netdev - Re: [PATCH net-next v2 3/3] tools: ynl-gen: support struct for binary attributes

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Message-ID: <m2ldr5h4xu.fsf@gmail.com>
Date: Fri, 09 May 2025 22:03:57 +0100
From: Donald Hunter <donald.hunter@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net,  netdev@...r.kernel.org,  edumazet@...gle.com,
  pabeni@...hat.com,  andrew+netdev@...n.ch,  horms@...nel.org,
  jacob.e.keller@...el.com
Subject: Re: [PATCH net-next v2 3/3] tools: ynl-gen: support struct for
 binary attributes

Jakub Kicinski <kuba@...nel.org> writes:

> Support using a struct pointer for binary attrs. Len field is maintained
> because the structs may grow with newer kernel versions. Or, which matters
> more, be shorter if the binary is built against newer uAPI than kernel
> against which it's executed. Since we are storing a pointer to a struct
> type - always allocate at least the amount of memory needed by the struct
> per current uAPI headers (unused mem is zeroed). Technically users should
> check the length field but per modern ASAN checks storing a short object
> under a pointer seems like a bad idea.
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Reviewed-by: Donald Hunter <donald.hunter@...il.com>