#include <kern/page_decrypt.h>
#include <kern/queue.h>
#include <kern/thread.h>
+#include <kern/ipc_kobject.h>
#include <ipc/ipc_port.h>
#include <ipc/ipc_space.h>
-#include <default_pager/default_pager_types.h>
-#include <default_pager/default_pager_object_server.h>
-
#include <vm/vm_fault.h>
#include <vm/vm_map.h>
#include <vm/vm_pageout.h>
#include <vm/memory_object.h>
#include <vm/vm_pageout.h>
#include <vm/vm_protos.h>
+#include <vm/vm_kern.h>
/*
vm_prot_t prot);
kern_return_t apple_protect_pager_last_unmap(memory_object_t mem_obj);
+#define CRYPT_INFO_DEBUG 0
+void crypt_info_reference(struct pager_crypt_info *crypt_info);
+void crypt_info_deallocate(struct pager_crypt_info *crypt_info);
+
/*
* Vector of VM operations for this EMM.
* These routines are invoked by VM via the memory_object_*() interfaces.
apple_protect_pager_map,
apple_protect_pager_last_unmap,
NULL, /* data_reclaim */
- "apple protect pager"
+ "apple_protect"
};
/*
* the "apple protect" EMM.
*/
typedef struct apple_protect_pager {
- struct ipc_object_header pager_header; /* fake ip_kotype() */
- memory_object_pager_ops_t pager_ops; /* == &apple_protect_pager_ops */
+ /* mandatory generic header */
+ struct memory_object ap_pgr_hdr;
+
+ /* pager-specific data */
queue_chain_t pager_queue; /* next & prev pagers */
unsigned int ref_count; /* reference count */
boolean_t is_ready; /* is this pager ready ? */
boolean_t is_mapped; /* is this mem_obj mapped ? */
- memory_object_control_t pager_control; /* mem object control handle */
vm_object_t backing_object; /* VM obj w/ encrypted data */
- struct pager_crypt_info crypt;
+ vm_object_offset_t backing_offset;
+ vm_object_offset_t crypto_backing_offset; /* for key... */
+ vm_object_offset_t crypto_start;
+ vm_object_offset_t crypto_end;
+ struct pager_crypt_info *crypt_info;
} *apple_protect_pager_t;
#define APPLE_PROTECT_PAGER_NULL ((apple_protect_pager_t) NULL)
-#define pager_ikot pager_header.io_bits
/*
* List of memory objects managed by this EMM.
/*
* Maximum number of unmapped pagers we're willing to keep around.
*/
-int apple_protect_pager_cache_limit = 10;
+int apple_protect_pager_cache_limit = 20;
/*
* Statistics & counters.
/* internal prototypes */
-apple_protect_pager_t apple_protect_pager_create(vm_object_t backing_object,
- struct pager_crypt_info *crypt_info);
+apple_protect_pager_t apple_protect_pager_create(
+ vm_object_t backing_object,
+ vm_object_offset_t backing_offset,
+ vm_object_offset_t crypto_backing_offset,
+ struct pager_crypt_info *crypt_info,
+ vm_object_offset_t crypto_start,
+ vm_object_offset_t crypto_end);
apple_protect_pager_t apple_protect_pager_lookup(memory_object_t mem_obj);
void apple_protect_pager_dequeue(apple_protect_pager_t pager);
void apple_protect_pager_deallocate_internal(apple_protect_pager_t pager,
memory_object_control_reference(control);
- pager->pager_control = control;
+ pager->ap_pgr_hdr.mo_control = control;
attributes.copy_strategy = MEMORY_OBJECT_COPY_DELAY;
/* attributes.cluster_size = (1 << (CLUSTER_SHIFT + PAGE_SHIFT));*/
panic("apple_protect_pager_init: "
"memory_object_change_attributes() failed");
+#if CONFIG_SECLUDED_MEMORY
+ if (secluded_for_filecache) {
+ memory_object_mark_eligible_for_secluded(control, TRUE);
+ }
+#endif /* CONFIG_SECLUDED_MEMORY */
+
return KERN_SUCCESS;
}
*
* Handles page-in requests from VM.
