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Fix user page mmu mapping and naming scheme
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parent
ab38217720
commit
4c7aa566f0
2 changed files with 31 additions and 30 deletions
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@ -1,65 +1,70 @@
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#include <stdint.h>
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#include <string.h>
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#include <string.h>
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#include "utils.h"
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#include "utils.h"
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#include "userpage.h"
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#include "userpage.h"
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#include "memory_map.h"
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#include "memory_map.h"
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#include "cache.h"
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uint64_t g_secure_page_user_address = NULL;
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static uintptr_t g_user_page_user_address = NULL;
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static inline uintptr_t get_page_for_address(void *address) {
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return ((uintptr_t)(address)) & ~0xFFF;
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}
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/* Create a user page reference for the desired address. */
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/* Create a user page reference for the desired address. */
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/* Returns 1 on success, 0 on failure. */
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/* Returns 1 on success, 0 on failure. */
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bool upage_init(upage_ref_t *upage, void *user_address) {
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bool upage_init(upage_ref_t *upage, void *user_address) {
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upage->user_page = get_page_for_address(user_address);
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upage->user_address = get_page_for_address(user_address);
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upage->secure_page = 0ULL;
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upage->secure_monitor_address = 0ULL;
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if (g_secure_page_user_address != NULL) {
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if (g_user_page_user_address != NULL) {
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/* Different physical address indicate SPL was rebooted, or another process got access to svcCallSecureMonitor. Panic. */
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/* Different physical address indicate SPL was rebooted, or another process got access to svcCallSecureMonitor. Panic. */
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if (g_secure_page_user_address != upage->user_page) {
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if (g_user_page_user_address != upage->user_address) {
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generic_panic();
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generic_panic();
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}
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}
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upage->secure_page = SECURE_USER_PAGE_ADDR;
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upage->secure_monitor_address = USER_PAGE_SECURE_MONITOR_ADDR;
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} else {
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} else {
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/* Weakly validate SPL's physically random address is in DRAM. */
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/* Weakly validate SPL's physically random address is in DRAM. */
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if (upage->user_page >> 31) {
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if (upage->user_address >> 31) {
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g_secure_page_user_address = upage->user_page;
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static const userpage_attributes = MMU_PTE_BLOCK_XN | MMU_PTE_BLOCK_INNER_SHAREBLE | MMU_PTE_BLOCK_NS | ATTRIB_MEMTYPE_NORMAL;
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mmu_map_page_range(mmu_l3_tbl, tzram_get_segment_address(TZRAM_SEGMENT_ID_USERPAGE), upage->user_page, 0x1000, MMU_PTE_BLOCK_XN | MMU_PTE_BLOCK_INNER_SHAREBLE | ATTRIB_MEMTYPE_NORMAL);
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g_user_page_user_address = upage->user_address;
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/* TODO: Invalidate the TLB to make this page readable. */
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mmu_map_page(mmu_l3_tbl, USER_PAGE_SECURE_MONITOR_ADDR, upage->user_address, userpage_attributes);
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upage->secure_page = SECURE_USER_PAGE_ADDR;
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tlb_invalidate_page_inner_shareable((void *)USER_PAGE_SECURE_MONITOR_ADDR);
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upage->secure_monitor_address = USER_PAGE_SECURE_MONITOR_ADDR;
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}
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}
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}
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}
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return upage->secure_page != 0ULL;
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return upage->secure_monitor_address != 0ULL;
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}
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}
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bool user_copy_to_secure(upage_ref_t *upage, void *secure_dst, void *user_src, size_t size) {
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bool user_copy_to_secure(upage_ref_t *upage, void *secure_dst, void *user_src, size_t size) {
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/* Fail if the page doesn't match. */
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/* Fail if the page doesn't match. */
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if (get_page_for_address(user_src) != upage->user_page) {
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if (get_page_for_address(user_src) != upage->user_address) {
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return false;
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return false;
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}
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}
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/* Fail if we go past the page boundary. */
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/* Fail if we go past the page boundary. */
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if (size != 0 && get_page_for_address(user_src + size - 1) != upage->user_page) {
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if (size != 0 && get_page_for_address(user_src + size - 1) != upage->user_address) {
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return false;
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return false;
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}
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}
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void *secure_src = (void *)(upage->secure_page + ((uint64_t)user_src - upage->user_page));
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void *secure_src = (void *)(upage->secure_monitor_address + ((uintptr_t)user_src - upage->user_address));
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memcpy(secure_dst, secure_src, size);
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memcpy(secure_dst, secure_src, size);
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return true;
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return true;
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}
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}
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bool secure_copy_to_user(upage_ref_t *upage, void *user_dst, void *secure_src, size_t size) {
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bool secure_copy_to_user(upage_ref_t *upage, void *user_dst, void *secure_src, size_t size) {
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/* Fail if the page doesn't match. */
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/* Fail if the page doesn't match. */
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if (get_page_for_address(user_dst) != upage->user_page) {
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if (get_page_for_address(user_dst) != upage->user_address) {
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return false;
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return false;
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}
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}
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/* Fail if we go past the page boundary. */
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/* Fail if we go past the page boundary. */
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if (size != 0 && get_page_for_address(user_dst + size - 1) != upage->user_page) {
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if (size != 0 && get_page_for_address(user_dst + size - 1) != upage->user_address) {
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return false;
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return false;
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}
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}
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void *secure_dst = (void *)(upage->secure_page + ((uint64_t)user_dst - upage->user_page));
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void *secure_dst = (void *)(upage->secure_monitor_address + ((uintptr_t)user_dst - upage->user_address));
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memcpy(secure_dst, secure_src, size);
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memcpy(secure_dst, secure_src, size);
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return true;
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return true;
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}
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}
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@ -1,14 +1,14 @@
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#ifndef EXOSPHERE_USERPAGE_H
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#ifndef EXOSPHERE_USERPAGE_H
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#define EXOSPHERE_USERPAGE_H
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#define EXOSPHERE_USERPAGE_H
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#include <stdbool.h>
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#include "utils.h"
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#include <stdint.h>
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#include "memory_map.h"
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#define SECURE_USER_PAGE_ADDR (0x1F01F4000ULL)
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#define USER_PAGE_SECURE_MONITOR_ADDR (tzram_get_segment_address(TZRAM_SEGMENT_ID_USERPAGE))
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typedef struct {
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typedef struct {
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uint64_t user_page;
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uintptr_t user_address;
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uint64_t secure_page;
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uintptr_t secure_monitor_address;
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} upage_ref_t;
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} upage_ref_t;
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bool upage_init(upage_ref_t *user_page, void *user_address);
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bool upage_init(upage_ref_t *user_page, void *user_address);
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@ -16,8 +16,4 @@ bool upage_init(upage_ref_t *user_page, void *user_address);
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bool user_copy_to_secure(upage_ref_t *user_page, void *secure_dst, void *user_src, size_t size);
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bool user_copy_to_secure(upage_ref_t *user_page, void *secure_dst, void *user_src, size_t size);
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bool secure_copy_to_user(upage_ref_t *user_page, void *user_dst, void *secure_src, size_t size);
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bool secure_copy_to_user(upage_ref_t *user_page, void *user_dst, void *secure_src, size_t size);
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static inline uint64_t get_page_for_address(void *address) {
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#endif
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return ((uint64_t)(address)) & 0xFFFFFFFFFFFFF000ULL;
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}
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#endif
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