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kern_malloc.c
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1987, 1991, 1993
* The Regents of the University of California.
* Copyright (c) 2005-2009 Robert N. M. Watson
* Copyright (c) 2008 Otto Moerbeek <[email protected]> (mallocarray)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)kern_malloc.c 8.3 (Berkeley) 1/4/94
*/
/*
* Kernel malloc(9) implementation -- general purpose kernel memory allocator
* based on memory types. Back end is implemented using the UMA(9) zone
* allocator. A set of fixed-size buckets are used for smaller allocations,
* and a special UMA allocation interface is used for larger allocations.
* Callers declare memory types, and statistics are maintained independently
* for each memory type. Statistics are maintained per-CPU for performance
* reasons. See malloc(9) and comments in malloc.h for a detailed
* description.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_vm.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/asan.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/vmmeter.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/vmem.h>
#ifdef EPOCH_TRACE
#include <sys/epoch.h>
#endif
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_domainset.h>
#include <vm/vm_pageout.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_extern.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/vm_phys.h>
#include <vm/vm_pagequeue.h>
#include <vm/uma.h>
#include <vm/uma_int.h>
#include <vm/uma_dbg.h>
#ifdef DEBUG_MEMGUARD
#include <vm/memguard.h>
#endif
#ifdef DEBUG_REDZONE
#include <vm/redzone.h>
#endif
#if defined(INVARIANTS) && defined(__i386__)
#include <machine/cpu.h>
#endif
#include <ddb/ddb.h>
#ifdef KDTRACE_HOOKS
#include <sys/dtrace_bsd.h>
bool __read_frequently dtrace_malloc_enabled;
dtrace_malloc_probe_func_t __read_mostly dtrace_malloc_probe;
#endif
#if defined(INVARIANTS) || defined(MALLOC_MAKE_FAILURES) || \
defined(DEBUG_MEMGUARD) || defined(DEBUG_REDZONE)
#define MALLOC_DEBUG 1
#endif
#if defined(KASAN) || defined(DEBUG_REDZONE)
#define DEBUG_REDZONE_ARG_DEF , unsigned long osize
#define DEBUG_REDZONE_ARG , osize
#else
#define DEBUG_REDZONE_ARG_DEF
#define DEBUG_REDZONE_ARG
#endif
/*
* When realloc() is called, if the new size is sufficiently smaller than
* the old size, realloc() will allocate a new, smaller block to avoid
* wasting memory. 'Sufficiently smaller' is defined as: newsize <=
* oldsize / 2^n, where REALLOC_FRACTION defines the value of 'n'.
*/
#ifndef REALLOC_FRACTION
#define REALLOC_FRACTION 1 /* new block if <= half the size */
#endif
/*
* Centrally define some common malloc types.
*/
MALLOC_DEFINE(M_CACHE, "cache", "Various Dynamically allocated caches");
MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
MALLOC_DEFINE(M_TEMP, "temp", "misc temporary data buffers");
static struct malloc_type *kmemstatistics;
static int kmemcount;
#define KMEM_ZSHIFT 4
#define KMEM_ZBASE 16
#define KMEM_ZMASK (KMEM_ZBASE - 1)
#define KMEM_ZMAX 65536
#define KMEM_ZSIZE (KMEM_ZMAX >> KMEM_ZSHIFT)
static uint8_t kmemsize[KMEM_ZSIZE + 1];
#ifndef MALLOC_DEBUG_MAXZONES
#define MALLOC_DEBUG_MAXZONES 1
#endif
static int numzones = MALLOC_DEBUG_MAXZONES;
/*
* Small malloc(9) memory allocations are allocated from a set of UMA buckets
* of various sizes.
*
* Warning: the layout of the struct is duplicated in libmemstat for KVM support.
*
* XXX: The comment here used to read "These won't be powers of two for
* long." It's possible that a significant amount of wasted memory could be
* recovered by tuning the sizes of these buckets.
