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 "mem_user.h" 15 #include "skas.h" 16 #include "os.h" 17 18 void flush_thread(void) 19 { 20 void *data = NULL; 21 unsigned long end = proc_mm ? task_size : CONFIG_STUB_START; 22 int ret; 23 24 arch_flush_thread(¤t->thread.arch); 25 26 ret = unmap(¤t->mm->context.id, 0, end, 1, &data); 27 if (ret) { 28 printk(KERN_ERR "flush_thread - clearing address space failed, " 29 "err = %d\n", ret); 30 force_sig(SIGKILL, current); 31 } 32 33 __switch_mm(¤t->mm->context.id); 34 } 35 36 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp) 37 { 38 set_fs(USER_DS); 39 PT_REGS_IP(regs) = eip; 40 PT_REGS_SP(regs) = esp; 41 } 42 43 #ifdef CONFIG_TTY_LOG 44 extern void log_exec(char **argv, void *tty); 45 #endif 46 47 static long execve1(char *file, char __user * __user *argv, 48 char __user *__user *env) 49 { 50 long error; 51 #ifdef CONFIG_TTY_LOG 52 struct tty_struct *tty; 53 54 mutex_lock(&tty_mutex); 55 tty = get_current_tty(); 56 if (tty) 57 log_exec(argv, tty); 58 mutex_unlock(&tty_mutex); 59 #endif 60 error = do_execve(file, argv, env, ¤t->thread.regs); 61 if (error == 0) { 62 task_lock(current); 63 current->ptrace &= ~PT_DTRACE; 64 #ifdef SUBARCH_EXECVE1 65 SUBARCH_EXECVE1(¤t->thread.regs.regs); 66 #endif 67 task_unlock(current); 68 } 69 return error; 70 } 71 72 long um_execve(char *file, char __user *__user *argv, char __user *__user *env) 73 { 74 long err; 75 76 err = execve1(file, argv, env); 77 if (!err) 78 UML_LONGJMP(current->thread.exec_buf, 1); 79 return err; 80 } 81 82 long sys_execve(char __user *file, char __user *__user *argv, 83 char __user *__user *env) 84 { 85 long error; 86 char *filename; 87 88 lock_kernel(); 89 filename = getname(file); 90 error = PTR_ERR(filename); 91 if (IS_ERR(filename)) goto out; 92 error = execve1(filename, argv, env); 93 putname(filename); 94 out: 95 unlock_kernel(); 96 return error; 97 } 98