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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2020 Google LLC.
*/
#include "vmlinux.h"
#include <errno.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
u32 monitored_pid = 0;
struct {
__uint(type, BPF_MAP_TYPE_RINGBUF);
__uint(max_entries, 1 << 12);
} ringbuf SEC(".maps");
char _license[] SEC("license") = "GPL";
SEC("lsm.s/bprm_committed_creds")
void BPF_PROG(ima, struct linux_binprm *bprm)
{
u64 ima_hash = 0;
u64 *sample;
int ret;
u32 pid;
pid = bpf_get_current_pid_tgid() >> 32;
if (pid == monitored_pid) {
ret = bpf_ima_inode_hash(bprm->file->f_inode, &ima_hash,
sizeof(ima_hash));
if (ret < 0 || ima_hash == 0)
return;
sample = bpf_ringbuf_reserve(&ringbuf, sizeof(u64), 0);
if (!sample)
return;
*sample = ima_hash;
bpf_ringbuf_submit(sample, 0);
}
return;
}
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