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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <stdbool.h>
#include "bpf_kfuncs.h"
#define ARRAY_SIZE(x) (int)(sizeof(x) / sizeof((x)[0]))
char _license[] SEC("license") = "GPL";
extern const void bpf_fentry_test1 __ksym;
extern const void bpf_fentry_test2 __ksym;
extern const void bpf_fentry_test3 __ksym;
extern const void bpf_fentry_test4 __ksym;
extern const void bpf_fentry_test5 __ksym;
extern const void bpf_fentry_test6 __ksym;
extern const void bpf_fentry_test7 __ksym;
extern const void bpf_fentry_test8 __ksym;
int pid = 0;
__u64 kprobe_session_result[8];
static int session_check(void *ctx)
{
unsigned int i;
__u64 addr;
const void *kfuncs[] = {
&bpf_fentry_test1,
&bpf_fentry_test2,
&bpf_fentry_test3,
&bpf_fentry_test4,
&bpf_fentry_test5,
&bpf_fentry_test6,
&bpf_fentry_test7,
&bpf_fentry_test8,
};
if (bpf_get_current_pid_tgid() >> 32 != pid)
return 1;
addr = bpf_get_func_ip(ctx);
for (i = 0; i < ARRAY_SIZE(kfuncs); i++) {
if (kfuncs[i] == (void *) addr) {
kprobe_session_result[i]++;
break;
}
}
/*
* Force probes for function bpf_fentry_test[5-8] not to
* install and execute the return probe
*/
if (((const void *) addr == &bpf_fentry_test5) ||
((const void *) addr == &bpf_fentry_test6) ||
((const void *) addr == &bpf_fentry_test7) ||
((const void *) addr == &bpf_fentry_test8))
return 1;
return 0;
}
/*
* No tests in here, just to trigger 'bpf_fentry_test*'
* through tracing test_run
*/
SEC("fentry/bpf_modify_return_test")
int BPF_PROG(trigger)
{
return 0;
}
SEC("kprobe.session/bpf_fentry_test*")
int test_kprobe(struct pt_regs *ctx)
{
return session_check(ctx);
}
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