From: Andi Kleen <ak@linux.intel.com>
Date: Mon, 27 Sep 2010 18:32:19 +0000 (+0200)
Subject: HWPOISON: Copy si_addr_lsb to user
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a337fdac7a5622d1e6547f4b476c14dfe5a2c892;p=linux-beck.git

HWPOISON: Copy si_addr_lsb to user

The original hwpoison code added a new siginfo field si_addr_lsb to
pass the granuality of the fault address to user space. Unfortunately
this field was never copied to user space. Fix this here.

I added explicit checks for the MCEERR codes to avoid having
to patch all potential callers to initialize the field.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---

diff --git a/kernel/signal.c b/kernel/signal.c
index bded65187780..919562c3d6b7 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2214,6 +2214,14 @@ int copy_siginfo_to_user(siginfo_t __user *to, siginfo_t *from)
 		err |= __put_user(from->si_addr, &to->si_addr);
 #ifdef __ARCH_SI_TRAPNO
 		err |= __put_user(from->si_trapno, &to->si_trapno);
+#endif
+#ifdef BUS_MCEERR_AO
+		/* 
+		 * Other callers might not initialize the si_lsb field,
+	 	 * so check explicitely for the right codes here.
+		 */
+		if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
+			err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
 #endif
 		break;
 	case __SI_CHLD: