x86: compat_ptrace_request

[linux-2.6-block.git] / kernel / ptrace.c

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index e6a99d2793b36d567e28e060613bf39a9497f3bd..ed1c3d56c2cde16f3db6f4725f1cdd8d41b2e383 100644 (file)
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -607,3 +607,41 @@ int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data)
        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 */