* [PATCH] media: amphion: Replace zero-length array with flexible-array member
@ 2022-05-27 21:29 Kees Cook
2022-05-27 22:08 ` Gustavo A. R. Silva
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Kees Cook @ 2022-05-27 21:29 UTC (permalink / raw)
To: Ming Qian
Cc: Kees Cook, Shijie Qin, Zhou Peng, Mauro Carvalho Chehab,
Gustavo A . R . Silva, linux-media, Hans Verkuil,
Nicolas Dufresne, linux-kernel, linux-hardening
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should no
longer be used[2][3].
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
[3] https://github.com/KSPP/linux/issues/78
Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
Cc: Ming Qian <ming.qian@nxp.com>
Cc: Shijie Qin <shijie.qin@nxp.com>
Cc: Zhou Peng <eagle.zhou@nxp.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Cc: linux-media@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/media/platform/amphion/vpu_dbg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
index da62bd718fb8..f72c8a506b22 100644
--- a/drivers/media/platform/amphion/vpu_dbg.c
+++ b/drivers/media/platform/amphion/vpu_dbg.c
@@ -27,7 +27,7 @@ struct print_buf_desc {
u32 bytes;
u32 read;
u32 write;
- char buffer[0];
+ char buffer[];
};
static char *vb2_stat_name[] = {
--
2.32.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] media: amphion: Replace zero-length array with flexible-array member
2022-05-27 21:29 [PATCH] media: amphion: Replace zero-length array with flexible-array member Kees Cook
@ 2022-05-27 22:08 ` Gustavo A. R. Silva
2022-05-30 5:15 ` [EXT] " Ming Qian
2022-05-30 11:27 ` Tommaso Merciai
2 siblings, 0 replies; 4+ messages in thread
From: Gustavo A. R. Silva @ 2022-05-27 22:08 UTC (permalink / raw)
To: Kees Cook
Cc: Ming Qian, Shijie Qin, Zhou Peng, Mauro Carvalho Chehab,
linux-media, Hans Verkuil, Nicolas Dufresne, linux-kernel,
linux-hardening
On Fri, May 27, 2022 at 02:29:53PM -0700, Kees Cook wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should no
> longer be used[2][3].
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> [3] https://github.com/KSPP/linux/issues/78
>
> Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
> Cc: Ming Qian <ming.qian@nxp.com>
> Cc: Shijie Qin <shijie.qin@nxp.com>
> Cc: Zhou Peng <eagle.zhou@nxp.com>
> Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
> Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
> Cc: linux-media@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Thanks
--
Gustavo
> ---
> drivers/media/platform/amphion/vpu_dbg.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
> index da62bd718fb8..f72c8a506b22 100644
> --- a/drivers/media/platform/amphion/vpu_dbg.c
> +++ b/drivers/media/platform/amphion/vpu_dbg.c
> @@ -27,7 +27,7 @@ struct print_buf_desc {
> u32 bytes;
> u32 read;
> u32 write;
> - char buffer[0];
> + char buffer[];
> };
>
> static char *vb2_stat_name[] = {
> --
> 2.32.0
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: [EXT] [PATCH] media: amphion: Replace zero-length array with flexible-array member
2022-05-27 21:29 [PATCH] media: amphion: Replace zero-length array with flexible-array member Kees Cook
2022-05-27 22:08 ` Gustavo A. R. Silva
@ 2022-05-30 5:15 ` Ming Qian
2022-05-30 11:27 ` Tommaso Merciai
2 siblings, 0 replies; 4+ messages in thread
From: Ming Qian @ 2022-05-30 5:15 UTC (permalink / raw)
To: Kees Cook
Cc: Shijie Qin, Eagle Zhou, Mauro Carvalho Chehab,
Gustavo A . R . Silva, linux-media, Hans Verkuil,
Nicolas Dufresne, linux-kernel, linux-hardening
> From: Kees Cook <keescook@chromium.org>
> Sent: 2022年5月28日 5:30
> To: Ming Qian <ming.qian@nxp.com>
> Cc: Kees Cook <keescook@chromium.org>; Shijie Qin <shijie.qin@nxp.com>;
> Eagle Zhou <eagle.zhou@nxp.com>; Mauro Carvalho Chehab
> <mchehab@kernel.org>; Gustavo A . R . Silva <gustavoars@kernel.org>;
> linux-media@vger.kernel.org; Hans Verkuil <hverkuil-cisco@xs4all.nl>; Nicolas
> Dufresne <nicolas.dufresne@collabora.com>; linux-kernel@vger.kernel.org;
> linux-hardening@vger.kernel.org
> Subject: [EXT] [PATCH] media: amphion: Replace zero-length array with
> flexible-array member
>
> Caution: EXT Email
>
> There is a regular need in the kernel to provide a way to declare having a
> dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these cases.
> The older style of one-element or zero-length arrays should no longer be
> used[2][3].
