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All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #ifndef _VM_VM_MAP_XNU_H_ #define _VM_VM_MAP_XNU_H_ #ifdef XNU_KERNEL_PRIVATE #include <mach/vm_types.h> #include <sys/cdefs.h> #include <vm/vm_map.h> __BEGIN_DECLS extern void vm_map_reference(vm_map_t map); extern vm_map_t current_map(void); /* Setup reserved areas in a new VM map */ extern kern_return_t vm_map_exec( vm_map_t new_map, task_t task, boolean_t is64bit, void *fsroot, cpu_type_t cpu, cpu_subtype_t cpu_subtype, boolean_t reslide, boolean_t is_driverkit, uint32_t rsr_version); #ifdef MACH_KERNEL_PRIVATE #define current_map_fast() (current_thread()->map) #define current_map() (current_map_fast()) /* * Types defined: * * vm_map_t the high-level address map data structure. * vm_map_entry_t an entry in an address map. * vm_map_version_t a timestamp of a map, for use with vm_map_lookup * vm_map_copy_t represents memory copied from an address map, * used for inter-map copy operations */ typedef struct vm_map_entry *vm_map_entry_t; #define VM_MAP_ENTRY_NULL ((vm_map_entry_t) NULL) #define named_entry_lock_init(object) lck_mtx_init(&(object)->Lock, &vm_object_lck_grp, &vm_object_lck_attr) #define named_entry_lock_destroy(object) lck_mtx_destroy(&(object)->Lock, &vm_object_lck_grp) #define named_entry_lock(object) lck_mtx_lock(&(object)->Lock) #define named_entry_unlock(object) lck_mtx_unlock(&(object)->Lock) /* * Type: vm_named_entry_t [internal use only] * * Description: * Description of a mapping to a memory cache object. * * Implementation: * While the handle to this object is used as a means to map * and pass around the right to map regions backed by pagers * of all sorts, the named_entry itself is only manipulated * by the kernel. Named entries hold information on the * right to map a region of a cached object. Namely, * the target cache object, the beginning and ending of the * region to be mapped, and the permissions, (read, write) * with which it can be mapped. * */ struct vm_named_entry { decl_lck_mtx_data(, Lock); /* Synchronization */ union { vm_map_t map; /* map backing submap */ vm_map_copy_t copy; /* a VM map copy */ } backing; vm_object_offset_t offset; /* offset into object */ vm_object_size_t size; /* size of region */ vm_object_offset_t data_offset; /* offset to first byte of data */ unsigned int /* Is backing.xxx : */ /* unsigned */ access:8, /* MAP_MEM_* */ /* vm_prot_t */ protection:4, /* access permissions */ /* boolean_t */ is_object:1, /* ... a VM object (wrapped in a VM map copy) */ /* boolean_t */ internal:1, /* ... an internal object */ /* boolean_t */ is_sub_map:1, /* ... a submap? */ /* boolean_t */ is_copy:1, /* ... a VM map copy */ /* boolean_t */ is_fully_owned:1; /* ... all objects are owned */ #if VM_NAMED_ENTRY_DEBUG uint32_t named_entry_bt; /* btref_t */ #endif /* VM_NAMED_ENTRY_DEBUG */ }; /* * Bit 3 of the protection and max_protection bitfields in a vm_map_entry * does not correspond to bit 3 of a vm_prot_t, so these macros provide a means * to convert between the "packed" representation in the vm_map_entry's fields * and the equivalent bits defined in vm_prot_t. */ #if defined(__x86_64__) #define VM_VALID_VMPROTECT_FLAGS (VM_PROT_ALL | VM_PROT_COPY | VM_PROT_UEXEC) #else #define VM_VALID_VMPROTECT_FLAGS (VM_PROT_ALL | VM_PROT_COPY) #endif /* * FOOTPRINT ACCOUNTING: * The "memory footprint" is better described in the pmap layer. * * At the VM level, these 2 vm_map_entry_t fields are relevant: * iokit_mapped: * For an "iokit_mapped" entry, we add the size of the entry to the * footprint when the entry is entered into the map and we subtract that * size when the entry is removed. No other accounting should take place. * "use_pmap" should be FALSE but is not taken into account. * use_pmap: (only when is_sub_map is FALSE) * This indicates if we should ask the pmap layer to account for pages * in this mapping. If FALSE, we expect that another form of accounting * is being used (e.g. "iokit_mapped" or the explicit accounting of * non-volatile purgable memory). * * So the logic is mostly: * if entry->is_sub_map == TRUE * anything in a submap does not count for the footprint * else if entry->iokit_mapped == TRUE * footprint includes the entire virtual size of this entry * else if entry->use_pmap == FALSE * tell pmap NOT to account for pages being pmap_enter()'d from this * mapping (i.e. use "alternate accounting") * else * pmap will account for pages being pmap_enter()'d from this mapping * as it sees fit (only if anonymous, etc...) */ #define VME_ALIAS_BITS 12 #define VME_ALIAS_MASK ((1u << VME_ALIAS_BITS) - 1) #define VME_OFFSET_SHIFT VME_ALIAS_BITS #define VME_OFFSET_BITS (64 - VME_ALIAS_BITS) #define VME_SUBMAP_SHIFT 2 #define VME_SUBMAP_BITS (sizeof(vm_offset_t) * 8 - VME_SUBMAP_SHIFT) struct