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_user.c (787B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#include <linux/ptrace.h>
      4#include <linux/bpf.h>
      5
      6#include <netinet/in.h>
      7
      8#include <bpf/bpf_helpers.h>
      9#include <bpf/bpf_tracing.h>
     10#include "bpf_misc.h"
     11
     12static struct sockaddr_in old;
     13
     14SEC("kprobe/" SYS_PREFIX "sys_connect")
     15int BPF_KPROBE(handle_sys_connect)
     16{
     17#if SYSCALL_WRAPPER == 1
     18	struct pt_regs *real_regs;
     19#endif
     20	struct sockaddr_in new;
     21	void *ptr;
     22
     23#if SYSCALL_WRAPPER == 0
     24	ptr = (void *)PT_REGS_PARM2(ctx);
     25#else
     26	real_regs = (struct pt_regs *)PT_REGS_PARM1(ctx);
     27	bpf_probe_read_kernel(&ptr, sizeof(ptr), &PT_REGS_PARM2(real_regs));
     28#endif
     29
     30	bpf_probe_read_user(&old, sizeof(old), ptr);
     31	__builtin_memset(&new, 0xab, sizeof(new));
     32	bpf_probe_write_user(ptr, &new, sizeof(new));
     33
     34	return 0;
     35}
     36
     37char _license[] SEC("license") = "GPL";