* [PATCH] firmware_class: make sure fw requests contain a name
@ 2014-09-18 18:25 Kees Cook
2014-09-18 19:44 ` Sasha Levin
0 siblings, 1 reply; 2+ messages in thread
From: Kees Cook @ 2014-09-18 18:25 UTC (permalink / raw)
To: linux-kernel; +Cc: Ming Lei, Greg Kroah-Hartman, Sasha Levin
An empty firmware request name will trigger warnings when building
device names. Make sure this is caught earlier and rejected.
The warning was visible via the test_firmware.ko module interface:
echo -ne "\x00" > /sys/devices/virtual/misc/test_firmware/trigger_request
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
---
drivers/base/firmware_class.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index bf424305f3dc..3d785ebb48d3 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -1105,6 +1105,9 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
if (!firmware_p)
return -EINVAL;
+ if (!name || name[0] == '\0')
+ return -EINVAL;
+
ret = _request_firmware_prepare(&fw, name, device);
if (ret <= 0) /* error or already assigned */
goto out;
--
1.9.1
--
Kees Cook
Chrome OS Security
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] firmware_class: make sure fw requests contain a name
2014-09-18 18:25 [PATCH] firmware_class: make sure fw requests contain a name Kees Cook
@ 2014-09-18 19:44 ` Sasha Levin
0 siblings, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2014-09-18 19:44 UTC (permalink / raw)
To: Kees Cook, linux-kernel; +Cc: Ming Lei, Greg Kroah-Hartman
On 09/18/2014 02:25 PM, Kees Cook wrote:
> An empty firmware request name will trigger warnings when building
> device names. Make sure this is caught earlier and rejected.
>
> The warning was visible via the test_firmware.ko module interface:
>
> echo -ne "\x00" > /sys/devices/virtual/misc/test_firmware/trigger_request
>
> Reported-by: Sasha Levin <sasha.levin@oracle.com>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> Cc: stable@vger.kernel.org
Works for me!
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Thanks,
Sasha
^ permalink raw reply [flat|nested] 2+ messages in thread
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