* Copyright (C) 2000 Russell King
*/
-#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/string.h>
+#include <linux/signal.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>
-/*
- * Get the address of the live pt_regs for the specified task.
- * These are saved onto the top kernel stack when the process
- * is not running.
- *
- * Note: if a user thread is execve'd from kernel space, the
- * kernel stack will not be empty on entry to the kernel, so
- * ptracing these tasks will fail.
- */
-static inline struct pt_regs *
-get_user_regs(struct task_struct *task)
-{
- return (struct pt_regs *)
- ((unsigned long)task->thread_info + THREAD_SIZE
- - sizeof(struct pt_regs));
-}
-
/*
* This routine will get a word off of the process kernel stack.
*/
{
unsigned long *stack;
- stack = (unsigned long *)get_user_regs(task);
+ stack = (unsigned long *)task_pt_regs(task);
return stack[offset];
}
{
unsigned long *stack;
- stack = (unsigned long *)get_user_regs(task);
+ stack = (unsigned long *)task_pt_regs(task);
stack[offset] = data;
return 0;
*/
static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
{
- struct pt_regs *regs = get_user_regs(tsk);
+ struct pt_regs *regs = task_pt_regs(tsk);
return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
}
ret = -EFAULT;
if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) {
- struct pt_regs *regs = get_user_regs(tsk);
+ struct pt_regs *regs = task_pt_regs(tsk);
*regs = newregs;
ret = 0;
}
case PTRACE_SYSCALL:
case PTRACE_CONT:
ret = -EIO;
- if ((unsigned long) data > _NSIG)
+ if (!valid_signal(data))
break;
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
unsigned long pc, insn;
ret = -EIO;
- if ((unsigned long) data > _NSIG)
+ if (!valid_signal(data))
break;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
if ((child->ptrace & PT_DTRACE) == 0) {
return ret;
}
-asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
+asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
{
struct task_struct *child;
int ret;
lock_kernel();
- ret = -EPERM;
if (request == PTRACE_TRACEME) {
- /* are we already being traced? */
- if (current->ptrace & PT_PTRACED)
- goto out;
- /* set the ptrace bit in the process flags. */
- current->ptrace |= PT_PTRACED;
- ret = 0;
+ ret = ptrace_traceme();
goto out;
}
- ret = -ESRCH;
- read_lock(&tasklist_lock);
- child = find_task_by_pid(pid);
- if (child)
- get_task_struct(child);
- read_unlock(&tasklist_lock);
- if (!child)
- goto out;
- ret = -EPERM;
- if (pid == 1) /* you may not mess with init */
+ child = ptrace_get_task_struct(pid);
+ if (IS_ERR(child)) {
+ ret = PTR_ERR(child);
goto out;
+ }
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);