test case: x86 guest paging
Test case for x86 paging using virtual addresses mapped by Unicorn, as well as unmapped. Attempting to read/write from virtual address ranges unmapped by Unicorn wrongly causes protection faults, even when the virtual address points to read/write regions of Unicorn memory.
This commit is contained in:
Ramirez57
parent
b7d55e2d67
commit
2ab2b229ce
@ -5,7 +5,7 @@ CFLAGS += -lcmocka -lunicorn
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CFLAGS += -I ../../include
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ALL_TESTS = test_sanity test_x86 test_mem_map test_mem_high test_mem_map_ptr \
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test_tb_x86 test_multihook test_pc_change
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test_tb_x86 test_multihook test_pc_change test_x86_soft_paging
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.PHONY: all
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all: ${ALL_TESTS}
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@ -25,6 +25,7 @@ test: ${ALL_TESTS}
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./test_tb_x86
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./test_multihook
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./test_pc_change
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./test_x86_soft_paging
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test_sanity: test_sanity.c
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test_x86: test_x86.c
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@ -34,6 +35,7 @@ test_mem_high: test_mem_high.c
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test_tb_x86: test_tb_x86.c
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test_multihook: test_multihook.c
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test_pc_change: test_pc_change.c
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test_x86_soft_paging: test_x86_soft_paging.c
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${ALL_TESTS}:
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${CC} ${CFLAGS} -o $@ $^
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210
tests/unit/test_x86_soft_paging.c
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210
tests/unit/test_x86_soft_paging.c
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@ -0,0 +1,210 @@
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#include "unicorn_test.h"
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#include <inttypes.h>
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/*
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Two tests here for software paging
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Low paging: Test paging using virtual addresses already mapped by Unicorn
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High paging: Test paging using virtual addresses not mapped by Unicorn
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*/
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static void test_low_paging(void **state) {
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uc_engine *uc;
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uc_err err;
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int r_eax;
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/* The following x86 code will map emulated physical memory
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to virtual memory using pages and attempt
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to read/write from virtual memory
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Specifically, the virtual memory address range
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has been mapped by Unicorn (0x7FF000 - 0x7FFFFF)
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Memory area purposes:
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0x1000 = page directory
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0x2000 = page table (identity map first 4 MiB)
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0x3000 = page table (0x007FF000 -> 0x00004000)
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0x4000 = data area (0xBEEF)
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*/
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const uint8_t code[] = {
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/* Zero memory for page directories and page tables */
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0xBF, 0x00, 0x10, 0x00, 0x00, /* MOV EDI, 0x1000 */
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0xB9, 0x00, 0x10, 0x00, 0x00, /* MOV ECX, 0x1000 */
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0x31, 0xC0, /* XOR EAX, EAX */
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0xF3, 0xAB, /* REP STOSD */
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/* Load DWORD [0x4000] with 0xDEADBEEF to retrieve later */
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0xBF, 0x00, 0x40, 0x00, 0x00, /* MOV EDI, 0x4000 */
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0xB8, 0xEF, 0xBE, 0x00, 0x00, /* MOV EAX, 0xBEEF */
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0x89, 0x07, /* MOV [EDI], EAX */
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/* Identity map the first 4MiB of memory */
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0xB9, 0x00, 0x04, 0x00, 0x00, /* MOV ECX, 0x400 */
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0xBF, 0x00, 0x20, 0x00, 0x00, /* MOV EDI, 0x2000 */
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0xB8, 0x03, 0x00, 0x00, 0x00, /* MOV EAX, 3 */
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/* aLoop: */
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0xAB, /* STOSD */
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0x05, 0x00, 0x10, 0x00, 0x00, /* ADD EAX, 0x1000 */
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0xE2, 0xF8, /* LOOP aLoop */
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/* Map physical address 0x4000 to virtual address 0x7FF000 */
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0xBF, 0xFC, 0x3F, 0x00, 0x00, /* MOV EDI, 0x3FFC */
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0xB8, 0x03, 0x40, 0x00, 0x00, /* MOV EAX, 0x4003 */
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0x89, 0x07, /* MOV [EDI], EAX */
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/* Add page tables into page directory */
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0xBF, 0x00, 0x10, 0x00, 0x00, /* MOV EDI, 0x1000 */
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0xB8, 0x03, 0x20, 0x00, 0x00, /* MOV EAX, 0x2003 */
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0x89, 0x07, /* MOV [EDI], EAX */
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0xBF, 0x04, 0x10, 0x00, 0x00, /* MOV EDI, 0x1004 */
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0xB8, 0x03, 0x30, 0x00, 0x00, /* MOV EAX, 0x3003 */
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0x89, 0x07, /* MOV [EDI], EAX */
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/* Load the page directory register */
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0xB8, 0x00, 0x10, 0x00, 0x00, /* MOV EAX, 0x1000 */
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0x0F, 0x22, 0xD8, /* MOV CR3, EAX */
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/* Enable paging */
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0x0F, 0x20, 0xC0, /* MOV EAX, CR0 */
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0x0D, 0x00, 0x00, 0x00, 0x80, /* OR EAX, 0x80000000 */
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0x0F, 0x22, 0xC0, /* MOV CR0, EAX */
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/* Clear EAX */
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0x31, 0xC0, /* XOR EAX, EAX */
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/* Load using virtual memory address; EAX = 0xBEEF */
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0xBE, 0x00, 0xF0, 0x7F, 0x00, /* MOV ESI, 0x7FF000 */
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0x8B, 0x06, /* MOV EAX, [ESI] */
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0xF4, /* HLT */
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};
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/* Initialise X86-32bit mode */
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err = uc_open(UC_ARCH_X86, UC_MODE_32, &uc);
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uc_assert_success(err);
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/* Map 8MB of memory at base address 0 */
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err = uc_mem_map(uc, 0, (8 * 1024 * 1024), UC_PROT_ALL);
