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authorAndi Kleen <ak@linux.intel.com>2010-09-27 20:32:19 +0200
committerAndi Kleen <ak@linux.intel.com>2010-10-07 09:41:25 +0200
commita337fdac7a5622d1e6547f4b476c14dfe5a2c892 (patch)
tree2c4072b1188235f348f4ee58e18a027ec61ea4dc /kernel/signal.c
parent67159813127309c1a65d86e40fa0368241fa668c (diff)
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>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index bded6518778..919562c3d6b 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2215,6 +2215,14 @@ int copy_siginfo_to_user(siginfo_t __user *to, siginfo_t *from)
#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:
err |= __put_user(from->si_pid, &to->si_pid);