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([2620:10d:c092:500::6:66e8]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-437969fd36dsm45197117f8f.0.2026.02.18.08.44.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Feb 2026 08:44:36 -0800 (PST) Message-ID: <31abfaef-f536-4778-8aa1-767fcc3da48b@gmail.com> Date: Wed, 18 Feb 2026 16:44:36 +0000 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf v2 14/15] selftests/bpf: Check BPFTOOL env var in detect_bpftool_path() To: Ihor Solodrai , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Jiri Olsa , Mykyta Yatsenko , =?UTF-8?Q?Alexis_Lothor=C3=A9?= Cc: Amery Hung , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com References: <20260218003041.1156774-1-ihor.solodrai@linux.dev> <20260218003041.1156774-15-ihor.solodrai@linux.dev> Content-Language: en-US From: Mykyta Yatsenko In-Reply-To: <20260218003041.1156774-15-ihor.solodrai@linux.dev> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/18/26 00:30, Ihor Solodrai wrote: > The bpftool_maps_access and bpftool_metadata tests may fail on BPF CI > with "command not found", depending on a workflow. > This happens because detect_bpftool_path() only checks two hardcoded > relative paths: > - ./tools/sbin/bpftool > - ../tools/sbin/bpftool > > Add support for a BPFTOOL environment variable that allows specifying > the exact path to the bpftool binary. > > Also replace strncpy() with snprintf() for proper null-termination. > > Signed-off-by: Ihor Solodrai Acked-by: Mykyta Yatsenko > --- > tools/testing/selftests/bpf/bpftool_helpers.c | 19 +++++++++++++++---- > 1 file changed, 15 insertions(+), 4 deletions(-) > > diff --git a/tools/testing/selftests/bpf/bpftool_helpers.c b/tools/testing/selftests/bpf/bpftool_helpers.c > index a5824945a4a5..d810e73da6c8 100644 > --- a/tools/testing/selftests/bpf/bpftool_helpers.c > +++ b/tools/testing/selftests/bpf/bpftool_helpers.c > @@ -1,5 +1,6 @@ > // SPDX-License-Identifier: GPL-2.0-only > #include "bpftool_helpers.h" > +#include > #include > #include > #include > @@ -12,13 +13,24 @@ > static int detect_bpftool_path(char *buffer) > { > char tmp[BPFTOOL_PATH_MAX_LEN]; > + const char *env_path; > + > + /* First, check if BPFTOOL environment variable is set */ > + env_path = getenv("BPFTOOL"); > + if (env_path && access(env_path, X_OK) == 0) { > + snprintf(buffer, BPFTOOL_PATH_MAX_LEN, "%s", env_path); > + return 0; > + } else if (env_path) { > + fprintf(stderr, "bpftool '%s' doesn't exist or is not executable\n", env_path); > + return 1; > + } > > /* Check default bpftool location (will work if we are running the > * default flavor of test_progs) > */ > snprintf(tmp, BPFTOOL_PATH_MAX_LEN, "./%s", BPFTOOL_DEFAULT_PATH); > if (access(tmp, X_OK) == 0) { > - strncpy(buffer, tmp, BPFTOOL_PATH_MAX_LEN); > + snprintf(buffer, BPFTOOL_PATH_MAX_LEN, "%s", tmp); > return 0; > } > > @@ -27,11 +39,11 @@ static int detect_bpftool_path(char *buffer) > */ > snprintf(tmp, BPFTOOL_PATH_MAX_LEN, "../%s", BPFTOOL_DEFAULT_PATH); > if (access(tmp, X_OK) == 0) { > - strncpy(buffer, tmp, BPFTOOL_PATH_MAX_LEN); > + snprintf(buffer, BPFTOOL_PATH_MAX_LEN, "%s", tmp); > return 0; > } > > - /* Failed to find bpftool binary */ > + fprintf(stderr, "Failed to detect bpftool path, use BPFTOOL env var to override\n"); > return 1; > } > > @@ -71,4 +83,3 @@ int get_bpftool_command_output(char *args, char *output_buf, size_t output_max_l > { > return run_command(args, output_buf, output_max_len); > } > -