*/
+int apple_protect_pager_data_request_debug = 0;
kern_return_t
apple_protect_pager_data_request(
memory_object_t mem_obj,
upl_size_t upl_size;
upl_page_info_t *upl_pl;
unsigned int pl_count;
- vm_object_t src_object, dst_object;
+ vm_object_t src_top_object, src_page_object, dst_object;
kern_return_t kr, retval;
vm_map_offset_t kernel_mapping;
vm_offset_t src_vaddr, dst_vaddr;
vm_offset_t cur_offset;
vm_offset_t offset_in_page;
- vm_map_entry_t map_entry;
kern_return_t error_code;
vm_prot_t prot;
vm_page_t src_page, top_page;
PAGER_DEBUG(PAGER_ALL, ("apple_protect_pager_data_request: %p, %llx, %x, %x\n", mem_obj, offset, length, protection_required));
retval = KERN_SUCCESS;
- src_object = VM_OBJECT_NULL;
+ src_top_object = VM_OBJECT_NULL;
+ src_page_object = VM_OBJECT_NULL;
kernel_mapping = 0;
upl = NULL;
upl_pl = NULL;
/*
* Gather in a UPL all the VM pages requested by VM.
*/
- mo_control = pager->pager_control;
+ mo_control = pager->ap_pgr_hdr.mo_control;
upl_size = length;
upl_flags =
pl_count = 0;
kr = memory_object_upl_request(mo_control,
offset, upl_size,
- &upl, NULL, NULL, upl_flags);
+ &upl, NULL, NULL, upl_flags, VM_KERN_MEMORY_SECURITY);
if (kr != KERN_SUCCESS) {
retval = kr;
goto done;
assert(dst_object != VM_OBJECT_NULL);
+#if __x86_64__ || __arm__ || __arm64__
+ /* we'll use the 1-to-1 mapping of physical memory */
+ src_vaddr = 0;
+ dst_vaddr = 0;
+#else /* __x86_64__ || __arm__ || __arm64__ */
/*
* Reserve 2 virtual pages in the kernel address space to map each
* source and destination physical pages when it's their turn to
* be processed.
*/
+ vm_map_entry_t map_entry;
+
vm_object_reference(kernel_object); /* ref. for mapping */
kr = vm_map_find_space(kernel_map,
&kernel_mapping,
2 * PAGE_SIZE_64,
0,
0,
+ VM_MAP_KERNEL_FLAGS_NONE,
&map_entry);
if (kr != KERN_SUCCESS) {
vm_object_deallocate(kernel_object);
vm_map_unlock(kernel_map);
src_vaddr = CAST_DOWN(vm_offset_t, kernel_mapping);
dst_vaddr = CAST_DOWN(vm_offset_t, kernel_mapping + PAGE_SIZE_64);
+#endif /* __x86_64__ || __arm__ || __arm64__ */
/*
* We'll map the encrypted data in the kernel address space from the
* backing VM object (itself backed by the encrypted file via
* the vnode pager).
*/
- src_object = pager->backing_object;
- assert(src_object != VM_OBJECT_NULL);
- vm_object_reference(src_object); /* to keep the source object alive */
+ src_top_object = pager->backing_object;
+ assert(src_top_object != VM_OBJECT_NULL);
+ vm_object_reference(src_top_object); /* keep the source object alive */
/*
* Fill in the contents of the pages requested by VM.
/*
* Map the source (encrypted) page in the kernel's
* virtual address space.
- * We already hold a reference on the src_object.
+ * We already hold a reference on the src_top_object.
*/
retry_src_fault:
- vm_object_lock(src_object);
- vm_object_paging_begin(src_object);
+ vm_object_lock(src_top_object);
+ vm_object_paging_begin(src_top_object);
error_code = 0;
prot = VM_PROT_READ;
src_page = VM_PAGE_NULL;
- kr = vm_fault_page(src_object,
- offset + cur_offset,
+ kr = vm_fault_page(src_top_object,
+ pager->backing_offset + offset + cur_offset,
VM_PROT_READ,
FALSE,
FALSE, /* src_page not looked up */
goto done;
case VM_FAULT_SUCCESS_NO_VM_PAGE:
/* success but no VM page: fail */
- vm_object_paging_end(src_object);
- vm_object_unlock(src_object);
+ vm_object_paging_end(src_top_object);
+ vm_object_unlock(src_top_object);
/*FALLTHROUGH*/
case VM_FAULT_MEMORY_ERROR:
/* the page is not there ! */
assert(src_page != VM_PAGE_NULL);
assert(src_page->busy);
- if (!src_page->active &&
- !src_page->inactive &&
- !src_page->throttled) {
+ if (( !VM_PAGE_NON_SPECULATIVE_PAGEABLE(src_page))) {
+
vm_page_lockspin_queues();
- if (!src_page->active &&
- !src_page->inactive &&
- !src_page->throttled) {
+
+ if (( !VM_PAGE_NON_SPECULATIVE_PAGEABLE(src_page))) {
vm_page_deactivate(src_page);
}
vm_page_unlock_queues();
}
-
+
/*
* Establish an explicit mapping of the source
* physical page.
*/
- pmap_enter(kernel_pmap,
- kernel_mapping,
- src_page->phys_page,
- VM_PROT_READ,
- VM_PROT_NONE,
- 0,
- TRUE);
+#if __x86_64__
+ src_vaddr = (vm_map_offset_t)
+ PHYSMAP_PTOV((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(src_page)
+ << PAGE_SHIFT);
+#elif __arm__ || __arm64__
+ src_vaddr = (vm_map_offset_t)
+ phystokv((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(src_page)
+ << PAGE_SHIFT);
+#else
+ kr = pmap_enter(kernel_pmap,
+ src_vaddr,
+ VM_PAGE_GET_PHYS_PAGE(src_page),
+ VM_PROT_READ,
+ VM_PROT_NONE,
+ 0,
+ TRUE);
+
+ assert(kr == KERN_SUCCESS);
+#endif
/*
* Establish an explicit pmap mapping of the destination
* physical page.
dst_pnum = (ppnum_t)
upl_phys_page(upl_pl, (int)(cur_offset / PAGE_SIZE));
assert(dst_pnum != 0);
- pmap_enter(kernel_pmap,
- kernel_mapping + PAGE_SIZE_64,
- dst_pnum,
- VM_PROT_READ | VM_PROT_WRITE,
- VM_PROT_NONE,
- 0,
- TRUE);
+#if __x86_64__
+ dst_vaddr = (vm_map_offset_t)
+ PHYSMAP_PTOV((pmap_paddr_t)dst_pnum << PAGE_SHIFT);
+#elif __arm__ || __arm64__
+ dst_vaddr = (vm_map_offset_t)
+ phystokv((pmap_paddr_t)dst_pnum << PAGE_SHIFT);
+#else
+ kr = pmap_enter(kernel_pmap,
+ dst_vaddr,
+ dst_pnum,
+ VM_PROT_READ | VM_PROT_WRITE,
+ VM_PROT_NONE,
+ 0,
+ TRUE);
+
+ assert(kr == KERN_SUCCESS);
+#endif
+ src_page_object = VM_PAGE_OBJECT(src_page);
+
+ /*
+ * Validate the original page...
+ */
+ if (src_page_object->code_signed) {
+ vm_page_validate_cs_mapped(
+ src_page,
+ (const void *) src_vaddr);
+ }
+ /*
+ * ... and transfer the results to the destination page.
+ */
+ UPL_SET_CS_VALIDATED(upl_pl, cur_offset / PAGE_SIZE,
+ src_page->cs_validated);
+ UPL_SET_CS_TAINTED(upl_pl, cur_offset / PAGE_SIZE,
+ src_page->cs_tainted);
+ UPL_SET_CS_NX(upl_pl, cur_offset / PAGE_SIZE,
+ src_page->cs_nx);
+
+ /*
+ * page_decrypt() might access a mapped file, so let's release
+ * the object lock for the source page to avoid a potential
+ * deadlock. The source page is kept busy and we have a
+ * "paging_in_progress" reference on its object, so it's safe
+ * to unlock the object here.
