x86: compat_ptrace_request
This adds a compat_ptrace_request that is the analogue of ptrace_request
for the things that 32-on-64 ptrace implementations can share in common.
So far there are just a couple of requests handled generically.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/include/linux/compat.h b/include/linux/compat.h
index ba29d4c..a907fbe 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -243,6 +243,10 @@
compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
const compat_ulong_t __user *new_nodes);
+extern int compat_ptrace_request(struct task_struct *child,
+ compat_long_t request,
+ compat_ulong_t addr, compat_ulong_t data);
+
/*
* epoll (fs/eventpoll.c) compat bits follow ...
*/
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index e6a99d2..ed1c3d5 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -607,3 +607,41 @@
copied = access_process_vm(tsk, addr, &data, sizeof(data), 1);
return (copied == sizeof(data)) ? 0 : -EIO;
}
+
+#ifdef CONFIG_COMPAT
+#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;
+ 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;
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ }
+
+ return ret;
+}
+#endif /* CONFIG_COMPAT */