vm_map_entry { struct vm_map_links links; /* links to other entries */ #define vme_next links.next #define vme_start links.start #define vme_end links.end struct vm_map_store store; union { vm_offset_t vme_object_value; struct { vm_offset_t vme_atomic:1; /* entry cannot be split/coalesced */ vm_offset_t is_sub_map:1; /* Is "object" a submap? */ vm_offset_t vme_submap:VME_SUBMAP_BITS; }; struct { uint32_t vme_ctx_atomic : 1; uint32_t vme_ctx_is_sub_map : 1; uint32_t vme_context : 30; /** * If vme_kernel_object==1 && KASAN, * vme_object_or_delta holds the delta. * * If vme_kernel_object==1 && !KASAN, * vme_tag_btref holds a btref when vme_alias is equal to the "vmtaglog" * boot-arg. * * If vme_kernel_object==0, * vme_object_or_delta holds the packed vm object. */ union { vm_page_object_t vme_object_or_delta; btref_t vme_tag_btref; }; }; }; unsigned long long /* vm_tag_t */ vme_alias:VME_ALIAS_BITS, /* entry VM tag */ /* vm_object_offset_t*/ vme_offset:VME_OFFSET_BITS, /* offset into object */ /* boolean_t */ is_shared:1, /* region is shared */ #if HAS_MTE /* boolean_t */ vme_is_tagged:1, /* region is mapped with tags */ #else /* !HAS_MTE */ /* boolean_t */__unused1:1, #endif /* HAS_MTE */ /* boolean_t */in_transition:1, /* Entry being changed */ /* boolean_t */ needs_wakeup:1, /* Waiters on in_transition */ /* behavior is not defined for submap type */ /* vm_behavior_t */ behavior:2, /* user paging behavior hint */ /* boolean_t */ needs_copy:1, /* object need to be copied? */ /* Only in task maps: */ #if defined(__arm64e__) /* * On ARM, the fourth protection bit is unused (UEXEC is x86_64 only). * We reuse it here to keep track of mappings that have hardware support * for read-only/read-write trusted paths. */ /* vm_prot_t-like */ protection:3, /* protection code */ /* boolean_t */ used_for_tpro:1, #else /* __arm64e__ */ /* vm_prot_t-like */protection:4, /* protection code, bit3=UEXEC */ #endif /* __arm64e__ */ /* vm_prot_t-like */ max_protection:4, /* maximum protection, bit3=UEXEC */ /* vm_inherit_t */ inheritance:2, /* inheritance */ /* * use_pmap is overloaded: * if "is_sub_map": * use a nested pmap? * else (i.e. if object): * use pmap accounting * for footprint? */ /* boolean_t */ use_pmap:1, /* boolean_t */ no_cache:1, /* should new pages be cached? */ /* boolean_t */ vme_permanent:1, /* mapping can not be removed */ /* boolean_t */ superpage_size:1, /* use superpages of a certain size */ /* * zero out the wired pages of this entry * if is being deleted without unwiring them */ /* boolean_t */ zero_wired_pages:1, /* boolean_t */ used_for_jit:1, /* boolean_t */ csm_associated:1, /* code signing monitor will validate */ /* iokit accounting: use the virtual size rather than resident size: */ /* boolean_t */ iokit_acct:1, /* boolean_t */ vme_resilient_codesign:1, /* boolean_t */ vme_resilient_media:1, /* boolean_t */ vme_xnu_user_debug:1, /* boolean_t */ vme_no_copy_on_read:1, /* boolean_t */ translated_allow_execute:1, /* execute in translated processes */ /* boolean_t */ vme_kernel_object:1, /* vme_object is a kernel_object */ /* boolean_t */ __unused:1; unsigned short wired_count; /* can be paged if = 0 */ unsigned short user_wired_count; /* for vm_wire */ #if DEBUG #define MAP_ENTRY_CREATION_DEBUG (1) #define MAP_ENTRY_INSERTION_DEBUG (1) #endif /* DEBUG */ #if MAP_ENTRY_CREATION_DEBUG struct vm_map_header *vme_creation_maphdr; uint32_t vme_creation_bt; /* btref_t */ #endif /* MAP_ENTRY_CREATION_DEBUG */ #if MAP_ENTRY_INSERTION_DEBUG uint32_t vme_insertion_bt; /* btref_t */ vm_map_offset_t vme_start_original; vm_map_offset_t vme_end_original; #endif /* MAP_ENTRY_INSERTION_DEBUG */ }; #define VME_ALIAS(entry) \ ((entry)->vme_alias) static inline vm_map_t _VME_SUBMAP( vm_map_entry_t entry) { __builtin_assume(entry->vme_submap); return (vm_map_t)(entry->vme_submap << VME_SUBMAP_SHIFT); } #define VME_SUBMAP(entry) ({ assert((entry)->is_sub_map); _VME_SUBMAP(entry); }) static inline void VME_SUBMAP_SET( vm_map_entry_t entry, vm_map_t submap) { __builtin_assume(((vm_offset_t)submap & 3) == 0); entry->is_sub_map = true; entry->vme_submap = (vm_offset_t)submap >> VME_SUBMAP_SHIFT; } static inline vm_object_t _VME_OBJECT( vm_map_entry_t entry) { vm_object_t object; if (!entry->vme_kernel_object) { object = VM_OBJECT_UNPACK(entry->vme_object_or_delta); __builtin_assume(!is_kernel_object(object)); } else { #if HAS_MTE object = entry->vme_is_tagged ? kernel_object_tagged : kernel_object_default; #else /* !HAS_MTE */ object = kernel_object_default; #endif /* HAS_MTE */ } return object; } #define VME_OBJECT(entry) ({ assert(!