| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* Copyright (c) 2022 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/bpf_helpers.h> |
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| 6 | #include <bpf/usdt.bpf.h> |
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| 7 | |
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| 8 | int urand_pid; |
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| 9 | |
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| 10 | int urand_read_without_sema_call_cnt; |
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| 11 | int urand_read_without_sema_buf_sz_sum; |
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| 12 | |
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| 13 | SEC("usdt/./urandom_read:urand:read_without_sema" ) |
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| 14 | int BPF_USDT(urand_read_without_sema, int iter_num, int iter_cnt, int buf_sz) |
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| 15 | { |
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| 16 | if (urand_pid != (bpf_get_current_pid_tgid() >> 32)) |
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| 17 | return 0; |
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| 18 | |
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| 19 | __sync_fetch_and_add(&urand_read_without_sema_call_cnt, 1); |
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| 20 | __sync_fetch_and_add(&urand_read_without_sema_buf_sz_sum, buf_sz); |
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| 21 | |
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| 22 | return 0; |
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| 23 | } |
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| 24 | |
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| 25 | int urand_read_with_sema_call_cnt; |
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| 26 | int urand_read_with_sema_buf_sz_sum; |
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| 27 | |
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| 28 | SEC("usdt/./urandom_read:urand:read_with_sema" ) |
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| 29 | int BPF_USDT(urand_read_with_sema, int iter_num, int iter_cnt, int buf_sz) |
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| 30 | { |
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| 31 | if (urand_pid != (bpf_get_current_pid_tgid() >> 32)) |
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| 32 | return 0; |
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| 33 | |
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| 34 | __sync_fetch_and_add(&urand_read_with_sema_call_cnt, 1); |
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| 35 | __sync_fetch_and_add(&urand_read_with_sema_buf_sz_sum, buf_sz); |
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| 36 | |
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| 37 | return 0; |
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| 38 | } |
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| 39 | |
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| 40 | int urandlib_read_without_sema_call_cnt; |
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| 41 | int urandlib_read_without_sema_buf_sz_sum; |
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| 42 | |
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| 43 | SEC("usdt/./liburandom_read.so:urandlib:read_without_sema" ) |
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| 44 | int BPF_USDT(urandlib_read_without_sema, int iter_num, int iter_cnt, int buf_sz) |
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| 45 | { |
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| 46 | if (urand_pid != (bpf_get_current_pid_tgid() >> 32)) |
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| 47 | return 0; |
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| 48 | |
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| 49 | __sync_fetch_and_add(&urandlib_read_without_sema_call_cnt, 1); |
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| 50 | __sync_fetch_and_add(&urandlib_read_without_sema_buf_sz_sum, buf_sz); |
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| 51 | |
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| 52 | return 0; |
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| 53 | } |
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| 54 | |
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| 55 | int urandlib_read_with_sema_call_cnt; |
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| 56 | int urandlib_read_with_sema_buf_sz_sum; |
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| 57 | |
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| 58 | SEC("usdt/./liburandom_read.so:urandlib:read_with_sema" ) |
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| 59 | int BPF_USDT(urandlib_read_with_sema, int iter_num, int iter_cnt, int buf_sz) |
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| 60 | { |
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| 61 | if (urand_pid != (bpf_get_current_pid_tgid() >> 32)) |
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| 62 | return 0; |
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| 63 | |
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| 64 | __sync_fetch_and_add(&urandlib_read_with_sema_call_cnt, 1); |
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| 65 | __sync_fetch_and_add(&urandlib_read_with_sema_buf_sz_sum, buf_sz); |
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| 66 | |
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| 67 | return 0; |
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| 68 | } |
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| 69 | |
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| 70 | char _license[] SEC("license" ) = "GPL" ; |
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| 71 | |
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