*/
struct {
int kz_size;
const char *kz_name;
uma_zone_t kz_zone[MALLOC_DEBUG_MAXZONES];
} kmemzones[] = {
{16, "malloc-16", },
{32, "malloc-32", },
{64, "malloc-64", },
{128, "malloc-128", },
{256, "malloc-256", },
{384, "malloc-384", },
{512, "malloc-512", },
{1024, "malloc-1024", },
{2048, "malloc-2048", },
{4096, "malloc-4096", },
{8192, "malloc-8192", },
{16384, "malloc-16384", },
{32768, "malloc-32768", },
{65536, "malloc-65536", },
{0, NULL},
};
u_long vm_kmem_size;
SYSCTL_ULONG(_vm, OID_AUTO, kmem_size, CTLFLAG_RDTUN, &vm_kmem_size, 0,
"Size of kernel memory");
static u_long kmem_zmax = KMEM_ZMAX;
SYSCTL_ULONG(_vm, OID_AUTO, kmem_zmax, CTLFLAG_RDTUN, &kmem_zmax, 0,
"Maximum allocation size that malloc(9) would use UMA as backend");
static u_long vm_kmem_size_min;
SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_min, CTLFLAG_RDTUN, &vm_kmem_size_min, 0,
"Minimum size of kernel memory");
static u_long vm_kmem_size_max;
SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_max, CTLFLAG_RDTUN, &vm_kmem_size_max, 0,
"Maximum size of kernel memory");
static u_int vm_kmem_size_scale;
SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RDTUN, &vm_kmem_size_scale, 0,
"Scale factor for kernel memory size");
static int sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_vm, OID_AUTO, kmem_map_size,
CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
sysctl_kmem_map_size, "LU", "Current kmem allocation size");
static int sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_vm, OID_AUTO, kmem_map_free,
CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
sysctl_kmem_map_free, "LU", "Free space in kmem");
static SYSCTL_NODE(_vm, OID_AUTO, malloc, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Malloc information");
static u_int vm_malloc_zone_count = nitems(kmemzones);
SYSCTL_UINT(_vm_malloc, OID_AUTO, zone_count,
CTLFLAG_RD, &vm_malloc_zone_count, 0,
"Number of malloc zones");
static int sysctl_vm_malloc_zone_sizes(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_vm_malloc, OID_AUTO, zone_sizes,
CTLFLAG_RD | CTLTYPE_OPAQUE | CTLFLAG_MPSAFE, NULL, 0,
sysctl_vm_malloc_zone_sizes, "S", "Zone sizes used by malloc");
/*
* The malloc_mtx protects the kmemstatistics linked list.
*/
struct mtx malloc_mtx;
static int sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS);
#if defined(MALLOC_MAKE_FAILURES) || (MALLOC_DEBUG_MAXZONES > 1)
static SYSCTL_NODE(_debug, OID_AUTO, malloc, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Kernel malloc debugging options");
#endif
/*
* malloc(9) fault injection -- cause malloc failures every (n) mallocs when
* the caller specifies M_NOWAIT. If set to 0, no failures are caused.
*/
#ifdef MALLOC_MAKE_FAILURES
static int malloc_failure_rate;
static int malloc_nowait_count;
static int malloc_failure_count;
SYSCTL_INT(_debug_malloc, OID_AUTO, failure_rate, CTLFLAG_RWTUN,
&malloc_failure_rate, 0, "Every (n) mallocs with M_NOWAIT will fail");
SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
&malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
#endif
static int
sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS)
{
u_long size;
size = uma_size();
return (sysctl_handle_long(oidp, &size, 0, req));
}
static int
sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS)
{
u_long size, limit;
/* The sysctl is unsigned, implement as a saturation value. */
size = uma_size();
limit = uma_limit();
if (size > limit)
size = 0;
else
size = limit - size;
return (sysctl_handle_long(oidp, &size, 0, req));
}
static int
sysctl_vm_malloc_zone_sizes(SYSCTL_HANDLER_ARGS)
{
int sizes[nitems(kmemzones)];
int i;
for (i = 0; i < nitems(kmemzones); i++) {
sizes[i] = kmemzones[i].kz_size;
}
return (SYSCTL_OUT(req, &sizes, sizeof(sizes)));
}
/*
* malloc(9) uma zone separation -- sub-page buffer overruns in one
* malloc type will affect only a subset of other malloc types.
