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_probe_read_user_str.c (462B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#include <linux/bpf.h>
      4#include <bpf/bpf_helpers.h>
      5#include <bpf/bpf_tracing.h>
      6
      7#include <sys/types.h>
      8
      9pid_t pid = 0;
     10long ret = 0;
     11void *user_ptr = 0;
     12char buf[256] = {};
     13
     14SEC("tracepoint/syscalls/sys_enter_nanosleep")
     15int on_write(void *ctx)
     16{
     17	if (pid != (bpf_get_current_pid_tgid() >> 32))
     18		return 0;
     19
     20	ret = bpf_probe_read_user_str(buf, sizeof(buf), user_ptr);
     21
     22	return 0;
     23}
     24
     25char _license[] SEC("license") = "GPL";