+ */
+ assert(src_page->busy);
+ assert(src_page_object->paging_in_progress > 0);
+ vm_object_unlock(src_page_object);
/*
* Decrypt the encrypted contents of the source page
for (offset_in_page = 0;
offset_in_page < PAGE_SIZE;
offset_in_page += 4096) {
- ret = pager->crypt.page_decrypt((const void *)
- (src_vaddr +
- offset_in_page),
- (void *)
- (dst_vaddr +
- offset_in_page),
- (offset +
- cur_offset +
- offset_in_page),
- pager->crypt.crypt_ops);
+ if (offset + cur_offset + offset_in_page <
+ pager->crypto_start ||
+ offset + cur_offset + offset_in_page >=
+ pager->crypto_end) {
+ /* not encrypted: just copy */
+ bcopy((const char *)(src_vaddr +
+ offset_in_page),
+ (char *)(dst_vaddr + offset_in_page),
+ 4096);
+ if (apple_protect_pager_data_request_debug) {
+ printf("apple_protect_data_request"
+ "(%p,0x%llx+0x%llx+0x%04llx): "
+ "out of crypto range "
+ "[0x%llx:0x%llx]: "
+ "COPY [0x%016llx 0x%016llx] "
+ "code_signed=%d "
+ "cs_validated=%d "
+ "cs_tainted=%d "
+ "cs_nx=%d\n",
+ pager,
+ offset,
+ (uint64_t) cur_offset,
+ (uint64_t) offset_in_page,
+ pager->crypto_start,
+ pager->crypto_end,
+ *(uint64_t *)(dst_vaddr+
+ offset_in_page),
+ *(uint64_t *)(dst_vaddr+
+ offset_in_page+8),
+ src_page_object->code_signed,
+ src_page->cs_validated,
+ src_page->cs_tainted,
+ src_page->cs_nx);
+ }
+ ret = 0;
+ continue;
+ }
+ ret = pager->crypt_info->page_decrypt(
+ (const void *)(src_vaddr + offset_in_page),
+ (void *)(dst_vaddr + offset_in_page),
+ ((pager->crypto_backing_offset -
+ pager->crypto_start) + /* XXX ? */
+ offset +
+ cur_offset +
+ offset_in_page),
+ pager->crypt_info->crypt_ops);
+ if (apple_protect_pager_data_request_debug) {
+ printf("apple_protect_data_request"
+ "(%p,0x%llx+0x%llx+0x%04llx): "
+ "in crypto range [0x%llx:0x%llx]: "
+ "DECRYPT offset 0x%llx="
+ "(0x%llx-0x%llx+0x%llx+0x%llx+0x%04llx)"
+ "[0x%016llx 0x%016llx] "
+ "code_signed=%d "
+ "cs_validated=%d "
+ "cs_tainted=%d "
+ "cs_nx=%d "
+ "ret=0x%x\n",
+ pager,
+ offset,
+ (uint64_t) cur_offset,
+ (uint64_t) offset_in_page,
+ pager->crypto_start, pager->crypto_end,
+ ((pager->crypto_backing_offset -
+ pager->crypto_start) +
+ offset +
+ cur_offset +
+ offset_in_page),
+ pager->crypto_backing_offset,
+ pager->crypto_start,
+ offset,
+ (uint64_t) cur_offset,
+ (uint64_t) offset_in_page,
+ *(uint64_t *)(dst_vaddr+offset_in_page),
+ *(uint64_t *)(dst_vaddr+offset_in_page+8),
+ src_page_object->code_signed,
+ src_page->cs_validated,
+ src_page->cs_tainted,
+ src_page->cs_nx,
+ ret);
+ }
if (ret) {
break;
}
* Decryption failed. Abort the fault.
*/
retval = KERN_ABORTED;
- } else {
- /*
- * Validate the original page...
- */
- if (src_page->object->code_signed) {
- vm_page_validate_cs_mapped(
- src_page,
- (const void *) src_vaddr);
- }
- /*
- * ... and transfer the results to the destination page.
- */
- UPL_SET_CS_VALIDATED(upl_pl, cur_offset / PAGE_SIZE,
- src_page->cs_validated);
- UPL_SET_CS_TAINTED(upl_pl, cur_offset / PAGE_SIZE,
- src_page->cs_tainted);
}
-
+
+ assert(VM_PAGE_OBJECT(src_page) == src_page_object);
+ assert(src_page->busy);
+ assert(src_page_object->paging_in_progress > 0);
+ vm_object_lock(src_page_object);
+
+#if __x86_64__ || __arm__ || __arm64__
+ /* we used the 1-to-1 mapping of physical memory */
+ src_vaddr = 0;
+ dst_vaddr = 0;
+#else /* __x86_64__ || __arm__ || __arm64__ */
/*
* Remove the pmap mapping of the source and destination pages
* in the kernel.
pmap_remove(kernel_pmap,
(addr64_t) kernel_mapping,
(addr64_t) (kernel_mapping + (2 * PAGE_SIZE_64)));
+#endif /* __x86_64__ || __arm__ || __arm64__ */
/*
* Cleanup the result of vm_fault_page() of the source page.
