X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=kernel%2Fptrace.c;h=67e392ed5496e97c54100edaa2557e2813d6faa8;hb=3d61f75eefedf75914ab4453c67aaa2ee64bcf93;hp=e6e9b8be4b053c5f0074bdeca6f1a4ac9517e8fb;hpb=5bdeae46be6dfe9efa44a548bd622af325f4bdb4;p=~andy%2Flinux

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index e6e9b8be4b0..67e392ed549 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -20,6 +20,7 @@
 #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>
@@ -51,9 +52,9 @@ void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
 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);
 		}
@@ -79,7 +80,7 @@ void __ptrace_unlink(struct task_struct *child)
 		add_parent(child);
 	}
 
-	if (child->state == TASK_TRACED)
+	if (task_is_traced(child))
 		ptrace_untrace(child);
 }
 
@@ -98,23 +99,23 @@ int ptrace_check_attach(struct task_struct *child, int kill)
 	 * 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;
@@ -201,8 +202,7 @@ repeat:
 		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;
 
@@ -323,9 +323,8 @@ static int ptrace_setoptions(struct task_struct *child, long data)
 	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);
@@ -333,31 +332,25 @@ static int ptrace_getsiginfo(struct task_struct *child, siginfo_t __user * data)
 		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);
@@ -424,6 +417,7 @@ int ptrace_request(struct task_struct *child, long request,
 		   long addr, long data)
 {
 	int ret = -EIO;
+	siginfo_t siginfo;
 
 	switch (request) {
 	case PTRACE_PEEKTEXT:
@@ -442,12 +436,22 @@ int ptrace_request(struct task_struct *child, long request,
 	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;
@@ -616,6 +620,7 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
 {
 	compat_ulong_t __user *datap = compat_ptr(data);
 	compat_ulong_t word;
+	siginfo_t siginfo;
 	int ret;
 
 	switch (request) {
@@ -638,6 +643,23 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
 		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);
 	}