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--- libmalloc/libmalloc-474.0.13/src/vm.c
+++ libmalloc/libmalloc-646.40.3/src/vm.c
@@ -23,9 +23,11 @@
#include "internal.h"
+#if !MALLOC_TARGET_EXCLAVES
static volatile uintptr_t entropic_address = 0;
static volatile uintptr_t entropic_base = 0;
static volatile uintptr_t entropic_limit = 0;
+#endif // !MALLOC_TARGET_EXCLAVES
MALLOC_NOEXPORT
uint64_t malloc_entropy[2] = {0, 0};
@@ -44,7 +46,9 @@
mvm_aslr_init(void)
{
// Prepare ASLR
-#if defined(__i386__) || defined(__x86_64__) || defined(__arm64__) || TARGET_OS_DRIVERKIT || (TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
+#if MALLOC_TARGET_EXCLAVES
+ arc4random_buf(malloc_entropy, sizeof(malloc_entropy));
+#elif defined(__i386__) || defined(__x86_64__) || defined(__arm64__) || TARGET_OS_DRIVERKIT || (TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
#if defined(__i386__)
uintptr_t stackbase = 0x8fe00000;
int entropic_bits = 3;
@@ -106,9 +110,73 @@
#endif // TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
}
-void *
-mvm_allocate_pages(size_t size, unsigned char align, uint32_t debug_flags,
- int vm_page_label) {
+void * __sized_by_or_null(size)
+mvm_allocate_plat(uintptr_t addr, size_t size, uint8_t align, int flags, int debug_flags, int vm_page_label, plat_map_t *map_out)
+{
+ if (addr && (flags & VM_FLAGS_ANYWHERE)) {
+ // Pass MALLOC_ABORT_ON_ERROR to make this call abort
+ malloc_zone_error(MALLOC_ABORT_ON_ERROR | debug_flags, false,
+ "Unsupported anywhere allocation at address 0x%lx of size 0x%lx with flags %d\n",
+ (unsigned long) addr, (unsigned long) size, flags);
+ }
+#if MALLOC_TARGET_EXCLAVES
+ // This call can have different behavior depending on `flags` and `map_out`:
+ // 1. If the input handle is invalid and MALLOC_NO_POPULATE is not present,
+ // the handle is initialized and memory is both reserved and populated
+ // 2. If the input handle is invalid and MALLOC_NO_POPULATE is present,
+ // the handle is initialized and memory is only reserved
+ // 3. If the input handle is valid and MALLOC_NO_POPULATE is not present,
+ // memory is populated
+ const _liblibc_map_type_t type = LIBLIBC_MAP_TYPE_PRIVATE |
+ ((flags & VM_FLAGS_ANYWHERE) ? LIBLIBC_MAP_TYPE_NONE : LIBLIBC_MAP_TYPE_FIXED) |
+ ((debug_flags & MALLOC_NO_POPULATE) ? LIBLIBC_MAP_TYPE_NOCOMMIT : LIBLIBC_MAP_TYPE_NONE) |
+ ((debug_flags & DISABLE_ASLR) ? LIBLIBC_MAP_TYPE_NORAND : LIBLIBC_MAP_TYPE_NONE);
+ const _liblibc_map_perm_t perm = LIBLIBC_MAP_PERM_READ | LIBLIBC_MAP_PERM_WRITE;
+ void * __unsafe_indexable map = mmap_plat(map_out, addr, size, perm,
+ type, align, (unsigned)vm_page_label);
+ if (!map) {
+ malloc_zone_error(debug_flags, false,
+ "Failed to allocate memory at address 0x%lx of size 0x%lx with flags %d\n", addr, size, flags);
+ }
+ return __unsafe_forge_bidi_indexable(void *, map, size);
+#else
+ (void)map_out;
+ if (debug_flags & MALLOC_NO_POPULATE) {
+ // Pass MALLOC_ABORT_ON_ERROR to make this call abort
+ malloc_zone_error(MALLOC_ABORT_ON_ERROR | debug_flags, false,
+ "Unsupported unpopulated allocation at address 0x%lx of size 0x%lx with flags %d\n",
+ (unsigned long) addr, (unsigned long) size, flags);
+ }
+
+
+ mach_vm_address_t vm_addr = addr;
+ mach_vm_offset_t allocation_mask = ((mach_vm_offset_t)1 << align) - 1;
+ kern_return_t kr = mach_vm_map(mach_task_self(), &vm_addr,
+ (mach_vm_size_t)size, allocation_mask,
+ flags | VM_MAKE_TAG(vm_page_label), MEMORY_OBJECT_NULL, 0, FALSE,
+ VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
+ if (kr) {
+ return NULL;
+ }
+ return __unsafe_forge_bidi_indexable(void *, vm_addr, size);
+#endif // MALLOC_TARGET_EXCLAVES
+}
+
+void * __sized_by_or_null(size)
+mvm_allocate_pages(size_t size, uint8_t align, uint32_t debug_flags,
+ int vm_page_label)
+{
+ return mvm_allocate_pages_plat(size, align, debug_flags, vm_page_label, NULL);
+}
+
+void * __sized_by_or_null(size)
+mvm_allocate_pages_plat(size_t size, uint8_t align, uint32_t debug_flags,
+ int vm_page_label, plat_map_t *map_out)
+{
+#if MALLOC_TARGET_EXCLAVES
+ return mvm_allocate_plat(0, size, align, VM_FLAGS_ANYWHERE, debug_flags, vm_page_label, map_out);
+#else
+ (void)map_out;
boolean_t add_prelude_guard_page = debug_flags & MALLOC_ADD_PRELUDE_GUARD_PAGE;
boolean_t add_postlude_guard_page = debug_flags & MALLOC_ADD_POSTLUDE_GUARD_PAGE;
boolean_t purgeable = debug_flags & MALLOC_PURGEABLE;
@@ -136,6 +204,8 @@
if (purgeable) {
alloc_flags |= VM_FLAGS_PURGABLE;
}
+
+
if (allocation_size < size) { // size_t arithmetic wrapped!