>
> [1]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wiki
> pedia.org%2Fwiki%2FFlexible_array_member&data=05%7C01%7Cming.q
> ian%40nxp.com%7C8f4e000999114f77682908da40280bd5%7C686ea1d3bc2
> b4c6fa92cd99c5c301635%7C0%7C0%7C637892837984973240%7CUnknown
> %7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haW
> wiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=DjFIwJC45pAqdCP5EE
> QE7n5F8GH45NdWrQoXunNEhZY%3D&reserved=0
> [2]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ke
> rnel.org%2Fdoc%2Fhtml%2Flatest%2Fprocess%2Fdeprecated.html%23zero-len
> gth-and-one-element-arrays&data=05%7C01%7Cming.qian%40nxp.com%
> 7C8f4e000999114f77682908da40280bd5%7C686ea1d3bc2b4c6fa92cd99c5c
> 301635%7C0%7C0%7C637892837984973240%7CUnknown%7CTWFpbGZsb3
> d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%
> 3D%7C3000%7C%7C%7C&sdata=xKvM4qigtFIfvBzNDka44uqTUfloTnNmC
> xPVAhlk5tc%3D&reserved=0
> [3]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.
> com%2FKSPP%2Flinux%2Fissues%2F78&data=05%7C01%7Cming.qian%4
> 0nxp.com%7C8f4e000999114f77682908da40280bd5%7C686ea1d3bc2b4c6fa
> 92cd99c5c301635%7C0%7C0%7C637892837984973240%7CUnknown%7CT
> WFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJ
> XVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=uzEzW1AEtyWGsmJCHJ%2F
> DfMqa4lCsJjmVfz7KRugzOho%3D&reserved=0
>
> Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
> Cc: Ming Qian <ming.qian@nxp.com>
> Cc: Shijie Qin <shijie.qin@nxp.com>
> Cc: Zhou Peng <eagle.zhou@nxp.com>
> Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
> Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
> Cc: linux-media@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: ming_qian <ming.qian@nxp.com>
> ---
> drivers/media/platform/amphion/vpu_dbg.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/amphion/vpu_dbg.c
> b/drivers/media/platform/amphion/vpu_dbg.c
> index da62bd718fb8..f72c8a506b22 100644
> --- a/drivers/media/platform/amphion/vpu_dbg.c
> +++ b/drivers/media/platform/amphion/vpu_dbg.c
> @@ -27,7 +27,7 @@ struct print_buf_desc {
> u32 bytes;
> u32 read;
> u32 write;
> - char buffer[0];
> + char buffer[];
> };
>
> static char *vb2_stat_name[] = {
> --
> 2.32.0
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] media: amphion: Replace zero-length array with flexible-array member
2022-05-27 21:29 [PATCH] media: amphion: Replace zero-length array with flexible-array member Kees Cook
2022-05-27 22:08 ` Gustavo A. R. Silva
2022-05-30 5:15 ` [EXT] " Ming Qian
@ 2022-05-30 11:27 ` Tommaso Merciai
2 siblings, 0 replies; 4+ messages in thread
From: Tommaso Merciai @ 2022-05-30 11:27 UTC (permalink / raw)
To: Kees Cook
Cc: Ming Qian, Shijie Qin, Zhou Peng, Mauro Carvalho Chehab,
Gustavo A . R . Silva, linux-media, Hans Verkuil,
Nicolas Dufresne, linux-kernel, linux-hardening
On Fri, May 27, 2022 at 02:29:53PM -0700, Kees Cook wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should no
> longer be used[2][3].
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> [3] https://github.com/KSPP/linux/issues/78
>
> Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
> Cc: Ming Qian <ming.qian@nxp.com>
> Cc: Shijie Qin <shijie.qin@nxp.com>
> Cc: Zhou Peng <eagle.zhou@nxp.com>
> Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
> Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
> Cc: linux-media@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> drivers/media/platform/amphion/vpu_dbg.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
> index da62bd718fb8..f72c8a506b22 100644
> --- a/drivers/media/platform/amphion/vpu_dbg.c
> +++ b/drivers/media/platform/amphion/vpu_dbg.c
> @@ -27,7 +27,7 @@ struct print_buf_desc {
> u32 bytes;
> u32 read;
> u32 write;
> - char buffer[0];
> + char buffer[];
> };
>
> static char *vb2_stat_name[] = {
> --
> 2.32.0
>
Hi,
Looks good to me, thanks.
Reviewed-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
--
Tommaso Merciai
Embedded Linux Engineer
tommaso.merciai@amarulasolutions.com
__________________________________
Amarula Solutions SRL
Via Le Canevare 30, 31100 Treviso, Veneto, IT
T. +39 042 243 5310
info@amarulasolutions.com
www.amarulasolutions.com
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-05-27 21:29 [PATCH] media: amphion: Replace zero-length array with flexible-array member Kees Cook
2022-05-27 22:08 ` Gustavo A. R. Silva
2022-05-30 5:15 ` [EXT] " Ming Qian
2022-05-30 11:27 ` Tommaso Merciai
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