*/
#if MALLOC_DEBUG_MAXZONES > 1
static void
tunable_set_numzones(void)
{
TUNABLE_INT_FETCH("debug.malloc.numzones",
&numzones);
/* Sanity check the number of malloc uma zones. */
if (numzones <= 0)
numzones = 1;
if (numzones > MALLOC_DEBUG_MAXZONES)
numzones = MALLOC_DEBUG_MAXZONES;
}
SYSINIT(numzones, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_set_numzones, NULL);
SYSCTL_INT(_debug_malloc, OID_AUTO, numzones, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
&numzones, 0, "Number of malloc uma subzones");
/*
* Any number that changes regularly is an okay choice for the
* offset. Build numbers are pretty good of you have them.
*/
static u_int zone_offset = __FreeBSD_version;
TUNABLE_INT("debug.malloc.zone_offset", &zone_offset);
SYSCTL_UINT(_debug_malloc, OID_AUTO, zone_offset, CTLFLAG_RDTUN,
&zone_offset, 0, "Separate malloc types by examining the "
"Nth character in the malloc type short description.");
static void
mtp_set_subzone(struct malloc_type *mtp)
{
struct malloc_type_internal *mtip;
const char *desc;
size_t len;
u_int val;
mtip = &mtp->ks_mti;
desc = mtp->ks_shortdesc;
if (desc == NULL || (len = strlen(desc)) == 0)
val = 0;
else
val = desc[zone_offset % len];
mtip->mti_zone = (val % numzones);
}
static inline u_int
mtp_get_subzone(struct malloc_type *mtp)
{
struct malloc_type_internal *mtip;
mtip = &mtp->ks_mti;
KASSERT(mtip->mti_zone < numzones,
("mti_zone %u out of range %d",
mtip->mti_zone, numzones));
return (mtip->mti_zone);
}
#elif MALLOC_DEBUG_MAXZONES == 0
#error "MALLOC_DEBUG_MAXZONES must be positive."
#else
static void
mtp_set_subzone(struct malloc_type *mtp)
{
struct malloc_type_internal *mtip;
mtip = &mtp->ks_mti;
mtip->mti_zone = 0;
}
static inline u_int
mtp_get_subzone(struct malloc_type *mtp)
{
return (0);
}
#endif /* MALLOC_DEBUG_MAXZONES > 1 */
/*
* An allocation has succeeded -- update malloc type statistics for the
* amount of bucket size. Occurs within a critical section so that the
* thread isn't preempted and doesn't migrate while updating per-PCU
* statistics.
*/
static void
malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
int zindx)
{
struct malloc_type_internal *mtip;
struct malloc_type_stats *mtsp;
critical_enter();
mtip = &mtp->ks_mti;
mtsp = zpcpu_get(mtip->mti_stats);
if (size > 0) {
mtsp->mts_memalloced += size;
mtsp->mts_numallocs++;
}
if (zindx != -1)
mtsp->mts_size |= 1 << zindx;
#ifdef KDTRACE_HOOKS
if (__predict_false(dtrace_malloc_enabled)) {
uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_MALLOC];
if (probe_id != 0)
(dtrace_malloc_probe)(probe_id,
(uintptr_t) mtp, (uintptr_t) mtip,
(uintptr_t) mtsp, size, zindx);
}
#endif
critical_exit();
}
void
malloc_type_allocated(struct malloc_type *mtp, unsigned long size)
{
if (size > 0)
malloc_type_zone_allocated(mtp, size, -1);
}
/*
* A free operation has occurred -- update malloc type statistics for the
* amount of the bucket size. Occurs within a critical section so that the
* thread isn't preempted and doesn't migrate while updating per-CPU
* statistics.
