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_map_init.c (752B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2020 Tessares SA <http://www.tessares.net> */
      3
      4#include "vmlinux.h"
      5#include <bpf/bpf_helpers.h>
      6
      7__u64 inKey = 0;
      8__u64 inValue = 0;
      9__u32 inPid = 0;
     10
     11struct {
     12	__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
     13	__uint(max_entries, 2);
     14	__type(key, __u64);
     15	__type(value, __u64);
     16} hashmap1 SEC(".maps");
     17
     18
     19SEC("tp/syscalls/sys_enter_getpgid")
     20int sysenter_getpgid(const void *ctx)
     21{
     22	/* Just do it for once, when called from our own test prog. This
     23	 * ensures the map value is only updated for a single CPU.
     24	 */
     25	int cur_pid = bpf_get_current_pid_tgid() >> 32;
     26
     27	if (cur_pid == inPid)
     28		bpf_map_update_elem(&hashmap1, &inKey, &inValue, BPF_NOEXIST);
     29
     30	return 0;
     31}
     32
     33char _license[] SEC("license") = "GPL";