return NULL;
}
@@ -224,19 +294,54 @@
} else if (add_prelude_guard_page) {
addr += large_vm_page_quanta_size;
}
- mvm_protect((void *)addr, size, PROT_NONE, debug_flags);
+ mvm_protect_plat((void *)addr, size, PROT_NONE, debug_flags, map_out);
}
return (void *)addr;
+#endif // MALLOC_TARGET_EXCLAVES
}
void
-mvm_deallocate_pages(void *addr, size_t size, unsigned debug_flags)
-{
+mvm_deallocate_plat(void * __sized_by(size) addr, size_t size, int debug_flags, plat_map_t *map)
+{
+#if MALLOC_TARGET_EXCLAVES
+ if (!munmap_plat(map, addr, size)) {
+ malloc_zone_error(debug_flags, false,
+ "Failed to deallocate at address %p of size 0x%lx\n", addr, size);
+ }
+#else
+ (void)map;
+ kern_return_t kr = mach_vm_deallocate(mach_task_self(),
+ (mach_vm_address_t)addr, (mach_vm_size_t)size);
+ if (kr) {
+ malloc_zone_error(debug_flags, false,
+ "Failed to deallocate at address %p of size 0x%lx\n", addr, size);
+ }
+#endif // MALLOC_TARGET_EXCLAVES
+}
+
+void
+mvm_deallocate_pages(void * __sized_by(size) addr, size_t size,
+ unsigned debug_flags)
+{
+ mvm_deallocate_pages_plat(addr, size, debug_flags, NULL);
+}
+
+void
+mvm_deallocate_pages_plat(void * __sized_by(size) addr, size_t size,
+ unsigned debug_flags, plat_map_t *map)
+{
+#if MALLOC_TARGET_EXCLAVES
+ if (debug_flags & (MALLOC_ADD_GUARD_PAGE_FLAGS | MALLOC_PURGEABLE)) {
+ malloc_zone_error(MALLOC_ABORT_ON_ERROR | debug_flags, true,
+ "Unsupported deallocation debug flags %u\n", debug_flags);
+ }
+ mvm_deallocate_plat(addr, size, debug_flags, map);
+#else
+ (void)map;
boolean_t added_prelude_guard_page = debug_flags & MALLOC_ADD_PRELUDE_GUARD_PAGE;
boolean_t added_postlude_guard_page = debug_flags & MALLOC_ADD_POSTLUDE_GUARD_PAGE;
mach_vm_address_t vm_addr = (mach_vm_address_t)addr;
mach_vm_size_t allocation_size = size;
- kern_return_t kr;
if (added_prelude_guard_page) {
vm_addr -= large_vm_page_quanta_size;
@@ -245,15 +350,37 @@
if (added_postlude_guard_page) {
allocation_size += large_vm_page_quanta_size;
}
- kr = mach_vm_deallocate(mach_task_self(), vm_addr, allocation_size);
- if (kr) {
- malloc_zone_error(debug_flags, false, "Can't deallocate_pages region at %p\n", addr);
- }
+ mvm_deallocate_plat(__unsafe_forge_bidi_indexable(void *, vm_addr,
+ allocation_size), (size_t)allocation_size, debug_flags, NULL);
+#endif // MALLOC_TARGET_EXCLAVES
}
void
-mvm_protect(void *address, size_t size, unsigned protection, unsigned debug_flags)
-{
+mvm_protect(void * __sized_by(size) address, size_t size, unsigned protection,
+ unsigned debug_flags)
+{
+ mvm_protect_plat(address, size, protection, debug_flags, NULL);
+}
+
+void
+mvm_protect_plat(void * __sized_by(size) address, size_t size, unsigned protection,
+ unsigned debug_flags, plat_map_t *map)
+{
+#if MALLOC_TARGET_EXCLAVES
+ const _liblibc_map_perm_t perm =
+ ((protection & PROT_READ) ? LIBLIBC_MAP_PERM_READ : LIBLIBC_MAP_PERM_NONE) |
+ ((protection & PROT_WRITE) ? LIBLIBC_MAP_PERM_WRITE : LIBLIBC_MAP_PERM_NONE) |
+ ((protection & PROT_EXEC) ? LIBLIBC_MAP_PERM_EXECUTE : LIBLIBC_MAP_PERM_NONE);
+ if (debug_flags & (MALLOC_ADD_GUARD_PAGE_FLAGS | MALLOC_PURGEABLE)) {
+ malloc_zone_error(MALLOC_ABORT_ON_ERROR | debug_flags, true,