*/
void
malloc_type_freed(struct malloc_type *mtp, unsigned long size)
{
struct malloc_type_internal *mtip;
struct malloc_type_stats *mtsp;
critical_enter();
mtip = &mtp->ks_mti;
mtsp = zpcpu_get(mtip->mti_stats);
mtsp->mts_memfreed += size;
mtsp->mts_numfrees++;
#ifdef KDTRACE_HOOKS
if (__predict_false(dtrace_malloc_enabled)) {
uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_FREE];
if (probe_id != 0)
(dtrace_malloc_probe)(probe_id,
(uintptr_t) mtp, (uintptr_t) mtip,
(uintptr_t) mtsp, size, 0);
}
#endif
critical_exit();
}
/*
* contigmalloc:
*
* Allocate a block of physically contiguous memory.
*
* If M_NOWAIT is set, this routine will not block and return NULL if
* the allocation fails.
*/
void *
contigmalloc(unsigned long size, struct malloc_type *type, int flags,
vm_paddr_t low, vm_paddr_t high, unsigned long alignment,
vm_paddr_t boundary)
{
void *ret;
ret = (void *)kmem_alloc_contig(size, flags, low, high, alignment,
boundary, VM_MEMATTR_DEFAULT);
if (ret != NULL)
malloc_type_allocated(type, round_page(size));
return (ret);
}
void *
contigmalloc_domainset(unsigned long size, struct malloc_type *type,
struct domainset *ds, int flags, vm_paddr_t low, vm_paddr_t high,
unsigned long alignment, vm_paddr_t boundary)
{
void *ret;
ret = (void *)kmem_alloc_contig_domainset(ds, size, flags, low, high,
alignment, boundary, VM_MEMATTR_DEFAULT);
if (ret != NULL)
malloc_type_allocated(type, round_page(size));
return (ret);
}
/*
* contigfree:
*
* Free a block of memory allocated by contigmalloc.
*
* This routine may not block.
*/
void
contigfree(void *addr, unsigned long size, struct malloc_type *type)
{
kmem_free((vm_offset_t)addr, size);
malloc_type_freed(type, round_page(size));
}
#ifdef MALLOC_DEBUG
static int
malloc_dbg(caddr_t *vap, size_t *sizep, struct malloc_type *mtp,
int flags)
{
#ifdef INVARIANTS
int indx;
KASSERT(mtp->ks_version == M_VERSION, ("malloc: bad malloc type version"));
/*
* Check that exactly one of M_WAITOK or M_NOWAIT is specified.
*/
indx = flags & (M_WAITOK | M_NOWAIT);
if (indx != M_NOWAIT && indx != M_WAITOK) {
static struct timeval lasterr;
static int curerr, once;
if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
printf("Bad malloc flags: %x\n", indx);
kdb_backtrace();
flags |= M_WAITOK;
once++;
}
}
#endif
#ifdef MALLOC_MAKE_FAILURES
if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {
atomic_add_int(&malloc_nowait_count, 1);
if ((malloc_nowait_count % malloc_failure_rate) == 0) {
atomic_add_int(&malloc_failure_count, 1);
*vap = NULL;
return (EJUSTRETURN);
}
}
#endif
if (flags & M_WAITOK) {
KASSERT(curthread->td_intr_nesting_level == 0,
("malloc(M_WAITOK) in interrupt context"));
if (__predict_false(!THREAD_CAN_SLEEP())) {
#ifdef EPOCH_TRACE
epoch_trace_list(curthread);
#endif
KASSERT(1,
("malloc(M_WAITOK) with sleeping prohibited"));
}
}
KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
("malloc: called with spinlock or critical section held"));
#ifdef DEBUG_MEMGUARD
if (memguard_cmp_mtp(mtp, *sizep)) {
*vap = memguard_alloc(*sizep, flags);
if (*vap != NULL)
return (EJUSTRETURN);
/* This is unfortunate but should not be fatal. */
}
#endif
#ifdef DEBUG_REDZONE
*sizep = redzone_size_ntor(*sizep);
#endif
return (0);
}
#endif
/*
* Handle large allocations and frees by using kmem_malloc directly.