(entry)->is_sub_map); _VME_OBJECT(entry); }) static inline vm_object_offset_t VME_OFFSET( vm_map_entry_t entry) { return entry->vme_offset << VME_OFFSET_SHIFT; } #if (DEBUG || DEVELOPMENT) && !KASAN #define VM_BTLOG_TAGS 1 #else #define VM_BTLOG_TAGS 0 #endif /* * Convenience macros for dealing with superpages * SUPERPAGE_NBASEPAGES is architecture dependent and defined in pmap.h */ #define SUPERPAGE_SIZE (PAGE_SIZE*SUPERPAGE_NBASEPAGES) #define SUPERPAGE_MASK (-SUPERPAGE_SIZE) #define SUPERPAGE_ROUND_DOWN(a) (a & SUPERPAGE_MASK) #define SUPERPAGE_ROUND_UP(a) ((a + SUPERPAGE_SIZE-1) & SUPERPAGE_MASK) /* * wired_counts are unsigned short. This value is used to safeguard * against any mishaps due to runaway user programs. */ #define MAX_WIRE_COUNT 65535 typedef struct vm_map_user_range { vm_map_address_t vmur_min_address __kernel_data_semantics; vm_map_address_t vmur_max_address : 56 __kernel_data_semantics; vm_map_range_id_t vmur_range_id : 8; } *vm_map_user_range_t; /* * Type: vm_map_t [exported; contents invisible] * * Description: * An address map -- a directory relating valid * regions of a task's address space to the corresponding * virtual memory objects. * * Implementation: * Maps are doubly-linked lists of map entries, sorted * by address. One hint is used to start * searches again from the last successful search, * insertion, or removal. Another hint is used to * quickly find free space. * * Note: * vm_map_relocate_early_elem() knows about this layout, * and needs to be kept in sync. */ struct _vm_map { lck_rw_t lock; /* map lock */ struct vm_map_header hdr; /* Map entry header */ #define min_offset hdr.links.start /* start of range */ #define max_offset hdr.links.end /* end of range */ pmap_t XNU_PTRAUTH_SIGNED_PTR("_vm_map.pmap") pmap; /* Physical map */ vm_map_size_t size; /* virtual size */ uint64_t size_limit; /* rlimit on address space size */ uint64_t data_limit; /* rlimit on data size */ vm_map_size_t user_wire_limit;/* rlimit on user locked memory */ vm_map_size_t user_wire_size; /* current size of user locked memory in this map */ #if __x86_64__ vm_map_offset_t vmmap_high_start; #endif /* __x86_64__ */ os_ref_atomic_t map_refcnt; /* Reference count */ #if CONFIG_MAP_RANGES #define VM_MAP_EXTRA_RANGES_MAX 1024 struct mach_vm_range default_range; struct mach_vm_range data_range; struct mach_vm_range large_file_range; uint16_t extra_ranges_count; vm_map_user_range_t extra_ranges; #endif /* CONFIG_MAP_RANGES */ union { /* * If map->disable_vmentry_reuse == TRUE: * the end address of the highest allocated vm_map_entry_t. */ vm_map_offset_t vmu1_highest_entry_end; /* * For a nested VM map: * the lowest address in this nested VM map that we would * expect to be unnested under normal operation (i.e. for * regular copy-on-write on DATA section). */ vm_map_offset_t vmu1_lowest_unnestable_start; } vmu1; #define highest_entry_end vmu1.vmu1_highest_entry_end #define lowest_unnestable_start vmu1.vmu1_lowest_unnestable_start vm_map_entry_t hint; /* hint for quick lookups */ union { struct vm_map_links* vmmap_hole_hint; /* hint for quick hole lookups */ struct vm_map_corpse_footprint_header *vmmap_corpse_footprint; } vmmap_u_1; #define hole_hint vmmap_u_1.vmmap_hole_hint #define vmmap_corpse_footprint vmmap_u_1.vmmap_corpse_footprint union { vm_map_entry_t _first_free; /* First free space hint */ struct vm_map_links* _holes; /* links all holes between entries */ } f_s; /* Union for free space data structures being used */ #define first_free f_s._first_free #define holes_list f_s._holes unsigned int /* boolean_t */ wait_for_space:1, /* Should callers wait for space? */ /* boolean_t */ wiring_required:1, /* All memory wired? */ /* boolean_t */ no_zero_fill:1, /* No zero fill absent pages */ /* boolean_t */ mapped_in_other_pmaps:1, /* has this submap been mapped in maps that use a different pmap */ /* boolean_t */ switch_protect:1, /* Protect map from write faults while switched */ /* boolean_t */ disable_vmentry_reuse:1, /* All vm entries should keep using newer and higher addresses in the map */ /* boolean_t */ map_disallow_data_exec:1, /* Disallow execution from data pages on exec-permissive architectures */ /* boolean_t */ holelistenabled:1, /* boolean_t */ is_nested_map:1, /* boolean_t */ map_disallow_new_exec:1, /* Disallow new executable code */ /* boolean_t */ jit_entry_exists:1, /* boolean_t */ has_corpse_footprint:1, /* boolean_t */ terminated:1, /* boolean_t */ is_alien:1, /* for platform simulation, i.e. PLATFORM_IOS on OSX */ /* boolean_t */ cs_enforcement:1, /* code-signing enforcement */ /* boolean_t */ cs_debugged:1, /* code-signed but debugged */ /* boolean_t */ reserved_regions:1, /* has reserved regions. The map size that userspace sees should ignore these. */ /* boolean_t */ single_jit:1, /* only allow one JIT mapping */ /* boolean_t */ never_faults:1, /* this map should never cause faults */ /* boolean_t */ uses_user_ranges:1, /* has the map been configured to use user VM ranges */ /* boolean_t */ tpro_enforcement:1, /* enforce TPRO propagation */ /* boolean_t */ corpse_source:1, /* map is being used to create a corpse for diagnostics.