blob: ff5061f291674913e08c100fb21d31cd2d8bcd0a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*/
#include <signal.h>
#include <sched.h>
#include <asm/unistd.h>
#include <sys/time.h>
#include <as-layout.h>
#include <ptrace_user.h>
#include <stub-data.h>
#include <sysdep/stub.h>
/*
* This is in a separate file because it needs to be compiled with any
* extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
*
* Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
* on some systems.
*/
void __attribute__ ((__section__ (".__syscall_stub")))
stub_clone_handler(void)
{
struct stub_data *data = get_stub_page();
long err;
err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
(unsigned long)data + UM_KERN_PAGE_SIZE / 2);
if (err) {
data->parent_err = err;
goto done;
}
err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
if (err) {
data->child_err = err;
goto done;
}
remap_stack_and_trap();
done:
trap_myself();
}
|
