a3a5113393
Adding kprobe session test that verifies the cookie value get properly propagated from entry to return program. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20240430112830.1184228-8-jolsa@kernel.org
58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include <stdbool.h>
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#include "bpf_kfuncs.h"
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char _license[] SEC("license") = "GPL";
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int pid = 0;
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__u64 test_kprobe_1_result = 0;
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__u64 test_kprobe_2_result = 0;
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__u64 test_kprobe_3_result = 0;
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/*
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* No tests in here, just to trigger 'bpf_fentry_test*'
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* through tracing test_run
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*/
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SEC("fentry/bpf_modify_return_test")
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int BPF_PROG(trigger)
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{
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return 0;
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}
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static int check_cookie(__u64 val, __u64 *result)
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{
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long *cookie;
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if (bpf_get_current_pid_tgid() >> 32 != pid)
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return 1;
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cookie = bpf_session_cookie();
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if (bpf_session_is_return())
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*result = *cookie == val ? val : 0;
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else
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*cookie = val;
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return 0;
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}
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SEC("kprobe.session/bpf_fentry_test1")
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int test_kprobe_1(struct pt_regs *ctx)
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{
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return check_cookie(1, &test_kprobe_1_result);
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}
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SEC("kprobe.session/bpf_fentry_test1")
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int test_kprobe_2(struct pt_regs *ctx)
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{
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return check_cookie(2, &test_kprobe_2_result);
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}
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SEC("kprobe.session/bpf_fentry_test1")
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int test_kprobe_3(struct pt_regs *ctx)
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{
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return check_cookie(3, &test_kprobe_3_result);
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}
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