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_subskeleton_lib.c (1144B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) Meta Platforms, Inc. and affiliates. */
      3
      4#include <stdbool.h>
      5#include <linux/bpf.h>
      6#include <bpf/bpf_helpers.h>
      7
      8/* volatile to force a read */
      9const volatile int var1;
     10volatile int var2 = 1;
     11struct {
     12	int var3_1;
     13	__s64 var3_2;
     14} var3;
     15int libout1;
     16
     17extern volatile bool CONFIG_BPF_SYSCALL __kconfig;
     18
     19int var4[4];
     20
     21__weak int var5 SEC(".data");
     22
     23/* Fully contained within library extern-and-definition */
     24extern int var6;
     25
     26int var7 SEC(".data.custom");
     27
     28int (*fn_ptr)(void);
     29
     30struct {
     31	__uint(type, BPF_MAP_TYPE_HASH);
     32	__type(key, __u32);
     33	__type(value, __u32);
     34	__uint(max_entries, 16);
     35} map1 SEC(".maps");
     36
     37extern struct {
     38	__uint(type, BPF_MAP_TYPE_HASH);
     39	__type(key, __u32);
     40	__type(value, __u32);
     41	__uint(max_entries, 16);
     42} map2 SEC(".maps");
     43
     44int lib_routine(void)
     45{
     46	__u32 key = 1, value = 2;
     47
     48	(void) CONFIG_BPF_SYSCALL;
     49	bpf_map_update_elem(&map2, &key, &value, BPF_ANY);
     50
     51	libout1 = var1 + var2 + var3.var3_1 + var3.var3_2 + var5 + var6;
     52	return libout1;
     53}
     54
     55SEC("perf_event")
     56int lib_perf_handler(struct pt_regs *ctx)
     57{
     58	return 0;
     59}
     60
     61char LICENSE[] SEC("license") = "GPL";