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[108.214.96.168]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-67bb331eee0sm3877789eaf.8.2026.03.10.03.21.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Mar 2026 03:22:02 -0700 (PDT) From: Sun Jian To: Andrii Nakryiko , Eduard Zingerman , Shuah Khan Cc: bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , Sun Jian Subject: [PATCH 1/2] selftests/bpf: Fix read_iter buffer termination in test_bpffs Date: Tue, 10 Mar 2026 18:21:44 +0800 Message-ID: <20260310102145.857810-1-sun.jian.kdev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit read_iter() always NUL-terminated at the end of the buffer, so strstr() could scan uninitialized stack bytes on short reads. Terminate at len and use O_RDONLY. Signed-off-by: Sun Jian --- tools/testing/selftests/bpf/prog_tests/test_bpffs.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/test_bpffs.c b/tools/testing/selftests/bpf/prog_tests/test_bpffs.c index ea933fd151c3..e8021ff0581c 100644 --- a/tools/testing/selftests/bpf/prog_tests/test_bpffs.c +++ b/tools/testing/selftests/bpf/prog_tests/test_bpffs.c @@ -17,11 +17,11 @@ static int read_iter(char *file) char buf[1024]; int fd, len; - fd = open(file, 0); + fd = open(file, O_RDONLY); if (fd < 0) return -1; - while ((len = read(fd, buf, sizeof(buf))) > 0) { - buf[sizeof(buf) - 1] = '\0'; + while ((len = read(fd, buf, sizeof(buf) - 1)) > 0) { + buf[len] = '\0'; if (strstr(buf, "iter")) { close(fd); return 0; base-commit: 1f318b96cc84d7c2ab792fcc0bfd42a7ca890681 -- 2.43.0