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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include "linux/stddef.h"
#include "linux/fs.h"
#include "linux/smp_lock.h"
#include "linux/ptrace.h"
#include "linux/sched.h"
#include "asm/current.h"
#include "asm/processor.h"
#include "asm/uaccess.h"
#include "as-layout.h"
#include "mem_user.h"
#include "skas.h"
#include "os.h"
void flush_thread(void)
{
void *data = NULL;
unsigned long end = proc_mm ? TASK_SIZE : STUB_START;
int ret;
arch_flush_thread(¤t->thread.arch);
ret = unmap(¤t->mm->context.id, 0, end, 1, &data);
if (ret) {
printk(KERN_ERR "flush_thread - clearing address space failed, "
"err = %d\n", ret);
force_sig(SIGKILL, current);
}
__switch_mm(¤t->mm->context.id);
}
void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
{
set_fs(USER_DS);
PT_REGS_IP(regs) = eip;
PT_REGS_SP(regs) = esp;
}
#ifdef CONFIG_TTY_LOG
extern void log_exec(char **argv, void *tty);
#endif
static long execve1(char *file, char __user * __user *argv,
char __user *__user *env)
{
long error;
#ifdef CONFIG_TTY_LOG
struct tty_struct *tty;
mutex_lock(&tty_mutex);
tty = get_current_tty();
if (tty)
log_exec(argv, tty);
mutex_unlock(&tty_mutex);
#endif
error = do_execve(file, argv, env, ¤t->thread.regs);
if (error == 0) {
task_lock(current);
current->ptrace &= ~PT_DTRACE;
#ifdef SUBARCH_EXECVE1
SUBARCH_EXECVE1(¤t->thread.regs.regs);
#endif
task_unlock(current);
}
return error;
}
long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
{
long err;
err = execve1(file, argv, env);
if (!err)
UML_LONGJMP(current->thread.exec_buf, 1);
return err;
}
long sys_execve(char __user *file, char __user *__user *argv,
char __user *__user *env)
{
long error;
char *filename;
lock_kernel();
filename = getname(file);
error = PTR_ERR(filename);
if (IS_ERR(filename)) goto out;
error = execve1(filename, argv, env);
putname(filename);
out:
unlock_kernel();
return error;
}
|
