prepare for reading globals from ctx

libclamav/bytecode.c

@@ -67,6 +67,8 @@ struct cli_bc_ctx *cli_bytecode_context_alloc(void)
     ctx->line = 0;
     ctx->col = 0;
     ctx->mpool = NULL;
+    ctx->numGlobals = 0;
+    ctx->globals = NULL;
     return ctx;
 }
 

libclamav/bytecode_priv.h

@@ -147,6 +147,8 @@ struct cli_bc_ctx {
     unsigned line;
     unsigned col;
     mpool_t *mpool;
+    uint32_t numGlobals;
+    uint8_t* globals;
 };
 struct cli_all_bc;
 int cli_vm_execute(const struct cli_bc *bc, struct cli_bc_ctx *ctx, const struct cli_bc_func *func, const struct cli_bc_inst *inst);

libclamav/bytecode_vm.c

@@ -262,7 +262,15 @@ static always_inline struct stack_entry *pop_stack(struct stack *stack,
     x = *(uint_type(n)*)&(from)[(p)];\
     TRACE_R(x)
 
-#define READN(x, n, p) READNfrom(func->numBytes, values, x, n, p)
+#define READN(x, n, p)\
+ do {\
+     if (p&0x80000000) {\
+	 uint32_t pg = p&0x7fffffff;\
+	 READNfrom(ctx->numGlobals, ctx->globals, x, n, p);\
+     } else {\
+	 READNfrom(func->numBytes, values, x, n, p);\
+     }\
+ } while (0)
 
 #define READ1(x, p) READN(x, 8, p);\
     x = x&1