kernel/slab: Use FIFO instead of LIFO queueing for the object cache.

This should make use-after-frees more likely to be caught by the standard paranoia facilities (and make them less likely to be exploitable as memory will take longer to be reused.)
2025-09-03 15:41:58 -04:00
parent 0937305b84
commit bc50ada648
9 changed files with 147 additions and 96 deletions
@@ -1,57 +0,0 @@
-/*
- * Copyright 2010, Axel Dörfler. All Rights Reserved.
- * Copyright 2007, Hugo Santos. All Rights Reserved.
- * Distributed under the terms of the MIT License.
- */
-#ifndef _SLAB_OBJECT_DEPOT_H_
-#define _SLAB_OBJECT_DEPOT_H_
-
-
-#include <lock.h>
-#include <KernelExport.h>
-
-
-struct DepotMagazine;
-
-typedef struct object_depot {
-	rw_lock					outer_lock;
-	spinlock				inner_lock;
-	DepotMagazine*			full;
-	DepotMagazine*			empty;
-	size_t					full_count;
-	size_t					empty_count;
-	size_t					max_count;
-	size_t					magazine_capacity;
-	struct depot_cpu_store*	stores;
-	void*					cookie;
-
-	void (*return_object)(struct object_depot* depot, void* cookie,
-		void* object, uint32 flags);
-} object_depot;
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-status_t object_depot_init(object_depot* depot, size_t capacity,
-	size_t maxCount, uint32 flags, void* cookie,
-	void (*returnObject)(object_depot* depot, void* cookie, void* object,
-		uint32 flags));
-void object_depot_destroy(object_depot* depot, uint32 flags);
-
-void* object_depot_obtain(object_depot* depot);
-void object_depot_store(object_depot* depot, void* object, uint32 flags);
-
-void object_depot_make_empty(object_depot* depot, uint32 flags);
-
-#if PARANOID_KERNEL_FREE
-bool object_depot_contains_object(object_depot* depot, void* object);
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-
-#endif	/* _SLAB_OBJECT_DEPOT_H_ */