xnu-4570.20.62.tar.gz

[apple/xnu.git] / osfmk / kern / kalloc.c

diff --git a/osfmk/kern/kalloc.c b/osfmk/kern/kalloc.c
index 79138f76b132d153fd457a43f4004cdfd7c46ad1..97b04c739d114b8a169bc0b84947ba8a36c01cd8 100644 (file)
--- a/osfmk/kern/kalloc.c
+++ b/osfmk/kern/kalloc.c
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2011 Apple Computer, Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 


@@ -72,93 +72,214 @@
 #include <kern/misc_protos.h>
 #include <kern/zalloc.h>
 #include <kern/kalloc.h>
 #include <kern/misc_protos.h>
 #include <kern/zalloc.h>
 #include <kern/kalloc.h>

-#include <kern/lock.h>
+#include <kern/ledger.h>

 #include <vm/vm_kern.h>
 #include <vm/vm_object.h>
 #include <vm/vm_map.h>
 #include <libkern/OSMalloc.h>
 #include <vm/vm_kern.h>
 #include <vm/vm_object.h>
 #include <vm/vm_map.h>
 #include <libkern/OSMalloc.h>

+#include <sys/kdebug.h>
+
+#include <san/kasan.h>

 
 #ifdef MACH_BSD
 zone_t kalloc_zone(vm_size_t);
 #endif
 
 
 #ifdef MACH_BSD
 zone_t kalloc_zone(vm_size_t);
 #endif
 

+#define KALLOC_MAP_SIZE_MIN  (16 * 1024 * 1024)
+#define KALLOC_MAP_SIZE_MAX  (128 * 1024 * 1024)

 vm_map_t kalloc_map;
 vm_map_t kalloc_map;

-vm_size_t kalloc_map_size = 16 * 1024 * 1024;

 vm_size_t kalloc_max;
 vm_size_t kalloc_max_prerounded;
 vm_size_t kalloc_kernmap_size; /* size of kallocs that can come from kernel map */
 
 vm_size_t kalloc_max;
 vm_size_t kalloc_max_prerounded;
 vm_size_t kalloc_kernmap_size; /* size of kallocs that can come from kernel map */
 

+/* how many times we couldn't allocate out of kalloc_map and fell back to kernel_map */
+unsigned long kalloc_fallback_count;
+

 unsigned int kalloc_large_inuse;
 vm_size_t    kalloc_large_total;
 vm_size_t    kalloc_large_max;
 vm_size_t    kalloc_largest_allocated = 0;
 unsigned int kalloc_large_inuse;
 vm_size_t    kalloc_large_total;
 vm_size_t    kalloc_large_max;
 vm_size_t    kalloc_largest_allocated = 0;

+uint64_t    kalloc_large_sum;
+
+int    kalloc_fake_zone_index = -1; /* index of our fake zone in statistics arrays */
+
+vm_offset_t    kalloc_map_min;
+vm_offset_t    kalloc_map_max;
+
+#ifdef MUTEX_ZONE
+/*
+ * Diagnostic code to track mutexes separately rather than via the 2^ zones
+ */
+       zone_t          lck_mtx_zone;
+#endif
+
+static void
+KALLOC_ZINFO_SALLOC(vm_size_t bytes)
+{
+       thread_t thr = current_thread();
+       ledger_debit(thr->t_ledger, task_ledgers.tkm_shared, bytes);
+}
+
+static void
+KALLOC_ZINFO_SFREE(vm_size_t bytes)
+{
+       thread_t thr = current_thread();
+       ledger_credit(thr->t_ledger, task_ledgers.tkm_shared, bytes);
+}

 
 /*
  *     All allocations of size less than kalloc_max are rounded to the
 
 /*
  *     All allocations of size less than kalloc_max are rounded to the

- *     next highest power of 2.  This allocator is built on top of
+ *     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.
  *
  *     We assume that kalloc_max is not greater than 64K;
  *     the zone allocator.  A zone is created for each potential size
  *     that we are willing to get in small blocks.
  *
  *     We assume that kalloc_max is not greater than 64K;

- *     thus 16 is a safe array size for k_zone and k_zone_name.

  *
  *     Note that kalloc_max is somewhat confusingly named.
  *     It represents the first power of two for which no zone exists.
  *     kalloc_max_prerounded is the smallest allocation size, before
  *     rounding, for which no zone exists.
  *
  *     Note that kalloc_max is somewhat confusingly named.
  *     It represents the first power of two for which no zone exists.
  *     kalloc_max_prerounded is the smallest allocation size, before
  *     rounding, for which no zone exists.

- *  Also if the allocation size is more than kalloc_kernmap_size 
- *  then allocate from kernel map rather than kalloc_map.
+ *
+ *     Also if the allocation size is more than kalloc_kernmap_size 
+ *     then allocate from kernel map rather than kalloc_map.

  */
 
  */
 

-int first_k_zone = -1;
-struct zone *k_zone[16];
-static const char *k_zone_name[16] = {
-       "kalloc.1",             "kalloc.2",
-       "kalloc.4",             "kalloc.8",
-       "kalloc.16",            "kalloc.32",
-       "kalloc.64",            "kalloc.128",
-       "kalloc.256",           "kalloc.512",
-       "kalloc.1024",          "kalloc.2048",
-       "kalloc.4096",          "kalloc.8192",
-       "kalloc.16384",         "kalloc.32768"
-};
+#if KALLOC_MINSIZE == 16 && KALLOC_LOG2_MINALIGN == 4
+
+#define K_ZONE_SIZES                   \
+       16,                             \
+       32,                             \
+       48,                             \
+/* 3 */        64,                             \
+       80,                             \
+       96,                             \
+/* 6 */        128,                            \
+       160, 192,                               \
+       256,                            \
+/* 9 */        288,                            \
+       512, 576,                               \
+       1024, 1152,                             \
+/* C */        1280,                           \
+       2048,                           \
+       4096
+
+#define K_ZONE_NAMES                   \
+       "kalloc.16",                    \
+       "kalloc.32",                    \
+       "kalloc.48",                    \
+/* 3 */        "kalloc.64",                    \
+       "kalloc.80",                    \
+       "kalloc.96",                    \
+/* 6 */        "kalloc.128",                   \
+       "kalloc.160",                   \
+       "kalloc.192",                   \
+       "kalloc.256",                   \
+/* 9 */        "kalloc.288",                   \
+       "kalloc.512",                   \
+       "kalloc.576",                   \
+       "kalloc.1024",                  \
+       "kalloc.1152",                  \
+/* C */        "kalloc.1280",                  \
+       "kalloc.2048",                  \
+       "kalloc.4096"
+
+#elif KALLOC_MINSIZE == 8 && KALLOC_LOG2_MINALIGN == 3

