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kalloc.c
3659 lines (3218 loc) · 94.1 KB
/
kalloc.c
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/*
* Copyright (c) 2000-2021 Apple Computer, Inc. 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@
*/
/*
* @OSF_COPYRIGHT@
*/
/*
* Mach Operating System
* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
*/
/*
* File: kern/kalloc.c
* Author: Avadis Tevanian, Jr.
* Date: 1985
*
* General kernel memory allocator. This allocator is designed
* to be used by the kernel to manage dynamic memory fast.
*/
#include "mach/vm_types.h"
#include <mach/boolean.h>
#include <mach/sdt.h>
#include <mach/machine/vm_types.h>
#include <mach/vm_param.h>
#include <kern/misc_protos.h>
#include <kern/counter.h>
#include <kern/zalloc_internal.h>
#include <kern/kalloc.h>
#include <kern/ledger.h>
#include <kern/backtrace.h>
#include <vm/vm_kern.h>
#include <vm/vm_object.h>
#include <vm/vm_map.h>
#include <vm/vm_memtag.h>
#include <sys/kdebug.h>
#include <os/hash.h>
#include <san/kasan.h>
#include <libkern/section_keywords.h>
#include <libkern/prelink.h>
SCALABLE_COUNTER_DEFINE(kalloc_large_count);
SCALABLE_COUNTER_DEFINE(kalloc_large_total);
#pragma mark initialization
/*
* All allocations of size less than KHEAP_MAX_SIZE are rounded to the next nearest
* sized zone. This allocator is built on top of the zone allocator. A zone
* is created for each potential size that we are willing to get in small
* blocks.
*
* Allocations of size greater than KHEAP_MAX_SIZE, are allocated from the VM.
*/
/*
* The kt_zone_cfg table defines the configuration of zones on various
* platforms for kalloc_type fixed size allocations.
*/
#if KASAN_CLASSIC
#define K_SIZE_CLASS(size) \
(((size) & PAGE_MASK) == 0 ? (size) : \
((size) <= 1024 ? (size) : (size) - KASAN_GUARD_SIZE))
#else
#define K_SIZE_CLASS(size) (size)
#endif
static_assert(K_SIZE_CLASS(KHEAP_MAX_SIZE) == KHEAP_MAX_SIZE);
static const uint16_t kt_zone_cfg[] = {
K_SIZE_CLASS(16),
K_SIZE_CLASS(32),
K_SIZE_CLASS(48),
K_SIZE_CLASS(64),
K_SIZE_CLASS(80),
K_SIZE_CLASS(96),
K_SIZE_CLASS(128),
K_SIZE_CLASS(160),
K_SIZE_CLASS(192),
K_SIZE_CLASS(224),
K_SIZE_CLASS(256),
K_SIZE_CLASS(288),
K_SIZE_CLASS(368),
K_SIZE_CLASS(400),
K_SIZE_CLASS(512),
K_SIZE_CLASS(576),
K_SIZE_CLASS(768),
K_SIZE_CLASS(1024),
K_SIZE_CLASS(1152),
K_SIZE_CLASS(1280),
K_SIZE_CLASS(1664),
K_SIZE_CLASS(2048),
K_SIZE_CLASS(4096),
K_SIZE_CLASS(6144),
K_SIZE_CLASS(8192),
K_SIZE_CLASS(12288),
K_SIZE_CLASS(16384),
#if __arm64__
K_SIZE_CLASS(24576),
K_SIZE_CLASS(32768),
#endif /* __arm64__ */
};
#define MAX_K_ZONE(kzc) (uint32_t)(sizeof(kzc) / sizeof(kzc[0]))
/*
* kalloc_type callsites are assigned a zone during early boot. They
* use the dlut[] (direct lookup table), indexed by size normalized
* to the minimum alignment to find the right zone index quickly.
