73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2021 Google LLC
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#include <linux/filter.h>
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#include <linux/fuse.h>
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static const struct bpf_func_proto *
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fuse_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
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{
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switch (func_id) {
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case BPF_FUNC_trace_printk:
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return bpf_get_trace_printk_proto();
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case BPF_FUNC_get_current_uid_gid:
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return &bpf_get_current_uid_gid_proto;
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case BPF_FUNC_get_current_pid_tgid:
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return &bpf_get_current_pid_tgid_proto;
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case BPF_FUNC_map_lookup_elem:
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return &bpf_map_lookup_elem_proto;
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case BPF_FUNC_map_update_elem:
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return &bpf_map_update_elem_proto;
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default:
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pr_debug("Invalid fuse bpf func %d\n", func_id);
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return NULL;
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}
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}
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static bool fuse_prog_is_valid_access(int off, int size,
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enum bpf_access_type type,
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const struct bpf_prog *prog,
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struct bpf_insn_access_aux *info)
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{
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int i;
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if (off < 0 || off > offsetofend(struct fuse_bpf_args, out_args))
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return false;
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/* TODO This is garbage. Do it properly */
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for (i = 0; i < 5; i++) {
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if (off == offsetof(struct fuse_bpf_args, in_args[i].value)) {
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info->reg_type = PTR_TO_RDONLY_BUF;
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info->ctx_field_size = 256;
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if (type != BPF_READ)
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return false;
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return true;
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}
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}
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for (i = 0; i < 3; i++) {
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if (off == offsetof(struct fuse_bpf_args, out_args[i].value)) {
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info->reg_type = PTR_TO_RDWR_BUF;
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info->ctx_field_size = 256;
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return true;
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}
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}
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if (type != BPF_READ)
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return false;
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return true;
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}
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const struct bpf_verifier_ops fuse_verifier_ops = {
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.get_func_proto = fuse_prog_func_proto,
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.is_valid_access = fuse_prog_is_valid_access,
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};
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const struct bpf_prog_ops fuse_prog_ops = {
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};
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