[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [qemu-xen staging-4.16] tests/qtest/fdc-test: Add a regression test for CVE-2021-20196
commit ef0cf1887ee9acb21a8d7a06e83bdbbae0fdf9e6 Author: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx> AuthorDate: Wed Nov 24 17:15:36 2021 +0100 Commit: Michael Roth <michael.roth@xxxxxxx> CommitDate: Tue Dec 14 15:05:11 2021 -0600 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@xxxxxx> Reviewed-by: Darren Kenny <darren.kenny@xxxxxxxxxx> Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx> Message-id: 20211124161536.631563-4-philmd@xxxxxxxxxx Signed-off-by: John Snow <jsnow@xxxxxxxxxx> (cherry picked from commit cc20926e9b8077bff6813efc8dcdeae90d1a3b10) Signed-off-by: Michael Roth <michael.roth@xxxxxxx> --- tests/qtest/fdc-test.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/tests/qtest/fdc-test.c b/tests/qtest/fdc-test.c index 26b69f7c5c..8f6eee84a4 100644 --- a/tests/qtest/fdc-test.c +++ b/tests/qtest/fdc-test.c @@ -32,6 +32,9 @@ /* 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 @@ -546,6 +549,40 @@ static void fuzz_registers(void) } } +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; @@ -576,6 +613,7 @@ int main(int argc, char **argv) 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(); -- generated by git-patchbot for /home/xen/git/qemu-xen.git#staging-4.16
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