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author | Andrii Nakryiko <andriin@fb.com> | 2019-08-07 14:40:01 -0700 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2019-08-07 14:43:49 -0700 |
commit | 29e1c66872450adba0ad552ff6019932168676f3 (patch) | |
tree | d8e0e5c5cd477ddf1ca0af0717623f1f19488972 /tools/testing/selftests/bpf/progs/test_core_reloc_misc.c | |
parent | selftests/bpf: add CO-RE relocs ints tests (diff) | |
download | linux-dev-29e1c66872450adba0ad552ff6019932168676f3.tar.xz linux-dev-29e1c66872450adba0ad552ff6019932168676f3.zip |
selftests/bpf: add CO-RE relocs misc tests
Add tests validating few edge-cases of capturing offset relocations.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_core_reloc_misc.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_core_reloc_misc.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_core_reloc_misc.c b/tools/testing/selftests/bpf/progs/test_core_reloc_misc.c new file mode 100644 index 000000000000..c59984bd3e23 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_misc.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include <linux/bpf.h> +#include <stdint.h> +#include "bpf_helpers.h" + +char _license[] SEC("license") = "GPL"; + +static volatile struct data { + char in[256]; + char out[256]; +} data; + +struct core_reloc_misc_output { + int a, b, c; +}; + +struct core_reloc_misc___a { + int a1; + int a2; +}; + +struct core_reloc_misc___b { + int b1; + int b2; +}; + +/* fixed two first members, can be extended with new fields */ +struct core_reloc_misc_extensible { + int a; + int b; +}; + +SEC("raw_tracepoint/sys_enter") +int test_core_misc(void *ctx) +{ + struct core_reloc_misc___a *in_a = (void *)&data.in; + struct core_reloc_misc___b *in_b = (void *)&data.in; + struct core_reloc_misc_extensible *in_ext = (void *)&data.in; + struct core_reloc_misc_output *out = (void *)&data.out; + + /* record two different relocations with the same accessor string */ + if (BPF_CORE_READ(&out->a, &in_a->a1) || /* accessor: 0:0 */ + BPF_CORE_READ(&out->b, &in_b->b1)) /* accessor: 0:0 */ + return 1; + + /* Validate relocations capture array-only accesses for structs with + * fixed header, but with potentially extendable tail. This will read + * first 4 bytes of 2nd element of in_ext array of potentially + * variably sized struct core_reloc_misc_extensible. */ + if (BPF_CORE_READ(&out->c, &in_ext[2])) /* accessor: 2 */ + return 1; + + return 0; +} + |