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Code Issues Releases Activity

Fix user page mmu mapping and naming scheme

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This commit is contained in:
TuxSH 2018-02-25 15:05:52 +01:00
parent ab38217720
commit 4c7aa566f0
2 changed files with 31 additions and 30 deletions
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43
exosphere/userpage.c
View file

@ -1,65 +1,70 @@
#include <stdint.h>
#include <string.h> #include <string.h>
#include "utils.h" #include "utils.h"
#include "userpage.h" #include "userpage.h"
#include "memory_map.h" #include "memory_map.h"
#include "cache.h"
uint64_t g_secure_page_user_address = NULL; static uintptr_t g_user_page_user_address = NULL;
static inline uintptr_t get_page_for_address(void *address) {
return ((uintptr_t)(address)) & ~0xFFF;
}
/* Create a user page reference for the desired address. */ /* Create a user page reference for the desired address. */
/* Returns 1 on success, 0 on failure. */ /* Returns 1 on success, 0 on failure. */
bool upage_init(upage_ref_t *upage, void *user_address) { bool upage_init(upage_ref_t *upage, void *user_address) {
upage->user_page = get_page_for_address(user_address); upage->user_address = get_page_for_address(user_address);
upage->secure_page = 0ULL; upage->secure_monitor_address = 0ULL;
if (g_secure_page_user_address != NULL) { if (g_user_page_user_address != NULL) {
/* Different physical address indicate SPL was rebooted, or another process got access to svcCallSecureMonitor. Panic. */ /* Different physical address indicate SPL was rebooted, or another process got access to svcCallSecureMonitor. Panic. */
if (g_secure_page_user_address != upage->user_page) { if (g_user_page_user_address != upage->user_address) {
generic_panic(); generic_panic();
} }
upage->secure_page = SECURE_USER_PAGE_ADDR; upage->secure_monitor_address = USER_PAGE_SECURE_MONITOR_ADDR;
} else { } else {
/* Weakly validate SPL's physically random address is in DRAM. */ /* Weakly validate SPL's physically random address is in DRAM. */
if (upage->user_page >> 31) { if (upage->user_address >> 31) {
g_secure_page_user_address = upage->user_page; static const userpage_attributes = MMU_PTE_BLOCK_XN | MMU_PTE_BLOCK_INNER_SHAREBLE | MMU_PTE_BLOCK_NS | ATTRIB_MEMTYPE_NORMAL;
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); g_user_page_user_address = upage->user_address;
/* TODO: Invalidate the TLB to make this page readable. */ mmu_map_page(mmu_l3_tbl, USER_PAGE_SECURE_MONITOR_ADDR, upage->user_address, userpage_attributes);
upage->secure_page = SECURE_USER_PAGE_ADDR; tlb_invalidate_page_inner_shareable((void *)USER_PAGE_SECURE_MONITOR_ADDR);
upage->secure_monitor_address = USER_PAGE_SECURE_MONITOR_ADDR;
} }
} }
return upage->secure_page != 0ULL; return upage->secure_monitor_address != 0ULL;
} }
bool user_copy_to_secure(upage_ref_t *upage, void *secure_dst, void *user_src, size_t size) { bool user_copy_to_secure(upage_ref_t *upage, void *secure_dst, void *user_src, size_t size) {
/* Fail if the page doesn't match. */ /* Fail if the page doesn't match. */
if (get_page_for_address(user_src) != upage->user_page) { if (get_page_for_address(user_src) != upage->user_address) {
return false; return false;
} }
/* Fail if we go past the page boundary. */ /* Fail if we go past the page boundary. */
if (size != 0 && get_page_for_address(user_src + size - 1) != upage->user_page) { if (size != 0 && get_page_for_address(user_src + size - 1) != upage->user_address) {
return false; return false;
} }
void *secure_src = (void *)(upage->secure_page + ((uint64_t)user_src - upage->user_page)); void *secure_src = (void *)(upage->secure_monitor_address + ((uintptr_t)user_src - upage->user_address));
memcpy(secure_dst, secure_src, size); memcpy(secure_dst, secure_src, size);
return true; return true;
} }
bool secure_copy_to_user(upage_ref_t *upage, void *user_dst, void *secure_src, size_t size) { bool secure_copy_to_user(upage_ref_t *upage, void *user_dst, void *secure_src, size_t size) {
/* Fail if the page doesn't match. */ /* Fail if the page doesn't match. */
if (get_page_for_address(user_dst) != upage->user_page) { if (get_page_for_address(user_dst) != upage->user_address) {
return false; return false;
} }
/* Fail if we go past the page boundary. */ /* Fail if we go past the page boundary. */
if (size != 0 && get_page_for_address(user_dst + size - 1) != upage->user_page) { if (size != 0 && get_page_for_address(user_dst + size - 1) != upage->user_address) {
return false; return false;
} }
void *secure_dst = (void *)(upage->secure_page + ((uint64_t)user_dst - upage->user_page)); void *secure_dst = (void *)(upage->secure_monitor_address + ((uintptr_t)user_dst - upage->user_address));
memcpy(secure_dst, secure_src, size); memcpy(secure_dst, secure_src, size);
return true; return true;
} }

14
exosphere/userpage.h
View file

@ -1,14 +1,14 @@
#ifndef EXOSPHERE_USERPAGE_H #ifndef EXOSPHERE_USERPAGE_H
#define EXOSPHERE_USERPAGE_H #define EXOSPHERE_USERPAGE_H
#include <stdbool.h> #include "utils.h"
#include <stdint.h> #include "memory_map.h"
#define SECURE_USER_PAGE_ADDR (0x1F01F4000ULL) #define USER_PAGE_SECURE_MONITOR_ADDR (tzram_get_segment_address(TZRAM_SEGMENT_ID_USERPAGE))
typedef struct { typedef struct {
uint64_t user_page; uintptr_t user_address;
uint64_t secure_page; uintptr_t secure_monitor_address;
} upage_ref_t; } upage_ref_t;
bool upage_init(upage_ref_t *user_page, void *user_address); bool upage_init(upage_ref_t *user_page, void *user_address);
@ -16,8 +16,4 @@ bool upage_init(upage_ref_t *user_page, void *user_address);
bool user_copy_to_secure(upage_ref_t *user_page, void *secure_dst, void *user_src, size_t size); bool user_copy_to_secure(upage_ref_t *user_page, void *secure_dst, void *user_src, size_t size);
bool secure_copy_to_user(upage_ref_t *user_page, void *user_dst, void *secure_src, size_t size); bool secure_copy_to_user(upage_ref_t *user_page, void *user_dst, void *secure_src, size_t size);
static inline uint64_t get_page_for_address(void *address) {
return ((uint64_t)(address)) & 0xFFFFFFFFFFFFF000ULL;
}
#endif #endif