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uc_assert_success(err);
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/* Write code into memory at address 0 */
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err = uc_mem_write(uc, 0, code, sizeof(code));
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uc_assert_success(err);
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/* Start emulation */
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err = uc_emu_start(uc, 0, sizeof(code), 0, 0);
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uc_assert_success(err);
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/* The code should have loaded 0xBEEF into EAX */
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uc_reg_read(uc, UC_X86_REG_EAX, &r_eax);
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assert_int_equal(r_eax, 0xBEEF);
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uc_close(uc);
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}
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/****************************************************************************/
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static void test_high_paging(void **state) {
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uc_engine *uc;
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uc_err err;
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int r_eax;
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/* The following x86 code will map emulated physical memory
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to virtual memory using pages and attempt
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to read/write from virtual memory
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Specifically, the virtual memory address range
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has not been mapped by UC (0xFFFFF000 - 0xFFFFFFFF)
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Memory area purposes:
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0x1000 = page directory
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0x2000 = page table (identity map first 4 MiB)
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0x3000 = page table (0xFFFFF000 -> 0x00004000)
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0x4000 = data area (0xDEADBEEF)
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*/
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const uint8_t code[] = {
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/* Zero memory for page directories and page tables */
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0xBF, 0x00, 0x10, 0x00, 0x00, /* MOV EDI, 0x1000 */
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0xB9, 0x00, 0x10, 0x00, 0x00, /* MOV ECX, 0x1000 */
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0x31, 0xC0, /* XOR EAX, EAX */
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0xF3, 0xAB, /* REP STOSD */
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/* Load DWORD [0x4000] with 0xDEADBEEF to retrieve later */
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0xBF, 0x00, 0x40, 0x00, 0x00, /* MOV EDI, 0x4000 */
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0xB8, 0xEF, 0xBE, 0x00, 0x00, /* MOV EAX, 0xBEEF */
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0x89, 0x07, /* MOV [EDI], EAX */
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/* Identity map the first 4MiB of memory */
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0xB9, 0x00, 0x04, 0x00, 0x00, /* MOV ECX, 0x400 */
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0xBF, 0x00, 0x20, 0x00, 0x00, /* MOV EDI, 0x2000 */
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0xB8, 0x03, 0x00, 0x00, 0x00, /* MOV EAX, 3 */
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/* aLoop: */
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0xAB, /* STOSD */
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0x05, 0x00, 0x10, 0x00, 0x00, /* ADD EAX, 0x1000 */
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0xE2, 0xF8, /* LOOP aLoop */
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/* Map physical address 0x4000 to virtual address 0xFFFFF000 */
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0xBF, 0xFC, 0x3F, 0x00, 0x00, /* MOV EDI, 0x3FFC */
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0xB8, 0x03, 0x40, 0x00, 0x00, /* MOV EAX, 0x4003 */
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0x89, 0x07, /* MOV [EDI], EAX */
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/* Add page tables into page directory */
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0xBF, 0x00, 0x10, 0x00, 0x00, /* MOV EDI, 0x1000 */
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0xB8, 0x03, 0x20, 0x00, 0x00, /* MOV EAX, 0x2003 */
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0x89, 0x07, /* MOV [EDI], EAX */
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0xBF, 0xFC, 0x1F, 0x00, 0x00, /* MOV EDI, 0x1FFC */
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0xB8, 0x03, 0x30, 0x00, 0x00, /* MOV EAX, 0x3003 */
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0x89, 0x07, /* MOV [EDI], EAX */
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/* Load the page directory register */
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0xB8, 0x00, 0x10, 0x00, 0x00, /* MOV EAX, 0x1000 */
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0x0F, 0x22, 0xD8, /* MOV CR3, EAX */
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/* Enable paging */
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0x0F, 0x20, 0xC0, /* MOV EAX, CR0 */
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0x0D, 0x00, 0x00, 0x00, 0x80, /* OR EAX, 0x80000000 */
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0x0F, 0x22, 0xC0, /* MOV CR0, EAX */
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/* Clear EAX */
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0x31, 0xC0, /* XOR EAX, EAX */
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/* Load using virtual memory address; EAX = 0xBEEF */
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0xBE, 0x00, 0xF0, 0xFF, 0xFF, /* MOV ESI, 0xFFFFF000 */
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0x8B, 0x06, /* MOV EAX, [ESI] */
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0xF4, /* HLT */
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};
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/* Initialise X86-32bit mode */
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err = uc_open(UC_ARCH_X86, UC_MODE_32, &uc);
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uc_assert_success(err);
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/* Map 4MB of memory at base address 0 */
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err = uc_mem_map(uc, 0, (4 * 1024 * 1024), UC_PROT_ALL);
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uc_assert_success(err);
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/* Write code into memory at address 0 */
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err = uc_mem_write(uc, 0, code, sizeof(code));
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uc_assert_success(err);
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/* Start emulation */
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err = uc_emu_start(uc, 0, sizeof(code), 0, 0);
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uc_assert_success(err);
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/* The code should have loaded 0xBEEF into EAX */
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uc_reg_read(uc, UC_X86_REG_EAX, &r_eax);
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assert_int_equal(r_eax, 0xBEEF);
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uc_close(uc);
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}
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/****************************************************************************/
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int main(void) {
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const struct CMUnitTests tests[] = {
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cmocka_unit_test(test_low_paging),
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cmocka_unit_test(test_high_paging),
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};
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return cmocka_run_group_tests(tests, NULL, NULL);
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}
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