*/ /* boolean_t */ cs_platform_binary:1, /* map belongs to a platform binary */ #define VM_MAP_NOT_SEALED 0 /* map is not sealed and may be freely modified. */ #define VM_MAP_WILL_BE_SEALED 1 /* map will be sealed and is subject to limited modification. */ #define VM_MAP_SEALED 2 /* map is sealed and should not be modified. */ /* unsigned int */ vmmap_sealed:2, /* sealed state of map, see definitions above. */ #if HAS_MTE || HAS_MTE_EMULATION_SHIMS /* boolean_t */ has_sec_access:1, /* offsets into this map may contain embedded pointer tags, whether or not they're enabled */ #else /* reserved */ res0:1, #endif /* HAS_MTE || HAS_MTE_EMULATION_SHIMS */ /* reserved */pad:6; unsigned int timestamp; /* Version number */ /* * Weak reference to the task that owns this map. This will be NULL if the * map has terminated, so you must have a task reference to be able to safely * access this. Under the map lock, you can safely acquire a task reference * if owning_task is not NULL, since vm_map_terminate requires the map lock. */ task_t owning_task; #if HAS_MTE /* * This is used to asynchronously deliver tag check faults to the owner * of a user vm_map when we take a tag check fault in a kernel thread with * its map switched. * * This variable starts zero-initialized. On such a tag check fault, we * atomically set the the address to the address where the fault occurred. * * When we vm_map_switch_back, we set AST_MACH_EXCEPTION on all of * owning_task's threads. * * Whichever thread consumes the AST first will atomically set the address * to VM_ASYNC_TAG_FAULT_ALREADY_REPORTED (which prevents vm_map_switch_back * from spuriously setting ASTs on the map) and throw a guard exception, * potentially (based on policy) killing owning_task. * * This field is not protected by the map lock. Readers/writers should hold * a map reference and access this value atomically. */ vm_map_offset_t async_tag_fault_address; #define VM_ASYNC_TAG_FAULT_ALREADY_REPORTED 0x1 #define VM_ASYNC_TAG_FAULT_MIN_VALID_ADDR (VM_ASYNC_TAG_FAULT_ALREADY_REPORTED + 1) #endif /* * A generation ID for maps that increments monotonically. * This is a pointer type just so we get dPAC out-of-the-box, but * conceptually it's just an ID. * Note that this is not a unique object ID. In particular, fork() * will produce a child map with the same ID as its parent. */ vm_map_serial_t serial_id; }; #define VME_PREV(entry) VM_PREV_UNPACK((entry)->links.prev) #define VMH_PREV(hdr) (VM_PREV_UNPACK((hdr)->links.prev)) #define VML_PREV(links) (VM_PREV_UNPACK((links)->prev)) static inline void VME_PREV_SET(vm_map_entry_t entry, vm_map_entry_t prev) { entry->links.prev = VM_PREV_PACK(prev); } static inline void VMH_PREV_SET(struct vm_map_header * hdr, vm_map_entry_t prev) { hdr->links.prev = VM_PREV_PACK(prev); } static inline void VML_PREV_SET(struct vm_map_links * links, vm_map_entry_t prev) { links->prev = VM_PREV_PACK(prev); } #define CAST_TO_VM_MAP_ENTRY(x) ((struct vm_map_entry *)(uintptr_t)(x)) #define vm_map_to_entry(map) CAST_TO_VM_MAP_ENTRY(&(map)->hdr.links) #define vm_map_first_entry(map) ((map)->hdr.links.next) #define vm_map_last_entry(map) (VME_PREV(vm_map_to_entry(map))) /* * Type: vm_map_version_t [exported; contents invisible] * * Description: * Map versions may be used to quickly validate a previous * lookup operation. * * Usage note: * Because they are bulky objects, map versions are usually * passed by reference. * * Implementation: * Just a timestamp for the main map. */ typedef struct vm_map_version { unsigned int main_timestamp; } vm_map_version_t; /* * Type: vm_map_copy_t [exported; contents invisible] * * Description: * A map copy object represents a region of virtual memory * that has been copied from an address map but is still * in transit. * * A map copy object may only be used by a single thread * at a time. * * Implementation: * There are two formats for map copy objects. * The first is very similar to the main * address map in structure, and as a result, some * of the internal maintenance functions/macros can * be used with either address maps or map copy objects. * * The map copy object contains a header links * entry onto which the other entries that represent * the region are chained. * * The second format is a kernel buffer copy object - for data * small enough that physical copies were the most efficient * method. This method uses a zero-sized array unioned with * other format-specific data in the 'c_u' member. This unsized * array overlaps the other elements and allows us to use this * extra structure space for physical memory copies. On 64-bit * systems this saves ~64 bytes per vm_map_copy. */ struct vm_map_copy { #define VM_MAP_COPY_ENTRY_LIST 