commit 71ae18ec690953e9ba7107c7cc44589c2cc0d9f1
Author: Blaisorblade <blaisorblade@yahoo.it>
Date:   Wed Jul 27 11:45:18 2005 -0700

    [PATCH] sys_get_thread_area does not clear the returned argument
    
    sys_get_thread_area does not memset to 0 its struct user_desc info before
    copying it to user space...  since sizeof(struct user_desc) is 16 while the
    actual datas which are filled are only 12 bytes + 9 bits (across the
    bitfields), there is a (small) information leak.
    
    Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index d949205..e3f362e 100644
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -917,6 +917,8 @@ asmlinkage int sys_get_thread_area(struct user_desc __user *u_info)
 	if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
 		return -EINVAL;
 
+	memset(&info, 0, sizeof(info));
+
 	desc = current->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
 
 	info.entry_number = idx;