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qemu-e2k/tests/qtest/fdc-test.c
Philippe Mathieu-Daudé cc20926e9b tests/qtest/fdc-test: Add a regression test for CVE-2021-20196 
Without the previous commit, when running 'make check-qtest-i386'
with QEMU configured with '--enable-sanitizers' we get:

  AddressSanitizer:DEADLYSIGNAL
  =================================================================
  ==287878==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000344
  ==287878==The signal is caused by a WRITE memory access.
  ==287878==Hint: address points to the zero page.
      #0 0x564b2e5bac27 in blk_inc_in_flight block/block-backend.c:1346:5
      #1 0x564b2e5bb228 in blk_pwritev_part block/block-backend.c:1317:5
      #2 0x564b2e5bcd57 in blk_pwrite block/block-backend.c:1498:11
      #3 0x564b2ca1cdd3 in fdctrl_write_data hw/block/fdc.c:2221:17
      #4 0x564b2ca1b2f7 in fdctrl_write hw/block/fdc.c:829:9
      #5 0x564b2dc49503 in portio_write softmmu/ioport.c:201:9

Add the reproducer for CVE-2021-20196.

Suggested-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20211124161536.631563-4-philmd@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
2021-12-02 01:09:38 -05:00

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/*
* Floppy test cases.
*
* Copyright (c) 2012 Kevin Wolf <kwolf@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "libqtest-single.h"
#include "qapi/qmp/qdict.h"
#include "qemu-common.h"
/* TODO actually test the results and get rid of this */
#define qmp_discard_response(...) qobject_unref(qmp(__VA_ARGS__))
#define DRIVE_FLOPPY_BLANK \
"-drive if=floppy,file=null-co://,file.read-zeroes=on,format=raw,size=1440k"
#define TEST_IMAGE_SIZE 1440 * 1024
#define FLOPPY_BASE 0x3f0
#define FLOPPY_IRQ 6
enum {
reg_sra = 0x0,
reg_srb = 0x1,
reg_dor = 0x2,
reg_msr = 0x4,
reg_dsr = 0x4,
reg_fifo = 0x5,
reg_dir = 0x7,
};
enum {
CMD_SENSE_INT = 0x08,
CMD_READ_ID = 0x0a,
CMD_SEEK = 0x0f,
CMD_VERIFY = 0x16,
CMD_READ = 0xe6,
CMD_RELATIVE_SEEK_OUT = 0x8f,
CMD_RELATIVE_SEEK_IN = 0xcf,
};
enum {
BUSY = 0x10,
NONDMA = 0x20,
RQM = 0x80,
DIO = 0x40,
DSKCHG = 0x80,
};
static char test_image[] = "/tmp/qtest.XXXXXX";
#define assert_bit_set(data, mask) g_assert_cmphex((data) & (mask), ==, (mask))
#define assert_bit_clear(data, mask) g_assert_cmphex((data) & (mask), ==, 0)
static uint8_t base = 0x70;
enum {
CMOS_FLOPPY = 0x10,
};
static void floppy_send(uint8_t byte)
{
uint8_t msr;
msr = inb(FLOPPY_BASE + reg_msr);
assert_bit_set(msr, RQM);
assert_bit_clear(msr, DIO);
outb(FLOPPY_BASE + reg_fifo, byte);
}
static uint8_t floppy_recv(void)
{
uint8_t msr;
msr = inb(FLOPPY_BASE + reg_msr);
assert_bit_set(msr, RQM | DIO);
return inb(FLOPPY_BASE + reg_fifo);
}
/* pcn: Present Cylinder Number */
static void ack_irq(uint8_t *pcn)
{
uint8_t ret;
g_assert(get_irq(FLOPPY_IRQ));
floppy_send(CMD_SENSE_INT);
floppy_recv();
ret = floppy_recv();
if (pcn != NULL) {
*pcn = ret;
}
g_assert(!get_irq(FLOPPY_IRQ));
}
static uint8_t send_read_command(uint8_t cmd)
{
uint8_t drive = 0;
uint8_t head = 0;
uint8_t cyl = 0;
uint8_t sect_addr = 1;
uint8_t sect_size = 2;
uint8_t eot = 1;
uint8_t gap = 0x1b;
uint8_t gpl = 0xff;