1 #define VM_MAP_COPY_KERNEL_BUFFER 2 uint16_t type; bool is_kernel_range; bool is_user_range; vm_map_range_id_t orig_range; vm_object_offset_t offset; vm_map_size_t size; union { struct vm_map_header hdr; /* ENTRY_LIST */ struct { void *XNU_PTRAUTH_SIGNED_PTR("vm_map_copy.kdata") kdata; /* KERNEL_BUFFER */ #if HAS_MTE bool should_apply_mte_security_policy; #endif /* HAS_MTE */ } buffer_data; } c_u; }; ZONE_DECLARE_ID(ZONE_ID_VM_MAP_ENTRY, struct vm_map_entry); #define vm_map_entry_zone (&zone_array[ZONE_ID_VM_MAP_ENTRY]) ZONE_DECLARE_ID(ZONE_ID_VM_MAP_HOLES, struct vm_map_links); #define vm_map_holes_zone (&zone_array[ZONE_ID_VM_MAP_HOLES]) ZONE_DECLARE_ID(ZONE_ID_VM_MAP, struct _vm_map); #define vm_map_zone (&zone_array[ZONE_ID_VM_MAP]) #define cpy_hdr c_u.hdr #define cpy_kdata c_u.buffer_data.kdata #if HAS_MTE #define cpy_should_apply_mte_security_policy c_u.buffer_data.should_apply_mte_security_policy #endif /* HAS_MTE */ #define VM_MAP_COPY_PAGE_SHIFT(copy) ((copy)->cpy_hdr.page_shift) #define VM_MAP_COPY_PAGE_SIZE(copy) (1 << VM_MAP_COPY_PAGE_SHIFT((copy))) #define VM_MAP_COPY_PAGE_MASK(copy) (VM_MAP_COPY_PAGE_SIZE((copy)) - 1) /* * Useful macros for entry list copy objects */ #define vm_map_copy_to_entry(copy) CAST_TO_VM_MAP_ENTRY(&(copy)->cpy_hdr.links) #define vm_map_copy_first_entry(copy) \ ((copy)->cpy_hdr.links.next) #define vm_map_copy_last_entry(copy) \ (VM_PREV_UNPACK((copy)->cpy_hdr.links.prev)) /* * Macros: vm_map_lock, etc. [internal use only] * Description: * Perform locking on the data portion of a map. * When multiple maps are to be locked, order by map address. * (See vm_map.c::vm_remap()) */ #include <vm/vm_lock_perf.h> #define vm_map_lock_init(map) \ ((map)->timestamp = 0 , \ lck_rw_init(&(map)->lock, &vm_map_lck_grp, &vm_map_lck_rw_attr)) #define vm_map_lock(map) \ MACRO_BEGIN \ DTRACE_VM(vm_map_lock_w); \ vmlp_lock_event_unlocked(VMLP_EVENT_LOCK_REQ_EXCL, map); \ assert(!vm_map_is_sealed(map)); \ lck_rw_lock_exclusive(&(map)->lock); \ vmlp_lock_event_locked(VMLP_EVENT_LOCK_GOT_EXCL, map); \ MACRO_END #define vm_map_lock_unseal(map) \ MACRO_BEGIN \ DTRACE_VM(vm_map_lock_w); \ assert(vm_map_is_sealed(map)); \ lck_rw_lock_exclusive(&(map)->lock); \ (map)->vmmap_sealed = VM_MAP_NOT_SEALED; \ MACRO_END #define vm_map_unlock(map) \ MACRO_BEGIN \ DTRACE_VM(vm_map_unlock_w); \ vmlp_lock_event_locked(VMLP_EVENT_LOCK_UNLOCK_EXCL, map); \ assert(!vm_map_is_sealed(map)); \ (map)->timestamp++; \ lck_rw_done(&(map)->lock); \ MACRO_END #define vm_map_lock_read(map) \ MACRO_BEGIN \ DTRACE_VM(vm_map_lock_r); \ vmlp_lock_event_unlocked(VMLP_EVENT_LOCK_REQ_SH, map); \ lck_rw_lock_shared(&(map)->lock); \ vmlp_lock_event_locked(VMLP_EVENT_LOCK_GOT_SH, map); \ MACRO_END #define vm_map_unlock_read(map) \ MACRO_BEGIN \ DTRACE_VM(vm_map_unlock_r); \ vmlp_lock_event_locked(VMLP_EVENT_LOCK_UNLOCK_SH, map); \ lck_rw_done(&(map)->lock); \ MACRO_END #define vm_map_lock_write_to_read(map) \ MACRO_BEGIN \ DTRACE_VM(vm_map_lock_downgrade); \ vmlp_lock_event_locked(VMLP_EVENT_LOCK_DOWNGRADE, map); \ (map)->timestamp++; \ lck_rw_lock_exclusive_to_shared(&(map)->lock); \ MACRO_END #define vm_map_lock_assert_held(map) \ LCK_RW_ASSERT(&(map)->lock, LCK_RW_ASSERT_HELD) #define vm_map_lock_assert_shared(map) \ LCK_RW_ASSERT(&(map)->lock, LCK_RW_ASSERT_SHARED) #define vm_map_lock_assert_exclusive(map) \ LCK_RW_ASSERT(&(map)->lock, LCK_RW_ASSERT_EXCLUSIVE) #define vm_map_lock_assert_notheld(map) \ LCK_RW_ASSERT(&(map)->lock, LCK_RW_ASSERT_NOTHELD) /* * Exported procedures that operate on vm_map_t. */ /* Lookup map entry containing or the specified address in the given map */ extern boolean_t vm_map_lookup_entry( vm_map_t map, vm_map_address_t address, vm_map_entry_t *entry); /* OUT */ /* * Functions implemented as macros */ #define vm_map_min(map) ((map)->min_offset) /* Lowest valid address in * a map */ #define vm_map_max(map) ((map)->max_offset) /* Highest valid address */ #define vm_map_pmap(map) ((map)->pmap) /* Physical map associated * with this address map */ /* Gain a reference to an existing map */ extern void vm_map_reference( vm_map_t map); /* * Wait and wakeup macros for in_transition map entries. */ static inline wait_result_t _vm_map_entry_wait_helper(vm_map_t map, wait_interrupt_t interruptible) { vmlp_lock_event_locked(VMLP_EVENT_LOCK_SLEEP_BEGIN, map); map->timestamp++; wait_result_t res = lck_rw_sleep(&map->lock, LCK_SLEEP_EXCLUSIVE | LCK_SLEEP_PROMOTED_PRI, (event_t)&map->hdr, interruptible); vmlp_lock_event_locked(VMLP_EVENT_LOCK_SLEEP_END, map); return res; } #define vm_map_entry_wait(map, interruptible) _vm_map_entry_wait_helper((map), (interruptible)) #define vm_map_entry_wakeup(map) \ thread_wakeup((event_t)(&(map)->hdr)) extern void vm_map_inherit_limits( vm_map_t new_map, const struct _vm_map *old_map); /* Create a new