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libbpf: Allow decimal offset for kprobes 

Allow to specify decimal offset in SEC macro, like:
  SEC("kprobe/bpf_fentry_test7+5")

Add selftest for that.

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Tested-by: Alan Maguire <alan.maguire@oracle.com>
Link: https://lore.kernel.org/bpf/20210721215810.889975-3-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2021-07-21 23:58:09 +02:00 committed by Andrii Nakryiko
parent 1f71a468a7
commit e3f9bc35ea
3 changed files with 14 additions and 1 deletions
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2
tools/lib/bpf/libbpf.c
View File

@ -10424,7 +10424,7 @@ static struct bpf_link *attach_kprobe(const struct bpf_sec_def *sec,
func_name = prog->sec_name + sec->len;
opts.retprobe = strcmp(sec->sec, "kretprobe/") == 0;
n = sscanf(func_name, "%m[a-zA-Z0-9_.]+%lx", &func, &offset);
n = sscanf(func_name, "%m[a-zA-Z0-9_.]+%li", &func, &offset);
if (n < 1) {
err = -EINVAL;
pr_warn("kprobe name is invalid: %s\n", func_name);

2
tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
View File

@ -17,6 +17,7 @@ void test_get_func_ip_test(void)
*/
#ifndef __x86_64__
bpf_program__set_autoload(skel->progs.test6, false);
bpf_program__set_autoload(skel->progs.test7, false);
#endif
err = get_func_ip_test__load(skel);
@ -46,6 +47,7 @@ void test_get_func_ip_test(void)
ASSERT_EQ(skel->bss->test5_result, 1, "test5_result");
#ifdef __x86_64__
ASSERT_EQ(skel->bss->test6_result, 1, "test6_result");
ASSERT_EQ(skel->bss->test7_result, 1, "test7_result");
#endif
cleanup:

11
tools/testing/selftests/bpf/progs/get_func_ip_test.c
View File

@ -11,6 +11,7 @@ extern const void bpf_fentry_test3 __ksym;
extern const void bpf_fentry_test4 __ksym;
extern const void bpf_modify_return_test __ksym;
extern const void bpf_fentry_test6 __ksym;
extern const void bpf_fentry_test7 __ksym;
__u64 test1_result = 0;
SEC("fentry/bpf_fentry_test1")
@ -71,3 +72,13 @@ int test6(struct pt_regs *ctx)
test6_result = (const void *) addr == &bpf_fentry_test6 + 5;
return 0;
}
__u64 test7_result = 0;
SEC("kprobe/bpf_fentry_test7+5")
int test7(struct pt_regs *ctx)
{
__u64 addr = bpf_get_func_ip(ctx);
test7_result = (const void *) addr == &bpf_fentry_test7 + 5;
return 0;
}