bpf samples: update tracex5 sample to use __seccomp_filter

seccomp_phase1() does not exist anymore. Instead, update sample to use
__seccomp_filter(). While at it, set max locked memory to unlimited.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

samples/bpf/tracex5_kern.c

@@ -19,20 +19,18 @@ struct bpf_map_def SEC("maps") progs = {
 	.max_entries = 1024,
 };
 
-SEC("kprobe/seccomp_phase1")
+SEC("kprobe/__seccomp_filter")
 int bpf_prog1(struct pt_regs *ctx)
 {
-	struct seccomp_data sd;
-
-	bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM1(ctx));
+	int sc_nr = (int)PT_REGS_PARM1(ctx);
 
 	/* dispatch into next BPF program depending on syscall number */
-	bpf_tail_call(ctx, &progs, sd.nr);
+	bpf_tail_call(ctx, &progs, sc_nr);
 
 	/* fall through -> unknown syscall */
-	if (sd.nr >= __NR_getuid && sd.nr <= __NR_getsid) {
+	if (sc_nr >= __NR_getuid && sc_nr <= __NR_getsid) {
 		char fmt[] = "syscall=%d (one of get/set uid/pid/gid)\n";
-		bpf_trace_printk(fmt, sizeof(fmt), sd.nr);
+		bpf_trace_printk(fmt, sizeof(fmt), sc_nr);
 	}
 	return 0;
 }
@@ -42,7 +40,7 @@ PROG(__NR_write)(struct pt_regs *ctx)
 {
 	struct seccomp_data sd;
 
-	bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM1(ctx));
+	bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
 	if (sd.args[2] == 512) {
 		char fmt[] = "write(fd=%d, buf=%p, size=%d)\n";
 		bpf_trace_printk(fmt, sizeof(fmt),
@@ -55,7 +53,7 @@ PROG(__NR_read)(struct pt_regs *ctx)
 {
 	struct seccomp_data sd;
 
-	bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM1(ctx));
+	bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
 	if (sd.args[2] > 128 && sd.args[2] <= 1024) {
 		char fmt[] = "read(fd=%d, buf=%p, size=%d)\n";
 		bpf_trace_printk(fmt, sizeof(fmt),