| Message ID | 20220711123316.421279-1-mcascell@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] scsi/lsi53c895a: fix use-after-free in lsi_do_msgout (CVE-2022-0216) | expand |
On 220711 1433, Mauro Matteo Cascella wrote: > Set current_req to NULL to prevent reusing a free'd buffer in case of repeated > SCSI cancel requests. Thanks to Thomas Huth for suggesting the first version of > the patch and Alexander Bulekov for providing a reproducer. > > Fixes: CVE-2022-0216 > Resolves: https://gitlab.com/qemu-project/qemu/-/issues/972 > Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com> Thank you - With this, the fuzzer isn't finding any more heap-related crashes. Tested-by: Alexander Bulekov <alxndr@bu.edu> > --- > v2: > - handle CLEAR QUEUE and BUS DEVICE RESET messages > - new qtest: test_lsi_do_msgout_cancel_req > > hw/scsi/lsi53c895a.c | 2 + > tests/qtest/fuzz-lsi53c895a-test.c | 71 ++++++++++++++++++++++++++++++ > 2 files changed, 73 insertions(+) > > diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c > index c8773f73f7..6934040c59 100644 > --- a/hw/scsi/lsi53c895a.c > +++ b/hw/scsi/lsi53c895a.c > @@ -1030,6 +1030,7 @@ static void lsi_do_msgout(LSIState *s) > trace_lsi_do_msgout_abort(current_tag); > if (current_req) { > scsi_req_cancel(current_req->req); > + current_req = NULL; > } > lsi_disconnect(s); > break; > @@ -1055,6 +1056,7 @@ static void lsi_do_msgout(LSIState *s) > /* clear the current I/O process */ > if (s->current) { > scsi_req_cancel(s->current->req); > + current_req = NULL; > } > > /* As the current implemented devices scsi_disk and scsi_generic > diff --git a/tests/qtest/fuzz-lsi53c895a-test.c b/tests/qtest/fuzz-lsi53c895a-test.c > index 2e8e67859e..6872c70d3a 100644 > --- a/tests/qtest/fuzz-lsi53c895a-test.c > +++ b/tests/qtest/fuzz-lsi53c895a-test.c > @@ -8,6 +8,74 @@ > #include "qemu/osdep.h" > #include "libqtest.h" > > +/* > + * This used to trigger a UAF in lsi_do_msgout() > + * https://gitlab.com/qemu-project/qemu/-/issues/972 > + */ > +static void test_lsi_do_msgout_cancel_req(void) > +{ > + QTestState *s; > + > + s = qtest_init("-M q35 -m 4G -display none -nodefaults " > + "-device lsi53c895a,id=scsi " > + "-device scsi-hd,drive=disk0 " > + "-drive file=null-co://,id=disk0,if=none,format=raw"); > + > + qtest_outl(s, 0xcf8, 0x80000810); > + qtest_outl(s, 0xcf8, 0xc000); > + qtest_outl(s, 0xcf8, 0x80000810); > + qtest_outw(s, 0xcfc, 0x7); > + qtest_outl(s, 0xcf8, 0x80000810); > + qtest_outl(s, 0xcfc, 0xc000); > + qtest_outl(s, 0xcf8, 0x80000804); > + qtest_outw(s, 0xcfc, 0x05); > + qtest_writeb(s, 0x69736c10, 0x08); > + qtest_writeb(s, 0x69736c13, 0x58); > + qtest_writeb(s, 0x69736c1a, 0x01); > + qtest_writeb(s, 0x69736c1b, 0x06); > + qtest_writeb(s, 0x69736c22, 0x01); > + qtest_writeb(s, 0x69736c23, 0x07); > + qtest_writeb(s, 0x69736c2b, 0x02); > + qtest_writeb(s, 0x69736c48, 0x08); > + qtest_writeb(s, 0x69736c4b, 