task map using an existing task map as a template. */ extern vm_map_t vm_map_fork( ledger_t ledger, vm_map_t old_map, int options); #if HAS_MTE /* * WARNING: VM_MAP_FORK_SHARE_IF_INHERIT_NONE and VM_MAP_FORK_SHARE_IF_OWNED * allow fork() to create shared mappings of MTE-tagged memory, which is * generally forbidden. * * Currently, these flags are used only in the corpse-fork path, which is * safe because neither the process nor the corpse continue running, but future * callers should be careful. */ #endif /* HAS_MTE */ #define VM_MAP_FORK_SHARE_IF_INHERIT_NONE 0x00000001 #define VM_MAP_FORK_PRESERVE_PURGEABLE 0x00000002 #define VM_MAP_FORK_CORPSE_FOOTPRINT 0x00000004 #define VM_MAP_FORK_SHARE_IF_OWNED 0x00000008 extern kern_return_t vm_map_query_volatile( vm_map_t map, mach_vm_size_t *volatile_virtual_size_p, mach_vm_size_t *volatile_resident_size_p, mach_vm_size_t *volatile_compressed_size_p, mach_vm_size_t *volatile_pmap_size_p, mach_vm_size_t *volatile_compressed_pmap_size_p); extern kern_return_t vm_map_set_cache_attr( vm_map_t map, vm_map_offset_t va); extern void vm_map_copy_footprint_ledgers( task_t old_task, task_t new_task); /** * Represents a single region of virtual address space that should be reserved * (pre-mapped) in a user address space. */ struct vm_reserved_region { const char *vmrr_name; vm_map_offset_t vmrr_addr; vm_map_size_t vmrr_size; }; /** * Return back a machine-dependent array of address space regions that should be * reserved by the VM. This function is defined in the machine-dependent * machine_routines.c files. */ extern size_t ml_get_vm_reserved_regions( bool vm_is64bit, const struct vm_reserved_region **regions); /** * Explicitly preallocates a floating point save area. This function is defined * in the machine-dependent machine_routines.c files. */ extern void ml_fp_save_area_prealloc(void); extern bool vm_map_is_sealed( vm_map_t map); #endif /* MACH_KERNEL_PRIVATE */ /* * Read and write from a kernel buffer to a specified map. */ extern kern_return_t vm_map_write_user( vm_map_t map, void *src_p, vm_map_offset_ut dst_addr_u, vm_size_ut size_u); extern kern_return_t vm_map_read_user( vm_map_t map, vm_map_offset_ut src_addr_u, void *dst_p, vm_size_ut size_u); extern vm_map_size_t vm_map_adjusted_size(vm_map_t map); typedef struct { vm_map_t map; task_t task; boolean_t sec_overridden; } vm_map_switch_context_t; extern vm_map_switch_context_t vm_map_switch_with_sec_override(vm_map_t, boolean_t sec_override); static inline vm_map_switch_context_t vm_map_switch_to(vm_map_t map) { return vm_map_switch_with_sec_override(map, FALSE); } extern void vm_map_switch_back(vm_map_switch_context_t ctx); extern boolean_t vm_map_cs_enforcement( vm_map_t map); extern void vm_map_cs_enforcement_set( vm_map_t map, boolean_t val); extern void vm_map_cs_debugged_set( vm_map_t map, boolean_t val); extern kern_return_t vm_map_cs_wx_enable(vm_map_t map); extern kern_return_t vm_map_csm_allow_jit(vm_map_t map); extern void vm_map_will_allocate_early_map( vm_map_t *map_owner); extern void vm_map_relocate_early_maps( vm_offset_t delta); extern void vm_map_relocate_early_elem( uint32_t zone_id, vm_offset_t new_addr, vm_offset_t delta); /* wire down a region */ /* never fails */ extern vm_map_t vm_map_create_options( pmap_t pmap, vm_map_offset_t min_off, vm_map_offset_t max_off, vm_map_create_options_t options); extern boolean_t vm_kernel_map_is_kernel(vm_map_t map); /*! * @function vm_map_enter_mem_object_control() * * @brief * Enters a mapping of @c initial_size bytes at @c *address (subject to * fixed/anywhere semantics, see @c VM_FLAGS_FIXED/VM_FLAGS_ANYWHERE ). * The pages will come from a memory object paged in by the @c control pager, * and the caller may specify an @c offset into the object. * * @param target_map The map into which to enter the mapping. * @param address [in] Pointer to the address at which to enter the * mapping (or use as a hint for anywhere * mappings). * No alignment is required, the function will * round this down to a page boundary in the * @c target_map. * [out] On success, it will be filled with the address * at which the object data is made available, and * will have the same misalignment into * @c target_map as @c offset. * On failure, it remains unmodified. * @param initial_size Size of the mapping to enter. * Must be non-zero. * No alignment is required. * @param mask An alignment mask the mapping must respect. * @param vmk_flags The vm map kernel flags to influence this call. * @param control The pager-managed memory object which is the source * of the pages. * @param offset The offset into the memory object to use when * paging. * @c vm_map_enter, which is called into by * @c vm_map_enter_mem_object_control, requires that * @c offset be page-aligned for either @c target_map * pages or kernel