+ "Unsupported deallocation debug flags %u\n", debug_flags);
+ }
+ if (!mprotect_plat(map, address, size, perm)) {
+ malloc_zone_error(MALLOC_ABORT_ON_ERROR | debug_flags, true,
+ "Unsupported deallocation address %p or size %lu\n", address, size);
+ }
+#else
+ (void)map;
kern_return_t err;
if ((debug_flags & MALLOC_ADD_PRELUDE_GUARD_PAGE) && !(debug_flags & MALLOC_DONT_PROTECT_PRELUDE)) {
@@ -270,16 +397,52 @@
(void *)((uintptr_t)address + size));
}
}
+#endif // MALLOC_TARGET_EXCLAVES
+}
+
+int
+mvm_madvise(void * __sized_by(sz) addr, size_t sz, int advice, unsigned debug_flags)
+{
+ return mvm_madvise_plat(addr, sz, advice, debug_flags, NULL);
+}
+
+int
+mvm_madvise_plat(void * __sized_by(sz) addr, size_t sz, int advice, unsigned debug_flags, plat_map_t *map)
+{
+#if MALLOC_TARGET_EXCLAVES
+ if (!(advice == MADV_FREE || advice == MADV_FREE_REUSABLE) ||
+ (debug_flags & (MALLOC_ADD_GUARD_PAGE_FLAGS | MALLOC_PURGEABLE))) {
+ malloc_zone_error(MALLOC_ABORT_ON_ERROR | debug_flags, true,
+ "Unsupported allocation advice %d or debug flags %u\n", advice, debug_flags);
+ }
+
+ if (!madvise_plat(map, addr, sz, LIBLIBC_MAP_HINT_UNUSED)) {
+ return 1;
+ }
+#else
+ (void)map;
+ if (madvise(addr, sz, advice) == -1) {
+ return 1;
+ }
+#endif // MALLOC_TARGET_EXCLAVES
+ return 0;
}
int
mvm_madvise_free(void *rack, void *r, uintptr_t pgLo, uintptr_t pgHi, uintptr_t *last, boolean_t scribble)
{
+ return mvm_madvise_free_plat(rack, r, pgLo, pgHi, last, scribble, NULL);
+}
+
+int
+mvm_madvise_free_plat(void *rack, void *r, uintptr_t pgLo, uintptr_t pgHi, uintptr_t *last, boolean_t scribble, plat_map_t *map)
+{
if (pgHi > pgLo) {
size_t len = pgHi - pgLo;
+ void *ptr = __unsafe_forge_bidi_indexable(void *, pgLo, len);
if (scribble && malloc_zero_policy != MALLOC_ZERO_ON_FREE) {
- memset((void *)pgLo, SCRUBBLE_BYTE, len); // Scribble on MADV_FREEd memory
+ memset(ptr, SCRUBBLE_BYTE, len); // Scribble on MADV_FREEd memory
}
#if MALLOC_TARGET_IOS
@@ -292,18 +455,24 @@
}
#endif // MALLOC_TARGET_IOS
+#if MALLOC_TARGET_EXCLAVES
+ if (mvm_madvise_plat(ptr, len, CONFIG_MADVISE_STYLE, 0, map)) {
+ return 1;
+ }
+#else
MAGMALLOC_MADVFREEREGION(rack, r, (void *)pgLo, (int)len); // DTrace USDT Probe
- if (-1 == madvise((void *)pgLo, len, CONFIG_MADVISE_STYLE)) {
+ if (mvm_madvise(ptr, len, CONFIG_MADVISE_STYLE, 0)) {
/* -1 return: VM map entry change makes this unfit for reuse. Something evil lurks. */
#if DEBUG_MADVISE
malloc_zone_error(NULL, false,
"madvise_free_range madvise(..., MADV_FREE_REUSABLE) failed for %p, length=%d\n",
(void *)pgLo, len);
-#endif
+#endif // DEBUG_MADVISE
return 1;
} else {
MALLOC_TRACE(TRACE_madvise, (uintptr_t)r, (uintptr_t)pgLo, len, CONFIG_MADVISE_STYLE);
}
+#endif // MALLOC_TARGET_EXCLAVES
}
return 0;
}
@@ -347,7 +516,8 @@
ptr -= large_vm_page_quanta_size;
}
_malloc_lock_lock(&reclaim_buffer_lock);
- id = mach_vm_reclaim_mark_free(&reclaim_buffer, ptr, size, &should_update_kernel_accounting);
+ id = mach_vm_reclaim_mark_free(&reclaim_buffer, ptr, size,
+ MACH_VM_RECLAIM_DEALLOCATE, &should_update_kernel_accounting);
_malloc_lock_unlock(&reclaim_buffer_lock);
if (should_update_kernel_accounting) {
mach_vm_reclaim_update_kernel_accounting(&reclaim_buffer);