*/
static inline bool
malloc_large_slab(uma_slab_t slab)
{
uintptr_t va;
va = (uintptr_t)slab;
return ((va & 1) != 0);
}
static inline size_t
malloc_large_size(uma_slab_t slab)
{
uintptr_t va;
va = (uintptr_t)slab;
return (va >> 1);
}
static caddr_t __noinline
malloc_large(size_t *size, struct malloc_type *mtp, struct domainset *policy,
int flags DEBUG_REDZONE_ARG_DEF)
{
vm_offset_t kva;
caddr_t va;
size_t sz;
sz = roundup(*size, PAGE_SIZE);
kva = kmem_malloc_domainset(policy, sz, flags);
if (kva != 0) {
/* The low bit is unused for slab pointers. */
vsetzoneslab(kva, NULL, (void *)((sz << 1) | 1));
uma_total_inc(sz);
*size = sz;
}
va = (caddr_t)kva;
malloc_type_allocated(mtp, va == NULL ? 0 : sz);
if (__predict_false(va == NULL)) {
KASSERT((flags & M_WAITOK) == 0,
("malloc(M_WAITOK) returned NULL"));
} else {
#ifdef DEBUG_REDZONE
va = redzone_setup(va, osize);
#endif
kasan_mark((void *)va, osize, sz, KASAN_MALLOC_REDZONE);
}
return (va);
}
static void
free_large(void *addr, size_t size)
{
kmem_free((vm_offset_t)addr, size);
uma_total_dec(size);
}
/*
* malloc:
*
* Allocate a block of memory.
*
* If M_NOWAIT is set, this routine will not block and return NULL if
* the allocation fails.
*/
void *
(malloc)(size_t size, struct malloc_type *mtp, int flags)
{
int indx;
caddr_t va;
uma_zone_t zone;
#if defined(DEBUG_REDZONE) || defined(KASAN)
unsigned long osize = size;
#endif
MPASS((flags & M_EXEC) == 0);
#ifdef MALLOC_DEBUG
va = NULL;
if (malloc_dbg(&va, &size, mtp, flags) != 0)
return (va);
#endif
if (__predict_false(size > kmem_zmax))
return (malloc_large(&size, mtp, DOMAINSET_RR(), flags
DEBUG_REDZONE_ARG));
if (size & KMEM_ZMASK)
size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
indx = kmemsize[size >> KMEM_ZSHIFT];
zone = kmemzones[indx].kz_zone[mtp_get_subzone(mtp)];
va = uma_zalloc(zone, flags);
if (va != NULL)
size = zone->uz_size;
malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
if (__predict_false(va == NULL)) {
KASSERT((flags & M_WAITOK) == 0,
("malloc(M_WAITOK) returned NULL"));
}
#ifdef DEBUG_REDZONE
if (va != NULL)
va = redzone_setup(va, osize);
#endif
#ifdef KASAN
if (va != NULL)
kasan_mark((void *)va, osize, size, KASAN_MALLOC_REDZONE);
#endif
return ((void *) va);
}
static void *
malloc_domain(size_t *sizep, int *indxp, struct malloc_type *mtp, int domain,
int flags)
{
uma_zone_t zone;
caddr_t va;
size_t size;
int indx;
size = *sizep;
KASSERT(size <= kmem_zmax && (flags & M_EXEC) == 0,
("malloc_domain: Called with bad flag / size combination."));
if (size & KMEM_ZMASK)
size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
indx = kmemsize[size >> KMEM_ZSHIFT];
zone = kmemzones[indx].kz_zone[mtp_get_subzone(mtp)];
va = uma_zalloc_domain(zone, NULL, domain, flags);
if (va != NULL)
*sizep = zone->uz_size;
*indxp = indx;
return ((void *)va);
}
void *
malloc_domainset(size_t size, struct malloc_type *mtp, struct domainset *ds,
int flags)
{
struct vm_domainset_iter di;
caddr_t va;
int domain;
int indx;
#if defined(KASAN) || defined(DEBUG_REDZONE)
unsigned long osize = size;
#endif
MPASS((flags & M_EXEC) == 0);
#ifdef MALLOC_DEBUG
va = NULL;
if (malloc_dbg(&va, &size, mtp, flags) != 0)
return (va);
#endif
if (__predict_false(size > kmem_zmax))
return (malloc_large(&size, mtp, DOMAINSET_RR(), flags
DEBUG_REDZONE_ARG));
vm_domainset_iter_policy_init(&di, ds, &domain, &flags);
do {
va = malloc_domain(&size, &indx, mtp, domain, flags);
} while (va == NULL && vm_domainset_iter_policy(&di, &domain) == 0);
malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
if (__predict_false(va == NULL)) {
KASSERT((flags & M_WAITOK) == 0,
("malloc(M_WAITOK) returned NULL"));
}
#ifdef DEBUG_REDZONE
if (va != NULL)
va = redzone_setup(va, osize);
#endif
#ifdef KASAN
if (va != NULL)
kasan_mark((void *)va, osize, size, KASAN_MALLOC_REDZONE);
#endif
return (va);
}
/*
* Allocate an executable area.
