diff options
| author | Andrii Nakryiko <andriin@fb.com> | 2019-12-13 17:47:10 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-12-15 16:41:12 -0800 |
| commit | 330a73a7b6ca93a415de1b7da68d7a0698fe4937 (patch) | |
| tree | 7f0220e2dd38b8f7c99c9b4780c97cd6513be982 /tools/testing/selftests/bpf/progs/test_skeleton.c | |
| parent | 2ad97d473db57ab866f0756806bb94515f7f2551 (diff) | |
selftests/bpf: Add tests for libbpf-provided externs
Add a set of tests validating libbpf-provided extern variables. One crucial
feature that's tested is dead code elimination together with using invalid BPF
helper. CONFIG_MISSING is not supposed to exist and should always be specified
by libbpf as zero, which allows BPF verifier to correctly do branch pruning
and not fail validation, when invalid BPF helper is called from dead if branch.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191214014710.3449601-5-andriin@fb.com
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_skeleton.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_skeleton.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_skeleton.c b/tools/testing/selftests/bpf/progs/test_skeleton.c index c0013d2e16f2..9caa44758ea2 100644 --- a/tools/testing/selftests/bpf/progs/test_skeleton.c +++ b/tools/testing/selftests/bpf/progs/test_skeleton.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2019 Facebook */ +#include <stdbool.h> #include <linux/bpf.h> #include "bpf_helpers.h" @@ -20,6 +21,10 @@ char out3 = 0; long long out4 = 0; int out1 = 0; +extern bool CONFIG_BPF_SYSCALL; +extern int LINUX_KERNEL_VERSION; +bool bpf_syscall = 0; +int kern_ver = 0; SEC("raw_tp/sys_enter") int handler(const void *ctx) @@ -31,6 +36,10 @@ int handler(const void *ctx) out3 = in3; out4 = in4; out5 = in5; + + bpf_syscall = CONFIG_BPF_SYSCALL; + kern_ver = LINUX_KERNEL_VERSION; + return 0; } |