[PATCH v2 2/4] s390x: sclp: boundary check

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

From: Janosch Frank <frankja@linux.ibm.com>

All sclp codes need to be checked for page boundary violations.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
---
 hw/s390x/sclp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index 95ebfe7..73244c9 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -234,6 +234,11 @@ int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
         goto out_write;
     }
 
+    if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK) + PAGE_SIZE)) {
+        work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
+        goto out_write;
+    }
+
     sclp_c->execute(sclp, &work_sccb, code);
 out_write:
     cpu_physical_memory_write(sccb, &work_sccb,
-- 
2.7.4