Fix DYLD Shared Cache (#3282)

* fix mem for shared cache

* Fix handling of missing DYLD Shared Cache

* Fix `_dyld_get_shared_cache_range` it has first required first argument.

* Rever cache changes

---------

Co-authored-by: Matt. <4922458+mbrla0@users.noreply.github.com>

pwndbg/aglib/macho.py

@@ -10,6 +10,7 @@ from typing import TypeVar
 
 import pwndbg
 import pwndbg.aglib.memory
+import pwndbg.aglib.symbol
 
 
 def _uleb128(ptr: int) -> Tuple[int, int]:
@@ -637,7 +638,10 @@ class DyldSharedCache:
         return DyldSharedCacheHashSet(ptr)
 
 
-@pwndbg.lib.cache.cache_until("exit")
+_global_new_variable_id = 0
+
+
+@pwndbg.lib.cache.cache_until("objfile")
 def shared_cache() -> DyldSharedCache | None:
     """
     Base address of the Darwin shared cache.
@@ -659,12 +663,22 @@ def shared_cache() -> DyldSharedCache | None:
     [1]: https://github.com/apple-oss-distributions/objc4/blob/f126469408dc82bd3f327217ae678fd0e6e3b37c/runtime/objc-opt.mm#L434
     [2]: https://github.com/apple-oss-distributions/dyld/blob/main/doc/dyld4.md#libdylddylib
     """
-    base = int(
-        pwndbg.dbg.selected_inferior().evaluate_expression(
-            "(const void*)_dyld_get_shared_cache_range()"
-        )
+    if pwndbg.aglib.symbol.lookup_symbol("_dyld_get_shared_cache_range") is None:
+        return None
+
+    # Due to bug: https://github.com/llvm/llvm-project/issues/84806#issuecomment-1995055683
+    # we have to create new variable on each call
+    global _global_new_variable_id
+    _global_new_variable_id += 1
+    var = f"$_pwndbg_internal_shared_cache_size{_global_new_variable_id}"
+
+    base = pwndbg.dbg.selected_inferior().evaluate_expression(
+        f"size_t {var} = 0; (const void*)_dyld_get_shared_cache_range(&{var})"
     )
+    if base.is_optimized_out:
+        return None
 
+    base = int(base)
     if base == 0:
         return None
 

pwndbg/lib/memory.py

@@ -33,6 +33,9 @@ def format_address(vaddr: int, memsz: int, permstr: str, offset: int, objfile: s
     "Format the given address as a string."
 
     width = 2 + 2 * pwndbg.aglib.arch.ptrsize
+    if memsz > 0x100000000:
+        return f"{vaddr:#{width}x} {vaddr + memsz:#{width}x} {permstr} {memsz:8x} {offset:6x} {objfile or ''}"
+
     return f"{vaddr:#{width}x} {vaddr + memsz:#{width}x} {permstr} {memsz:8x} {offset:7x} {objfile or ''}"