#include <linux/signal.h>
#include <linux/audit.h>
#include <linux/pid_namespace.h>
+#include <linux/syscalls.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
void ptrace_untrace(struct task_struct *child)
{
spin_lock(&child->sighand->siglock);
- if (child->state == TASK_TRACED) {
+ if (task_is_traced(child)) {
if (child->signal->flags & SIGNAL_STOP_STOPPED) {
- child->state = TASK_STOPPED;
+ __set_task_state(child, TASK_STOPPED);
} else {
signal_wake_up(child, 1);
}
BUG_ON(!child->ptrace);
child->ptrace = 0;
- if (!list_empty(&child->ptrace_list)) {
+ if (ptrace_reparented(child)) {
list_del_init(&child->ptrace_list);
remove_parent(child);
child->parent = child->real_parent;
add_parent(child);
}
- if (child->state == TASK_TRACED)
+ if (task_is_traced(child))
ptrace_untrace(child);
}
* be changed by us so it's not changing right after this.
*/
read_lock(&tasklist_lock);
- if ((child->ptrace & PT_PTRACED) && child->parent == current &&
- (!(child->ptrace & PT_ATTACHED) || child->real_parent != current)
- && child->signal != NULL) {
+ if ((child->ptrace & PT_PTRACED) && child->parent == current) {
ret = 0;
+ /*
+ * child->sighand can't be NULL, release_task()
+ * does ptrace_unlink() before __exit_signal().
+ */
spin_lock_irq(&child->sighand->siglock);
- if (child->state == TASK_STOPPED) {
+ if (task_is_stopped(child))
child->state = TASK_TRACED;
- } else if (child->state != TASK_TRACED && !kill) {
+ else if (!task_is_traced(child) && !kill)
ret = -ESRCH;
- }
spin_unlock_irq(&child->sighand->siglock);
}
read_unlock(&tasklist_lock);
- if (!ret && !kill) {
+ if (!ret && !kill)
wait_task_inactive(child);
- }
/* All systems go.. */
return ret;
}
-static int may_attach(struct task_struct *task)
+int __ptrace_may_attach(struct task_struct *task)
{
/* May we inspect the given task?
* This check is used both for attaching with ptrace
{
int err;
task_lock(task);
- err = may_attach(task);
+ err = __ptrace_may_attach(task);
task_unlock(task);
return !err;
}
audit_ptrace(task);
retval = -EPERM;
- if (task->pid <= 1)
- goto out;
if (same_thread_group(task, current))
goto out;
/* the same process cannot be attached many times */
if (task->ptrace & PT_PTRACED)
goto bad;
- retval = may_attach(task);
+ retval = __ptrace_may_attach(task);
if (retval)
goto bad;
/* Go */
- task->ptrace |= PT_PTRACED | ((task->real_parent != current)
- ? PT_ATTACHED : 0);
+ task->ptrace |= PT_PTRACED;
if (capable(CAP_SYS_PTRACE))
task->ptrace |= PT_PTRACE_CAP;
__ptrace_link(task, current);
- force_sig_specific(SIGSTOP, task);
-
+ send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
bad:
write_unlock_irqrestore(&tasklist_lock, flags);
task_unlock(task);
return (data & ~PTRACE_O_MASK) ? -EINVAL : 0;
}
-static int ptrace_getsiginfo(struct task_struct *child, siginfo_t __user * data)
+static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
{
- siginfo_t lastinfo;
int error = -ESRCH;
read_lock(&tasklist_lock);
error = -EINVAL;
spin_lock_irq(&child->sighand->siglock);
if (likely(child->last_siginfo != NULL)) {
- lastinfo = *child->last_siginfo;
+ *info = *child->last_siginfo;
error = 0;
}
spin_unlock_irq(&child->sighand->siglock);
}
read_unlock(&tasklist_lock);
- if (!error)
- return copy_siginfo_to_user(data, &lastinfo);
return error;
}
-static int ptrace_setsiginfo(struct task_struct *child, siginfo_t __user * data)
