cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bpf_iter_test_kern6.c (428B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2020 Facebook */
      3#include "bpf_iter.h"
      4#include <bpf/bpf_helpers.h>
      5
      6char _license[] SEC("license") = "GPL";
      7
      8__u32 value_sum = 0;
      9
     10SEC("iter/bpf_map_elem")
     11int dump_bpf_hash_map(struct bpf_iter__bpf_map_elem *ctx)
     12{
     13	void *value = ctx->value;
     14
     15	if (value == (void *)0)
     16		return 0;
     17
     18	/* negative offset, verifier failure. */
     19	value_sum += *(__u32 *)(value - 4);
     20	return 0;
     21}