mirror of
https://github.com/xdp-project/bpf-examples.git
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22 lines
463 B
C
22 lines
463 B
C
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// 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_trace_helpers.h>
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#include <errno.h>
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char _license[] SEC("license") = "GPL";
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int seen_pin = 0;
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SEC("lsm/bpf")
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int BPF_PROG(sys_bpf_hook, int cmd, union bpf_attr *attr, unsigned int size)
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{
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/* We need to allow a single pin action to pin ourselves after attach */
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if (cmd == BPF_OBJ_PIN && !seen_pin) {
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seen_pin = 1;
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return 0;
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}
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return -EACCES;
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}
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