*/
#define INDEX_ZDLUT(size) (((size) + KALLOC_MINALIGN - 1) / KALLOC_MINALIGN)
#define KALLOC_DLUT_SIZE (KHEAP_MAX_SIZE / KALLOC_MINALIGN)
#define MAX_SIZE_ZDLUT ((KALLOC_DLUT_SIZE - 1) * KALLOC_MINALIGN)
static __startup_data uint8_t kalloc_type_dlut[KALLOC_DLUT_SIZE];
static __startup_data uint32_t kheap_zsize[KHEAP_NUM_ZONES];
#if VM_TAG_SIZECLASSES
static_assert(VM_TAG_SIZECLASSES >= MAX_K_ZONE(kt_zone_cfg));
#endif
const char * const kalloc_heap_names[] = {
[KHEAP_ID_NONE] = "",
[KHEAP_ID_SHARED] = "shared.",
[KHEAP_ID_DATA_BUFFERS] = "data.",
[KHEAP_ID_KT_VAR] = "",
};
/*
* Shared heap configuration
*/
SECURITY_READ_ONLY_LATE(struct kalloc_heap) KHEAP_SHARED[1] = {
{
.kh_name = "shared.kalloc",
.kh_heap_id = KHEAP_ID_SHARED,
.kh_tag = VM_KERN_MEMORY_KALLOC_TYPE,
}
};
/*
* Bag of bytes heap configuration
*/
SECURITY_READ_ONLY_LATE(struct kalloc_heap) KHEAP_DATA_BUFFERS[1] = {
{
.kh_name = "data.kalloc",
.kh_heap_id = KHEAP_ID_DATA_BUFFERS,
.kh_tag = VM_KERN_MEMORY_KALLOC_DATA,
}
};
/*
* Configuration of variable kalloc type heaps
*/
SECURITY_READ_ONLY_LATE(struct kheap_info)
kalloc_type_heap_array[KT_VAR_MAX_HEAPS] = {};
SECURITY_READ_ONLY_LATE(struct kalloc_heap) KHEAP_KT_VAR[1] = {
{
.kh_name = "kalloc.type.var",
.kh_heap_id = KHEAP_ID_KT_VAR,
.kh_tag = VM_KERN_MEMORY_KALLOC_TYPE
}
};
KALLOC_HEAP_DEFINE(KHEAP_DEFAULT, "KHEAP_DEFAULT", KHEAP_ID_KT_VAR);
__startup_func
static void
kalloc_zsize_compute(void)
{
uint32_t step = KHEAP_STEP_START;
uint32_t size = KHEAP_START_SIZE;
/*
* Manually initialize extra initial zones
*/
kheap_zsize[0] = size / 2;
kheap_zsize[1] = size;
static_assert(KHEAP_EXTRA_ZONES == 2);
/*
* Compute sizes for remaining zones
*/
for (uint32_t i = 0; i < KHEAP_NUM_STEPS; i++) {
uint32_t step_idx = (i * 2) + KHEAP_EXTRA_ZONES;
kheap_zsize[step_idx] = K_SIZE_CLASS(size + step);
kheap_zsize[step_idx + 1] = K_SIZE_CLASS(size + 2 * step);
step *= 2;
size += step;
}
}
static zone_t
kalloc_zone_for_size_with_flags(
zone_id_t zid,
vm_size_t size,
zalloc_flags_t flags)
{
vm_size_t max_size = KHEAP_MAX_SIZE;
bool forcopyin = flags & Z_MAY_COPYINMAP;
zone_t zone;
if (flags & Z_KALLOC_ARRAY) {
size = roundup(size, KALLOC_ARRAY_GRANULE);
}
if (forcopyin) {
#if __x86_64__
/*
* On Intel, the OSData() ABI used to allocate
* from the kernel map starting at PAGE_SIZE.
*
* If only vm_map_copyin() or a wrapper is used,
* then everything will work fine because vm_map_copy_t
* will perform an actual copy if the data is smaller
* than msg_ool_size_small (== KHEAP_MAX_SIZE).
*
* However, if anyone is trying to call mach_vm_remap(),
* then bad things (TM) happen.
*
* Avoid this by preserving the ABI and moving
* to kalloc_large() earlier.
*
* Any recent code really ought to use IOMemoryDescriptor
* for this purpose however.
