38 lines
850 B
C
38 lines
850 B
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
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#include "bpf_iter.h"
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#include <bpf/bpf_helpers.h>
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char _license[] SEC("license") = "GPL";
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__u32 unique_tgid_cnt = 0;
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uintptr_t address = 0;
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uintptr_t offset = 0;
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__u32 last_tgid = 0;
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__u32 pid = 0;
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__u32 page_shift = 0;
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SEC("iter/task_vma")
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int get_vma_offset(struct bpf_iter__task_vma *ctx)
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{
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struct vm_area_struct *vma = ctx->vma;
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struct seq_file *seq = ctx->meta->seq;
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struct task_struct *task = ctx->task;
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if (task == NULL || vma == NULL)
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return 0;
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if (last_tgid != task->tgid)
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unique_tgid_cnt++;
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last_tgid = task->tgid;
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if (task->tgid != pid)
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return 0;
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if (vma->vm_start <= address && vma->vm_end > address) {
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offset = address - vma->vm_start + (vma->vm_pgoff << page_shift);
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BPF_SEQ_PRINTF(seq, "OK\n");
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}
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return 0;
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}
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