Fix: bytecode validator: reject specialized load instructions

[lttng-ust.git] / src / lib / lttng-ust / lttng-bytecode-validator.c

diff --git a/src/lib/lttng-ust/lttng-bytecode-validator.c b/src/lib/lttng-ust/lttng-bytecode-validator.c
index 1a3649c16080cd57bdc2170390fb0bffc3aea920..d727270ae7bcd10bc89eddfbbdacf1ff887cb8ec 100644 (file)
--- a/src/lib/lttng-ust/lttng-bytecode-validator.c
+++ b/src/lib/lttng-ust/lttng-bytecode-validator.c
@@ -1104,60 +1104,28 @@ int validate_instruction_context(
                dbg_printf("Validate load field\n");
                break;
        }
+
+       /*
+        * Disallow already specialized bytecode op load field instructions to
+        * ensure that the received bytecode does not read a memory area larger
+        * than the memory targeted by the instrumentation.
+        */
        case BYTECODE_OP_LOAD_FIELD_S8:
-       {
-               dbg_printf("Validate load field s8\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_S16:
-       {
-               dbg_printf("Validate load field s16\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_S32:
-       {
-               dbg_printf("Validate load field s32\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_S64:
-       {
-               dbg_printf("Validate load field s64\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_U8:
-       {
-               dbg_printf("Validate load field u8\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_U16:
-       {
-               dbg_printf("Validate load field u16\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_U32:
-       {
-               dbg_printf("Validate load field u32\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_U64:
-       {
-               dbg_printf("Validate load field u64\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_STRING:
-       {
-               dbg_printf("Validate load field string\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_SEQUENCE:
-       {
-               dbg_printf("Validate load field sequence\n");
-               break;
-       }
        case BYTECODE_OP_LOAD_FIELD_DOUBLE:
        {
-               dbg_printf("Validate load field double\n");
-               break;
+               dbg_printf("Validate load field, reject specialized load instruction (%d)\n",
+                               (int) opcode);
+               ret = -EINVAL;
+               goto end;
        }
 
        case BYTECODE_OP_GET_SYMBOL: