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 int ret; 23 24 arch_flush_thread(¤t->thread.arch); 25 26 ret = unmap(¤t->mm->context.id, 0, STUB_START, 0, &data); 27 ret = ret || unmap(¤t->mm->context.id, STUB_END, 28 host_task_size - STUB_END, 1, &data); 29 if (ret) { 30 printk(KERN_ERR "flush_thread - clearing address space failed, " 31 "err = %d\n", ret); 32 force_sig(SIGKILL, current); 33 } 34 35 __switch_mm(¤t->mm->context.id); 36 } 37 38 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp) 39 { 40 set_fs(USER_DS); 41 PT_REGS_IP(regs) = eip; 42 PT_REGS_SP(regs) = esp; 43 } 44 45 #ifdef CONFIG_TTY_LOG 46 extern void log_exec(char **argv, void *tty); 47 #endif 48 49 static long execve1(char *file, char __user * __user *argv, 50 char __user *__user *env) 51 { 52 long error; 53 #ifdef CONFIG_TTY_LOG 54 struct tty_struct *tty; 55 56 mutex_lock(&tty_mutex); 57 tty = get_current_tty(); 58 if (tty) 59 log_exec(argv, tty); 60 mutex_unlock(&tty_mutex); 61 #endif 62 error = do_execve(file, argv, env, ¤t->thread.regs); 63 if (error == 0) { 64 task_lock(current); 65 current->ptrace &= ~PT_DTRACE; 66 #ifdef SUBARCH_EXECVE1 67 SUBARCH_EXECVE1(¤t->thread.regs.regs); 68 #endif 69 task_unlock(current); 70 } 71 return error; 72 } 73 74 long um_execve(char *file, char __user *__user *argv, char __user *__user *env) 75 { 76 long err; 77 78 err = execve1(file, argv, env); 79 if (!err) 80 UML_LONGJMP(current->thread.exec_buf, 1); 81 return err; 82 } 83 84 long sys_execve(char __user *file, char __user *__user *argv, 85 char __user *__user *env) 86 { 87 long error; 88 char *filename; 89 90 lock_kernel(); 91 filename = getname(file); 92 error = PTR_ERR(filename); 93 if (IS_ERR(filename)) goto out; 94 error = execve1(filename, argv, env); 95 putname(filename); 96 out: 97 unlock_kernel(); 98 return error; 99 } 100