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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test_hash_large_key.c (802B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#include <linux/bpf.h>
      4#include <bpf/bpf_helpers.h>
      5
      6char _license[] SEC("license") = "GPL";
      7
      8struct {
      9	__uint(type, BPF_MAP_TYPE_HASH);
     10	__uint(max_entries, 2);
     11	__type(key, struct bigelement);
     12	__type(value, __u32);
     13} hash_map SEC(".maps");
     14
     15struct {
     16	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
     17	__uint(max_entries, 1);
     18	__type(key, __u32);
     19	__type(value, struct bigelement);
     20} key_map SEC(".maps");
     21
     22struct bigelement {
     23	int a;
     24	char b[4096];
     25	long long c;
     26};
     27
     28SEC("raw_tracepoint/sys_enter")
     29int bpf_hash_large_key_test(void *ctx)
     30{
     31	int zero = 0, err = 1, value = 42;
     32	struct bigelement *key;
     33
     34	key = bpf_map_lookup_elem(&key_map, &zero);
     35	if (!key)
     36		return 0;
     37
     38	key->c = 1;
     39	if (bpf_map_update_elem(&hash_map, key, &value, BPF_ANY))
     40		return 0;
     41
     42	return 0;
     43}
     44