 
 /*
 
 /*

- *  Max number of elements per zone.  zinit rounds things up correctly
- *  Doing things this way permits each zone to have a different maximum size
- *  based on need, rather than just guessing; it also
- *  means its patchable in case you're wrong!
+ * Tweaked for ARM (and x64) in 04/2011

  */
  */

-unsigned long k_zone_max[16] = {
-      1024,            /*      1 Byte  */
-      1024,            /*      2 Byte  */
-      1024,            /*      4 Byte  */
-      1024,            /*      8 Byte  */
-      1024,            /*     16 Byte  */
-      4096,            /*     32 Byte  */
-      4096,            /*     64 Byte  */
-      4096,            /*    128 Byte  */
-      4096,            /*    256 Byte  */
-      1024,            /*    512 Byte  */
-      1024,            /*   1024 Byte  */
-      1024,            /*   2048 Byte  */
-      1024,            /*   4096 Byte  */
-      4096,            /*   8192 Byte  */
-      64,              /*  16384 Byte  */
-      64,              /*  32768 Byte  */
+
+#define K_ZONE_SIZES                   \
+/* 3 */        8,                              \
+       16,     24,                     \
+       32,     40,     48,             \
+/* 6 */        64,     72,     88,     112,    \
+       128,    192,                    \
+       256,    288,    384,    440,    \
+/* 9 */        512,    576,    768,            \
+       1024,   1152,   1536,           \
+       2048,   2128,   3072,                   \
+       4096,   6144
+
+#define K_ZONE_NAMES                   \
+/* 3 */        "kalloc.8",                     \
+       "kalloc.16",    "kalloc.24",    \
+       "kalloc.32",    "kalloc.40",    "kalloc.48",    \
+/* 6 */        "kalloc.64",    "kalloc.72",    "kalloc.88",    "kalloc.112",   \
+       "kalloc.128",   "kalloc.192",   \
+       "kalloc.256",   "kalloc.288",   "kalloc.384",   "kalloc.440",   \
+/* 9 */        "kalloc.512",   "kalloc.576",   "kalloc.768",   \
+       "kalloc.1024",  "kalloc.1152",  "kalloc.1536",  \
+       "kalloc.2048",  "kalloc.2128",  "kalloc.3072",  \
+       "kalloc.4096",  "kalloc.6144"
+
+#else
+#error missing zone size parameters for kalloc
+#endif
+
+#define KALLOC_MINALIGN (1 << KALLOC_LOG2_MINALIGN)
+#define KiB(x) (1024 * (x))
+
+static const int k_zone_size[] = {
+       K_ZONE_SIZES,
+       KiB(8),
+       KiB(16),
+       KiB(32)

 };
 
 };
 

+#define MAX_K_ZONE     (sizeof (k_zone_size) / sizeof (k_zone_size[0]))
+
+static const char *k_zone_name[MAX_K_ZONE] = {
+       K_ZONE_NAMES,
+       "kalloc.8192",
+       "kalloc.16384",
+       "kalloc.32768"
+};
+
+
+/*
+ * Many kalloc() allocations are for small structures containing a few
+ * pointers and longs - the k_zone_dlut[] direct lookup table, indexed by
+ * size normalized to the minimum alignment, finds the right zone index
+ * for them in one dereference.
+ */
+
+#define INDEX_ZDLUT(size)      \
+                       (((size) + KALLOC_MINALIGN - 1) / KALLOC_MINALIGN)
+#define N_K_ZDLUT      (2048 / KALLOC_MINALIGN)
+                               /* covers sizes [0 .. 2048 - KALLOC_MINALIGN] */
+#define MAX_SIZE_ZDLUT ((N_K_ZDLUT - 1) * KALLOC_MINALIGN)
+
+static int8_t k_zone_dlut[N_K_ZDLUT];  /* table of indices into k_zone[] */
+
+/*
+ * If there's no hit in the DLUT, then start searching from k_zindex_start.
+ */
+static int k_zindex_start;
+
+static zone_t k_zone[MAX_K_ZONE];
+
+/* #define KALLOC_DEBUG                1 */
+

 /* forward declarations */
 /* forward declarations */

-void * kalloc_canblock(
-               vm_size_t       size,
-               boolean_t       canblock);
+
+lck_grp_t kalloc_lck_grp;
+lck_mtx_t kalloc_lock;
+
+#define kalloc_spin_lock()     lck_mtx_lock_spin(&kalloc_lock)
+#define kalloc_unlock()                lck_mtx_unlock(&kalloc_lock)

 
 
 /* OSMalloc local data declarations */
 static
 queue_head_t    OSMalloc_tag_list;
 
 
 
 /* OSMalloc local data declarations */
 static
 queue_head_t    OSMalloc_tag_list;
 

-decl_simple_lock_data(static,OSMalloc_tag_lock)
+lck_grp_t *OSMalloc_tag_lck_grp;
+lck_mtx_t OSMalloc_tag_lock;
+
+#define OSMalloc_tag_spin_lock()       lck_mtx_lock_spin(&OSMalloc_tag_lock)
+#define OSMalloc_tag_unlock()          lck_mtx_unlock(&OSMalloc_tag_lock)
+

 
 /* OSMalloc forward declarations */
 void OSMalloc_init(void);
 
 /* OSMalloc forward declarations */
 void OSMalloc_init(void);


@@ -179,287 +300,468 @@ kalloc_init(
 {
        kern_return_t retval;
        vm_offset_t min;
 {
        kern_return_t retval;
        vm_offset_t min;

