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38 lines
806 B
C
38 lines
806 B
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_kfuncs.h"
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char _license[] SEC("license") = "GPL";
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__u32 monitored_pid;
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__u32 found_xattr;
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static const char expected_value[] = "hello";
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char value[32];
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SEC("lsm.s/file_open")
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int BPF_PROG(test_file_open, struct file *f)
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{
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struct bpf_dynptr value_ptr;
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__u32 pid;
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int ret;
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pid = bpf_get_current_pid_tgid() >> 32;
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if (pid != monitored_pid)
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return 0;
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bpf_dynptr_from_mem(value, sizeof(value), 0, &value_ptr);
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ret = bpf_get_file_xattr(f, "user.kfuncs", &value_ptr);
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if (ret != sizeof(expected_value))
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return 0;
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if (bpf_strncmp(value, ret, expected_value))
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return 0;
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found_xattr = 1;
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return 0;
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}
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