2023-10-03 23:19:09

by Kees Cook

Subject: [PATCH] nfp: Annotate struct nfp_reprs with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct nfp_reprs.

Cc: Simon Horman <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <[email protected]>
---
drivers/net/ethernet/netronome/nfp/nfp_net_repr.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
index 48a74accbbd3..77bf4198dbde 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
@@ -18,7 +18,7 @@ struct nfp_port;
*/
struct nfp_reprs {
unsigned int num_reprs;
- struct net_device __rcu *reprs[];
+ struct net_device __rcu *reprs[] __counted_by(num_reprs);
};

/**
--
2.34.1

2023-10-04 01:46:19

by Gustavo A. R. Silva

Subject: Re: [PATCH] nfp: Annotate struct nfp_reprs with __counted_by

On 10/4/23 01:18, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct nfp_reprs.
>
> Cc: Simon Horman <[email protected]>
> Cc: Jakub Kicinski <[email protected]>
> Cc: "David S. Miller" <[email protected]>
> Cc: Eric Dumazet <[email protected]>
> Cc: Paolo Abeni <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <[email protected]>

Reviewed-by: Gustavo A. R. Silva <[email protected]>

Thanks
--
Gustavo

> ---
> drivers/net/ethernet/netronome/nfp/nfp_net_repr.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> index 48a74accbbd3..77bf4198dbde 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> @@ -18,7 +18,7 @@ struct nfp_port;
> */
> struct nfp_reprs {
> unsigned int num_reprs;
> - struct net_device __rcu *reprs[];
> + struct net_device __rcu *reprs[] __counted_by(num_reprs);
> };
>
> /**

2023-10-04 05:13:30

by Louis Peens

Subject: Re: [PATCH] nfp: Annotate struct nfp_reprs with __counted_by

On Tue, Oct 03, 2023 at 04:18:43PM -0700, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct nfp_reprs.
>
> Cc: Simon Horman <[email protected]>
> Cc: Jakub Kicinski <[email protected]>
> Cc: "David S. Miller" <[email protected]>
> Cc: Eric Dumazet <[email protected]>
> Cc: Paolo Abeni <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <[email protected]>
Thanks Kees

Acked-by: Louis Peens <[email protected]>
> ---
> drivers/net/ethernet/netronome/nfp/nfp_net_repr.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> index 48a74accbbd3..77bf4198dbde 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> @@ -18,7 +18,7 @@ struct nfp_port;
> */
> struct nfp_reprs {
> unsigned int num_reprs;
> - struct net_device __rcu *reprs[];
> + struct net_device __rcu *reprs[] __counted_by(num_reprs);
> };
>
> /**
> --
> 2.34.1
>

2023-10-06 01:40:49

by patchwork-bot+netdevbpf

Subject: Re: [PATCH] nfp: Annotate struct nfp_reprs with __counted_by

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <[email protected]>:

On Tue, 3 Oct 2023 16:18:43 -0700 you wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct nfp_reprs.
>
> [...]

Here is the summary with links:
- nfp: Annotate struct nfp_reprs with __counted_by
https://git.kernel.org/netdev/net-next/c/4514aa9f56fd

You are awesome, thank you!
--
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