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c93cbdb13f
Because the kfuncs are going through LSM hooks, allowing their use via workqueue callbacks would expose the wrong credentials. This test ensures the kfunc are preventing any use from these contexts. Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Stanislav Fomichev <sdf@fomichev.me> Acked-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/bpf/20260813110540.103550-6-mahe.tardy@gmail.com
63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2026 Isovalent */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include "bpf_experimental.h"
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#include "bpf_tracing_net.h"
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#include "errno.h"
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#include "ksock_common.h"
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struct ksock_wq_value {
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struct bpf_wq work;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, u32);
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__type(value, struct ksock_wq_value);
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} work_map SEC(".maps");
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int create_err;
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u32 callback_done;
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static int ksock_wq_callback(void *map, int *key, void *value)
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{
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struct bpf_ksock_create_opts opts = {
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.family = AF_INET,
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.type = SOCK_DGRAM,
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.protocol = IPPROTO_UDP,
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};
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struct bpf_ksock *ks;
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int err = 0;
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ks = bpf_ksock_create(&opts, sizeof(opts), &err);
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if (ks)
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bpf_ksock_release(ks);
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create_err = err;
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__sync_fetch_and_add(&callback_done, 1);
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return 0;
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}
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SEC("syscall")
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int ksock_wq_start(void *ctx)
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{
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struct ksock_wq_value *value;
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u32 key = 0;
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int err;
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value = bpf_map_lookup_elem(&work_map, &key);
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if (!value)
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return -ENOENT;
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err = bpf_wq_init(&value->work, &work_map, 0);
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if (err)
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return err;
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err = bpf_wq_set_callback(&value->work, ksock_wq_callback, 0);
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if (err)
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return err;
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return bpf_wq_start(&value->work, 0);
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}
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char __license[] SEC("license") = "GPL";
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