Implement range of memory access validation instead of pointer and use

it. Export new validator to users.
Various small fixes

include/libpst-types.h

@@ -31,7 +31,7 @@ typedef struct {
     unw_word_t      lowpc;  ///< offset to start of the function against base address
     unw_word_t      highpc; ///< offset to the next address after the end of the function against base address
     unw_word_t      sp;     ///< SP register in function's frame
-    unw_word_t      cfa;    ///< CFA (Canonical Frame Address) of the function. !!! Don't use CFA provided by libunwind, it's not valid !!!
+    unw_word_t      cfa;    ///< CFA (Canonical Frame Address) of the function
     pst_fun_flags   flags;  ///< flags of various function options
 } pst_function_info;
 

include/libpst.h

@@ -27,8 +27,8 @@ typedef struct pst_parameter pst_parameter;
 /**
  * @brief allocate libpst handler and initialize the library
  * @param context context of process given to signal handler of a program. If NULL, then we are not in signal handler
- * @param buff pointer to buffer by libpst custom allocator(i.e. no malloc() will beused). if NULL, then standard allocator will be used
- * @param size of 'buff'
+ * @param buff pointer to buffer for libpst custom allocator(i.e. no malloc()/free() will be used). if NULL, then standard allocator will be used
+ * @param size of 'buff'. recommended size is not less than 4Kb
  *
  * @return pointer to handler to be used for all other operations. NULL in case of error
  */
@@ -83,6 +83,13 @@ const pst_function_info* pst_get_function_info(pst_function* function);
  */
 int pst_get_register(pst_function* function, int regno, unw_word_t* val);
 
+/**
+ * @brief Check memory range of process to validity (i.e. that process has access to this range)
+ * @param p pointer to start of range
+ * @param size size of range to check
+ */
+int pst_pointer_valid(void *p, uint32_t size);
+
 /**
  * @brief Get next parameter's handle in function
  * @param function Function's handler obtained by pst_get_next_function()

src/common.c

@@ -7,6 +7,10 @@
 
 #include <inttypes.h>
 #include <stdbool.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <errno.h>
+
 #include "context.h"
 
 int32_t decode_sleb128(uint8_t *sleb128)
@@ -116,11 +120,7 @@ unsigned getSLEB128Size(int64_t Value)
 	return Size;
 }
 
-#include <sys/mman.h>
-#include <unistd.h>
-#include <errno.h>
-
-int pst_pointer_valid(void *p)
+int pst_pointer_valid(void *p, uint32_t size)
 {
     long page_size = sysconf(_SC_PAGESIZE);
     if(page_size < 0) {
@@ -130,7 +130,7 @@ int pst_pointer_valid(void *p)
 
     void *aligned = (void *)((((long)p) / page_size) * page_size);
     //void *aligned = (void *)((uintptr_t)p & ~(page_size - 1));
-    if(msync(aligned, page_size, MS_ASYNC) == 0) {
+    if(msync(aligned, size, MS_ASYNC) == 0) {
         return 0;
     }
 

src/common.h

@@ -21,6 +21,6 @@
 
 int32_t decode_sleb128(uint8_t *sleb128);
 uint32_t decode_uleb128(uint8_t *uleb128);
-int pst_pointer_valid(void *p);
+int pst_pointer_valid(void *p, uint32_t size);
 
 #endif // __PST_COMMON_H__

src/dwarf/dwarf_call_site.c

@@ -147,7 +147,7 @@ void pst_call_site_init(pst_call_site* site, pst_context* c, uint64_t tgt, const
 
     site->target = tgt;
     if(orn) {
-        site->origin = strdup(orn);
+        site->origin = pst_strdup(orn);
     } else {
         site->origin = NULL;
     }

src/dwarf/dwarf_function.c

@@ -429,13 +429,14 @@ void pst_function_init(pst_function* fn, pst_context* _ctx, pst_function* _paren
     fn->info.pc = 0;
     fn->info.lowpc = 0;
     fn->info.highpc = 0;
-    bzero(&fn->context, sizeof(fn->context));
     fn->info.name = NULL;
     fn->info.line = -1;
     fn->info.file = NULL;
     fn->info.sp = 0;
+    fn->info.flags = 0;
 
     // internal fields
+    bzero(&fn->context, sizeof(fn->context));
     fn->die = NULL;
     list_head_init(&fn->params);
     pst_call_site_storage_init(&fn->call_sites, _ctx);

src/dwarf/dwarf_parameter.c

@@ -332,6 +332,8 @@ bool parameter_handle_type(pst_parameter* param, Dwarf_Die* result)
                     case DW_ATE_decimal_float:
                         parameter_add_type(param, type_name, PARAM_TYPE_FLOAT);
                         break;
+                    default:
+                        pst_log(SEVERITY_WARNING, "Unknown parameter base type encodings 0x%lX", enc_type);
                 }
 
             }
@@ -379,6 +381,9 @@ bool parameter_handle_type(pst_parameter* param, Dwarf_Die* result)
         case DW_TAG_volatile_type:
             parameter_add_type(param, NULL, PARAM_VOLATILE);
             break;
+        case DW_TAG_string_type:
+            pst_log(SEVERITY_DEBUG, "String type, skipping");
+            break;
         default:
             pst_log(SEVERITY_WARNING, "Unknown 0x%X tag type", dwarf_tag(&ret_die));
             break;
@@ -445,14 +450,10 @@ bool parameter_handle_dwarf(pst_parameter* param, Dwarf_Die* result, pst_functio
                 pst_log(SEVERITY_WARNING, "Unknown form '0x%X' of attribute for Constant value", dwarf_whatform(attr));
                 param->info.flags &= ~PARAM_HAS_VALUE;
         }
-
-        if(param->info.flags & PARAM_HAS_VALUE) {
-            pst_log(SEVERITY_DEBUG, "Parameter constant value: 0x%lX", param->info.value);
-        }
     }
 
     // check pointer validity
-    if((param->info.flags & (PARAM_TYPE_POINTER | PARAM_TYPE_FUNCPTR)) && pst_pointer_valid((void*)param->info.value)) {
+    if((param->info.flags & (PARAM_TYPE_POINTER | PARAM_TYPE_FUNCPTR)) && pst_pointer_valid((void*)param->info.value, sizeof((void*)param->info.size))) {
         param->info.flags |= PARAM_INVALID;
     }
 

src/dwarf/dwarf_stack.h

@@ -58,7 +58,7 @@ typedef union {
     void*       ptr;
 } pst_sized_value;
 
-typedef struct __pst_dwarf_value {
+typedef struct {
     list_node            node;       // uplink
 
     // fields