*/
- PAGE_WAKEUP_DONE(src_page);
- vm_object_paging_end(src_page->object);
- vm_object_unlock(src_page->object);
+ if (retval == KERN_SUCCESS &&
+ src_page->busy &&
+ !VM_PAGE_WIRED(src_page) &&
+ !src_page->dirty &&
+ !src_page->precious &&
+ !src_page->laundry &&
+ !src_page->cleaning) {
+ int refmod_state;
+
+ refmod_state = pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(src_page));
+
+ if (refmod_state & VM_MEM_MODIFIED) {
+ SET_PAGE_DIRTY(src_page, FALSE);
+ }
+ if (!src_page->dirty) {
+ vm_page_free_unlocked(src_page, TRUE);
+ src_page = VM_PAGE_NULL;
+ } else {
+ PAGE_WAKEUP_DONE(src_page);
+ }
+ } else {
+ PAGE_WAKEUP_DONE(src_page);
+ }
+ src_page = VM_PAGE_NULL;
+ vm_object_paging_end(src_page_object);
+ vm_object_unlock(src_page_object);
if (top_page != VM_PAGE_NULL) {
- vm_object_t top_object;
-
- top_object = top_page->object;
- vm_object_lock(top_object);
+ assert(VM_PAGE_OBJECT(top_page) == src_top_object);
+ vm_object_lock(src_top_object);
VM_PAGE_FREE(top_page);
- vm_object_paging_end(top_object);
- vm_object_unlock(top_object);
+ vm_object_paging_end(src_top_object);
+ vm_object_unlock(src_top_object);
}
}
src_vaddr = 0;
dst_vaddr = 0;
}
- if (src_object != VM_OBJECT_NULL) {
- vm_object_deallocate(src_object);
+ if (src_top_object != VM_OBJECT_NULL) {
+ vm_object_deallocate(src_top_object);
}
return retval;
vm_object_deallocate(pager->backing_object);
pager->backing_object = VM_OBJECT_NULL;
}
-
- /* deallocate any crypt module data */
- if(pager->crypt.crypt_end)
- pager->crypt.crypt_end(pager->crypt.crypt_ops);
+
+ /* one less pager using this "pager_crypt_info" */
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: deallocate %p ref %d\n",
+ __FUNCTION__,
+ pager->crypt_info,
+ pager->crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+ crypt_info_deallocate(pager->crypt_info);
+ pager->crypt_info = NULL;
/* trigger the destruction of the memory object */
- memory_object_destroy(pager->pager_control, 0);
+ memory_object_destroy(pager->ap_pgr_hdr.mo_control, 0);
}
/*
* pager structure.
*/
lck_mtx_unlock(&apple_protect_pager_lock);
- if (pager->pager_control != MEMORY_OBJECT_CONTROL_NULL) {
- memory_object_control_deallocate(pager->pager_control);
- pager->pager_control = MEMORY_OBJECT_CONTROL_NULL;
+ if (pager->ap_pgr_hdr.mo_control != MEMORY_OBJECT_CONTROL_NULL) {
+ memory_object_control_deallocate(pager->ap_pgr_hdr.mo_control);
+ pager->ap_pgr_hdr.mo_control = MEMORY_OBJECT_CONTROL_NULL;
}
kfree(pager, sizeof (*pager));
pager = APPLE_PROTECT_PAGER_NULL;
*/
kern_return_t
apple_protect_pager_synchronize(
- memory_object_t mem_obj,
- memory_object_offset_t offset,
- memory_object_size_t length,
+ __unused memory_object_t mem_obj,
+ __unused memory_object_offset_t offset,
+ __unused memory_object_size_t length,
__unused vm_sync_t sync_flags)
{
- apple_protect_pager_t pager;
-
- PAGER_DEBUG(PAGER_ALL, ("apple_protect_pager_synchronize: %p\n", mem_obj));
-
- pager = apple_protect_pager_lookup(mem_obj);
-
- memory_object_synchronize_completed(pager->pager_control,
- offset, length);
-
- return KERN_SUCCESS;
+ panic("apple_protect_pager_synchronize: memory_object_synchronize no longer supported\n");
+ return KERN_FAILURE;
}
/*
{
apple_protect_pager_t pager;
+ assert(mem_obj->mo_pager_ops == &apple_protect_pager_ops);
pager = (apple_protect_pager_t) mem_obj;
- assert(pager->pager_ops == &apple_protect_pager_ops);
assert(pager->ref_count > 0);
return pager;
}
apple_protect_pager_t
apple_protect_pager_create(
- vm_object_t backing_object,
- struct pager_crypt_info *crypt_info)
+ vm_object_t backing_object,
+ vm_object_offset_t backing_offset,
+ vm_object_offset_t crypto_backing_offset,
+ struct pager_crypt_info *crypt_info,
+ vm_object_offset_t crypto_start,
+ vm_object_offset_t crypto_end)
{
apple_protect_pager_t pager, pager2;
memory_object_control_t control;
kern_return_t kr;
+ struct pager_crypt_info *old_crypt_info;
pager = (apple_protect_pager_t) kalloc(sizeof (*pager));
if (pager == APPLE_PROTECT_PAGER_NULL) {
* we reserve the first word in the object for a fake ip_kotype
* setting - that will tell vm_map to use it as a memory object.