*/
max_size = PAGE_SIZE - 1;
#endif
}
if (size <= max_size) {
uint32_t idx;
if (size <= KHEAP_START_SIZE) {
zid += (size > 16);
} else {
/*
* . log2down(size - 1) is log2up(size) - 1
* . (size - 1) >> (log2down(size - 1) - 1)
* is either 0x2 or 0x3
*/
idx = kalloc_log2down((uint32_t)(size - 1));
zid += KHEAP_EXTRA_ZONES +
2 * (idx - KHEAP_START_IDX) +
((uint32_t)(size - 1) >> (idx - 1)) - 2;
}
zone = zone_by_id(zid);
#if KASAN_CLASSIC
/*
* Under kasan classic, certain size classes are a redzone
* away from the mathematical formula above, and we need
* to "go to the next zone".
*
* Because the KHEAP_MAX_SIZE bucket _does_ exist however,
* this will never go to an "invalid" zone that doesn't
* belong to the kheap.
*/
if (size > zone_elem_inner_size(zone)) {
zone++;
}
#endif
return zone;
}
return ZONE_NULL;
}
zone_t
kalloc_zone_for_size(zone_id_t zid, size_t size)
{
return kalloc_zone_for_size_with_flags(zid, size, Z_WAITOK);
}
static inline bool
kheap_size_from_zone(
void *addr,
vm_size_t size,
zalloc_flags_t flags)
{
vm_size_t max_size = KHEAP_MAX_SIZE;
bool forcopyin = flags & Z_MAY_COPYINMAP;
#if __x86_64__
/*
* If Z_FULLSIZE is used, then due to kalloc_zone_for_size_with_flags()
* behavior, then the element could have a PAGE_SIZE reported size,
* yet still be from a zone for Z_MAY_COPYINMAP.
*/
if (forcopyin) {
if (size == PAGE_SIZE &&
zone_id_for_element(addr, size) != ZONE_ID_INVALID) {
return true;
}
max_size = PAGE_SIZE - 1;
}
#else
#pragma unused(addr, forcopyin)
#endif
return size <= max_size;
}
/*
* All data zones shouldn't use shared zone. Therefore set the no share
* bit right after creation.
*/
__startup_func
static void
kalloc_set_no_share_for_data(
zone_kheap_id_t kheap_id,
zone_stats_t zstats)
{
if (kheap_id == KHEAP_ID_DATA_BUFFERS) {
zpercpu_foreach(zs, zstats) {
os_atomic_store(&zs->zs_alloc_not_shared, 1, relaxed);
}
}
}
__startup_func
static void
kalloc_zone_init(
const char *kheap_name,
zone_kheap_id_t kheap_id,
zone_id_t *kheap_zstart,
zone_create_flags_t zc_flags)
{
zc_flags |= ZC_PGZ_USE_GUARDS;
for (uint32_t i = 0; i < KHEAP_NUM_ZONES; i++) {
uint32_t size = kheap_zsize[i];
char buf[MAX_ZONE_NAME], *z_name;
int len;
len = scnprintf(buf, MAX_ZONE_NAME, "%s.%u", kheap_name, size);
z_name = zalloc_permanent(len + 1, ZALIGN_NONE);
strlcpy(z_name, buf, len + 1);
(void)zone_create_ext(z_name, size, zc_flags, ZONE_ID_ANY, ^(zone_t z){
#if __arm64e__ || CONFIG_KERNEL_TAGGING
uint32_t scale = kalloc_log2down(size / 32);
if (size == 32 << scale) {
z->z_array_size_class = scale;
} else {
z->z_array_size_class = scale | 0x10;
}
#endif
zone_security_array[zone_index(z)].z_kheap_id = kheap_id;
if (i == 0) {
*kheap_zstart = zone_index(z);
}
kalloc_set_no_share_for_data(kheap_id, z->z_stats);
});
}
}
__startup_func
static void
kalloc_heap_init(struct kalloc_heap *kheap)
{
kalloc_zone_init("kalloc", kheap->kh_heap_id, &kheap->kh_zstart,
ZC_NONE);
/*
* Count all the "raw" views for zones in the heap.