uint8_t msr = 0;
uint8_t st0;
uint8_t ret = 0;
floppy_send(cmd);
floppy_send(head << 2 | drive);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(cyl);
floppy_send(head);
floppy_send(sect_addr);
floppy_send(sect_size);
floppy_send(eot);
floppy_send(gap);
floppy_send(gpl);
uint8_t i = 0;
uint8_t n = 2;
for (; i < n; i++) {
msr = inb(FLOPPY_BASE + reg_msr);
if (msr == 0xd0) {
break;
}
sleep(1);
}
if (i >= n) {
return 1;
}
st0 = floppy_recv();
if (st0 != 0x40) {
ret = 1;
}
floppy_recv();
floppy_recv();
floppy_recv();
floppy_recv();
floppy_recv();
floppy_recv();
return ret;
}
static uint8_t send_read_no_dma_command(int nb_sect, uint8_t expected_st0)
{
uint8_t drive = 0;
uint8_t head = 0;
uint8_t cyl = 0;
uint8_t sect_addr = 1;
uint8_t sect_size = 2;
uint8_t eot = nb_sect;
uint8_t gap = 0x1b;
uint8_t gpl = 0xff;
uint8_t msr = 0;
uint8_t st0;
uint8_t ret = 0;
floppy_send(CMD_READ);
floppy_send(head << 2 | drive);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(cyl);
floppy_send(head);
floppy_send(sect_addr);
floppy_send(sect_size);
floppy_send(eot);
floppy_send(gap);
floppy_send(gpl);
uint16_t i = 0;
uint8_t n = 2;
for (; i < n; i++) {
msr = inb(FLOPPY_BASE + reg_msr);
if (msr == (BUSY | NONDMA | DIO | RQM)) {
break;
}
sleep(1);
}
if (i >= n) {
return 1;
}
/* Non-DMA mode */
for (i = 0; i < 512 * 2 * nb_sect; i++) {
msr = inb(FLOPPY_BASE + reg_msr);
assert_bit_set(msr, BUSY | RQM | DIO);
inb(FLOPPY_BASE + reg_fifo);
}
msr = inb(FLOPPY_BASE + reg_msr);
assert_bit_set(msr, BUSY | RQM | DIO);
g_assert(get_irq(FLOPPY_IRQ));
st0 = floppy_recv();
if (st0 != expected_st0) {
ret = 1;
}
floppy_recv();
floppy_recv();
floppy_recv();
floppy_recv();
floppy_recv();
g_assert(get_irq(FLOPPY_IRQ));
floppy_recv();
/* Check that we're back in command phase */
msr = inb(FLOPPY_BASE + reg_msr);
assert_bit_clear(msr, BUSY | DIO);
assert_bit_set(msr, RQM);
g_assert(!get_irq(FLOPPY_IRQ));
return ret;
}
static void send_seek(int cyl)
{
int drive = 0;
int head = 0;
floppy_send(CMD_SEEK);
floppy_send(head << 2 | drive);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(cyl);
ack_irq(NULL);
}
static uint8_t cmos_read(uint8_t reg)
{
outb(base + 0, reg);
return inb(base + 1);
}
static void test_cmos(void)
{
uint8_t cmos;
cmos = cmos_read(CMOS_FLOPPY);
g_assert(cmos == 0x40 || cmos == 0x50);
}
static void test_no_media_on_start(void)
{
uint8_t dir;
/* Media changed bit must be set all time after start if there is
* no media in drive. */
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
send_seek(1);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
}
static void test_read_without_media(void)
{
uint8_t ret;
ret = send_read_command(CMD_READ);
g_assert(ret == 0);
}
static void test_media_insert(void)
{
uint8_t dir;
/* Insert media in drive. DSKCHK should not be reset until a step pulse
* is sent. */
qmp_discard_response("{'execute':'blockdev-change-medium', 'arguments':{"
" 'id':'floppy0', 'filename': %s, 'format': 'raw' }}",
test_image);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
send_seek(0);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
/* Step to next track should clear DSKCHG bit. */
