Subject: Re: [PATCH 1/3] ipw2x00: Avoid field-overflowing memcpy()

From: Kalle Valo <[email-masked]>
Date: Sat, 21 Aug 2021 17:15:54 +0000 (UTC)

Kees Cook <[email-masked]> wrote:

> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memcpy(), memmove(), and memset(), avoid
> intentionally writing across neighboring fields.
> 
> libipw_read_qos_param_element() copies a struct libipw_info_element
> into a struct libipw_qos_information_element, but is actually wanting to
> copy into the larger struct libipw_qos_parameter_info (the contents of
> ac_params_record[] is later examined). Refactor the routine to perform
> centralized checks, and copy the entire contents directly (since the id
> and len members match the elementID and length members):
> 
> struct libipw_info_element {
>         u8 id;
>         u8 len;
>         u8 data[];
> } __packed;
> 
> struct libipw_qos_information_element {
>         u8 elementID;
>         u8 length;
>         u8 qui[QOS_OUI_LEN];
>         u8 qui_type;
>         u8 qui_subtype;
>         u8 version;
>         u8 ac_info;
> } __packed;
> 
> struct libipw_qos_parameter_info {
>         struct libipw_qos_information_element info_element;
>         u8 reserved;
>         struct libipw_qos_ac_parameter ac_params_record[QOS_QUEUE_NUM];
> } __packed;
> 
> Cc: Stanislav Yakovlev <[email-masked]>
> Cc: Kalle Valo <[email-masked]>
> Cc: "David S. Miller" <[email-masked]>
> Cc: Jakub Kicinski <[email-masked]>
> Cc: [email-masked]
> Cc: [email-masked]
> Signed-off-by: Kees Cook <[email-masked]>

2 patches applied to wireless-drivers-next.git, thanks.

d6b6d1bb80be ipw2x00: Avoid field-overflowing memcpy()
92276c592a6b ray_cs: Split memcpy() to avoid bounds check warning

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