*/
zone_view_count += KHEAP_NUM_ZONES;
}
#define KEXT_ALIGN_SHIFT 6
#define KEXT_ALIGN_BYTES (1<< KEXT_ALIGN_SHIFT)
#define KEXT_ALIGN_MASK (KEXT_ALIGN_BYTES-1)
#define kt_scratch_size (256ul << 10)
#define KALLOC_TYPE_SECTION(type) \
(type == KTV_FIXED? "__kalloc_type": "__kalloc_var")
/*
* Enum to specify the kalloc_type variant being used.
*/
__options_decl(kalloc_type_variant_t, uint16_t, {
KTV_FIXED = 0x0001,
KTV_VAR = 0x0002,
});
/*
* Macros that generate the appropriate kalloc_type variant (i.e fixed or
* variable) of the desired variable/function.
*/
#define kalloc_type_var(type, var) \
((type) == KTV_FIXED? \
(vm_offset_t) kalloc_type_##var##_fixed: \
(vm_offset_t) kalloc_type_##var##_var)
#define kalloc_type_func(type, func, ...) \
((type) == KTV_FIXED? \
kalloc_type_##func##_fixed(__VA_ARGS__): \
kalloc_type_##func##_var(__VA_ARGS__))
TUNABLE(kalloc_type_options_t, kt_options, "kt", 0);
TUNABLE(uint16_t, kt_var_heaps, "kt_var_heaps",
ZSECURITY_CONFIG_KT_VAR_BUDGET);
TUNABLE(uint16_t, kt_fixed_zones, "kt_fixed_zones",
ZSECURITY_CONFIG_KT_BUDGET);
TUNABLE(uint16_t, kt_var_ptr_heaps, "kt_var_ptr_heaps", 2);
static TUNABLE(bool, kt_shared_fixed, "-kt-shared", true);
/*
* Section start/end for fixed kalloc_type views
*/
extern struct kalloc_type_view kalloc_type_sec_start_fixed[]
__SECTION_START_SYM(KALLOC_TYPE_SEGMENT, "__kalloc_type");
extern struct kalloc_type_view kalloc_type_sec_end_fixed[]
__SECTION_END_SYM(KALLOC_TYPE_SEGMENT, "__kalloc_type");
/*
* Section start/end for variable kalloc_type views
*/
extern struct kalloc_type_var_view kalloc_type_sec_start_var[]
__SECTION_START_SYM(KALLOC_TYPE_SEGMENT, "__kalloc_var");
extern struct kalloc_type_var_view kalloc_type_sec_end_var[]
__SECTION_END_SYM(KALLOC_TYPE_SEGMENT, "__kalloc_var");
__startup_data
static kalloc_type_views_t *kt_buffer = NULL;
__startup_data
static uint64_t kt_count;
__startup_data
uint32_t kalloc_type_hash_seed;
__startup_data
static uint16_t kt_freq_list[MAX_K_ZONE(kt_zone_cfg)];
__startup_data
static uint16_t kt_freq_list_total[MAX_K_ZONE(kt_zone_cfg)];
struct nzones_with_idx {
uint16_t nzones;
uint16_t idx;
};
int16_t zone_carry = 0;
_Static_assert(__builtin_popcount(KT_SUMMARY_MASK_TYPE_BITS) == (KT_GRANULE_MAX + 1),
"KT_SUMMARY_MASK_TYPE_BITS doesn't match KT_GRANULE_MAX");
/*
* For use by lldb to iterate over kalloc types
*/
SECURITY_READ_ONLY_LATE(uint64_t) num_kt_sizeclass = MAX_K_ZONE(kt_zone_cfg);
SECURITY_READ_ONLY_LATE(zone_t) kalloc_type_zarray[MAX_K_ZONE(kt_zone_cfg)];
SECURITY_READ_ONLY_LATE(zone_t) kt_singleton_array[MAX_K_ZONE(kt_zone_cfg)];
#define KT_GET_HASH(flags) (uint16_t)((flags & KT_HASH) >> 16)
static_assert(KT_HASH >> 16 == (KMEM_RANGE_MASK | KMEM_HASH_SET |
KMEM_DIRECTION_MASK),
