From: P J P <ppandit@redhat.com>
To: "Philippe Mathieu-Daudé" <philmd@redhat.com>
Cc: "Fam Zheng" <fam@euphon.net>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"QEMU Developers" <qemu-devel@nongnu.org>,
"Ren Ding" <rding@gatech.edu>,
"Marc-André Lureau" <marcandre.lureau@redhat.com>
Subject: Re: [PATCH 0/2] use unsigned type for MegasasState fields
Date: Wed, 13 May 2020 00:07:06 +0530 (IST) [thread overview]
Message-ID: <nycvar.YSQ.7.76.2005122357030.1451610@xnncv> (raw)
In-Reply-To: <26201c24-c483-85a7-2f4b-b3cc56d4b8b7@redhat.com>
[-- Attachment #1: Type: text/plain, Size: 2668 bytes --]
+-- On Tue, 12 May 2020, Philippe Mathieu-Daudé wrote --+
| Cc'ing Marc-André our signed/unsigned conversion expert (with Paolo).
megasas_init_firmware
pa_lo = le32_to_cpu(initq->pi_addr_lo);
pa_hi = le32_to_cpu(initq->pi_addr_hi);
s->producer_pa = ((uint64_t) pa_hi << 32) | pa_lo;
s->reply_queue_head = ldl_le_pci_dma(pcid, s->producer_pa);
IIUC, here ldl_le_pci_dma() returns an 'uint32_t' type, but since
'reply_queue_head' is a signed int, large 'uint32_t' value turns negative.
| Do you have a reproducer?
Yes, there is a reproducer with ASAN, though it did not work for me.
Ren(CC'd) had shared this trace:
AddressSanitizer: heap-buffer-overflow on address 0x7f9159054058 at pc 0x55763514b5cd bp 0x7f9179bd6d90 sp 0x7f9179bd6d88
READ of size 8 at 0x7f9159054058 thread T2
#0 0x55763514b5cc in megasas_lookup_frame /home/ren/tmp/redacted-dbg/qemu/hw/scsi/megasas.c:449:30
#1 0x55763513205c in megasas_handle_abort /home/ren/tmp/redacted-dbg/qemu/hw/scsi/megasas.c:1904:17
#2 0x55763512d0f8 in megasas_handle_frame /home/ren/tmp/redacted-dbg/qemu/hw/scsi/megasas.c:1961:24
#3 0x55763512ba7d in megasas_mmio_write /home/ren/tmp/redacted-dbg/qemu/hw/scsi/megasas.c:2122:9
#4 0x55763515247c in megasas_port_write /home/ren/tmp/redacted-dbg/qemu/hw/scsi/megasas.c:2173:5
#5 0x557634621b3b in memory_region_write_accessor /home/ren/tmp/redacted-dbg/qemu/memory.c:483:5
#6 0x557634621741 in access_with_adjusted_size /home/ren/tmp/redacted-dbg/qemu/memory.c:544:18
#7 0x557634620498 in memory_region_dispatch_write /home/ren/tmp/redacted-dbg/qemu/memory.c:1482:16
#8 0x5576344b6b6c in flatview_write_continue /home/ren/tmp/redacted-dbg/qemu/exec.c:3161:23
#9 0x5576344a87d9 in flatview_write /home/ren/tmp/redacted-dbg/qemu/exec.c:3201:14
#10 0x5576344a8376 in address_space_write /home/ren/tmp/redacted-dbg/qemu/exec.c:3291:18
#11 0x5576344a8af4 in address_space_rw /home/ren/tmp/redacted-dbg/qemu/exec.c:3301:16
#12 0x557634689e10 in kvm_handle_io /home/ren/tmp/redacted-dbg/qemu/accel/kvm/kvm-all.c:2086:9
#13 0x557634688a45 in kvm_cpu_exec /home/ren/tmp/redacted-dbg/qemu/accel/kvm/kvm-all.c:2332:13
#14 0x5576345ee7aa in qemu_kvm_cpu_thread_fn /home/ren/tmp/redacted-dbg/qemu/cpus.c:1299:17
#15 0x557635a11509 in qemu_thread_start /home/ren/tmp/redacted-dbg/qemu/util/qemu-thread-posix.c:519:9
#16 0x7f918cec26b9 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x76b9)
#17 0x7f918c5d441c in clone /build/glibc-LK5gWL/glibc-2.23/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D
next prev parent reply other threads:[~2020-05-12 18:38 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-07 10:57 [PATCH 0/2] use unsigned type for MegasasState fields P J P
2020-05-07 10:57 ` [PATCH 1/2] megasas: use unsigned type for reply_queue_head P J P
2020-05-12 18:52 ` Peter Maydell
2020-05-13 11:20 ` P J P
2020-05-07 10:57 ` [PATCH 2/2] megasas: use unsigned type for positive numeric fields P J P
2020-05-12 18:53 ` Peter Maydell
2020-05-13 11:22 ` P J P
2020-05-12 12:21 ` [PATCH 0/2] use unsigned type for MegasasState fields P J P
2020-05-12 13:42 ` Philippe Mathieu-Daudé
2020-05-12 18:37 ` P J P [this message]
2020-05-12 19:08 ` Alexander Bulekov
2020-05-12 19:48 ` Alexander Bulekov
2020-05-12 20:59 ` Philippe Mathieu-Daudé
2020-05-12 21:00 ` Alexander Bulekov
2020-05-13 11:13 ` P J P
2020-05-13 13:49 ` P J P
2020-05-13 14:20 ` Alexander Bulekov
2020-05-13 14:53 ` P J P
2020-05-13 17:08 ` Ding, Ren
2020-05-13 19:34 ` P J P
2020-05-13 14:53 ` Alexander Bulekov
[not found] ` <BN6PR07MB341283EBBF78F86AAA995382CABE0@BN6PR07MB3412.namprd07.prod.outlook.com>
2020-05-12 20:54 ` 回复: " Philippe Mathieu-Daudé
2020-05-13 11:07 ` P J P
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