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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2020 Google LLC.
*/
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <errno.h>
char _license[] SEC("license") = "GPL";
int monitored_pid = 0;
int mprotect_count = 0;
int bprm_count = 0;
SEC("lsm/file_mprotect")
int BPF_PROG(test_int_hook, struct vm_area_struct *vma,
unsigned long reqprot, unsigned long prot, int ret)
{
if (ret != 0)
return ret;
__u32 pid = bpf_get_current_pid_tgid() >> 32;
int is_stack = 0;
is_stack = (vma->vm_start <= vma->vm_mm->start_stack &&
vma->vm_end >= vma->vm_mm->start_stack);
if (is_stack && monitored_pid == pid) {
mprotect_count++;
ret = -EPERM;
}
return ret;
}
SEC("lsm/bprm_committed_creds")
int BPF_PROG(test_void_hook, struct linux_binprm *bprm)
{
__u32 pid = bpf_get_current_pid_tgid() >> 32;
if (monitored_pid == pid)
bprm_count++;
return 0;
}
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