-       vm_size_t size;
-       register int i;
+       vm_size_t size, kalloc_map_size;
+       int i;
+       vm_map_kernel_flags_t vmk_flags;
+
+       /* 
+        * Scale the kalloc_map_size to physical memory size: stay below 
+        * 1/8th the total zone map size, or 128 MB (for a 32-bit kernel).
+        */
+       kalloc_map_size = (vm_size_t)(sane_size >> 5);
+#if !__LP64__
+       if (kalloc_map_size > KALLOC_MAP_SIZE_MAX)
+               kalloc_map_size = KALLOC_MAP_SIZE_MAX;
+#endif /* !__LP64__ */
+       if (kalloc_map_size < KALLOC_MAP_SIZE_MIN)
+               kalloc_map_size = KALLOC_MAP_SIZE_MIN;
+
+       vmk_flags = VM_MAP_KERNEL_FLAGS_NONE;
+       vmk_flags.vmkf_permanent = TRUE;

 
        retval = kmem_suballoc(kernel_map, &min, kalloc_map_size,
 
        retval = kmem_suballoc(kernel_map, &min, kalloc_map_size,

-                              FALSE, VM_FLAGS_ANYWHERE, &kalloc_map);
+                              FALSE,
+                              (VM_FLAGS_ANYWHERE),
+                              vmk_flags,
+                              VM_KERN_MEMORY_KALLOC,
+                              &kalloc_map);

 
        if (retval != KERN_SUCCESS)
                panic("kalloc_init: kmem_suballoc failed");
 
 
        if (retval != KERN_SUCCESS)
                panic("kalloc_init: kmem_suballoc failed");
 

+       kalloc_map_min = min;
+       kalloc_map_max = min + kalloc_map_size - 1;
+

        /*
        /*

-        *      Ensure that zones up to size 8192 bytes exist.
-        *      This is desirable because messages are allocated
-        *      with kalloc, and messages up through size 8192 are common.
+        * Create zones up to a least 2 pages because small page-multiples are common
+        * allocations. Also ensure that zones up to size 8192 bytes exist. This is
+        * desirable because messages are allocated with kalloc(), and messages up
+        * through size 8192 are common.

         */
         */

+       kalloc_max = PAGE_SIZE << 2;
+       if (kalloc_max < KiB(16)) {
+           kalloc_max = KiB(16);
+       }
+       assert(kalloc_max <= KiB(64)); /* assumption made in size arrays */

 
 

-       if (PAGE_SIZE < 16*1024)
-               kalloc_max = 16*1024;
-       else
-               kalloc_max = PAGE_SIZE;

        kalloc_max_prerounded = kalloc_max / 2 + 1;
        kalloc_max_prerounded = kalloc_max / 2 + 1;

-       /* size it to be more than 16 times kalloc_max (256k) for allocations from kernel map */
+       /* allocations larger than 16 times kalloc_max go directly to kernel map */

        kalloc_kernmap_size = (kalloc_max * 16) + 1;
        kalloc_kernmap_size = (kalloc_max * 16) + 1;

+       kalloc_largest_allocated = kalloc_kernmap_size;

 
        /*
 
        /*

-        *      Allocate a zone for each size we are going to handle.
-        *      We specify non-paged memory.
+        * Allocate a zone for each size we are going to handle. Don't charge the
+        * caller for the allocation, as we aren't sure how the memory will be
+        * handled.

         */
         */

-       for (i = 0, size = 1; size < kalloc_max; i++, size <<= 1) {
-               if (size < KALLOC_MINSIZE) {
-                       k_zone[i] = 0;
-                       continue;
-               }
-               if (size == KALLOC_MINSIZE) {
-                       first_k_zone = i;
+       for (i = 0; i < (int)MAX_K_ZONE && (size = k_zone_size[i]) < kalloc_max; i++) {
+               k_zone[i] = zinit(size, size, size, k_zone_name[i]);
+               zone_change(k_zone[i], Z_CALLERACCT, FALSE);
+#if VM_MAX_TAG_ZONES
+               if (zone_tagging_on) zone_change(k_zone[i], Z_TAGS_ENABLED, TRUE);
+#endif
+               zone_change(k_zone[i], Z_KASAN_QUARANTINE, FALSE);
+       }
+
+       /*
+        * Build the Direct LookUp Table for small allocations
+        */
+       for (i = 0, size = 0; i <= N_K_ZDLUT; i++, size += KALLOC_MINALIGN) {
+               int zindex = 0;
+
+               while ((vm_size_t)k_zone_size[zindex] < size)
+                       zindex++;
+
+               if (i == N_K_ZDLUT) {
+                       k_zindex_start = zindex;
+                       break;

                }
                }

-               k_zone[i] = zinit(size, k_zone_max[i] * size, size,
-                                 k_zone_name[i]);
+               k_zone_dlut[i] = (int8_t)zindex;

        }
        }

-       OSMalloc_init();
-}

 
 

-void *
-kalloc_canblock(
-               vm_size_t       size,
-               boolean_t       canblock)
-{
-       register int zindex;
-       register vm_size_t allocsize;
-       vm_map_t alloc_map = VM_MAP_NULL;
+#ifdef KALLOC_DEBUG
+       printf("kalloc_init: k_zindex_start %d\n", k_zindex_start);

 
        /*
 
        /*

-        * If size is too large for a zone, then use kmem_alloc.
-        * (We use kmem_alloc instead of kmem_alloc_wired so that
-        * krealloc can use kmem_realloc.)
+        * Do a quick synthesis to see how well/badly we can
+        * find-a-zone for a given size.
+        * Useful when debugging/tweaking the array of zone sizes.
+        * Cache misses probably more critical than compare-branches!

