mpx: Extend siginfo structure to include bound violation information

This patch adds new fields about bound violation into siginfo
structure. si_lower and si_upper are respectively lower bound
and upper bound when bound violation is caused.

Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: linux-mm@kvack.org
Cc: linux-mips@linux-mips.org
Cc: Dave Hansen <dave@sr71.net>
Link: http://lkml.kernel.org/r/20141114151819.1908C900@viggo.jf.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 8f0876f9f6dd..2c403a4c8bee 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2748,6 +2748,10 @@ int copy_siginfo_to_user(siginfo_t __user *to, const siginfo_t *from)
                 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
+#ifdef SEGV_BNDERR
+                err |= __put_user(from->si_lower, &to->si_lower);
+                err |= __put_user(from->si_upper, &to->si_upper);
+#endif
                 break;
         case __SI_CHLD:
                 err |= __put_user(from->si_pid, &to->si_pid);