pages. * @param needs_copy Boolean which can be set to request that the mapped * pages be a copy of the memory object's pages. * @param cur_protection Effective protection that should be set for the * mapping. * @param max_protection Max protection that should be allowed for the * mapping. Should at least cover @c cur_protection. * @param inheritance Inheritance policy for the mapping. * * @returns @c KERN_SUCCESS if the mapping was successfully entered, an error * code otherwise. */ extern kern_return_t vm_map_enter_mem_object_control( vm_map_t target_map, vm_map_offset_ut *address, vm_map_size_ut initial_size, vm_map_offset_ut mask, vm_map_kernel_flags_t vmk_flags, memory_object_control_t control, vm_object_offset_ut offset, boolean_t needs_copy, vm_prot_ut cur_protection, vm_prot_ut max_protection, vm_inherit_ut inheritance); /* Must be executed on a new task's map before the task is enabled for IPC access */ extern void vm_map_setup(vm_map_t map, task_t task); /* always succeeds */ extern kern_return_t vm_map_terminate( vm_map_t map); /* Overwrite existing memory with a copy */ extern kern_return_t vm_map_copy_overwrite( vm_map_t dst_map, vm_map_address_ut dst_addr_u, vm_map_copy_t copy, vm_map_size_ut copy_size_u, #if HAS_MTE boolean_t sec_override, #endif boolean_t interruptible); /* returns TRUE if size of vm_map_copy == *size, FALSE otherwise */ extern boolean_t vm_map_copy_validate_size( vm_map_t dst_map, vm_map_copy_t copy, vm_map_size_t *size); extern kern_return_t vm_map_copyout_size( vm_map_t dst_map, vm_map_address_t *dst_addr, /* OUT */ vm_map_copy_t copy, vm_map_size_ut copy_size); extern void vm_map_disable_NX( vm_map_t map); extern void vm_map_disallow_data_exec( vm_map_t map); extern void vm_map_set_64bit( vm_map_t map); extern void vm_map_set_32bit( vm_map_t map); extern void vm_map_set_jumbo( vm_map_t map); #if XNU_PLATFORM_iPhoneOS && EXTENDED_USER_VA_SUPPORT extern void vm_map_set_extra_jumbo( vm_map_t map); #endif /* XNU_PLATFORM_iPhoneOS && EXTENDED_USER_VA_SUPPORT */ extern void vm_map_set_jit_entitled( vm_map_t map); extern void vm_map_set_max_addr( vm_map_t map, vm_map_offset_t new_max_offset, bool extra_jumbo); extern boolean_t vm_map_has_hard_pagezero( vm_map_t map, vm_map_offset_t pagezero_size); extern void vm_commit_pagezero_status(vm_map_t tmap); extern void vm_map_set_platform_binary( vm_map_t map, bool is_platform_binary); extern bool vm_map_is_platform_binary( vm_map_t map); extern boolean_t vm_map_tpro( vm_map_t map); extern void vm_map_set_tpro( vm_map_t map); #if HAS_MTE || HAS_MTE_EMULATION_SHIMS extern void vm_map_set_sec_enabled( vm_map_t map); extern void vm_map_set_sec_disabled( vm_map_t map); extern vm_map_address_t vm_map_strip_addr( vm_map_t map, vm_map_address_t ptr); #endif /* HAS_MTE || HAS_MTE_EMULATION_SHIMS */ #if HAS_MTE extern void vm_map_set_restrict_receiving_aliases_to_tagged_memory( vm_map_t map, bool must_restrict); #endif /* HAS_MTE */ extern void vm_map_set_tpro_enforcement( vm_map_t map); extern boolean_t vm_map_set_tpro_range( vm_map_t map, vm_map_address_t start, vm_map_address_t end); extern boolean_t vm_map_is_64bit( vm_map_t map); extern kern_return_t vm_map_raise_max_offset( vm_map_t map, vm_map_offset_t new_max_offset); extern kern_return_t vm_map_raise_min_offset( vm_map_t map, vm_map_offset_t new_min_offset); #if XNU_TARGET_OS_OSX extern void vm_map_set_high_start( vm_map_t map, vm_map_offset_t high_start); #endif /* XNU_TARGET_OS_OSX */ extern vm_map_offset_t vm_compute_max_offset( boolean_t is64); extern void vm_map_get_max_aslr_slide_section( vm_map_t map, int64_t *max_sections, int64_t *section_size); extern uint64_t vm_map_get_max_aslr_slide_pages( vm_map_t map); extern uint64_t vm_map_get_max_loader_aslr_slide_pages( vm_map_t map); extern kern_return_t vm_map_set_size_limit( vm_map_t map, uint64_t limit); extern kern_return_t vm_map_set_data_limit( vm_map_t map, uint64_t limit); extern void vm_map_set_user_wire_limit( vm_map_t map, vm_size_t limit); extern void vm_map_switch_protect( vm_map_t map, boolean_t val); extern boolean_t vm_map_page_aligned( vm_map_offset_t offset, vm_map_offset_t mask); extern bool vm_map_range_overflows( vm_map_t map, vm_map_offset_t addr, vm_map_size_t size); /* Support for vm_map ranges */ extern kern_return_t vm_map_range_configure( vm_map_t map, bool needs_extra_jumbo_va); /*! * @function vm_map_kernel_flags_update_range_id() * * @brief * Updates the @c vmkf_range_id field with the adequate value * according to the policy for specified map and tag set in @c vmk_flags. * * @discussion * This function is meant to be called by Mach VM entry points, * which matters for the kernel: allocations with pointers _MUST_ * be allocated with @c kmem_*() functions. * * If the range ID is already set, it is preserved. */ extern void