send_seek(1);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_clear(dir, DSKCHG);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_clear(dir, DSKCHG);
}
static void test_media_change(void)
{
uint8_t dir;
test_media_insert();
/* Eject the floppy and check that DSKCHG is set. Reading it out doesn't
* reset the bit. */
qmp_discard_response("{'execute':'eject', 'arguments':{"
" 'id':'floppy0' }}");
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
send_seek(0);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
send_seek(1);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
dir = inb(FLOPPY_BASE + reg_dir);
assert_bit_set(dir, DSKCHG);
}
static void test_sense_interrupt(void)
{
int drive = 0;
int head = 0;
int cyl = 0;
int ret = 0;
floppy_send(CMD_SENSE_INT);
ret = floppy_recv();
g_assert(ret == 0x80);
floppy_send(CMD_SEEK);
floppy_send(head << 2 | drive);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(cyl);
floppy_send(CMD_SENSE_INT);
ret = floppy_recv();
g_assert(ret == 0x20);
floppy_recv();
}
static void test_relative_seek(void)
{
uint8_t drive = 0;
uint8_t head = 0;
uint8_t cyl = 1;
uint8_t pcn;
/* Send seek to track 0 */
send_seek(0);
/* Send relative seek to increase track by 1 */
floppy_send(CMD_RELATIVE_SEEK_IN);
floppy_send(head << 2 | drive);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(cyl);
ack_irq(&pcn);
g_assert(pcn == 1);
/* Send relative seek to decrease track by 1 */
floppy_send(CMD_RELATIVE_SEEK_OUT);
floppy_send(head << 2 | drive);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(cyl);
ack_irq(&pcn);
g_assert(pcn == 0);
}
static void test_read_id(void)
{
uint8_t drive = 0;
uint8_t head = 0;
uint8_t cyl;
uint8_t st0;
uint8_t msr;
/* Seek to track 0 and check with READ ID */
send_seek(0);
floppy_send(CMD_READ_ID);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(head << 2 | drive);
msr = inb(FLOPPY_BASE + reg_msr);
if (!get_irq(FLOPPY_IRQ)) {
assert_bit_set(msr, BUSY);
assert_bit_clear(msr, RQM);
}
while (!get_irq(FLOPPY_IRQ)) {
/* qemu involves a timer with READ ID... */
clock_step(1000000000LL / 50);
}
msr = inb(FLOPPY_BASE + reg_msr);
assert_bit_set(msr, BUSY | RQM | DIO);
st0 = floppy_recv();
floppy_recv();
floppy_recv();
cyl = floppy_recv();
head = floppy_recv();
floppy_recv();
g_assert(get_irq(FLOPPY_IRQ));
floppy_recv();
g_assert(!get_irq(FLOPPY_IRQ));
g_assert_cmpint(cyl, ==, 0);
g_assert_cmpint(head, ==, 0);
g_assert_cmpint(st0, ==, head << 2);
/* Seek to track 8 on head 1 and check with READ ID */
head = 1;
cyl = 8;
floppy_send(CMD_SEEK);
floppy_send(head << 2 | drive);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(cyl);
g_assert(get_irq(FLOPPY_IRQ));
ack_irq(NULL);
floppy_send(CMD_READ_ID);
g_assert(!get_irq(FLOPPY_IRQ));
floppy_send(head << 2 | drive);
msr = inb(FLOPPY_BASE + reg_msr);
if (!get_irq(FLOPPY_IRQ)) {
assert_bit_set(msr, BUSY);
assert_bit_clear(msr, RQM);
}
while (!get_irq(FLOPPY_IRQ)) {
/* qemu involves a timer with READ ID... */
clock_step(1000000000LL / 50);
}
msr = inb(FLOPPY_BASE + reg_msr);
assert_bit_set(msr, BUSY | RQM | DIO);
st0 = floppy_recv();
floppy_recv();
floppy_recv();
cyl = floppy_recv();
head = floppy_recv();
floppy_recv();