+static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
{
- siginfo_t newinfo;
int error = -ESRCH;
- if (copy_from_user(&newinfo, data, sizeof (siginfo_t)))
- return -EFAULT;
-
read_lock(&tasklist_lock);
if (likely(child->sighand != NULL)) {
error = -EINVAL;
spin_lock_irq(&child->sighand->siglock);
if (likely(child->last_siginfo != NULL)) {
- *child->last_siginfo = newinfo;
+ *child->last_siginfo = *info;
error = 0;
}
spin_unlock_irq(&child->sighand->siglock);
return error;
}
+
+#ifdef PTRACE_SINGLESTEP
+#define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
+#else
+#define is_singlestep(request) 0
+#endif
+
+#ifdef PTRACE_SINGLEBLOCK
+#define is_singleblock(request) ((request) == PTRACE_SINGLEBLOCK)
+#else
+#define is_singleblock(request) 0
+#endif
+
+#ifdef PTRACE_SYSEMU
+#define is_sysemu_singlestep(request) ((request) == PTRACE_SYSEMU_SINGLESTEP)
+#else
+#define is_sysemu_singlestep(request) 0
+#endif
+
+static int ptrace_resume(struct task_struct *child, long request, long data)
+{
+ if (!valid_signal(data))
+ return -EIO;
+
+ if (request == PTRACE_SYSCALL)
+ set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ else
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+
+#ifdef TIF_SYSCALL_EMU
+ if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP)
+ set_tsk_thread_flag(child, TIF_SYSCALL_EMU);
+ else
+ clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
+#endif
+
+ if (is_singleblock(request)) {
+ if (unlikely(!arch_has_block_step()))
+ return -EIO;
+ user_enable_block_step(child);
+ } else if (is_singlestep(request) || is_sysemu_singlestep(request)) {
+ if (unlikely(!arch_has_single_step()))
+ return -EIO;
+ user_enable_single_step(child);
+ }
+ else
+ user_disable_single_step(child);
+
+ child->exit_code = data;
+ wake_up_process(child);
+
+ return 0;
+}
+
int ptrace_request(struct task_struct *child, long request,
long addr, long data)
{
int ret = -EIO;
+ siginfo_t siginfo;
switch (request) {
+ case PTRACE_PEEKTEXT:
+ case PTRACE_PEEKDATA:
+ return generic_ptrace_peekdata(child, addr, data);
+ case PTRACE_POKETEXT:
+ case PTRACE_POKEDATA:
+ return generic_ptrace_pokedata(child, addr, data);
+
#ifdef PTRACE_OLDSETOPTIONS
case PTRACE_OLDSETOPTIONS:
#endif
case PTRACE_GETEVENTMSG:
ret = put_user(child->ptrace_message, (unsigned long __user *) data);
break;
+
case PTRACE_GETSIGINFO:
- ret = ptrace_getsiginfo(child, (siginfo_t __user *) data);
+ ret = ptrace_getsiginfo(child, &siginfo);
+ if (!ret)
+ ret = copy_siginfo_to_user((siginfo_t __user *) data,
+ &siginfo);
break;
+
case PTRACE_SETSIGINFO:
- ret = ptrace_setsiginfo(child, (siginfo_t __user *) data);
+ if (copy_from_user(&siginfo, (siginfo_t __user *) data,
+ sizeof siginfo))
+ ret = -EFAULT;
+ else
+ ret = ptrace_setsiginfo(child, &siginfo);
break;
+
case PTRACE_DETACH: /* detach a process that was attached. */
ret = ptrace_detach(child, data);
break;
+
+#ifdef PTRACE_SINGLESTEP
+ case PTRACE_SINGLESTEP:
+#endif
+#ifdef PTRACE_SINGLEBLOCK
+ case PTRACE_SINGLEBLOCK:
+#endif
+#ifdef PTRACE_SYSEMU
+ case PTRACE_SYSEMU:
+ case PTRACE_SYSEMU_SINGLESTEP:
+#endif
+ case PTRACE_SYSCALL:
+ case PTRACE_CONT:
+ return ptrace_resume(child, request, data);
+
+ case PTRACE_KILL:
+ if (child->exit_state) /* already dead */
+ return 0;
+ return ptrace_resume(child, request, SIGKILL);
+
default:
break;
}
{
struct task_struct *child;
- /*
- * Tracing init is not allowed.
