include/linux/kfence.h

File Facts

System

Linux kernel

Corpus path

include/linux/kfence.h

Extension

.h

Size

8929 bytes

Lines

255

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/mm.h
• linux/types.h
• linux/atomic.h
• linux/static_key.h

Detected Declarations

• struct kmem_obj_info
• struct kmem_obj_info
• function constant
• function kfence_alloc
• function kfence_free
• function is_kfence_address
• function kfence_alloc_pool_and_metadata
• function kfence_ksize
• function __kfence_free
• function kfence_handle_page_fault
• function __kfence_obj_info

Annotated Snippet

static inline bool is_kfence_address(const void *addr) { return false; }
static inline void kfence_alloc_pool_and_metadata(void) { }
static inline void kfence_init(void) { }
static inline void kfence_shutdown_cache(struct kmem_cache *s) { }
static inline void *kfence_alloc(struct kmem_cache *s, size_t size, gfp_t flags) { return NULL; }
static inline size_t kfence_ksize(const void *addr) { return 0; }
static inline void *kfence_object_start(const void *addr) { return NULL; }
static inline void __kfence_free(void *addr) { }
static inline bool __must_check kfence_free(void *addr) { return false; }
static inline bool __must_check kfence_handle_page_fault(unsigned long addr, bool is_write,
							 struct pt_regs *regs)
{
	return false;
}

#ifdef CONFIG_PRINTK
struct kmem_obj_info;
static inline bool __kfence_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
{
	return false;
}
#endif

#endif

#endif /* _LINUX_KFENCE_H */

Annotation

• Immediate include surface: `linux/mm.h`, `linux/types.h`, `linux/atomic.h`, `linux/static_key.h`.
• Detected declarations: `struct kmem_obj_info`, `struct kmem_obj_info`, `function constant`, `function kfence_alloc`, `function kfence_free`, `function is_kfence_address`, `function kfence_alloc_pool_and_metadata`, `function kfence_ksize`, `function __kfence_free`, `function kfence_handle_page_fault`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.