Fixes: 8184d44c9a57 ("selftests/bpf: skip verifier tests for unsupported program types") Cc: Stanislav Fomichev Signed-off-by: Krzesimir Nowak --- tools/testing/selftests/bpf/test_verifier.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c index 3fe126e0083b..c7541f572932 100644 --- a/tools/testing/selftests/bpf/test_verifier.c +++ b/tools/testing/selftests/bpf/test_verifier.c @@ -864,6 +864,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv, int run_errs, run_successes; int map_fds[MAX_NR_MAPS]; const char *expected_err; + int saved_errno; int fixup_skips; __u32 pflags; int i, err; @@ -894,6 +895,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv, pflags |= BPF_F_ANY_ALIGNMENT; fd_prog = bpf_verify_program(prog_type, prog, prog_len, pflags, "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 4); + saved_errno = errno; if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) { printf("SKIP (unsupported program type %d)\n", prog_type); skips++; @@ -910,7 +912,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv, if (expected_ret == ACCEPT) { if (fd_prog < 0) { printf("FAIL\nFailed to load prog '%s'!\n", - strerror(errno)); + strerror(saved_errno)); goto fail_log; } #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS -- 2.20.1