         */
         */

+       for (i = 0; i < (int)MAX_K_ZONE; i++) {
+               vm_size_t testsize = (vm_size_t)k_zone_size[i] - 1;
+               int compare = 0;
+               int zindex;

 
 

-       if (size >= kalloc_max_prerounded) {
-               void *addr;
+               if (testsize < MAX_SIZE_ZDLUT) {
+                       compare += 1;   /* 'if' (T) */

 
 

-               /* kmem_alloc could block so we return if noblock */
-               if (!canblock) {
-                 return(0);
-               }
+                       long dindex = INDEX_ZDLUT(testsize);
+                       zindex = (int)k_zone_dlut[dindex];

 
 

-               if (size >=  kalloc_kernmap_size) {
-                       alloc_map = kernel_map;
+               } else if (testsize < kalloc_max_prerounded) {

 
 

-                       if (size > kalloc_largest_allocated)
-                               kalloc_largest_allocated = size;
+                       compare += 2;   /* 'if' (F), 'if' (T) */
+
+                       zindex = k_zindex_start;
+                       while ((vm_size_t)k_zone_size[zindex] < testsize) {
+                               zindex++;
+                               compare++;      /* 'while' (T) */
+                       }
+                       compare++;      /* 'while' (F) */

                } else
                } else

-                       alloc_map = kalloc_map;
+                       break;  /* not zone-backed */

 
 

-               if (kmem_alloc(alloc_map, (vm_offset_t *)&addr, size) != KERN_SUCCESS) 
-                       addr = 0;
+               zone_t z = k_zone[zindex];
+               printf("kalloc_init: req size %4lu: %11s took %d compare%s\n",
+                   (unsigned long)testsize, z->zone_name, compare,
+                   compare == 1 ? "" : "s");
+       }
+#endif

 
 

-               if (addr) {
-                       kalloc_large_inuse++;
-                       kalloc_large_total += size;
+       lck_grp_init(&kalloc_lck_grp, "kalloc.large", LCK_GRP_ATTR_NULL);
+       lck_mtx_init(&kalloc_lock, &kalloc_lck_grp, LCK_ATTR_NULL);
+       OSMalloc_init();
+#ifdef MUTEX_ZONE
+       lck_mtx_zone = zinit(sizeof(struct _lck_mtx_), 1024*256, 4096, "lck_mtx");
+#endif
+}

 
 

-                       if (kalloc_large_total > kalloc_large_max)
-                               kalloc_large_max = kalloc_large_total;
-               }
-               return(addr);
-       }
+/*
+ * Given an allocation size, return the kalloc zone it belongs to.
+ * Direct LookUp Table variant.
+ */
+static __inline zone_t
+get_zone_dlut(vm_size_t size)
+{
+       long dindex = INDEX_ZDLUT(size);
+       int zindex = (int)k_zone_dlut[dindex];
+       return (k_zone[zindex]);
+}

 
 

-       /* compute the size of the block that we will actually allocate */
+/* As above, but linear search k_zone_size[] for the next zone that fits. */

 
 

-       allocsize = KALLOC_MINSIZE;
-       zindex = first_k_zone;
-       while (allocsize < size) {
-               allocsize <<= 1;
+static __inline zone_t
+get_zone_search(vm_size_t size, int zindex)
+{
+       assert(size < kalloc_max_prerounded);
+
+       while ((vm_size_t)k_zone_size[zindex] < size)

                zindex++;
                zindex++;

-       }

 
 

-       /* allocate from the appropriate zone */
-       assert(allocsize < kalloc_max);
-       return(zalloc_canblock(k_zone[zindex], canblock));
+       assert((unsigned)zindex < MAX_K_ZONE &&
+           (vm_size_t)k_zone_size[zindex] < kalloc_max);
+
+       return (k_zone[zindex]);

 }
 
 }
 

-void *
-kalloc(
-       vm_size_t size)
+static vm_size_t
+vm_map_lookup_kalloc_entry_locked(
+               vm_map_t        map,
+               void            *addr)

 {
 {

-       return( kalloc_canblock(size, TRUE) );
+       boolean_t       ret;
+       vm_map_entry_t  vm_entry = NULL;
+       
+       ret = vm_map_lookup_entry(map, (vm_map_offset_t)addr, &vm_entry);
+       if (!ret) {
+               panic("Attempting to lookup/free an address not allocated via kalloc! (vm_map_lookup_entry() failed map: %p, addr: %p)\n", 
+                       map, addr);
+       }
+       if (vm_entry->vme_start != (vm_map_offset_t)addr) {
+               panic("Attempting to lookup/free the middle of a kalloc'ed element! (map: %p, addr: %p, entry: %p)\n",
+                       map, addr, vm_entry);
+       }
+       if (!vm_entry->vme_atomic) {
+               panic("Attempting to lookup/free an address not managed by kalloc! (map: %p, addr: %p, entry: %p)\n",
+                       map, addr, vm_entry); 
+       }
+       return (vm_entry->vme_end - vm_entry->vme_start);

 }
 
 }
 

-void *
-kalloc_noblock(
-              vm_size_t size)
+#if KASAN_KALLOC
+/*
+ * KASAN kalloc stashes the original user-requested size away in the poisoned
+ * area. Return that directly.
+ */
+vm_size_t
+kalloc_size(void *addr)

 {
 {

-       return( kalloc_canblock(size, FALSE) );
+       (void)vm_map_lookup_kalloc_entry_locked; /* silence warning */
+       return kasan_user_size((vm_offset_t)addr);

 }
 }

+#else
+vm_size_t
+kalloc_size(
+               void            *addr)
+{
+       vm_map_t                map;
+       vm_size_t               size;

 
 

+       size = zone_element_size(addr, NULL);
+       if (size) {
+               return size;
+       }
+       if (((vm_offset_t)addr >= kalloc_map_min) && ((vm_offset_t)addr < kalloc_map_max)) {
+               map = kalloc_map;
+       } else {
+               map = kernel_map;
+       }
+       vm_map_lock_read(map);
+       size = vm_map_lookup_kalloc_entry_locked(map, addr);
+       vm_map_unlock_read(map);
+       return size;
+}
+#endif

 
 

-void
-krealloc(
-       void            **addrp,
-       vm_size_t       old_size,
-       vm_size_t       new_size,
-       simple_lock_t   lock)
+vm_size_t
+kalloc_bucket_size(
+               vm_size_t       size)

 {
 {

-       register int zindex;
-       register vm_size_t allocsize;
-       void *naddr;
-       vm_map_t alloc_map = VM_MAP_NULL;
+       zone_t          z;
+       vm_map_t        map;
+       
+       if (size < MAX_SIZE_ZDLUT) {
+               z = get_zone_dlut(size);
+               return z->elem_size;
+       } 
+       
+       if (size < kalloc_max_prerounded) {
+               z = get_zone_search(size, k_zindex_start);
+               return z->elem_size;
+       }

