arm64: mm: allow the kernel to handle alignment faults on user accesses

[cascardo/linux.git] / arch / arm64 / mm / fault.c

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 92ddac1..abe2a95 100644 (file)
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -371,6 +371,13 @@ static int __kprobes do_translation_fault(unsigned long addr,
        return 0;
 }
 
+static int do_alignment_fault(unsigned long addr, unsigned int esr,
+                             struct pt_regs *regs)
+{
+       do_bad_area(addr, esr, regs);
+       return 0;
+}
+
 /*
  * This abort handler always returns "fault".
  */
@@ -418,7 +425,7 @@ static struct fault_info {
        { do_bad,               SIGBUS,  0,             "synchronous parity error (translation table walk)" },
        { do_bad,               SIGBUS,  0,             "synchronous parity error (translation table walk)" },
        { do_bad,               SIGBUS,  0,             "unknown 32"                    },
-       { do_bad,               SIGBUS,  BUS_ADRALN,    "alignment fault"               },
+       { do_alignment_fault,   SIGBUS,  BUS_ADRALN,    "alignment fault"               },
        { do_bad,               SIGBUS,  0,             "unknown 34"                    },
        { do_bad,               SIGBUS,  0,             "unknown 35"                    },
        { do_bad,               SIGBUS,  0,             "unknown 36"                    },