*/
- pager->pager_ops = &apple_protect_pager_ops;
- pager->pager_ikot = IKOT_MEMORY_OBJECT;
+ pager->ap_pgr_hdr.mo_ikot = IKOT_MEMORY_OBJECT;
+ pager->ap_pgr_hdr.mo_pager_ops = &apple_protect_pager_ops;
+ pager->ap_pgr_hdr.mo_control = MEMORY_OBJECT_CONTROL_NULL;
+
pager->is_ready = FALSE;/* not ready until it has a "name" */
- pager->ref_count = 2; /* existence + setup reference */
+ pager->ref_count = 1; /* existence reference (for the cache) */
+ pager->ref_count++; /* for the caller */
pager->is_mapped = FALSE;
- pager->pager_control = MEMORY_OBJECT_CONTROL_NULL;
pager->backing_object = backing_object;
- pager->crypt = *crypt_info;
+ pager->backing_offset = backing_offset;
+ pager->crypto_backing_offset = crypto_backing_offset;
+ pager->crypto_start = crypto_start;
+ pager->crypto_end = crypto_end;
+ pager->crypt_info = crypt_info; /* allocated by caller */
+
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: crypt_info %p [%p,%p,%p,%d]\n",
+ __FUNCTION__,
+ crypt_info,
+ crypt_info->page_decrypt,
+ crypt_info->crypt_end,
+ crypt_info->crypt_ops,
+ crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
vm_object_reference(backing_object);
+ old_crypt_info = NULL;
+
lck_mtx_lock(&apple_protect_pager_lock);
/* see if anyone raced us to create a pager for the same object */
queue_iterate(&apple_protect_pager_queue,
pager2,
apple_protect_pager_t,
pager_queue) {
- if (pager2->backing_object == backing_object) {
+ if ((pager2->crypt_info->page_decrypt !=
+ crypt_info->page_decrypt) ||
+ (pager2->crypt_info->crypt_end !=
+ crypt_info->crypt_end) ||
+ (pager2->crypt_info->crypt_ops !=
+ crypt_info->crypt_ops)) {
+ /* crypt_info contents do not match: next pager */
+ continue;
+ }
+
+ /* found a match for crypt_info ... */
+ if (old_crypt_info) {
+ /* ... already switched to that crypt_info */
+ assert(old_crypt_info == pager2->crypt_info);
+ } else if (pager2->crypt_info != crypt_info) {
+ /* ... switch to that pager's crypt_info */
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: reference %p ref %d "
+ "(create match)\n",
+ __FUNCTION__,
+ pager2->crypt_info,
+ pager2->crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+ old_crypt_info = pager2->crypt_info;
+ crypt_info_reference(old_crypt_info);
+ pager->crypt_info = old_crypt_info;
+ }
+
+ if (pager2->backing_object == backing_object &&
+ pager2->backing_offset == backing_offset &&
+ pager2->crypto_backing_offset == crypto_backing_offset &&
+ pager2->crypto_start == crypto_start &&
+ pager2->crypto_end == crypto_end) {
+ /* full match: use that pager */
break;
}
}
if (! queue_end(&apple_protect_pager_queue,
(queue_entry_t) pager2)) {
- /* while we hold the lock, transfer our setup ref to winner */
- pager2->ref_count++;
/* we lost the race, down with the loser... */
lck_mtx_unlock(&apple_protect_pager_lock);
vm_object_deallocate(pager->backing_object);
pager->backing_object = VM_OBJECT_NULL;
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: %p ref %d (create pager match)\n",
+ __FUNCTION__,
+ pager->crypt_info,
+ pager->crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+ crypt_info_deallocate(pager->crypt_info);
+ pager->crypt_info = NULL;
kfree(pager, sizeof (*pager));
/* ... and go with the winner */
pager = pager2;
/* wakeup anyone waiting for this pager to be ready */
thread_wakeup(&pager->is_ready);
+ if (old_crypt_info != NULL &&
+ old_crypt_info != crypt_info) {
+ /* we re-used an old crypt_info instead of using our new one */
