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[192.26.29.3]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c249672becesm919972466b.42.2026.08.23.12.32.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Aug 2026 12:32:06 -0700 (PDT) From: Kumar Kartikeya Dwivedi To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Emil Tsalapatis , kkd@meta.com, kernel-team@meta.com Subject: [PATCH bpf-next v1 2/2] selftests/bpf: Cover oversized stream read buffers Date: Sun, 23 Aug 2026 21:32:01 +0200 Message-ID: <20260823193202.2389715-3-memxor@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260823193202.2389715-1-memxor@gmail.com> References: <20260823193202.2389715-1-memxor@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1147; i=memxor@gmail.com; h=from:subject; bh=S/QF7/xcPW88oPsqR+fzOSq+0AZcH4QZuHxfczkAWdU=; b=owGbwMvMwCXmrmtenRyi38x4Wi2JIavba/6hIw/qD7KXSWzsCFt27dfekx8v+goIfT0u8WnOo bCdpj3zOkpZGMS4GGTFFFlK/u9jMj5R+TvQdhk3zBxWJpAhDFycAjCRkgaG/2n3N33ts9y4099g pfTGmjNHq/i6a86tL3Ps37JA7OgUx2xGhr4q5a0my4p5nHb7Bb9PW6ahLfzjdhk/39oHUXkKQMc xAQA= X-Developer-Key: i=memxor@gmail.com; a=openpgp; fpr=B34BD741DE8494B76E2F717880EF20021D46C59B Content-Transfer-Encoding: 8bit Exercise BPF_PROG_STREAM_READ_BY_FD with a UINT_MAX buffer length and require EINVAL. Continue with the existing two-part read of the queued payload to verify that rejecting the oversized request does not consume or otherwise disturb stream data. Signed-off-by: Kumar Kartikeya Dwivedi --- tools/testing/selftests/bpf/prog_tests/stream.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/stream.c b/tools/testing/selftests/bpf/prog_tests/stream.c index 4d8054a23cc7..74bd15c4bfba 100644 --- a/tools/testing/selftests/bpf/prog_tests/stream.c +++ b/tools/testing/selftests/bpf/prog_tests/stream.c @@ -46,6 +46,10 @@ void test_stream_syscall(void) ret = -errno; ASSERT_EQ(ret, -EFAULT, "bad stream buf"); + ASSERT_LT(bpf_prog_stream_read(prog_fd, BPF_STREAM_STDOUT, buf, UINT_MAX, NULL), 0, "error"); + ret = -errno; + ASSERT_EQ(ret, -EINVAL, "large stream buf"); + ret = bpf_prog_stream_read(prog_fd, BPF_STREAM_STDOUT, buf, 2, NULL); ASSERT_EQ(ret, 2, "bytes"); ret = bpf_prog_stream_read(prog_fd, BPF_STREAM_STDOUT, buf, 2, NULL); -- 2.53.0