netdev - [PATCH bpf-next 2/6] selftests/bpf: make CO-RE reloc test impartial to test

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Date:   Tue, 15 Oct 2019 15:03:48 -0700
From:   Andrii Nakryiko <andriin@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>,
        Andrii Nakryiko <andriin@...com>
Subject: [PATCH bpf-next 2/6] selftests/bpf: make CO-RE reloc test impartial to test_progs flavor

test_core_reloc_kernel test captures its own process name and validates
it as part of the test. Given extra "flavors" of test_progs, this break
for anything by default test_progs binary. Fix the test to cut out
flavor part of the process name.

Fixes: ee2eb063d330 ("selftests/bpf: Add BPF_CORE_READ and BPF_CORE_READ_STR_INTO macro tests")
Signed-off-by: Andrii Nakryiko <andriin@...com>
---
 tools/testing/selftests/bpf/prog_tests/core_reloc.c        | 4 ++--
 tools/testing/selftests/bpf/progs/core_reloc_types.h       | 2 +-
 tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c | 3 ++-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/core_reloc.c b/tools/testing/selftests/bpf/prog_tests/core_reloc.c
index 21a0dff66241..17980189d9e5 100644
--- a/tools/testing/selftests/bpf/prog_tests/core_reloc.c
+++ b/tools/testing/selftests/bpf/prog_tests/core_reloc.c
@@ -195,8 +195,8 @@ static struct core_reloc_test_case test_cases[] = {
 		.input_len = 0,
 		.output = STRUCT_TO_CHAR_PTR(core_reloc_kernel_output) {
 			.valid = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, },
-			.comm = "test_progs\0\0\0\0\0",
-			.comm_len = 11,
+			.comm = "test_progs",
+			.comm_len = sizeof("test_progs"),
 		},
 		.output_len = sizeof(struct core_reloc_kernel_output),
 	},
diff --git a/tools/testing/selftests/bpf/progs/core_reloc_types.h b/tools/testing/selftests/bpf/progs/core_reloc_types.h
index 9a6bdeb4894c..f4f16c30c60c 100644
--- a/tools/testing/selftests/bpf/progs/core_reloc_types.h
+++ b/tools/testing/selftests/bpf/progs/core_reloc_types.h
@@ -6,7 +6,7 @@
 
 struct core_reloc_kernel_output {
 	int valid[10];
-	char comm[16];
+	char comm[sizeof("test_progs")];
 	int comm_len;
 };
 
diff --git a/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c b/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c
index 50f609618b65..a4b5e0562ed5 100644
--- a/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c
+++ b/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c
@@ -15,7 +15,8 @@ static volatile struct data {
 
 struct core_reloc_kernel_output {
 	int valid[10];
-	char comm[16];
+	/* we have test_progs[-flavor], so cut flavor part */
+	char comm[sizeof("test_progs")];
 	int comm_len;
 };
 
-- 
2.17.1