cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

tracex5_kern.c (2294B)

      1/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
      2 *
      3 * This program is free software; you can redistribute it and/or
      4 * modify it under the terms of version 2 of the GNU General Public
      5 * License as published by the Free Software Foundation.
      6 */
      7#include <linux/ptrace.h>
      8#include <linux/version.h>
      9#include <uapi/linux/bpf.h>
     10#include <uapi/linux/seccomp.h>
     11#include <uapi/linux/unistd.h>
     12#include "syscall_nrs.h"
     13#include <bpf/bpf_helpers.h>
     14#include <bpf/bpf_tracing.h>
     15
     16#define PROG(F) SEC("kprobe/"__stringify(F)) int bpf_func_##F
     17
     18struct {
     19	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
     20	__uint(key_size, sizeof(u32));
     21	__uint(value_size, sizeof(u32));
     22#ifdef __mips__
     23	__uint(max_entries, 6000); /* MIPS n64 syscalls start at 5000 */
     24#else
     25	__uint(max_entries, 1024);
     26#endif
     27} progs SEC(".maps");
     28
     29SEC("kprobe/__seccomp_filter")
     30int bpf_prog1(struct pt_regs *ctx)
     31{
     32	int sc_nr = (int)PT_REGS_PARM1(ctx);
     33
     34	/* dispatch into next BPF program depending on syscall number */
     35	bpf_tail_call(ctx, &progs, sc_nr);
     36
     37	/* fall through -> unknown syscall */
     38	if (sc_nr >= __NR_getuid && sc_nr <= __NR_getsid) {
     39		char fmt[] = "syscall=%d (one of get/set uid/pid/gid)\n";
     40		bpf_trace_printk(fmt, sizeof(fmt), sc_nr);
     41	}
     42	return 0;
     43}
     44
     45/* we jump here when syscall number == __NR_write */
     46PROG(SYS__NR_write)(struct pt_regs *ctx)
     47{
     48	struct seccomp_data sd;
     49
     50	bpf_probe_read_kernel(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
     51	if (sd.args[2] == 512) {
     52		char fmt[] = "write(fd=%d, buf=%p, size=%d)\n";
     53		bpf_trace_printk(fmt, sizeof(fmt),
     54				 sd.args[0], sd.args[1], sd.args[2]);
     55	}
     56	return 0;
     57}
     58
     59PROG(SYS__NR_read)(struct pt_regs *ctx)
     60{
     61	struct seccomp_data sd;
     62
     63	bpf_probe_read_kernel(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
     64	if (sd.args[2] > 128 && sd.args[2] <= 1024) {
     65		char fmt[] = "read(fd=%d, buf=%p, size=%d)\n";
     66		bpf_trace_printk(fmt, sizeof(fmt),
     67				 sd.args[0], sd.args[1], sd.args[2]);
     68	}
     69	return 0;
     70}
     71
     72#ifdef __NR_mmap2
     73PROG(SYS__NR_mmap2)(struct pt_regs *ctx)
     74{
     75	char fmt[] = "mmap2\n";
     76
     77	bpf_trace_printk(fmt, sizeof(fmt));
     78	return 0;
     79}
     80#endif
     81
     82#ifdef __NR_mmap
     83PROG(SYS__NR_mmap)(struct pt_regs *ctx)
     84{
     85	char fmt[] = "mmap\n";
     86
     87	bpf_trace_printk(fmt, sizeof(fmt));
     88	return 0;
     89}
     90#endif
     91
     92char _license[] SEC("license") = "GPL";
     93u32 _version SEC("version") = LINUX_VERSION_CODE;