[PATCH 6/8] signal/x86: Fix SIGSYS handling in copy_siginfo_to_user32

["Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>]

While examining the code I realized that we don't copy si_call_addr to
32bit callers.  Fix it.

It looks like no one has used this code path in the last 5 years.

Cc: Will Drewry <wad-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Cc: H. Peter Anvin <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Cc: Eric Paris <eparis-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Serge Hallyn <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
Cc: James Morris <james.l.morris-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Fixes: a0727e8ce513 ("signal, x86: add SIGSYS info and make it synchronous.")
Signed-off-by: "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
---
 arch/x86/kernel/signal_compat.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index 71beb28600d4..59e1029bb3d0 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -161,6 +161,7 @@ int __copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from,
 				}
 				break;
 			case __SI_SYS >> 16:
+				put_user_ex(ptr_to_compat(from->si_call_addr), &to->si_call_addr);
 				put_user_ex(from->si_syscall, &to->si_syscall);
 				put_user_ex(from->si_arch, &to->si_arch);
 				break;
-- 
2.10.1