"Insufficient bits to represent range and dir for VM allocations");
static_assert(MAX_K_ZONE(kt_zone_cfg) < KALLOC_TYPE_IDX_MASK,
"validate idx mask");
/* qsort routines */
typedef int (*cmpfunc_t)(const void *a, const void *b);
extern void qsort(void *a, size_t n, size_t es, cmpfunc_t cmp);
static inline uint16_t
kalloc_type_get_idx(uint32_t kt_size)
{
return (uint16_t) (kt_size >> KALLOC_TYPE_IDX_SHIFT);
}
static inline uint32_t
kalloc_type_set_idx(uint32_t kt_size, uint16_t idx)
{
return kt_size | ((uint32_t) idx << KALLOC_TYPE_IDX_SHIFT);
}
static void
kalloc_type_build_dlut(void)
{
vm_size_t size = 0;
for (int i = 0; i < KALLOC_DLUT_SIZE; i++, size += KALLOC_MINALIGN) {
uint8_t zindex = 0;
while (kt_zone_cfg[zindex] < size) {
zindex++;
}
kalloc_type_dlut[i] = zindex;
}
}
static uint32_t
kalloc_type_idx_for_size(uint32_t size)
{
assert(size <= KHEAP_MAX_SIZE);
uint16_t idx = kalloc_type_dlut[INDEX_ZDLUT(size)];
return kalloc_type_set_idx(size, idx);
}
static void
kalloc_type_assign_zone_fixed(
kalloc_type_view_t *cur,
kalloc_type_view_t *end,
zone_t z,
zone_t sig_zone,
zone_t shared_zone)
{
/*
* Assign the zone created for every kalloc_type_view
* of the same unique signature
*/
bool need_raw_view = false;
while (cur < end) {
kalloc_type_view_t kt = *cur;
struct zone_view *zv = &kt->kt_zv;
zv->zv_zone = z;
kalloc_type_flags_t kt_flags = kt->kt_flags;
zone_security_flags_t zsflags = zone_security_config(z);
assert(kalloc_type_get_size(kt->kt_size) <= z->z_elem_size);
if (!shared_zone) {
assert(zsflags.z_kheap_id == KHEAP_ID_DATA_BUFFERS);
}
if (kt_flags & KT_SLID) {
kt->kt_signature -= vm_kernel_slide;
kt->kt_zv.zv_name -= vm_kernel_slide;
}
if ((kt_flags & KT_PRIV_ACCT) ||
((kt_options & KT_OPTIONS_ACCT) && (kt_flags & KT_DEFAULT))) {
zv->zv_stats = zalloc_percpu_permanent_type(
struct zone_stats);
need_raw_view = true;
zone_view_count += 1;
} else {
zv->zv_stats = z->z_stats;
}
if ((kt_flags & KT_NOSHARED) || !shared_zone) {
if ((kt_flags & KT_NOSHARED) && !(kt_flags & KT_PRIV_ACCT)) {
panic("KT_NOSHARED used w/o private accounting for view %s",
zv->zv_name);
}
zpercpu_foreach(zs, zv->zv_stats) {
os_atomic_store(&zs->zs_alloc_not_shared, 1, relaxed);
}
}
if (zsflags.z_kheap_id != KHEAP_ID_DATA_BUFFERS) {
kt->kt_zshared = shared_zone;
kt->kt_zsig = sig_zone;
/*
* If we haven't yet set the signature equivalance then set it
* otherwise validate that the zone has the same signature equivalance
* as the sig_zone provided
*/
if (!zone_get_sig_eq(z)) {
zone_set_sig_eq(z, zone_index(sig_zone));
} else {
assert(zone_get_sig_eq(z) == zone_get_sig_eq(sig_zone));
}
}
zv->zv_next = (zone_view_t) z->z_views;
zv->zv_zone->z_views = (zone_view_t) kt;
cur++;
}
if (need_raw_view) {
zone_view_count += 1;
}
}
__startup_func
static void