*/
void *
malloc_exec(size_t size, struct malloc_type *mtp, int flags)
{
return (malloc_domainset_exec(size, mtp, DOMAINSET_RR(), flags));
}
void *
malloc_domainset_exec(size_t size, struct malloc_type *mtp, struct domainset *ds,
int flags)
{
#if defined(DEBUG_REDZONE) || defined(KASAN)
unsigned long osize = size;
#endif
#ifdef MALLOC_DEBUG
caddr_t va;
#endif
flags |= M_EXEC;
#ifdef MALLOC_DEBUG
va = NULL;
if (malloc_dbg(&va, &size, mtp, flags) != 0)
return (va);
#endif
return (malloc_large(&size, mtp, ds, flags DEBUG_REDZONE_ARG));
}
void *
malloc_aligned(size_t size, size_t align, struct malloc_type *type, int flags)
{
return (malloc_domainset_aligned(size, align, type, DOMAINSET_RR(),
flags));
}
void *
malloc_domainset_aligned(size_t size, size_t align,
struct malloc_type *mtp, struct domainset *ds, int flags)
{
void *res;
size_t asize;
KASSERT(powerof2(align),
("malloc_domainset_aligned: wrong align %#zx size %#zx",
align, size));
KASSERT(align <= PAGE_SIZE,
("malloc_domainset_aligned: align %#zx (size %#zx) too large",
align, size));
/*
* Round the allocation size up to the next power of 2,
* because we can only guarantee alignment for
* power-of-2-sized allocations. Further increase the
* allocation size to align if the rounded size is less than
* align, since malloc zones provide alignment equal to their
* size.
*/
if (size == 0)
size = 1;
asize = size <= align ? align : 1UL << flsl(size - 1);
res = malloc_domainset(asize, mtp, ds, flags);
KASSERT(res == NULL || ((uintptr_t)res & (align - 1)) == 0,
("malloc_domainset_aligned: result not aligned %p size %#zx "
"allocsize %#zx align %#zx", res, size, asize, align));
return (res);
}
void *
mallocarray(size_t nmemb, size_t size, struct malloc_type *type, int flags)
{
if (WOULD_OVERFLOW(nmemb, size))
panic("mallocarray: %zu * %zu overflowed", nmemb, size);
return (malloc(size * nmemb, type, flags));
}
void *
mallocarray_domainset(size_t nmemb, size_t size, struct malloc_type *type,
struct domainset *ds, int flags)
{
if (WOULD_OVERFLOW(nmemb, size))
panic("mallocarray_domainset: %zu * %zu overflowed", nmemb, size);
return (malloc_domainset(size * nmemb, type, ds, flags));
}
#if defined(INVARIANTS) && !defined(KASAN)
static void
free_save_type(void *addr, struct malloc_type *mtp, u_long size)
{
struct malloc_type **mtpp = addr;
/*
* Cache a pointer to the malloc_type that most recently freed
* this memory here. This way we know who is most likely to
* have stepped on it later.
