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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clone.c (1077B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
      4 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
      5 */
      6
      7#include <signal.h>
      8#include <sched.h>
      9#include <asm/unistd.h>
     10#include <sys/time.h>
     11#include <as-layout.h>
     12#include <ptrace_user.h>
     13#include <stub-data.h>
     14#include <sysdep/stub.h>
     15
     16/*
     17 * This is in a separate file because it needs to be compiled with any
     18 * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
     19 *
     20 * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
     21 * on some systems.
     22 */
     23
     24void __attribute__ ((__section__ (".__syscall_stub")))
     25stub_clone_handler(void)
     26{
     27	struct stub_data *data = get_stub_page();
     28	long err;
     29
     30	err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
     31			    (unsigned long)data + UM_KERN_PAGE_SIZE / 2);
     32	if (err) {
     33		data->parent_err = err;
     34		goto done;
     35	}
     36
     37	err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
     38	if (err) {
     39		data->child_err = err;
     40		goto done;
     41	}
     42
     43	remap_stack_and_trap();
     44
     45 done:
     46	trap_myself();
     47}