 
 

-       /* can only be used for increasing allocation size */
+       if (size >= kalloc_kernmap_size) 
+               map = kernel_map;
+       else
+               map = kalloc_map;
+       
+       return vm_map_round_page(size, VM_MAP_PAGE_MASK(map));
+}

 
 

-       assert(new_size > old_size);
+#if KASAN_KALLOC
+vm_size_t
+kfree_addr(void *addr)
+{
+       vm_size_t origsz = kalloc_size(addr);
+       kfree(addr, origsz);
+       return origsz;
+}
+#else
+vm_size_t
+kfree_addr(
+       void            *addr)
+{
+       vm_map_t        map;
+       vm_size_t       size = 0;
+       kern_return_t   ret;
+       zone_t                  z;
+
+       size = zone_element_size(addr, &z);
+       if (size) {
+               zfree(z, addr);
+               return size;
+       }

 
 

-       /* if old_size is zero, then we are simply allocating */
+       if (((vm_offset_t)addr >= kalloc_map_min) && ((vm_offset_t)addr < kalloc_map_max)) {
+               map = kalloc_map;
+       } else {
+               map = kernel_map;
+       }
+       if ((vm_offset_t)addr < VM_MIN_KERNEL_AND_KEXT_ADDRESS) {
+               panic("kfree on an address not in the kernel & kext address range! addr: %p\n", addr);
+       }

 
 

-       if (old_size == 0) {
-               simple_unlock(lock);
-               naddr = kalloc(new_size);
-               simple_lock(lock);
-               *addrp = naddr;
-               return;
+       vm_map_lock(map);
+       size = vm_map_lookup_kalloc_entry_locked(map, addr);
+       ret = vm_map_remove_locked(map,
+                                                       vm_map_trunc_page((vm_map_offset_t)addr,
+                                                               VM_MAP_PAGE_MASK(map)),
+                                                       vm_map_round_page((vm_map_offset_t)addr + size,
+                                                               VM_MAP_PAGE_MASK(map)),
+                                                       VM_MAP_REMOVE_KUNWIRE);
+       if (ret != KERN_SUCCESS) {
+               panic("vm_map_remove_locked() failed for kalloc vm_entry! addr: %p, map: %p ret: %d\n",
+                               addr, map, ret);

        }
        }

+       vm_map_unlock(map);
+       
+       kalloc_spin_lock();
+       kalloc_large_total -= size;
+       kalloc_large_inuse--;
+       kalloc_unlock();
+
+       KALLOC_ZINFO_SFREE(size);
+       return size;
+}
+#endif

 
 

-       /* if old block was kmem_alloc'd, then use kmem_realloc if necessary */
+void *
+kalloc_canblock(
+               vm_size_t              * psize,
+               boolean_t              canblock,
+               vm_allocation_site_t * site)
+{
+       zone_t z;
+       vm_size_t size;
+       void *addr;
+       vm_tag_t tag;

 
 

-       if (old_size >= kalloc_max_prerounded) {
-               if (old_size >=  kalloc_kernmap_size) 
-                       alloc_map = kernel_map;
-               else
-                       alloc_map = kalloc_map;
+       tag = VM_KERN_MEMORY_KALLOC;
+       size = *psize;

 
 

-               old_size = round_page(old_size);
-               new_size = round_page(new_size);
-               if (new_size > old_size) {
+#if KASAN_KALLOC
+       /* expand the allocation to accomodate redzones */
+       vm_size_t req_size = size;
+       size = kasan_alloc_resize(req_size);
+#endif

 
 

-                       if (KERN_SUCCESS != kmem_realloc(alloc_map, 
-                           (vm_offset_t)*addrp, old_size,
-                           (vm_offset_t *)&naddr, new_size)) {
-                               panic("krealloc: kmem_realloc");
-                               naddr = 0;
-                       }
+       if (size < MAX_SIZE_ZDLUT)
+               z = get_zone_dlut(size);
+       else if (size < kalloc_max_prerounded)
+               z = get_zone_search(size, k_zindex_start);
+       else {
+               /*
+                * If size is too large for a zone, then use kmem_alloc.
+                * (We use kmem_alloc instead of kmem_alloc_kobject so that
+                * krealloc can use kmem_realloc.)
+                */
+               vm_map_t alloc_map;

 
 

-                       simple_lock(lock);
-                       *addrp = (void *) naddr;
+               /* kmem_alloc could block so we return if noblock */
+               if (!canblock) {
+                       return(NULL);
+               }

 
 

-                       /* kmem_realloc() doesn't free old page range. */
-                       kmem_free(alloc_map, (vm_offset_t)*addrp, old_size);
+#if KASAN_KALLOC
+               /* large allocation - use guard pages instead of small redzones */
+               size = round_page(req_size + 2 * PAGE_SIZE);
+               assert(size >= MAX_SIZE_ZDLUT && size >= kalloc_max_prerounded);
+#endif

 
 

-                       kalloc_large_total += (new_size - old_size);
+               if (size >= kalloc_kernmap_size)
+                       alloc_map = kernel_map;
+               else
+                       alloc_map = kalloc_map;

 
 

-                       if (kalloc_large_total > kalloc_large_max)
-                               kalloc_large_max = kalloc_large_total;
+               if (site) tag = vm_tag_alloc(site);

 
 

+               if (kmem_alloc_flags(alloc_map, (vm_offset_t *)&addr, size, tag, KMA_ATOMIC) != KERN_SUCCESS) {
+                       if (alloc_map != kernel_map) {
+                               if (kalloc_fallback_count++ == 0) {
+                                       printf("%s: falling back to kernel_map\n", __func__);
+                               }
+                               if (kmem_alloc_flags(kernel_map, (vm_offset_t *)&addr, size, tag, KMA_ATOMIC) != KERN_SUCCESS)
+                                       addr = NULL;
+                       }
+                       else
+                               addr = NULL;

                }
                }

-               return;
-       }
-
-       /* compute the size of the block that we actually allocated */
-
-       allocsize = KALLOC_MINSIZE;
-       zindex = first_k_zone;
-       while (allocsize < old_size) {
-               allocsize <<= 1;
-               zindex++;
-       }

 
 

