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Code Issues Releases Activity

Strongly validate SPL's buffer address

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TuxSH 2018-03-01 12:30:24 +01:00
parent 9553c69c8f
commit 568781bc7e
1 changed files with 2 additions and 2 deletions
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4
exosphere/src/userpage.c
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@ -24,8 +24,8 @@ bool upage_init(upage_ref_t *upage, void *user_address) {
}
upage->secure_monitor_address = USER_PAGE_SECURE_MONITOR_ADDR;
} else {
/* Weakly validate SPL's physically random address is in DRAM. */
if (upage->user_address >> 31) {
/* Validate SPL's physically random address (must be in DRAM (supports up to 6GB, retail console have 4GB) and page-aligned). */
if ((upage->user_address - 0x80000000ull) < (6ull << 30) && ((uintptr_t)user_address & 0xFFF) == 0) {
static const uint64_t userpage_attributes = MMU_PTE_BLOCK_XN | MMU_PTE_BLOCK_INNER_SHAREBLE | MMU_PTE_BLOCK_NS | ATTRIB_MEMTYPE_NORMAL;
uintptr_t *mmu_l3_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
g_user_page_user_address = upage->user_address;