When access_process_vm is used in kernel/ptrace.c to write memory
to a debugged we were not correctly incrementing an address used to handle
memory faults. This meant that in some cases modifying memory in a child
process of a fork modified the memory of the parent as well. This patch
applies to version 2.4.17.

--- ptrace.c.orig	Fri Feb  1 20:17:18 2002
+++ ptrace.c	Sat Feb  2 00:53:43 2002
@@ -173,6 +173,7 @@
 		put_page(page);
 		len -= bytes;
 		buf += bytes;
+		addr += bytes;
 	}
 	up_read(&mm->mmap_sem);
 	mmput(mm);
-
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