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selftests/bpf: Convert test printk to use rodata.

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Convert test trace_printk to more aggressively validate and use rodata.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-21-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2021-05-13 17:36:22 -07:00 committed by Daniel Borkmann
parent 0a93066299
commit eb0f1e0c7f
2 changed files with 6 additions and 3 deletions
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3
tools/testing/selftests/bpf/prog_tests/trace_printk.c
View file

@ -21,6 +21,9 @@ void test_trace_printk(void)
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
return;
ASSERT_EQ(skel->rodata->fmt[0], 'T', "invalid printk fmt string");
skel->rodata->fmt[0] = 't';
err = trace_printk__load(skel);
if (CHECK(err, "skel_load", "failed to load skeleton: %d\n", err))
goto cleanup;

6
tools/testing/selftests/bpf/progs/trace_printk.c
View file

@ -10,11 +10,11 @@ char _license[] SEC("license") = "GPL";
int trace_printk_ret = 0;
int trace_printk_ran = 0;
SEC("tp/raw_syscalls/sys_enter")
const char fmt[] = "Testing,testing %d\n";
SEC("fentry/__x64_sys_nanosleep")
int sys_enter(void *ctx)
{
static const char fmt[] = "testing,testing %d\n";
trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt),
++trace_printk_ran);
return 0;