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: deallocate %p ref %d "
+ "(create used old)\n",
+ __FUNCTION__,
+ crypt_info,
+ crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+ crypt_info_deallocate(crypt_info);
+ crypt_info = NULL;
+ }
+
return pager;
}
*/
memory_object_t
apple_protect_pager_setup(
- vm_object_t backing_object,
- struct pager_crypt_info *crypt_info)
+ vm_object_t backing_object,
+ vm_object_offset_t backing_offset,
+ vm_object_offset_t crypto_backing_offset,
+ struct pager_crypt_info *crypt_info,
+ vm_object_offset_t crypto_start,
+ vm_object_offset_t crypto_end)
{
apple_protect_pager_t pager;
+ struct pager_crypt_info *old_crypt_info, *new_crypt_info;
+
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: crypt_info=%p [%p,%p,%p,%d]\n",
+ __FUNCTION__,
+ crypt_info,
+ crypt_info->page_decrypt,
+ crypt_info->crypt_end,
+ crypt_info->crypt_ops,
+ crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+
+ old_crypt_info = NULL;
lck_mtx_lock(&apple_protect_pager_lock);
pager,
apple_protect_pager_t,
pager_queue) {
- if (pager->backing_object == backing_object) {
- /* For the same object we must always use the same protection options */
- if (!((pager->crypt.page_decrypt == crypt_info->page_decrypt) &&
- (pager->crypt.crypt_ops == crypt_info->crypt_ops) )) {
- lck_mtx_unlock(&apple_protect_pager_lock);
- return MEMORY_OBJECT_NULL;
- }
+ if ((pager->crypt_info->page_decrypt !=
+ crypt_info->page_decrypt) ||
+ (pager->crypt_info->crypt_end !=
+ crypt_info->crypt_end) ||
+ (pager->crypt_info->crypt_ops !=
+ crypt_info->crypt_ops)) {
+ /* no match for "crypt_info": next pager */
+ continue;
+ }
+ /* found a match for crypt_info ... */
+ if (old_crypt_info) {
+ /* ... already switched to that crypt_info */
+ assert(old_crypt_info == pager->crypt_info);
+ } else {
+ /* ... switch to that pager's crypt_info */
+ old_crypt_info = pager->crypt_info;
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: "
+ "switching crypt_info from %p [%p,%p,%p,%d] "
+ "to %p [%p,%p,%p,%d] from pager %p\n",
+ __FUNCTION__,
+ crypt_info,
+ crypt_info->page_decrypt,
+ crypt_info->crypt_end,
+ crypt_info->crypt_ops,
+ crypt_info->crypt_refcnt,
+ old_crypt_info,
+ old_crypt_info->page_decrypt,
+ old_crypt_info->crypt_end,
+ old_crypt_info->crypt_ops,
+ old_crypt_info->crypt_refcnt,
+ pager);
+ printf("CRYPT_INFO %s: %p ref %d (setup match)\n",
+ __FUNCTION__,
+ pager->crypt_info,
+ pager->crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+ crypt_info_reference(pager->crypt_info);
+ }
+
+ if (pager->backing_object == backing_object &&
+ pager->backing_offset == backing_offset &&
+ pager->crypto_backing_offset == crypto_backing_offset &&
+ pager->crypto_start == crypto_start &&
+ pager->crypto_end == crypto_end) {
+ /* full match: use that pager! */
+ assert(old_crypt_info == pager->crypt_info);
+ assert(old_crypt_info->crypt_refcnt > 1);
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: "
+ "pager match with %p crypt_info %p\n",
+ __FUNCTION__,
+ pager,
+ pager->crypt_info);
+ printf("CRYPT_INFO %s: deallocate %p ref %d "
+ "(pager match)\n",
+ __FUNCTION__,
+ old_crypt_info,
+ old_crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+ /* release the extra ref on crypt_info we got above */
+ crypt_info_deallocate(old_crypt_info);
+ assert(old_crypt_info->crypt_refcnt > 0);
+ /* give extra reference on pager to the caller */
+ assert(pager->ref_count > 0);
+ pager->ref_count++;
break;
}
}
if (queue_end(&apple_protect_pager_queue,
(queue_entry_t) pager)) {
