* [PATCH RESEND] scsi: megaraid_sas: fix panic on loading firmware crashdump
@ 2019-07-22 16:15 Junxiao Bi
2019-07-23 18:16 ` Sumit Saxena
2019-07-24 2:15 ` Martin K. Petersen
0 siblings, 2 replies; 3+ messages in thread
From: Junxiao Bi @ 2019-07-22 16:15 UTC (permalink / raw)
To: megaraidlinux.pdl, linux-scsi
Cc: linux-kernel, kashyap.desai, sumit.saxena,
shivasharan.srikanteshwara, martin.petersen, junxiao.bi
While loading fw crashdump in function fw_crash_buffer_show(),
left bytes in one dma chunk was not checked, if copying size
over it, overflow access will cause kernel panic.
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
---
drivers/scsi/megaraid/megaraid_sas_base.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 80ab9700f1de..3eef0858fa8e 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -3153,6 +3153,7 @@ fw_crash_buffer_show(struct device *cdev,
(struct megasas_instance *) shost->hostdata;
u32 size;
unsigned long dmachunk = CRASH_DMA_BUF_SIZE;
+ unsigned long chunk_left_bytes;
unsigned long src_addr;
unsigned long flags;
u32 buff_offset;
@@ -3176,6 +3177,8 @@ fw_crash_buffer_show(struct device *cdev,
}
size = (instance->fw_crash_buffer_size * dmachunk) - buff_offset;
+ chunk_left_bytes = dmachunk - (buff_offset % dmachunk);
+ size = (size > chunk_left_bytes) ? chunk_left_bytes : size;
size = (size >= PAGE_SIZE) ? (PAGE_SIZE - 1) : size;
src_addr = (unsigned long)instance->crash_buf[buff_offset / dmachunk] +
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH RESEND] scsi: megaraid_sas: fix panic on loading firmware crashdump
2019-07-22 16:15 [PATCH RESEND] scsi: megaraid_sas: fix panic on loading firmware crashdump Junxiao Bi
@ 2019-07-23 18:16 ` Sumit Saxena
2019-07-24 2:15 ` Martin K. Petersen
1 sibling, 0 replies; 3+ messages in thread
From: Sumit Saxena @ 2019-07-23 18:16 UTC (permalink / raw)
To: Junxiao Bi
Cc: PDL,MEGARAIDLINUX, Linux SCSI List, LKML, Kashyap Desai,
Shivasharan Srikanteshwara, Martin K. Petersen
On Mon, Jul 22, 2019 at 9:45 PM Junxiao Bi <junxiao.bi@oracle.com> wrote:
>
> While loading fw crashdump in function fw_crash_buffer_show(),
> left bytes in one dma chunk was not checked, if copying size
> over it, overflow access will cause kernel panic.
>
> Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
> ---
> drivers/scsi/megaraid/megaraid_sas_base.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
> index 80ab9700f1de..3eef0858fa8e 100644
> --- a/drivers/scsi/megaraid/megaraid_sas_base.c
> +++ b/drivers/scsi/megaraid/megaraid_sas_base.c
> @@ -3153,6 +3153,7 @@ fw_crash_buffer_show(struct device *cdev,
> (struct megasas_instance *) shost->hostdata;
> u32 size;
> unsigned long dmachunk = CRASH_DMA_BUF_SIZE;
> + unsigned long chunk_left_bytes;
> unsigned long src_addr;
> unsigned long flags;
> u32 buff_offset;
> @@ -3176,6 +3177,8 @@ fw_crash_buffer_show(struct device *cdev,
> }
>
> size = (instance->fw_crash_buffer_size * dmachunk) - buff_offset;
> + chunk_left_bytes = dmachunk - (buff_offset % dmachunk);
> + size = (size > chunk_left_bytes) ? chunk_left_bytes : size;
> size = (size >= PAGE_SIZE) ? (PAGE_SIZE - 1) : size;
>
> src_addr = (unsigned long)instance->crash_buf[buff_offset / dmachunk] +
> --
> 2.17.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH RESEND] scsi: megaraid_sas: fix panic on loading firmware crashdump
2019-07-22 16:15 [PATCH RESEND] scsi: megaraid_sas: fix panic on loading firmware crashdump Junxiao Bi
2019-07-23 18:16 ` Sumit Saxena
@ 2019-07-24 2:15 ` Martin K. Petersen
1 sibling, 0 replies; 3+ messages in thread
From: Martin K. Petersen @ 2019-07-24 2:15 UTC (permalink / raw)
To: Junxiao Bi
Cc: megaraidlinux.pdl, linux-scsi, linux-kernel, kashyap.desai,
sumit.saxena, shivasharan.srikanteshwara, martin.petersen
Junxiao,
> While loading fw crashdump in function fw_crash_buffer_show(), left
> bytes in one dma chunk was not checked, if copying size over it,
> overflow access will cause kernel panic.
Applied to 5.3/scsi-fixes. Thanks!
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-07-22 16:15 [PATCH RESEND] scsi: megaraid_sas: fix panic on loading firmware crashdump Junxiao Bi
2019-07-23 18:16 ` Sumit Saxena
2019-07-24 2:15 ` Martin K. Petersen
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