vm_map_kernel_flags_update_range_id( vm_map_kernel_flags_t *flags, vm_map_t map, vm_map_size_t size); #if XNU_TARGET_OS_OSX extern void vm_map_mark_alien(vm_map_t map); extern void vm_map_single_jit(vm_map_t map); #endif /* XNU_TARGET_OS_OSX */ extern kern_return_t vm_map_page_info( vm_map_t map, vm_map_offset_ut offset, vm_page_info_flavor_t flavor, vm_page_info_t info, mach_msg_type_number_t *count); extern kern_return_t vm_map_page_range_info_internal( vm_map_t map, vm_map_offset_ut start_offset, vm_map_offset_ut end_offset, int effective_page_shift, vm_page_info_flavor_t flavor, vm_page_info_t info, mach_msg_type_number_t *count); #ifdef MACH_KERNEL_PRIVATE /* * Internal macros for rounding and truncation of vm_map offsets and sizes */ #define VM_MAP_ROUND_PAGE(x, pgmask) (((vm_map_offset_t)(x) + (pgmask)) & ~((signed)(pgmask))) #define VM_MAP_TRUNC_PAGE(x, pgmask) ((vm_map_offset_t)(x) & ~((signed)(pgmask))) /* * Macros for rounding and truncation of vm_map offsets and sizes */ static inline int VM_MAP_PAGE_SHIFT( vm_map_t map) { int shift = map ? map->hdr.page_shift : PAGE_SHIFT; /* * help ubsan and codegen in general, * cannot use PAGE_{MIN,MAX}_SHIFT * because of testing code which * tests 16k aligned maps on 4k only systems. */ __builtin_assume(shift >= 12 && shift <= 14); return shift; } #define VM_MAP_PAGE_SIZE(map) (1 << VM_MAP_PAGE_SHIFT((map))) #define VM_MAP_PAGE_MASK(map) (VM_MAP_PAGE_SIZE((map)) - 1) #define VM_MAP_PAGE_ALIGNED(x, pgmask) (((x) & (pgmask)) == 0) #endif /* MACH_KERNEL_PRIVATE */ extern kern_return_t vm_map_set_page_shift(vm_map_t map, int pageshift); extern bool vm_map_is_exotic(vm_map_t map); extern bool vm_map_is_alien(vm_map_t map); extern pmap_t vm_map_get_pmap(vm_map_t map); extern void vm_map_guard_exception(vm_map_offset_t gap_start, unsigned reason); extern bool vm_map_is_corpse_source(vm_map_t map); extern void vm_map_set_corpse_source(vm_map_t map); extern void vm_map_unset_corpse_source(vm_map_t map); #if HAS_MTE || HAS_MTE_EMULATION_SHIMS extern bool vm_map_has_sec_access(vm_map_t map); extern void vm_map_mark_has_sec_access_locked(vm_map_t map); #if CONFIG_XNUPOST extern void vm_map_mark_has_sec_access(vm_map_t map); extern void vm_map_remove_sec_access(vm_map_t map); #endif /* CONFIG_XNUPOST */ #endif /* HAS_MTE || HAS_MTE_EMULATION_SHIMS */ #if CONFIG_DYNAMIC_CODE_SIGNING extern kern_return_t vm_map_sign(vm_map_t map, vm_map_offset_t start, vm_map_offset_t end); #endif /* CONFIG_DYNAMIC_CODE_SIGNING */ #if CONFIG_FREEZE extern kern_return_t vm_map_freeze( task_t task, unsigned int *purgeable_count, unsigned int *wired_count, unsigned int *clean_count, unsigned int *dirty_count, unsigned int dirty_budget, unsigned int *shared_count, int *freezer_error_code, boolean_t eval_only); __enum_decl(freezer_error_code_t, int, { FREEZER_ERROR_GENERIC = -1, FREEZER_ERROR_EXCESS_SHARED_MEMORY = -2, FREEZER_ERROR_LOW_PRIVATE_SHARED_RATIO = -3, FREEZER_ERROR_NO_COMPRESSOR_SPACE = -4, FREEZER_ERROR_NO_SWAP_SPACE = -5, FREEZER_ERROR_NO_SLOTS = -6, }); #endif /* CONFIG_FREEZE */ extern kern_return_t vm_map_partial_reap( vm_map_t map, unsigned int *reclaimed_resident, unsigned int *reclaimed_compressed); /* * In some cases, we don't have a real VM object but still want to return a * unique ID (to avoid a memory region looking like shared memory), so build * a fake pointer based on the map's ledger and the index of the ledger being * reported. */ #define VM_OBJECT_ID_FAKE(map, ledger_id) ((uint32_t)(uintptr_t)VM_KERNEL_ADDRHASH((int*)((map)->pmap->ledger)+(ledger_id))) #if DEVELOPMENT || DEBUG extern int vm_map_disconnect_page_mappings( vm_map_t map, boolean_t); extern kern_return_t vm_map_inject_error(vm_map_t map, vm_map_offset_t vaddr); extern kern_return_t vm_map_entries_foreach(vm_map_t map, kern_return_t (^count_handler)(int nentries), kern_return_t (^entry_handler)(void* entry)); extern kern_return_t vm_map_dump_entry_and_compressor_pager(void* entry, char *buf, size_t *count); extern void vm_map_testing_make_sealed_submap( vm_map_t parent_map, mach_vm_address_t start, mach_vm_address_t end); extern void vm_map_testing_remap_submap( vm_map_t parent_map, mach_vm_address_t submap_base_address, mach_vm_address_t start, mach_vm_address_t end, mach_vm_address_t offset); #endif /* DEVELOPMENT || DEBUG */ boolean_t kdp_vm_map_is_acquired_exclusive(vm_map_t map); boolean_t vm_map_entry_has_device_pager(vm_map_t, vm_map_offset_t vaddr); #ifdef VM_SCAN_FOR_SHADOW_CHAIN int vm_map_shadow_max(vm_map_t map); #endif bool vm_map_is_map_size_valid(vm_map_t target_map, vm_size_t size, bool no_soft_limit); /* Returns the map's ID or VM_MAP_SERIAL_NONE if the input map is NULL */ vm_map_serial_t vm_map_maybe_serial_id(vm_map_t maybe_vm_map); __END_DECLS #endif /* XNU_KERNEL_PRIVATE */ #endif /* _VM_VM_MAP_XNU_H_ */ |