-       /* if new size fits in old block, then return */
-
-       if (new_size <= allocsize) {
-               return;
-       }
+               if (addr != NULL) {
+                       kalloc_spin_lock();
+                       /*
+                        * Thread-safe version of the workaround for 4740071
+                        * (a double FREE())
+                        */
+                       if (size > kalloc_largest_allocated)
+                               kalloc_largest_allocated = size;

 
 

-       /* if new size does not fit in zone, kmem_alloc it, else zalloc it */
+                       kalloc_large_inuse++;
+                       kalloc_large_total += size;
+                       kalloc_large_sum += size;

 
 

-       simple_unlock(lock);
-       if (new_size >= kalloc_max_prerounded) {
-               if (new_size >=  kalloc_kernmap_size) 
-                       alloc_map = kernel_map;
-               else
-                       alloc_map = kalloc_map;
-               if (KERN_SUCCESS != kmem_alloc(alloc_map, 
-                   (vm_offset_t *)&naddr, new_size)) {
-                       panic("krealloc: kmem_alloc");
-                       simple_lock(lock);
-                       *addrp = NULL;
-                       return;
-               }
-               kalloc_large_inuse++;
-               kalloc_large_total += new_size;
+                       if (kalloc_large_total > kalloc_large_max)
+                               kalloc_large_max = kalloc_large_total;

 
 

-               if (kalloc_large_total > kalloc_large_max)
-                       kalloc_large_max = kalloc_large_total;
-       } else {
-               register int new_zindex;
+                       kalloc_unlock();

 
 

-               allocsize <<= 1;
-               new_zindex = zindex + 1;
-               while (allocsize < new_size) {
-                       allocsize <<= 1;
-                       new_zindex++;
+                       KALLOC_ZINFO_SALLOC(size);

                }
                }

-               naddr = zalloc(k_zone[new_zindex]);
+#if KASAN_KALLOC
+               /* fixup the return address to skip the redzone */
+               addr = (void *)kasan_alloc((vm_offset_t)addr, size, req_size, PAGE_SIZE);
+#else
+               *psize = round_page(size);
+#endif
+               return(addr);

        }
        }

-       simple_lock(lock);
+#ifdef KALLOC_DEBUG
+       if (size > z->elem_size)
+               panic("%s: z %p (%s) but requested size %lu", __func__,
+                   z, z->zone_name, (unsigned long)size);
+#endif

 
 

-       /* copy existing data */
+       assert(size <= z->elem_size);

 
 

-       bcopy((const char *)*addrp, (char *)naddr, old_size);
+#if VM_MAX_TAG_ZONES
+    if (z->tags && site)
+    {
+               tag = vm_tag_alloc(site);
+               if (!canblock && !vm_allocation_zone_totals[tag]) tag = VM_KERN_MEMORY_KALLOC;
+    }
+#endif

 
 

-       /* free old block, and return */
+       addr =  zalloc_canblock_tag(z, canblock, size, tag);

 
 

-       zfree(k_zone[zindex], *addrp);
+#if KASAN_KALLOC
+       /* fixup the return address to skip the redzone */
+       addr = (void *)kasan_alloc((vm_offset_t)addr, z->elem_size, req_size, KASAN_GUARD_SIZE);

 
 

-       /* set up new address */
+       /* For KASan, the redzone lives in any additional space, so don't
+        * expand the allocation. */
+#else
+       *psize = z->elem_size;
+#endif

 
 

-       *addrp = (void *) naddr;
+       return addr;

 }
 
 }
 

-

 void *
 void *

-kget(
-       vm_size_t       size)
+kalloc_external(
+       vm_size_t size);
+void *
+kalloc_external(
+       vm_size_t size)

 {
 {

-       register int zindex;
-       register vm_size_t allocsize;
-
-       /* size must not be too large for a zone */
-
-       if (size >= kalloc_max_prerounded) {
-               /* This will never work, so we might as well panic */
-               panic("kget");
-       }
-
-       /* compute the size of the block that we will actually allocate */
-
-       allocsize = KALLOC_MINSIZE;
-       zindex = first_k_zone;
-       while (allocsize < size) {
-               allocsize <<= 1;
-               zindex++;
-       }
-
-       /* allocate from the appropriate zone */
-
-       assert(allocsize < kalloc_max);
-       return(zget(k_zone[zindex]));
+       return( kalloc_tag_bt(size, VM_KERN_MEMORY_KALLOC) );

 }
 
 }
 

+volatile SInt32 kfree_nop_count = 0;
+

 void
 kfree(
        void            *data,
        vm_size_t       size)
 {
 void
 kfree(
        void            *data,
        vm_size_t       size)
 {

-       register int zindex;
-       register vm_size_t freesize;
-       vm_map_t alloc_map = VM_MAP_NULL;
+       zone_t z;

 
 

-       /* if size was too large for a zone, then use kmem_free */
+#if KASAN_KALLOC
+       /*
+        * Resize back to the real allocation size and hand off to the KASan
+        * quarantine. `data` may then point to a different allocation.
+        */
+       vm_size_t user_size = size;
+       kasan_check_free((vm_address_t)data, size, KASAN_HEAP_KALLOC);
+       data = (void *)kasan_dealloc((vm_address_t)data, &size);
+       kasan_free(&data, &size, KASAN_HEAP_KALLOC, NULL, user_size, true);
+       if (!data) {
+               return;
+       }
+#endif

 
 

-       if (size >= kalloc_max_prerounded) {
-               if (size >=  kalloc_kernmap_size) {
-                       alloc_map = kernel_map;
+       if (size < MAX_SIZE_ZDLUT)
+               z = get_zone_dlut(size);
+       else if (size < kalloc_max_prerounded)
+               z = get_zone_search(size, k_zindex_start);
+       else {
+               /* if size was too large for a zone, then use kmem_free */

 
 

-                       if (size > kalloc_largest_allocated)
+               vm_map_t alloc_map = kernel_map;
+
+               if ((((vm_offset_t) data) >= kalloc_map_min) && (((vm_offset_t) data) <= kalloc_map_max))
+                       alloc_map = kalloc_map;
+               if (size > kalloc_largest_allocated) {

