Release 4.14 arch/um/kernel/skas/clone.c

/*
 * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#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 = (struct stub_data *) STUB_DATA;
	long err;

	err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
			    STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
	if (err != 0)
		goto out;

	err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
	if (err)
		goto out;

	remap_stack(data->fd, data->offset);
	goto done;

 out:
	/*
         * save current result.
         * Parent: pid;
         * child: retcode of mmap already saved and it jumps around this
         * assignment
         */
	data->err = err;
 done:
	trap_myself();
}
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Bodo Stroesser
102
72.34%
1
12.50%
Jeff Dike
34
24.11%
5
62.50%
Al Viro
4
2.84%
1
12.50%
Anton Ivanov
1
0.71%
1
12.50%
Total
141
100.00%
8
100.00%
Directory: arch/um/kernel/skas

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