kalloc_type_assign_zone_var(kalloc_type_var_view_t *cur,
kalloc_type_var_view_t *end, uint32_t heap_idx)
{
struct kheap_info *cfg = &kalloc_type_heap_array[heap_idx];
while (cur < end) {
kalloc_type_var_view_t kt = *cur;
kt->kt_heap_start = cfg->kh_zstart;
kalloc_type_flags_t kt_flags = kt->kt_flags;
if (kt_flags & KT_SLID) {
if (kt->kt_sig_hdr) {
kt->kt_sig_hdr -= vm_kernel_slide;
}
kt->kt_sig_type -= vm_kernel_slide;
kt->kt_name -= vm_kernel_slide;
}
if ((kt_flags & KT_PRIV_ACCT) ||
((kt_options & KT_OPTIONS_ACCT) && (kt_flags & KT_DEFAULT))) {
kt->kt_stats = zalloc_percpu_permanent_type(struct zone_stats);
zone_view_count += 1;
}
kt->kt_next = (zone_view_t) cfg->kt_views;
cfg->kt_views = kt;
cur++;
}
}
__startup_func
static inline void
kalloc_type_slide_fixed(vm_offset_t addr)
{
kalloc_type_view_t ktv = (struct kalloc_type_view *) addr;
ktv->kt_signature += vm_kernel_slide;
ktv->kt_zv.zv_name += vm_kernel_slide;
ktv->kt_flags |= KT_SLID;
}
__startup_func
static inline void
kalloc_type_slide_var(vm_offset_t addr)
{
kalloc_type_var_view_t ktv = (struct kalloc_type_var_view *) addr;
if (ktv->kt_sig_hdr) {
ktv->kt_sig_hdr += vm_kernel_slide;
}
ktv->kt_sig_type += vm_kernel_slide;
ktv->kt_name += vm_kernel_slide;
ktv->kt_flags |= KT_SLID;
}
__startup_func
static void
kalloc_type_validate_flags(
kalloc_type_flags_t kt_flags,
const char *kt_name,
uuid_string_t kext_uuid)
{
if (!(kt_flags & KT_CHANGED) || !(kt_flags & KT_CHANGED2)) {
panic("kalloc_type_view(%s) from kext(%s) hasn't been rebuilt with "
"required xnu headers", kt_name, kext_uuid);
}
}
static kalloc_type_flags_t
kalloc_type_get_flags_fixed(vm_offset_t addr, uuid_string_t kext_uuid)
{
kalloc_type_view_t ktv = (kalloc_type_view_t) addr;
kalloc_type_validate_flags(ktv->kt_flags, ktv->kt_zv.zv_name, kext_uuid);
return ktv->kt_flags;
}
static kalloc_type_flags_t
kalloc_type_get_flags_var(vm_offset_t addr, uuid_string_t kext_uuid)
{
kalloc_type_var_view_t ktv = (kalloc_type_var_view_t) addr;
kalloc_type_validate_flags(ktv->kt_flags, ktv->kt_name, kext_uuid);
return ktv->kt_flags;
}
/*
* Check if signature of type is made up of only data and padding
*/
static bool
kalloc_type_is_data(kalloc_type_flags_t kt_flags)
{
assert(kt_flags & KT_CHANGED);
return kt_flags & KT_DATA_ONLY;
}
/*
* Check if signature of type is made up of only pointers
*/
static bool
kalloc_type_is_ptr_array(kalloc_type_flags_t kt_flags)
{
assert(kt_flags & KT_CHANGED2);
return kt_flags & KT_PTR_ARRAY;
}
static bool
kalloc_type_from_vm(kalloc_type_flags_t kt_flags)
{
assert(kt_flags & KT_CHANGED);
return kt_flags & KT_VM;
}
__startup_func
static inline vm_size_t
kalloc_type_view_sz_fixed(void)
{
return sizeof(struct kalloc_type_view);
}
__startup_func
static inline vm_size_t
kalloc_type_view_sz_var(void)
{