0x58); > + qtest_writeb(s, 0x69736c52, 0x04); > + qtest_writeb(s, 0x69736c53, 0x06); > + qtest_writeb(s, 0x69736c5b, 0x02); > + qtest_outl(s, 0xc02d, 0x697300); > + qtest_writeb(s, 0x5a554662, 0x01); > + qtest_writeb(s, 0x5a554663, 0x07); > + qtest_writeb(s, 0x5a55466a, 0x10); > + qtest_writeb(s, 0x5a55466b, 0x22); > + qtest_writeb(s, 0x5a55466c, 0x5a); > + qtest_writeb(s, 0x5a55466d, 0x5a); > + qtest_writeb(s, 0x5a55466e, 0x34); > + qtest_writeb(s, 0x5a55466f, 0x5a); > + qtest_writeb(s, 0x5a345a5a, 0x77); > + qtest_writeb(s, 0x5a345a5b, 0x55); > + qtest_writeb(s, 0x5a345a5c, 0x51); > + qtest_writeb(s, 0x5a345a5d, 0x27); > + qtest_writeb(s, 0x27515577, 0x41); > + qtest_outl(s, 0xc02d, 0x5a5500); > + qtest_writeb(s, 0x364001d0, 0x08); > + qtest_writeb(s, 0x364001d3, 0x58); > + qtest_writeb(s, 0x364001da, 0x01); > + qtest_writeb(s, 0x364001db, 0x26); > + qtest_writeb(s, 0x364001dc, 0x0d); > + qtest_writeb(s, 0x364001dd, 0xae); > + qtest_writeb(s, 0x364001de, 0x41); > + qtest_writeb(s, 0x364001df, 0x5a); > + qtest_writeb(s, 0x5a41ae0d, 0xf8); > + qtest_writeb(s, 0x5a41ae0e, 0x36); > + qtest_writeb(s, 0x5a41ae0f, 0xd7); > + qtest_writeb(s, 0x5a41ae10, 0x36); > + qtest_writeb(s, 0x36d736f8, 0x0c); > + qtest_writeb(s, 0x36d736f9, 0x80); > + qtest_writeb(s, 0x36d736fa, 0x0d); > + qtest_outl(s, 0xc02d, 0x364000); > + > + qtest_quit(s); > +} > + > /* > * This used to trigger the assert in lsi_do_dma() > * https://bugs.launchpad.net/qemu/+bug/697510 > @@ -44,5 +112,8 @@ int main(int argc, char **argv) > qtest_add_func("fuzz/lsi53c895a/lsi_do_dma_empty_queue", > test_lsi_do_dma_empty_queue); > > + qtest_add_func("fuzz/lsi53c895a/lsi_do_msgout_cancel_req", > + test_lsi_do_msgout_cancel_req); > + > return g_test_run(); > } > -- > 2.35.3 >
diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c index c8773f73f7..6934040c59 100644 --- a/hw/scsi/lsi53c895a.c +++ b/hw/scsi/lsi53c895a.c @@ -1030,6 +1030,7 @@ static void lsi_do_msgout(LSIState *s) trace_lsi_do_msgout_abort(current_tag); if (current_req) { scsi_req_cancel(current_req->req); + current_req = NULL; } lsi_disconnect(s); break; @@ -1055,6 +1056,7 @@ static void lsi_do_msgout(LSIState *s) /* clear the current I/O process */ if (s->current) { scsi_req_cancel(s->current->req); + current_req = NULL; } /* As the current implemented devices scsi_disk and scsi_generic diff --git a/tests/qtest/fuzz-lsi53c895a-test.c b/tests/qtest/fuzz-lsi53c895a-test.c index 2e8e67859e..6872c70d3a 100644 --- a/tests/qtest/fuzz-lsi53c895a-test.c +++ b/tests/qtest/fuzz-lsi53c895a-test.c @@ -8,6 +8,74 @@ #include "qemu/osdep.h" #include "libqtest.h" +/* + * This used to trigger a UAF in lsi_do_msgout() + * https://gitlab.com/qemu-project/qemu/-/issues/972 + */ +static void test_lsi_do_msgout_cancel_req(void) +{ + QTestState *s; + + s = qtest_init("-M q35 -m 4G -display none -nodefaults " + "-device lsi53c895a,id=scsi " + "-device