                                /*
                                 * work around double FREEs of small MALLOCs
                                 * this used to end up being a nop
                                /*
                                 * work around double FREEs of small MALLOCs
                                 * this used to end up being a nop


@@ -473,36 +775,36 @@ kfree(
                                 * the underlying allocation... that pointer ends up 
                                 * looking like a really big size on the 2nd FREE and
                                 * pushes the kfree into the kernel_map...  we
                                 * the underlying allocation... that pointer ends up 
                                 * looking like a really big size on the 2nd FREE and
                                 * pushes the kfree into the kernel_map...  we

-                                * end up removing a ton of virutal space before we panic
+                                * end up removing a ton of virtual space before we panic

                                 * this check causes us to ignore the kfree for a size
                                 * that must be 'bogus'... note that it might not be due
                                 * to the above scenario, but it would still be wrong and
                                 * cause serious damage.
                                 */
                                 * this check causes us to ignore the kfree for a size
                                 * that must be 'bogus'... note that it might not be due
                                 * to the above scenario, but it would still be wrong and
                                 * cause serious damage.
                                 */

+
+                               OSAddAtomic(1, &kfree_nop_count);

                                return;
                                return;

-               } else
-                       alloc_map = kalloc_map;
+               }

                kmem_free(alloc_map, (vm_offset_t)data, size);
                kmem_free(alloc_map, (vm_offset_t)data, size);

+               kalloc_spin_lock();

 
                kalloc_large_total -= size;
                kalloc_large_inuse--;
 
 
                kalloc_large_total -= size;
                kalloc_large_inuse--;
 

-               return;
-       }
-
-       /* compute the size of the block that we actually allocated from */
+               kalloc_unlock();

 
 

-       freesize = KALLOC_MINSIZE;
-       zindex = first_k_zone;
-       while (freesize < size) {
-               freesize <<= 1;
-               zindex++;
+               KALLOC_ZINFO_SFREE(size);
+               return;

        }
 
        /* free to the appropriate zone */
        }
 
        /* free to the appropriate zone */

-
-       assert(freesize < kalloc_max);
-       zfree(k_zone[zindex], data);
+#ifdef KALLOC_DEBUG
+       if (size > z->elem_size)
+               panic("%s: z %p (%s) but requested size %lu", __func__,
+                   z, z->zone_name, (unsigned long)size);
+#endif
+       assert(size <= z->elem_size);
+       zfree(z, data);

 }
 
 #ifdef MACH_BSD
 }
 
 #ifdef MACH_BSD


@@ -510,46 +812,22 @@ zone_t
 kalloc_zone(
        vm_size_t       size)
 {
 kalloc_zone(
        vm_size_t       size)
 {

-       register int zindex = 0;
-       register vm_size_t allocsize;
-
-       /* compute the size of the block that we will actually allocate */
-
-       allocsize = size;
-       if (size <= kalloc_max) {
-               allocsize = KALLOC_MINSIZE;
-               zindex = first_k_zone;
-               while (allocsize < size) {
-                       allocsize <<= 1;
-                       zindex++;
-               }
-               return (k_zone[zindex]);
-       }
+       if (size < MAX_SIZE_ZDLUT)
+               return (get_zone_dlut(size));
+       if (size <= kalloc_max)
+               return (get_zone_search(size, k_zindex_start));

        return (ZONE_NULL);
 }
 #endif
 
        return (ZONE_NULL);
 }
 #endif
 

-
-void
-kalloc_fake_zone_info(int *count, vm_size_t *cur_size, vm_size_t *max_size, vm_size_t *elem_size,
-                    vm_size_t *alloc_size, int *collectable, int *exhaustable)
-{
-       *count      = kalloc_large_inuse;
-       *cur_size   = kalloc_large_total;
-       *max_size   = kalloc_large_max;
-       *elem_size  = kalloc_large_total / kalloc_large_inuse;
-       *alloc_size = kalloc_large_total / kalloc_large_inuse;
-       *collectable = 0;
-       *exhaustable = 0;
-}
-
-

 void
 OSMalloc_init(
        void)
 {
        queue_init(&OSMalloc_tag_list);
 void
 OSMalloc_init(
        void)
 {
        queue_init(&OSMalloc_tag_list);

-       simple_lock_init(&OSMalloc_tag_lock, 0);
+
+       OSMalloc_tag_lck_grp = lck_grp_alloc_init("OSMalloc_tag", LCK_GRP_ATTR_NULL);
+       lck_mtx_init(&OSMalloc_tag_lock, OSMalloc_tag_lck_grp, LCK_ATTR_NULL);

 }
 
 OSMallocTag
 }
 
 OSMallocTag


@@ -568,11 +846,11 @@ OSMalloc_Tagalloc(
 
        OSMTag->OSMT_refcnt = 1;
 
 
        OSMTag->OSMT_refcnt = 1;
 

-       strncpy(OSMTag->OSMT_name, str, OSMT_MAX_NAME);
+       strlcpy(OSMTag->OSMT_name, str, OSMT_MAX_NAME);

 
 

-       simple_lock(&OSMalloc_tag_lock);
+       OSMalloc_tag_spin_lock();

        enqueue_tail(&OSMalloc_tag_list, (queue_entry_t)OSMTag);
        enqueue_tail(&OSMalloc_tag_list, (queue_entry_t)OSMTag);

-       simple_unlock(&OSMalloc_tag_lock);
+       OSMalloc_tag_unlock();

        OSMTag->OSMT_state = OSMT_VALID;
        return(OSMTag);
 }
        OSMTag->OSMT_state = OSMT_VALID;
        return(OSMTag);
 }


@@ -582,9 +860,9 @@ OSMalloc_Tagref(
         OSMallocTag            tag)
 {
        if (!((tag->OSMT_state & OSMT_VALID_MASK) == OSMT_VALID)) 
         OSMallocTag            tag)
 {
        if (!((tag->OSMT_state & OSMT_VALID_MASK) == OSMT_VALID)) 

-               panic("OSMalloc_Tagref(): bad state 0x%08X\n",tag->OSMT_state);
+               panic("OSMalloc_Tagref():'%s' has bad state 0x%08X\n", tag->OSMT_name, tag->OSMT_state);

 
 

