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selftests/exec: share the bpf handler preconditions

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The bpf handler fixture opens with three probes, each with its own SKIP.
More fixtures with the same needs are about to be added, so hoist the
probes into a helper that reports the first missing precondition.

Link: https://patch.msgid.link/20260730-work-binfmt_misc-preopen-v1-5-4a0b0da71f16@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-07-31 10:38:23 +02:00
parent c2ae276e69
commit 23ee398499
1 changed files with 27 additions and 16 deletions
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tools/testing/selftests/exec/binfmt_misc_bpf.c
+27 -16
View File
@@ -106,6 +106,30 @@ static int check_output(const char *cmd, const char *expected)
return strncmp(buf, expected, strlen(expected)) ? -1 : 0;
}
/* Does the kernel BTF know struct binfmt_misc_ops (CONFIG_BINFMT_MISC_BPF)? */
static bool have_binfmt_misc_ops(void)
{
struct btf *btf = btf__load_vmlinux_btf();
bool have;
have = btf && btf__find_by_name_kind(btf, "binfmt_misc_ops",
BTF_KIND_STRUCT) >= 0;
btf__free(btf);
return have;
}
/* The reason bpf handler cases cannot run here, NULL if they can. */
static const char *bpf_handler_unsupported(void)
{
if (getuid() != 0)
return "test must be run as root";
if (!have_binfmt_misc_ops())
return "no struct binfmt_misc_ops in the kernel BTF (CONFIG_BINFMT_MISC_BPF)";
if (!binfmt_misc_available())
return "no binfmt_misc";
return NULL;
}
/* An attached handler with its 'B' entry activated. */
struct bpf_case {
struct bpf_object *obj;
@@ -190,23 +214,10 @@ FIXTURE(bpf_handler) {
FIXTURE_SETUP(bpf_handler)
{
char src[PATH_MAX];
struct btf *btf;
const char *why = bpf_handler_unsupported();
if (getuid() != 0)
SKIP(return, "test must be run as root");
/* The kernel must know struct binfmt_misc_ops (CONFIG_BINFMT_MISC_BPF). */
btf = btf__load_vmlinux_btf();
if (!btf || btf__find_by_name_kind(btf, "binfmt_misc_ops",
BTF_KIND_STRUCT) < 0) {
btf__free(btf);
SKIP(return,
"no struct binfmt_misc_ops in the kernel BTF (CONFIG_BINFMT_MISC_BPF)");
}
btf__free(btf);
if (!binfmt_misc_available())
SKIP(return, "no binfmt_misc");
if (why)
SKIP(return, "%s", why);
/* Shared test interpreter. */
ASSERT_EQ(artifact_path(src, sizeof(src), "binfmt_bpf_interp"), 0);