return sizeof(struct kalloc_type_var_view);
}
__startup_func
static inline uint64_t
kalloc_type_view_count(kalloc_type_variant_t type, vm_offset_t start,
vm_offset_t end)
{
return (end - start) / kalloc_type_func(type, view_sz);
}
__startup_func
static inline void
kalloc_type_buffer_copy_fixed(kalloc_type_views_t *buffer, vm_offset_t ktv)
{
buffer->ktv_fixed = (kalloc_type_view_t) ktv;
}
__startup_func
static inline void
kalloc_type_buffer_copy_var(kalloc_type_views_t *buffer, vm_offset_t ktv)
{
buffer->ktv_var = (kalloc_type_var_view_t) ktv;
}
__startup_func
static void
kalloc_type_handle_data_view_fixed(vm_offset_t addr)
{
kalloc_type_view_t cur_data_view = (kalloc_type_view_t) addr;
zone_t z = kalloc_zone_for_size(KHEAP_DATA_BUFFERS->kh_zstart,
cur_data_view->kt_size);
kalloc_type_assign_zone_fixed(&cur_data_view, &cur_data_view + 1, z, NULL,
NULL);
}
__startup_func
static void
kalloc_type_handle_data_view_var(vm_offset_t addr)
{
kalloc_type_var_view_t ktv = (kalloc_type_var_view_t) addr;
kalloc_type_assign_zone_var(&ktv, &ktv + 1, KT_VAR_DATA_HEAP);
}
__startup_func
static uint32_t
kalloc_type_handle_parray_var(void)
{
uint32_t i = 0;
kalloc_type_var_view_t kt = kt_buffer[0].ktv_var;
const char *p_name = kt->kt_name;
/*
* The sorted list of variable kalloc_type_view has pointer arrays at the
* beginning. Walk through them and assign a random pointer heap to each
* type detected by typename.
*/
while (kalloc_type_is_ptr_array(kt->kt_flags)) {
uint32_t heap_id = kmem_get_random16(1) + KT_VAR_PTR_HEAP0;
const char *c_name = kt->kt_name;
uint32_t p_i = i;
while (strcmp(c_name, p_name) == 0) {
i++;
kt = kt_buffer[i].ktv_var;
c_name = kt->kt_name;
}
p_name = c_name;
kalloc_type_assign_zone_var(&kt_buffer[p_i].ktv_var,
&kt_buffer[i].ktv_var, heap_id);
}
/*
* Returns the the index of the first view that isn't a pointer array
*/
return i;
}
__startup_func
static uint32_t
kalloc_hash_adjust(uint32_t hash, uint32_t shift)
{
/*
* Limit range_id to ptr ranges
*/
uint32_t range_id = kmem_adjust_range_id(hash);
uint32_t direction = hash & 0x8000;
return (range_id | KMEM_HASH_SET | direction) << shift;
}
__startup_func
static void
kalloc_type_set_type_hash(const char *sig_ty, const char *sig_hdr,
kalloc_type_flags_t *kt_flags)
{
uint32_t hash = 0;
assert(sig_ty != NULL);
hash = os_hash_jenkins_update(sig_ty, strlen(sig_ty),
kalloc_type_hash_seed);
if (sig_hdr) {
hash = os_hash_jenkins_update(sig_hdr, strlen(sig_hdr), hash);
}
os_hash_jenkins_finish(hash);
hash &= (KMEM_RANGE_MASK | KMEM_DIRECTION_MASK);
*kt_flags = *kt_flags | kalloc_hash_adjust(hash, 16);
}
__startup_func
static void
kalloc_type_set_type_hash_fixed(vm_offset_t addr)
{
/*
* Use backtraces on fixed as we don't have signatures for types that go
* to the VM due to rdar://85182551.