- */
- if (pid == 1)
- return ERR_PTR(-EPERM);
-
read_lock(&tasklist_lock);
child = find_task_by_vpid(pid);
if (child)
#define arch_ptrace_attach(child) do { } while (0)
#endif
-#ifndef __ARCH_SYS_PTRACE
asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
{
struct task_struct *child;
lock_kernel();
if (request == PTRACE_TRACEME) {
ret = ptrace_traceme();
+ if (!ret)
+ arch_ptrace_attach(current);
goto out;
}
unlock_kernel();
return ret;
}
-#endif /* __ARCH_SYS_PTRACE */
int generic_ptrace_peekdata(struct task_struct *tsk, long addr, long data)
{
copied = access_process_vm(tsk, addr, &data, sizeof(data), 1);
return (copied == sizeof(data)) ? 0 : -EIO;
}
+
+#if defined CONFIG_COMPAT && defined __ARCH_WANT_COMPAT_SYS_PTRACE
+#include <linux/compat.h>
+
+int compat_ptrace_request(struct task_struct *child, compat_long_t request,
+ compat_ulong_t addr, compat_ulong_t data)
+{
+ compat_ulong_t __user *datap = compat_ptr(data);
+ compat_ulong_t word;
+ siginfo_t siginfo;
+ int ret;
+
+ switch (request) {
+ case PTRACE_PEEKTEXT:
+ case PTRACE_PEEKDATA:
+ ret = access_process_vm(child, addr, &word, sizeof(word), 0);
+ if (ret != sizeof(word))
+ ret = -EIO;
+ else
+ ret = put_user(word, datap);
+ break;
+
+ case PTRACE_POKETEXT:
+ case PTRACE_POKEDATA:
+ ret = access_process_vm(child, addr, &data, sizeof(data), 1);
+ ret = (ret != sizeof(data) ? -EIO : 0);
+ break;
+
+ case PTRACE_GETEVENTMSG:
+ ret = put_user((compat_ulong_t) child->ptrace_message, datap);
+ break;
+
+ case PTRACE_GETSIGINFO:
+ ret = ptrace_getsiginfo(child, &siginfo);
+ if (!ret)
+ ret = copy_siginfo_to_user32(
+ (struct compat_siginfo __user *) datap,
+ &siginfo);
+ break;
+
+ case PTRACE_SETSIGINFO:
+ memset(&siginfo, 0, sizeof siginfo);
+ if (copy_siginfo_from_user32(
+ &siginfo, (struct compat_siginfo __user *) datap))
+ ret = -EFAULT;
+ else
+ ret = ptrace_setsiginfo(child, &siginfo);
+ break;
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ }
+
+ return ret;
+}
+
+asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
+ compat_long_t addr, compat_long_t data)
+{
+ struct task_struct *child;
+ long ret;
+
+ /*
+ * This lock_kernel fixes a subtle race with suid exec
+ */
+ lock_kernel();
+ if (request == PTRACE_TRACEME) {
+ ret = ptrace_traceme();
+ goto out;
+ }
+
+ child = ptrace_get_task_struct(pid);
+ if (IS_ERR(child)) {
+ ret = PTR_ERR(child);
+ goto out;
+ }
+
+ if (request == PTRACE_ATTACH) {
+ ret = ptrace_attach(child);
+ /*
+ * Some architectures need to do book-keeping after
+ * a ptrace attach.
+ */
+ if (!ret)
+ arch_ptrace_attach(child);
+ goto out_put_task_struct;
+ }
+
+ ret = ptrace_check_attach(child, request == PTRACE_KILL);
+ if (!ret)
+ ret = compat_arch_ptrace(child, request, addr, data);
+
+ out_put_task_struct:
+ put_task_struct(child);
+ out:
+ unlock_kernel();
+ return ret;
+}
+#endif /* CONFIG_COMPAT && __ARCH_WANT_COMPAT_SYS_PTRACE */