85981e0f9e
Adding selftest that puts kprobe on bpf_fentry_test1 that calls bpf_printk and invokes bpf_trace_printk tracepoint. The bpf_trace_printk tracepoint has test[234] programs attached to it. Because kprobe execution goes through bpf_prog_active check, programs attached to the tracepoint will fail the recursion check and increment the recursion_misses stats. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Tested-by: Song Liu <song@kernel.org> Reviewed-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/bpf/20230920213145.1941596-10-jolsa@kernel.org
41 lines
673 B
C
41 lines
673 B
C
// SPDX-License-Identifier: GPL-2.0
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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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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SEC("kprobe/bpf_fentry_test1")
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int test1(struct pt_regs *ctx)
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{
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bpf_printk("test");
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return 0;
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}
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SEC("tp/bpf_trace/bpf_trace_printk")
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int test2(struct pt_regs *ctx)
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{
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return 0;
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}
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SEC("tp/bpf_trace/bpf_trace_printk")
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int test3(struct pt_regs *ctx)
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{
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return 0;
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}
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SEC("tp/bpf_trace/bpf_trace_printk")
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int test4(struct pt_regs *ctx)
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{
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return 0;
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}
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