scsi-hd,drive=disk0 " + "-drive file=null-co://,id=disk0,if=none,format=raw"); + + qtest_outl(s, 0xcf8, 0x80000810); + qtest_outl(s, 0xcf8, 0xc000); + qtest_outl(s, 0xcf8, 0x80000810); + qtest_outw(s, 0xcfc, 0x7); + qtest_outl(s, 0xcf8, 0x80000810); + qtest_outl(s, 0xcfc, 0xc000); + qtest_outl(s, 0xcf8, 0x80000804); + qtest_outw(s, 0xcfc, 0x05); + qtest_writeb(s, 0x69736c10, 0x08); + qtest_writeb(s, 0x69736c13, 0x58); + qtest_writeb(s, 0x69736c1a, 0x01); + qtest_writeb(s, 0x69736c1b, 0x06); + qtest_writeb(s, 0x69736c22, 0x01); + qtest_writeb(s, 0x69736c23, 0x07); + qtest_writeb(s, 0x69736c2b, 0x02); + qtest_writeb(s, 0x69736c48, 0x08); + qtest_writeb(s, 0x69736c4b, 0x58); + qtest_writeb(s, 0x69736c52, 0x04); + qtest_writeb(s, 0x69736c53, 0x06); + qtest_writeb(s, 0x69736c5b, 0x02); + qtest_outl(s, 0xc02d, 0x697300); + qtest_writeb(s, 0x5a554662, 0x01); + qtest_writeb(s, 0x5a554663, 0x07); + qtest_writeb(s, 0x5a55466a, 0x10); + qtest_writeb(s, 0x5a55466b, 0x22); + qtest_writeb(s, 0x5a55466c, 0x5a); + qtest_writeb(s, 0x5a55466d, 0x5a); + qtest_writeb(s, 0x5a55466e, 0x34); + qtest_writeb(s, 0x5a55466f, 0x5a); + qtest_writeb(s, 0x5a345a5a, 0x77); + qtest_writeb(s, 0x5a345a5b, 0x55); + qtest_writeb(s, 0x5a345a5c, 0x51); + qtest_writeb(s, 0x5a345a5d, 0x27); + qtest_writeb(s, 0x27515577, 0x41); + qtest_outl(s, 0xc02d, 0x5a5500); + qtest_writeb(s, 0x364001d0, 0x08); + qtest_writeb(s, 0x364001d3, 0x58); + qtest_writeb(s, 0x364001da, 0x01); + qtest_writeb(s, 0x364001db, 0x26); + qtest_writeb(s, 0x364001dc, 0x0d); + qtest_writeb(s, 0x364001dd, 0xae); + qtest_writeb(s, 0x364001de, 0x41); + qtest_writeb(s, 0x364001df, 0x5a); + qtest_writeb(s, 0x5a41ae0d, 0xf8); + qtest_writeb(s, 0x5a41ae0e, 0x36); + qtest_writeb(s, 0x5a41ae0f, 0xd7); + qtest_writeb(s, 0x5a41ae10, 0x36); + qtest_writeb(s, 0x36d736f8, 0x0c); + qtest_writeb(s, 0x36d736f9, 0x80); + qtest_writeb(s, 0x36d736fa, 0x0d); + qtest_outl(s, 0xc02d, 0x364000); + + qtest_quit(s); +} + /* * This used to trigger the assert in lsi_do_dma() * https://bugs.launchpad.net/qemu/+bug/697510 @@ -44,5 +112,8 @@ int main(int argc, char **argv) qtest_add_func("fuzz/lsi53c895a/lsi_do_dma_empty_queue", test_lsi_do_dma_empty_queue); + qtest_add_func("fuzz/lsi53c895a/lsi_do_msgout_cancel_req", + test_lsi_do_msgout_cancel_req); + return g_test_run(); }
Set current_req to NULL to prevent reusing a free'd buffer in case of repeated SCSI cancel requests. Thanks to Thomas Huth for suggesting the first version of the patch and Alexander Bulekov for providing a reproducer. Fixes: CVE-2022-0216 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/972 Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com> --- v2: - handle CLEAR QUEUE and BUS DEVICE RESET messages - new qtest: test_lsi_do_msgout_cancel_req hw/scsi/lsi53c895a.c | 2 + tests/qtest/fuzz-lsi53c895a-test.c | 71 ++++++++++++++++++++++++++++++ 2 files changed, 73 insertions(+)