On 210702 1759, Philippe Mathieu-Daudé wrote: > OSS-Fuzz found sending illegal addresses when querying the write > protection bits triggers an assertion: > > qemu-fuzz-i386: hw/sd/sd.c:824: uint32_t sd_wpbits(SDState *, uint64_t): > Assertion `wpnum < sd->wpgrps_size' failed. > ==11578== ERROR: libFuzzer: deadly signal > #8 0x7ffff628e091 in __assert_fail > #9 0x5555588f1a3c in sd_wpbits hw/sd/sd.c:824:9 > #10 0x5555588dd271 in sd_normal_command hw/sd/sd.c:1383:38 > #11 0x5555588d777c in sd_do_command hw/sd/sd.c > #12 0x555558cb25a0 in sdbus_do_command hw/sd/core.c:100:16 > #13 0x555558e02a9a in sdhci_send_command hw/sd/sdhci.c:337:12 > #14 0x555558dffa46 in sdhci_write hw/sd/sdhci.c:1187:9 > #15 0x5555598b9d76 in memory_region_write_accessor softmmu/memory.c:489:5 > > Similarly to commit 8573378e62d ("hw/sd: fix out-of-bounds check > for multi block reads"), check the address range before sending > the status of the write protection bits. > > Include the qtest reproducer provided by Alexander Bulekov: > > $ make check-qtest-i386 > ... > Running test qtest-i386/fuzz-sdcard-test > qemu-system-i386: ../hw/sd/sd.c:824: sd_wpbits: Assertion `wpnum < > sd->wpgrps_size' failed. > > Reported-by: OSS-Fuzz (Issue 29225) > Resolves: https://gitlab.com/qemu-project/qemu/-/issues/450 > Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
Reviewed-by: Alexander Bulekov <alx...@bu.edu> Thanks > --- > hw/sd/sd.c | 5 +++ > tests/qtest/fuzz-sdcard-test.c | 66 ++++++++++++++++++++++++++++++++++ > MAINTAINERS | 3 +- > tests/qtest/meson.build | 1 + > 4 files changed, 74 insertions(+), 1 deletion(-) > create mode 100644 tests/qtest/fuzz-sdcard-test.c > > diff --git a/hw/sd/sd.c b/hw/sd/sd.c > index 9c8dd11bad1..c753ae24ba9 100644 > --- a/hw/sd/sd.c > +++ b/hw/sd/sd.c > @@ -1379,6 +1379,11 @@ static sd_rsp_type_t sd_normal_command(SDState *sd, > SDRequest req) > > switch (sd->state) { > case sd_transfer_state: > + if (!address_in_range(sd, "SEND_WRITE_PROT", > + req.arg, sd->blk_len)) { > + return sd_r1; > + } > + > sd->state = sd_sendingdata_state; > *(uint32_t *) sd->data = sd_wpbits(sd, req.arg); > sd->data_start = addr; > diff --git a/tests/qtest/fuzz-sdcard-test.c b/tests/qtest/fuzz-sdcard-test.c > new file mode 100644 > index 00000000000..96602eac7e5 > --- /dev/null > +++ b/tests/qtest/fuzz-sdcard-test.c > @@ -0,0 +1,66 @@ > +/* > + * QTest fuzzer-generated testcase for sdcard device > + * > + * Copyright (c) 2021 Philippe Mathieu-Daudé <f4...@amsat.org> > + * > + * SPDX-License-Identifier: GPL-2.0-or-later > + */ > + > +#include "qemu/osdep.h" > +#include "libqos/libqtest.h" > + > +/* > + * https://gitlab.com/qemu-project/qemu/-/issues/450 > + * Used to trigger: > + * Assertion `wpnum < sd->wpgrps_size' failed. > + */ > +static void oss_fuzz_29225(void) > +{ > + QTestState *s; > + > + s = qtest_init(" -display none -m 512m -nodefaults -nographic" > + " -device sdhci-pci,sd-spec-version=3" > + " -device sd-card,drive=d0" > + " -drive > if=none,index=0,file=null-co://,format=raw,id=d0"); > + > + qtest_outl(s, 0xcf8, 0x80001010); > + qtest_outl(s, 0xcfc, 0xd0690); > + qtest_outl(s, 0xcf8, 0x80001003); > + qtest_outl(s, 0xcf8, 0x80001013); > + qtest_outl(s, 0xcfc, 0xffffffff); > + qtest_outl(s, 0xcf8, 0x80001003); > + qtest_outl(s, 0xcfc, 0x3effe00); > + > + qtest_bufwrite(s, 0xff0d062c, "\xff", 0x1); > + qtest_bufwrite(s, 0xff0d060f, "\xb7", 0x1); > + qtest_bufwrite(s, 0xff0d060a, "\xc9", 0x1); > + qtest_bufwrite(s, 0xff0d060f, "\x29", 0x1); > + qtest_bufwrite(s, 0xff0d060f, "\xc2", 0x1); > + qtest_bufwrite(s, 0xff0d0628, "\xf7", 0x1); > + qtest_bufwrite(s, 0x0, "\xe3", 0x1); > + qtest_bufwrite(s, 0x7, "\x13", 0x1); > + qtest_bufwrite(s, 0x8, "\xe3", 0x1); > + qtest_bufwrite(s, 0xf, "\xe3", 0x1); > + qtest_bufwrite(s, 0xff0d060f, "\x03", 0x1); > + qtest_bufwrite(s, 0xff0d0605, "\x01", 0x1); > + qtest_bufwrite(s, 0xff0d060b, "\xff", 0x1); > + qtest_bufwrite(s, 0xff0d060c, "\xff", 0x1); > + qtest_bufwrite(s, 0xff0d060e, "\xff", 0x1); > + qtest_bufwrite(s, 0xff0d060f, "\x06", 0x1); > + qtest_bufwrite(s, 0xff0d060f, "\x9e", 0x1); > + > + qtest_quit(s); > +} > + > +int main(int argc, char **argv) > +{ > + const char *arch = qtest_get_arch(); > + > + g_test_init(&argc, &argv, NULL); > + > + if (strcmp(arch, "i386") == 0) { > + qtest_add_func("fuzz/sdcard/oss_fuzz_29225", oss_fuzz_29225); > + } > + > + return g_test_run(); > +} > diff --git a/MAINTAINERS b/MAINTAINERS > index cfbf7ef79bc..fb33fe12200 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -1794,7 +1794,8 @@ F: include/hw/sd/sd* > F: hw/sd/core.c > F: hw/sd/sd* > F: hw/sd/ssi-sd.c > -F: tests/qtest/sd* > +F: tests/qtest/fuzz-sdcard-test.c > +F: tests/qtest/sdhci-test.c > > USB > M: Gerd Hoffmann <kra...@redhat.com> > diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build > index b03e8541700..1bb75ee7324 100644 > --- a/tests/qtest/meson.build > +++ b/tests/qtest/meson.build > @@ -21,6 +21,7 @@ > (config_all_devices.has_key('CONFIG_MEGASAS_SCSI_PCI') ? > ['fuzz-megasas-test'] : []) + \ > (config_all_devices.has_key('CONFIG_VIRTIO_SCSI') ? > ['fuzz-virtio-scsi-test'] : []) + \ > (config_all_devices.has_key('CONFIG_SB16') ? ['fuzz-sb16-test'] : []) + \ > + (config_all_devices.has_key('CONFIG_SDHCI_PCI') ? ['fuzz-sdcard-test'] : > []) + \ > [ > 'cdrom-test', > 'device-introspect-test', > -- > 2.31.1 >