Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/stddef.h"
7#include "linux/fs.h"
8#include "linux/smp_lock.h"
9#include "linux/ptrace.h"
10#include "linux/sched.h"
11#include "asm/current.h"
12#include "asm/processor.h"
13#include "asm/uaccess.h"
14#include "as-layout.h"
15#include "mem_user.h"
16#include "skas.h"
17#include "os.h"
18#include "internal.h"
19
20void flush_thread(void)
21{
22 void *data = NULL;
23 int ret;
24
25 arch_flush_thread(¤t->thread.arch);
26
27 ret = unmap(¤t->mm->context.id, 0, STUB_START, 0, &data);
28 ret = ret || unmap(¤t->mm->context.id, STUB_END,
29 host_task_size - STUB_END, 1, &data);
30 if (ret) {
31 printk(KERN_ERR "flush_thread - clearing address space failed, "
32 "err = %d\n", ret);
33 force_sig(SIGKILL, current);
34 }
35
36 __switch_mm(¤t->mm->context.id);
37}
38
39void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
40{
41 set_fs(USER_DS);
42 PT_REGS_IP(regs) = eip;
43 PT_REGS_SP(regs) = esp;
44}
45
46static long execve1(char *file, char __user * __user *argv,
47 char __user *__user *env)
48{
49 long error;
50
51 error = do_execve(file, argv, env, ¤t->thread.regs);
52 if (error == 0) {
53 task_lock(current);
54 current->ptrace &= ~PT_DTRACE;
55#ifdef SUBARCH_EXECVE1
56 SUBARCH_EXECVE1(¤t->thread.regs.regs);
57#endif
58 task_unlock(current);
59 }
60 return error;
61}
62
63long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
64{
65 long err;
66
67 err = execve1(file, argv, env);
68 if (!err)
69 UML_LONGJMP(current->thread.exec_buf, 1);
70 return err;
71}
72
73long sys_execve(char __user *file, char __user *__user *argv,
74 char __user *__user *env)
75{
76 long error;
77 char *filename;
78
79 lock_kernel();
80 filename = getname(file);
81 error = PTR_ERR(filename);
82 if (IS_ERR(filename)) goto out;
83 error = execve1(filename, argv, env);
84 putname(filename);
85 out:
86 unlock_kernel();
87 return error;
88}