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* [PATCH] scsi_dh: avoid allowing dh_state to pass format specs when requesting a module
@ 2015-09-24  1:08 Sasha Levin
  2015-09-24  7:49 ` Johannes Thumshirn
  0 siblings, 1 reply; 2+ messages in thread
From: Sasha Levin @ 2015-09-24  1:08 UTC (permalink / raw)
  To: JBottomley; +Cc: linux-scsi, linux-kernel, Sasha Levin

A malicious string passed from userspace might contain format specifiers which
request_module() might try to handle, which is bad.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
 drivers/scsi/scsi_dh.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
index edb044a..24be260 100644
--- a/drivers/scsi/scsi_dh.c
+++ b/drivers/scsi/scsi_dh.c
@@ -111,7 +111,7 @@ static struct scsi_device_handler *scsi_dh_lookup(const char *name)
 
 	dh = __scsi_dh_lookup(name);
 	if (!dh) {
-		request_module(name);
+		request_module("%s", name);
 		dh = __scsi_dh_lookup(name);
 	}
 
-- 
1.7.10.4

^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH] scsi_dh: avoid allowing dh_state to pass format specs when requesting a module
  2015-09-24  1:08 [PATCH] scsi_dh: avoid allowing dh_state to pass format specs when requesting a module Sasha Levin
@ 2015-09-24  7:49 ` Johannes Thumshirn
  0 siblings, 0 replies; 2+ messages in thread
From: Johannes Thumshirn @ 2015-09-24  7:49 UTC (permalink / raw)
  To: Sasha Levin; +Cc: JBottomley, linux-scsi, linux-kernel

Sasha Levin <sasha.levin@oracle.com> writes:

> A malicious string passed from userspace might contain format specifiers which
> request_module() might try to handle, which is bad.
>
> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
> ---
>  drivers/scsi/scsi_dh.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
> index edb044a..24be260 100644
> --- a/drivers/scsi/scsi_dh.c
> +++ b/drivers/scsi/scsi_dh.c
> @@ -111,7 +111,7 @@ static struct scsi_device_handler *scsi_dh_lookup(const char *name)
>  
>  	dh = __scsi_dh_lookup(name);
>  	if (!dh) {
> -		request_module(name);
> +		request_module("%s", name);
>  		dh = __scsi_dh_lookup(name);
>  	}

Good catch.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>

-- 
Johannes Thumshirn                                           Storage
jthumshirn@suse.de                                 +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600  D0D0 0393 969D 2D76 0850

^ permalink raw reply	[flat|nested] 2+ messages in thread

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