From: "Philippe Mathieu-Daudé" <f4bug@amsat.org>
To: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>,
qemu-devel@nongnu.org, alxndr@bu.edu, laurent@vivier.eu,
pbonzini@redhat.com
Subject: Re: [PATCH v3 08/11] esp: don't overflow cmdfifo in get_cmd()
Date: Thu, 1 Apr 2021 10:19:36 +0200 [thread overview]
Message-ID: <1aa39496-e535-5e38-552b-1e314fcb9905@amsat.org> (raw)
In-Reply-To: <20210401074933.9923-9-mark.cave-ayland@ilande.co.uk>
On 4/1/21 9:49 AM, Mark Cave-Ayland wrote:
> If the guest tries to read a CDB using DMA and cmdfifo is not empty then it is
> possible to overflow cmdfifo.
>
> Since this can only occur by issuing deliberately incorrect instruction
> sequences, ensure that the maximum length of the CDB transferred to cmdfifo is
> limited to the available free space within cmdfifo.
>
> Buglink: https://bugs.launchpad.net/qemu/+bug/1909247
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
> hw/scsi/esp.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
> index 7f49522e1d..c547c60395 100644
> --- a/hw/scsi/esp.c
> +++ b/hw/scsi/esp.c
> @@ -243,6 +243,7 @@ static uint32_t get_cmd(ESPState *s, uint32_t maxlen)
> }
> if (s->dma_memory_read) {
> s->dma_memory_read(s->dma_opaque, buf, dmalen);
> + dmalen = MIN(fifo8_num_free(&s->fifo), dmalen);
Ditto, GUEST_ERRORS?
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> fifo8_push_all(&s->cmdfifo, buf, dmalen);
> } else {
> if (esp_select(s) < 0) {
>
next prev parent reply other threads:[~2021-04-01 8:21 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 7:49 [PATCH v3 00/11] esp: fix asserts/segfaults discovered by fuzzer Mark Cave-Ayland
2021-04-01 7:49 ` [PATCH v3 01/11] esp: always check current_req is not NULL before use in DMA callbacks Mark Cave-Ayland
2021-04-01 7:49 ` [PATCH v3 02/11] esp: rework write_response() to avoid using the FIFO for DMA transactions Mark Cave-Ayland
2021-04-01 8:26 ` Philippe Mathieu-Daudé
2021-04-01 7:49 ` [PATCH v3 03/11] esp: consolidate esp_cmdfifo_push() into esp_fifo_push() Mark Cave-Ayland
2021-04-01 8:15 ` Philippe Mathieu-Daudé
2021-04-01 8:50 ` Mark Cave-Ayland
2021-04-01 9:16 ` Philippe Mathieu-Daudé
2021-04-01 7:49 ` [PATCH v3 04/11] esp: consolidate esp_cmdfifo_pop() into esp_fifo_pop() Mark Cave-Ayland
2021-04-01 8:15 ` Philippe Mathieu-Daudé
2021-04-01 7:49 ` [PATCH v3 05/11] esp: introduce esp_fifo_pop_buf() and use it instead of fifo8_pop_buf() Mark Cave-Ayland
2021-04-01 9:34 ` Philippe Mathieu-Daudé
2021-04-01 10:51 ` Mark Cave-Ayland
2021-04-01 18:05 ` Philippe Mathieu-Daudé
2021-04-01 7:49 ` [PATCH v3 06/11] esp: ensure cmdfifo is not empty and current_dev is non-NULL Mark Cave-Ayland
2021-04-01 8:17 ` Philippe Mathieu-Daudé
2021-04-01 7:49 ` [PATCH v3 07/11] esp: don't underflow cmdfifo in do_cmd() Mark Cave-Ayland
2021-04-01 8:19 ` Philippe Mathieu-Daudé
2021-04-01 8:51 ` Mark Cave-Ayland
2021-04-01 7:49 ` [PATCH v3 08/11] esp: don't overflow cmdfifo in get_cmd() Mark Cave-Ayland
2021-04-01 8:19 ` Philippe Mathieu-Daudé [this message]
2021-04-01 8:56 ` Mark Cave-Ayland
2021-04-01 7:49 ` [PATCH v3 09/11] esp: don't overflow cmdfifo if TC is larger than the cmdfifo size Mark Cave-Ayland
2021-04-01 7:49 ` [PATCH v3 10/11] esp: don't reset async_len directly in esp_select() if cancelling request Mark Cave-Ayland
2021-04-01 7:49 ` [PATCH v3 11/11] tests/qtest: add tests for am53c974 device Mark Cave-Ayland
2021-04-01 16:55 ` Alexander Bulekov
2021-04-02 7:29 ` Mark Cave-Ayland
2021-04-01 17:00 ` [PATCH v3 00/11] esp: fix asserts/segfaults discovered by fuzzer Alexander Bulekov
2021-04-02 7:35 ` Mark Cave-Ayland
2021-04-02 16:20 ` [PATCH] tests/qtest: add one more test for the am53c974 Alexander Bulekov
2021-04-03 14:38 ` Mark Cave-Ayland
2021-04-07 12:08 ` Mark Cave-Ayland
2021-04-07 13:04 ` Mark Cave-Ayland
2021-04-07 14:49 ` Alexander Bulekov
2021-04-07 15:11 ` Mark Cave-Ayland
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