+ lck_mtx_unlock(&apple_protect_pager_lock);
/* no existing pager for this backing object */
pager = APPLE_PROTECT_PAGER_NULL;
- } else {
- /* make sure pager doesn't disappear */
- pager->ref_count++;
- }
-
- lck_mtx_unlock(&apple_protect_pager_lock);
-
- if (pager == APPLE_PROTECT_PAGER_NULL) {
- pager = apple_protect_pager_create(backing_object, crypt_info);
+ if (old_crypt_info) {
+ /* use this old crypt_info for new pager */
+ new_crypt_info = old_crypt_info;
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: "
+ "will use old_crypt_info %p for new pager\n",
+ __FUNCTION__,
+ old_crypt_info);
+#endif /* CRYPT_INFO_DEBUG */
+ } else {
+ /* allocate a new crypt_info for new pager */
+ new_crypt_info = kalloc(sizeof (*new_crypt_info));
+ *new_crypt_info = *crypt_info;
+ new_crypt_info->crypt_refcnt = 1;
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: "
+ "will use new_crypt_info %p for new pager\n",
+ __FUNCTION__,
+ new_crypt_info);
+#endif /* CRYPT_INFO_DEBUG */
+ }
+ if (new_crypt_info == NULL) {
+ /* can't create new pager without a crypt_info */
+ } else {
+ /* create new pager */
+ pager = apple_protect_pager_create(
+ backing_object,
+ backing_offset,
+ crypto_backing_offset,
+ new_crypt_info,
+ crypto_start,
+ crypto_end);
+ }
if (pager == APPLE_PROTECT_PAGER_NULL) {
+ /* could not create a new pager */
+ if (new_crypt_info == old_crypt_info) {
+ /* release extra reference on old_crypt_info */
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: deallocate %p ref %d "
+ "(create fail old_crypt_info)\n",
+ __FUNCTION__,
+ old_crypt_info,
+ old_crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+ crypt_info_deallocate(old_crypt_info);
+ old_crypt_info = NULL;
+ } else {
+ /* release unused new_crypt_info */
+ assert(new_crypt_info->crypt_refcnt == 1);
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: deallocate %p ref %d "
+ "(create fail new_crypt_info)\n",
+ __FUNCTION__,
+ new_crypt_info,
+ new_crypt_info->crypt_refcnt);
+#endif /* CRYPT_INFO_DEBUG */
+ crypt_info_deallocate(new_crypt_info);
+ new_crypt_info = NULL;
+ }
return MEMORY_OBJECT_NULL;
}
+ lck_mtx_lock(&apple_protect_pager_lock);
+ } else {
+ assert(old_crypt_info == pager->crypt_info);
}
- lck_mtx_lock(&apple_protect_pager_lock);
while (!pager->is_ready) {
lck_mtx_sleep(&apple_protect_pager_lock,
LCK_SLEEP_DEFAULT,
apple_protect_pager_terminate_internal(pager);
}
}
+
+
+void
+crypt_info_reference(
+ struct pager_crypt_info *crypt_info)
+{
+ assert(crypt_info->crypt_refcnt != 0);
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: %p ref %d -> %d\n",
+ __FUNCTION__,
+ crypt_info,
+ crypt_info->crypt_refcnt,
+ crypt_info->crypt_refcnt + 1);
+#endif /* CRYPT_INFO_DEBUG */
+ OSAddAtomic(+1, &crypt_info->crypt_refcnt);
+}
+
+void
+crypt_info_deallocate(
+ struct pager_crypt_info *crypt_info)
+{
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: %p ref %d -> %d\n",
+ __FUNCTION__,
+ crypt_info,
+ crypt_info->crypt_refcnt,
+ crypt_info->crypt_refcnt - 1);
+#endif /* CRYPT_INFO_DEBUG */
+ OSAddAtomic(-1, &crypt_info->crypt_refcnt);
+ if (crypt_info->crypt_refcnt == 0) {
+ /* deallocate any crypt module data */
+ if (crypt_info->crypt_end) {
+ crypt_info->crypt_end(crypt_info->crypt_ops);
+ crypt_info->crypt_end = NULL;
+ }
+#if CRYPT_INFO_DEBUG
+ printf("CRYPT_INFO %s: freeing %p\n",
+ __FUNCTION__,
+ crypt_info);
+#endif /* CRYPT_INFO_DEBUG */
+ kfree(crypt_info, sizeof (*crypt_info));
+ crypt_info = NULL;
+ }
+}
projects / apple / xnu.git / blobdiff