-       (void)hw_atomic_add((uint32_t *)(&tag->OSMT_refcnt), 1);
+       (void)hw_atomic_add(&tag->OSMT_refcnt, 1);

 }
 
 void
 }
 
 void


@@ -592,16 +870,16 @@ OSMalloc_Tagrele(
         OSMallocTag            tag)
 {
        if (!((tag->OSMT_state & OSMT_VALID_MASK) == OSMT_VALID))
         OSMallocTag            tag)
 {
        if (!((tag->OSMT_state & OSMT_VALID_MASK) == OSMT_VALID))

-               panic("OSMalloc_Tagref(): bad state 0x%08X\n",tag->OSMT_state);
+               panic("OSMalloc_Tagref():'%s' has bad state 0x%08X\n", tag->OSMT_name, tag->OSMT_state);

 
 

-       if (hw_atomic_sub((uint32_t *)(&tag->OSMT_refcnt), 1) == 0) {
+       if (hw_atomic_sub(&tag->OSMT_refcnt, 1) == 0) {

                if (hw_compare_and_store(OSMT_VALID|OSMT_RELEASED, OSMT_VALID|OSMT_RELEASED, &tag->OSMT_state)) {
                if (hw_compare_and_store(OSMT_VALID|OSMT_RELEASED, OSMT_VALID|OSMT_RELEASED, &tag->OSMT_state)) {

-                       simple_lock(&OSMalloc_tag_lock);
+                       OSMalloc_tag_spin_lock();

                        (void)remque((queue_entry_t)tag);
                        (void)remque((queue_entry_t)tag);

-                       simple_unlock(&OSMalloc_tag_lock);
+                       OSMalloc_tag_unlock();

                        kfree((void*)tag, sizeof(*tag));
                } else
                        kfree((void*)tag, sizeof(*tag));
                } else

-                       panic("OSMalloc_Tagrele(): refcnt 0\n");
+                       panic("OSMalloc_Tagrele():'%s' has refcnt 0\n", tag->OSMT_name);

        }
 }
 
        }
 }
 


@@ -610,12 +888,12 @@ OSMalloc_Tagfree(
         OSMallocTag            tag)
 {
        if (!hw_compare_and_store(OSMT_VALID, OSMT_VALID|OSMT_RELEASED, &tag->OSMT_state))
         OSMallocTag            tag)
 {
        if (!hw_compare_and_store(OSMT_VALID, OSMT_VALID|OSMT_RELEASED, &tag->OSMT_state))

-               panic("OSMalloc_Tagfree(): bad state 0x%08X\n", tag->OSMT_state);
+               panic("OSMalloc_Tagfree():'%s' has bad state 0x%08X \n", tag->OSMT_name, tag->OSMT_state);

 
 

-       if (hw_atomic_sub((uint32_t *)(&tag->OSMT_refcnt), 1) == 0) {
-               simple_lock(&OSMalloc_tag_lock);
+       if (hw_atomic_sub(&tag->OSMT_refcnt, 1) == 0) {
+               OSMalloc_tag_spin_lock();

                (void)remque((queue_entry_t)tag);
                (void)remque((queue_entry_t)tag);

-               simple_unlock(&OSMalloc_tag_lock);
+               OSMalloc_tag_unlock();

                kfree((void*)tag, sizeof(*tag));
        }
 }
                kfree((void*)tag, sizeof(*tag));
        }
 }


@@ -631,11 +909,13 @@ OSMalloc(
        OSMalloc_Tagref(tag);
        if ((tag->OSMT_attr & OSMT_PAGEABLE)
            && (size & ~PAGE_MASK)) {
        OSMalloc_Tagref(tag);
        if ((tag->OSMT_attr & OSMT_PAGEABLE)
            && (size & ~PAGE_MASK)) {

-
-               if ((kr = kmem_alloc_pageable(kernel_map, (vm_offset_t *)&addr, size)) != KERN_SUCCESS)
-                       panic("OSMalloc(): kmem_alloc_pageable() failed 0x%08X\n", kr);
+               if ((kr = kmem_alloc_pageable_external(kernel_map, (vm_offset_t *)&addr, size)) != KERN_SUCCESS)
+                       addr = NULL;

        } else 
        } else 

-               addr = kalloc((vm_size_t)size);
+               addr = kalloc_tag_bt((vm_size_t)size, VM_KERN_MEMORY_KALLOC);
+
+       if (!addr)
+               OSMalloc_Tagrele(tag);

 
        return(addr);
 }
 
        return(addr);
 }


@@ -652,7 +932,7 @@ OSMalloc_nowait(
 
        OSMalloc_Tagref(tag);
        /* XXX: use non-blocking kalloc for now */
 
        OSMalloc_Tagref(tag);
        /* XXX: use non-blocking kalloc for now */

-       addr = kalloc_noblock((vm_size_t)size);
+       addr = kalloc_noblock_tag_bt((vm_size_t)size, VM_KERN_MEMORY_KALLOC);

        if (addr == NULL)
                OSMalloc_Tagrele(tag);
 
        if (addr == NULL)
                OSMalloc_Tagrele(tag);
 


@@ -670,7 +950,7 @@ OSMalloc_noblock(
                return(NULL);
 
        OSMalloc_Tagref(tag);
                return(NULL);
 
        OSMalloc_Tagref(tag);

-       addr = kalloc_noblock((vm_size_t)size);
+       addr = kalloc_noblock_tag_bt((vm_size_t)size, VM_KERN_MEMORY_KALLOC);

        if (addr == NULL)
                OSMalloc_Tagrele(tag);
 
        if (addr == NULL)
                OSMalloc_Tagrele(tag);
 


@@ -687,7 +967,15 @@ OSFree(
            && (size & ~PAGE_MASK)) {
                kmem_free(kernel_map, (vm_offset_t)addr, size);
        } else
            && (size & ~PAGE_MASK)) {
                kmem_free(kernel_map, (vm_offset_t)addr, size);
        } else

-               kfree((void*)addr, size);
+               kfree((void *)addr, size);

 
        OSMalloc_Tagrele(tag);
 }
 
        OSMalloc_Tagrele(tag);
 }

+
+uint32_t
+OSMalloc_size(
+       void                            *addr)
+{
+       return (uint32_t)kalloc_size(addr);
+}
+