| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */ |
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| 3 | |
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| 4 | #include "vmlinux.h" |
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| 5 | #include "bpf_experimental.h" |
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| 6 | #include <bpf/bpf_helpers.h> |
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| 7 | #include "bpf_misc.h" |
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| 8 | |
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| 9 | pid_t target_pid = 0; |
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| 10 | unsigned int vmas_seen = 0; |
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| 11 | |
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| 12 | struct { |
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| 13 | __u64 vm_start; |
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| 14 | __u64 vm_end; |
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| 15 | } vm_ranges[1000]; |
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| 16 | |
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| 17 | SEC("raw_tp/sys_enter" ) |
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| 18 | int iter_task_vma_for_each(const void *ctx) |
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| 19 | { |
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| 20 | struct task_struct *task = bpf_get_current_task_btf(); |
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| 21 | struct vm_area_struct *vma; |
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| 22 | unsigned int seen = 0; |
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| 23 | |
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| 24 | if (task->pid != target_pid) |
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| 25 | return 0; |
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| 26 | |
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| 27 | if (vmas_seen) |
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| 28 | return 0; |
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| 29 | |
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| 30 | bpf_for_each(task_vma, vma, task, 0) { |
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| 31 | if (bpf_cmp_unlikely(seen, >=, 1000)) |
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| 32 | break; |
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| 33 | |
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| 34 | vm_ranges[seen].vm_start = vma->vm_start; |
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| 35 | vm_ranges[seen].vm_end = vma->vm_end; |
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| 36 | seen++; |
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| 37 | } |
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| 38 | |
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| 39 | vmas_seen = seen; |
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| 40 | return 0; |
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| 41 | } |
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| 42 | |
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| 43 | char _license[] SEC("license" ) = "GPL" ; |
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| 44 | |
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