// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <linux/bpf.h>
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#include <unistd.h>
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#include <linux/filter.h>
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#include <linux/seccomp.h>
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#include <sys/prctl.h>
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#include <bpf/bpf.h>
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#include "bpf_load.h"
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#include <sys/resource.h>
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/* install fake seccomp program to enable seccomp code path inside the kernel,
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* so that our kprobe attached to seccomp_phase1() can be triggered
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*/
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static void install_accept_all_seccomp(void)
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{
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struct sock_filter filter[] = {
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
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};
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struct sock_fprog prog = {
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.len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
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.filter = filter,
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};
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if (prctl(PR_SET_SECCOMP, 2, &prog))
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perror("prctl");
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}
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int main(int ac, char **argv)
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{
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FILE *f;
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char filename[256];
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struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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setrlimit(RLIMIT_MEMLOCK, &r);
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if (load_bpf_file(filename)) {
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printf("%s", bpf_log_buf);
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return 1;
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}
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install_accept_all_seccomp();
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f = popen("dd if=/dev/zero of=/dev/null count=5", "r");
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(void) f;
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read_trace_pipe();
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return 0;
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}
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