| /* |
| * 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; |
| int ret; |
| |
| arch_flush_thread(¤t->thread.arch); |
| |
| ret = unmap(¤t->mm->context.id, 0, STUB_START, 0, &data); |
| ret = ret || unmap(¤t->mm->context.id, STUB_END, |
| TASK_SIZE - STUB_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; |
| } |