g_assert(get_irq(FLOPPY_IRQ));
floppy_recv();
g_assert(!get_irq(FLOPPY_IRQ));
g_assert_cmpint(cyl, ==, 8);
g_assert_cmpint(head, ==, 1);
g_assert_cmpint(st0, ==, head << 2);
}
static void test_read_no_dma_1(void)
{
uint8_t ret;
outb(FLOPPY_BASE + reg_dor, inb(FLOPPY_BASE + reg_dor) & ~0x08);
send_seek(0);
ret = send_read_no_dma_command(1, 0x04);
g_assert(ret == 0);
}
static void test_read_no_dma_18(void)
{
uint8_t ret;
outb(FLOPPY_BASE + reg_dor, inb(FLOPPY_BASE + reg_dor) & ~0x08);
send_seek(0);
ret = send_read_no_dma_command(18, 0x04);
g_assert(ret == 0);
}
static void test_read_no_dma_19(void)
{
uint8_t ret;
outb(FLOPPY_BASE + reg_dor, inb(FLOPPY_BASE + reg_dor) & ~0x08);
send_seek(0);
ret = send_read_no_dma_command(19, 0x20);
g_assert(ret == 0);
}
static void test_verify(void)
{
uint8_t ret;
ret = send_read_command(CMD_VERIFY);
g_assert(ret == 0);
}
/* success if no crash or abort */
static void fuzz_registers(void)
{
unsigned int i;
for (i = 0; i < 1000; i++) {
uint8_t reg, val;
reg = (uint8_t)g_test_rand_int_range(0, 8);
val = (uint8_t)g_test_rand_int_range(0, 256);
outb(FLOPPY_BASE + reg, val);
inb(FLOPPY_BASE + reg);
}
}
static bool qtest_check_clang_sanitizer(void)
{
#if defined(__SANITIZE_ADDRESS__) || __has_feature(address_sanitizer)
return true;
#else
g_test_skip("QEMU not configured using --enable-sanitizers");
return false;
#endif
}
static void test_cve_2021_20196(void)
{
QTestState *s;
if (!qtest_check_clang_sanitizer()) {
return;
}
s = qtest_initf("-nographic -m 32M -nodefaults " DRIVE_FLOPPY_BLANK);
qtest_outw(s, 0x3f4, 0x0500);
qtest_outb(s, 0x3f5, 0x00);
qtest_outb(s, 0x3f5, 0x00);
qtest_outw(s, 0x3f4, 0x0000);
qtest_outb(s, 0x3f5, 0x00);
qtest_outw(s, 0x3f1, 0x0400);
qtest_outw(s, 0x3f4, 0x0000);
qtest_outw(s, 0x3f4, 0x0000);
qtest_outb(s, 0x3f5, 0x00);
qtest_outb(s, 0x3f5, 0x01);
qtest_outw(s, 0x3f1, 0x0500);
qtest_outb(s, 0x3f5, 0x00);
qtest_quit(s);
}
int main(int argc, char **argv)
{
int fd;
int ret;
/* Create a temporary raw image */
fd = mkstemp(test_image);
g_assert(fd >= 0);
ret = ftruncate(fd, TEST_IMAGE_SIZE);
g_assert(ret == 0);
close(fd);
/* Run the tests */
g_test_init(&argc, &argv, NULL);
qtest_start("-device floppy,id=floppy0");
qtest_irq_intercept_in(global_qtest, "ioapic");
qtest_add_func("/fdc/cmos", test_cmos);
qtest_add_func("/fdc/no_media_on_start", test_no_media_on_start);
qtest_add_func("/fdc/read_without_media", test_read_without_media);
qtest_add_func("/fdc/media_change", test_media_change);
qtest_add_func("/fdc/sense_interrupt", test_sense_interrupt);
qtest_add_func("/fdc/relative_seek", test_relative_seek);
qtest_add_func("/fdc/read_id", test_read_id);
qtest_add_func("/fdc/verify", test_verify);
qtest_add_func("/fdc/media_insert", test_media_insert);
qtest_add_func("/fdc/read_no_dma_1", test_read_no_dma_1);
qtest_add_func("/fdc/read_no_dma_18", test_read_no_dma_18);
qtest_add_func("/fdc/read_no_dma_19", test_read_no_dma_19);
qtest_add_func("/fdc/fuzz-registers", fuzz_registers);
qtest_add_func("/fdc/fuzz/cve_2021_20196", test_cve_2021_20196);
ret = g_test_run();
/* Cleanup */
qtest_end();
unlink(test_image);
return ret;
}
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