*
* This code assumes that size is a multiple of 8 bytes for
* 64 bit machines
*/
mtpp = (struct malloc_type **) ((unsigned long)mtpp & ~UMA_ALIGN_PTR);
mtpp += (size - sizeof(struct malloc_type *)) /
sizeof(struct malloc_type *);
*mtpp = mtp;
}
#endif
#ifdef MALLOC_DEBUG
static int
free_dbg(void **addrp, struct malloc_type *mtp)
{
void *addr;
addr = *addrp;
KASSERT(mtp->ks_version == M_VERSION, ("free: bad malloc type version"));
KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
("free: called with spinlock or critical section held"));
/* free(NULL, ...) does nothing */
if (addr == NULL)
return (EJUSTRETURN);
#ifdef DEBUG_MEMGUARD
if (is_memguard_addr(addr)) {
memguard_free(addr);
return (EJUSTRETURN);
}
#endif
#ifdef DEBUG_REDZONE
redzone_check(addr);
*addrp = redzone_addr_ntor(addr);
#endif
return (0);
}
#endif
/*
* free:
*
* Free a block of memory allocated by malloc.
*
* This routine may not block.
*/
void
free(void *addr, struct malloc_type *mtp)
{
uma_zone_t zone;
uma_slab_t slab;
u_long size;
#ifdef MALLOC_DEBUG
if (free_dbg(&addr, mtp) != 0)
return;
#endif
/* free(NULL, ...) does nothing */
if (addr == NULL)
return;
vtozoneslab((vm_offset_t)addr & (~UMA_SLAB_MASK), &zone, &slab);
if (slab == NULL)
panic("free: address %p(%p) has not been allocated.\n",
addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
if (__predict_true(!malloc_large_slab(slab))) {
size = zone->uz_size;
#if defined(INVARIANTS) && !defined(KASAN)
free_save_type(addr, mtp, size);
#endif
uma_zfree_arg(zone, addr, slab);
} else {
size = malloc_large_size(slab);
free_large(addr, size);
}
malloc_type_freed(mtp, size);
}
/*
* zfree:
*
* Zero then free a block of memory allocated by malloc.
*
* This routine may not block.
*/
void
zfree(void *addr, struct malloc_type *mtp)
{
uma_zone_t zone;
uma_slab_t slab;
u_long size;
#ifdef MALLOC_DEBUG
if (free_dbg(&addr, mtp) != 0)
return;
#endif
/* free(NULL, ...) does nothing */
if (addr == NULL)
return;
vtozoneslab((vm_offset_t)addr & (~UMA_SLAB_MASK), &zone, &slab);
if (slab == NULL)
panic("free: address %p(%p) has not been allocated.\n",
addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
if (__predict_true(!malloc_large_slab(slab))) {
size = zone->uz_size;
#if defined(INVARIANTS) && !defined(KASAN)
free_save_type(addr, mtp, size);
#endif
kasan_mark(addr, size, size, 0);
explicit_bzero(addr, size);
uma_zfree_arg(zone, addr, slab);
} else {
size = malloc_large_size(slab);
kasan_mark(addr, size, size, 0);
explicit_bzero(addr, size);
free_large(addr, size);
}
malloc_type_freed(mtp, size);
}
/*
* realloc: change the size of a memory block
*/
void *
realloc(void *addr, size_t size, struct malloc_type *mtp, int flags)
{
uma_zone_t zone;
uma_slab_t slab;
unsigned long alloc;
void *newaddr;
KASSERT(mtp->ks_version == M_VERSION,
("realloc: bad malloc type version"));
KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
("realloc: called with spinlock or critical section held"));
/* realloc(NULL, ...) is equivalent to malloc(...) */
if (addr == NULL)
return (malloc(size, mtp, flags));
/*
* XXX: Should report free of old memory and alloc of new memory to
* per-CPU stats.
*/
#ifdef DEBUG_MEMGUARD
if (is_memguard_addr(addr))
return (memguard_realloc(addr, size, mtp, flags));