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 19 void flush_thread(void) 20 { 21 void *data = NULL; 22 unsigned long end = proc_mm ? task_size : STUB_START; 23 int ret; 24 25 arch_flush_thread(¤t->thread.arch); 26 27 ret = unmap(¤t->mm->context.id, 0, end, 1, &data); 28 if (ret) { 29 printk(KERN_ERR "flush_thread - clearing address space failed, " 30 "err = %d\n", ret); 31 force_sig(SIGKILL, current); 32 } 33 34 __switch_mm(¤t->mm->context.id); 35 } 36 37 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp) 38 { 39 set_fs(USER_DS); 40 PT_REGS_IP(regs) = eip; 41 PT_REGS_SP(regs) = esp; 42 } 43 44 #ifdef CONFIG_TTY_LOG 45 extern void log_exec(char **argv, void *tty); 46 #endif 47 48 static long execve1(char *file, char __user * __user *argv, 49 char __user *__user *env) 50 { 51 long error; 52 #ifdef CONFIG_TTY_LOG 53 struct tty_struct *tty; 54 55 mutex_lock(&tty_mutex); 56 tty = get_current_tty(); 57 if (tty) 58 log_exec(argv, tty); 59 mutex_unlock(&tty_mutex); 60 #endif 61 error = do_execve(file, argv, env, ¤t->thread.regs); 62 if (error == 0) { 63 task_lock(current); 64 current->ptrace &= ~PT_DTRACE; 65 #ifdef SUBARCH_EXECVE1 66 SUBARCH_EXECVE1(¤t->thread.regs.regs); 67 #endif 68 task_unlock(current); 69 } 70 return error; 71 } 72 73 long um_execve(char *file, char __user *__user *argv, char __user *__user *env) 74 { 75 long err; 76 77 err = execve1(file, argv, env); 78 if (!err) 79 UML_LONGJMP(current->thread.exec_buf, 1); 80 return err; 81 } 82 83 long sys_execve(char __user *file, char __user *__user *argv, 84 char __user *__user *env) 85 { 86 long error; 87 char *filename; 88 89 lock_kernel(); 90 filename = getname(file); 91 error = PTR_ERR(filename); 92 if (IS_ERR(filename)) goto out; 93 error = execve1(filename, argv, env); 94 putname(filename); 95 out: 96 unlock_kernel(); 97 return error; 98 } 99