*/
(void) addr;
}
__startup_func
static void
kalloc_type_set_type_hash_var(vm_offset_t addr)
{
kalloc_type_var_view_t ktv = (kalloc_type_var_view_t) addr;
kalloc_type_set_type_hash(ktv->kt_sig_type, ktv->kt_sig_hdr,
&ktv->kt_flags);
}
__startup_func
static void
kalloc_type_mark_processed_fixed(vm_offset_t addr)
{
kalloc_type_view_t ktv = (kalloc_type_view_t) addr;
ktv->kt_flags |= KT_PROCESSED;
}
__startup_func
static void
kalloc_type_mark_processed_var(vm_offset_t addr)
{
kalloc_type_var_view_t ktv = (kalloc_type_var_view_t) addr;
ktv->kt_flags |= KT_PROCESSED;
}
__startup_func
static void
kalloc_type_update_view_fixed(vm_offset_t addr)
{
kalloc_type_view_t ktv = (kalloc_type_view_t) addr;
ktv->kt_size = kalloc_type_idx_for_size(ktv->kt_size);
}
__startup_func
static void
kalloc_type_update_view_var(vm_offset_t addr)
{
(void) addr;
}
__startup_func
static void
kalloc_type_view_copy(
const kalloc_type_variant_t type,
vm_offset_t start,
vm_offset_t end,
uint64_t *cur_count,
bool slide,
uuid_string_t kext_uuid)
{
uint64_t count = kalloc_type_view_count(type, start, end);
if (count + *cur_count >= kt_count) {
panic("kalloc_type_view_copy: Insufficient space in scratch buffer");
}
vm_offset_t cur = start;
while (cur < end) {
if (slide) {
kalloc_type_func(type, slide, cur);
}
kalloc_type_flags_t kt_flags = kalloc_type_func(type, get_flags, cur,
kext_uuid);
kalloc_type_func(type, mark_processed, cur);
/*
* Skip views that go to the VM
*/
if (kalloc_type_from_vm(kt_flags)) {
cur += kalloc_type_func(type, view_sz);
continue;
}
/*
* If signature indicates that the entire allocation is data move it to
* KHEAP_DATA_BUFFERS. Note that KT_VAR_DATA_HEAP is a fake "data" heap,
* variable kalloc_type handles the actual redirection in the entry points
* kalloc/kfree_type_var_impl.
*/
if (kalloc_type_is_data(kt_flags)) {
kalloc_type_func(type, handle_data_view, cur);
cur += kalloc_type_func(type, view_sz);
continue;
}
/*
* Set type hash that is used by kmem_*_guard
*/
kalloc_type_func(type, set_type_hash, cur);
kalloc_type_func(type, update_view, cur);
kalloc_type_func(type, buffer_copy, &kt_buffer[*cur_count], cur);
cur += kalloc_type_func(type, view_sz);
*cur_count = *cur_count + 1;
}
}
__startup_func
static uint64_t
kalloc_type_view_parse(const kalloc_type_variant_t type)
{
kc_format_t kc_format;
uint64_t cur_count = 0;
if (!PE_get_primary_kc_format(&kc_format)) {
panic("kalloc_type_view_parse: wasn't able to determine kc format");
}
if (kc_format == KCFormatStatic) {
/*
* If kc is static or KCGEN, __kalloc_type sections from kexts and
* xnu are coalesced.
*/
kalloc_type_view_copy(type,
kalloc_type_var(type, sec_start),
kalloc_type_var(type, sec_end),
&cur_count, false, NULL);
} else if (kc_format == KCFormatFileset) {
/*
* If kc uses filesets, traverse __kalloc_type section for each
* macho in the BootKC.
*/
kernel_mach_header_t *kc_mh = NULL;
kernel_mach_header_t *kext_mh = NULL;
kc_mh = (kernel_mach_header_t *)PE_get_kc_header(KCKindPrimary);
struct load_command *lc =
(struct load_command *)((vm_offset_t)kc_mh + sizeof(*kc_mh));
for (uint32_t i = 0; i < kc_mh->ncmds;
i++, lc = (struct load_command *)((vm_offset_t)lc + lc->cmdsize)) {
if (lc->cmd != LC_FILESET_ENTRY) {
continue;
}
struct fileset_entry_command *fse =
(struct fileset_entry_command *)(vm_offset_t)lc;
kext_mh = (kernel_mach_header_t *)fse->vmaddr;
kernel_section_t *sect = (kernel_section_t *)getsectbynamefromheader(
kext_mh, KALLOC_TYPE_SEGMENT, KALLOC_TYPE_SECTION(type));
if (sect != NULL) {
unsigned long uuidlen = 0;
void *kext_uuid = getuuidfromheader(kext_mh, &uuidlen);
uuid_string_t kext_uuid_str;
if ((kext_uuid != NULL) && (uuidlen == sizeof(uuid_t))) {
uuid_unparse_upper(*(uuid_t *)kext_uuid, kext_uuid_str);
}