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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e4d9c23207
A handful of samples and selftests fail to build on s390, because
after commit 0ebeea8ca8 ("bpf: Restrict bpf_probe_read{, str}()
only to archs where they work") bpf_probe_read is not available
anymore.
Fix by using bpf_probe_read_kernel.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200720114806.88823-1-iii@linux.ibm.com
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/* Copyright (c) 2020 Facebook */
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_tracing.h>
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#include "pid_iter.h"
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/* keep in sync with the definition in main.h */
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enum bpf_obj_type {
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BPF_OBJ_UNKNOWN,
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BPF_OBJ_PROG,
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BPF_OBJ_MAP,
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BPF_OBJ_LINK,
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BPF_OBJ_BTF,
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};
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extern const void bpf_link_fops __ksym;
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extern const void bpf_map_fops __ksym;
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extern const void bpf_prog_fops __ksym;
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extern const void btf_fops __ksym;
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const volatile enum bpf_obj_type obj_type = BPF_OBJ_UNKNOWN;
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static __always_inline __u32 get_obj_id(void *ent, enum bpf_obj_type type)
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{
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switch (type) {
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case BPF_OBJ_PROG:
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return BPF_CORE_READ((struct bpf_prog *)ent, aux, id);
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case BPF_OBJ_MAP:
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return BPF_CORE_READ((struct bpf_map *)ent, id);
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case BPF_OBJ_BTF:
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return BPF_CORE_READ((struct btf *)ent, id);
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case BPF_OBJ_LINK:
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return BPF_CORE_READ((struct bpf_link *)ent, id);
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default:
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return 0;
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}
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}
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SEC("iter/task_file")
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int iter(struct bpf_iter__task_file *ctx)
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{
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struct file *file = ctx->file;
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struct task_struct *task = ctx->task;
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struct pid_iter_entry e;
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const void *fops;
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if (!file || !task)
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return 0;
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switch (obj_type) {
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case BPF_OBJ_PROG:
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fops = &bpf_prog_fops;
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break;
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case BPF_OBJ_MAP:
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fops = &bpf_map_fops;
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break;
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case BPF_OBJ_BTF:
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fops = &btf_fops;
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break;
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case BPF_OBJ_LINK:
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fops = &bpf_link_fops;
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break;
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default:
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return 0;
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}
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if (file->f_op != fops)
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return 0;
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e.pid = task->tgid;
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e.id = get_obj_id(file->private_data, obj_type);
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bpf_probe_read_kernel(&e.comm, sizeof(e.comm),
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task->group_leader->comm);
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bpf_seq_write(ctx->meta->seq, &e, sizeof(e));
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return 0;
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}
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char LICENSE[] SEC("license") = "Dual BSD/GPL";
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