linux-hardening - Re: [PATCH] serial: 8250_pci1xxxx: Annotate struct pci1xxxx_8250 with __counted

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Message-ID: <efef6075-41ca-5c12-2593-54da4d2c7f22@embeddedor.com>
Date: Sat, 23 Sep 2023 10:36:10 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>
Cc: Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] serial: 8250_pci1xxxx: Annotate struct pci1xxxx_8250 with
 __counted_by

On 9/22/23 11:52, 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 checking 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 pci1xxxx_8250.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>
> Cc: Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jiri Slaby <jirislaby@...nel.org>
> Cc: linux-serial@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
>   drivers/tty/serial/8250/8250_pci1xxxx.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c
> index a3b25779d921..0da9847f3e91 100644
> --- a/drivers/tty/serial/8250/8250_pci1xxxx.c
> +++ b/drivers/tty/serial/8250/8250_pci1xxxx.c
> @@ -107,7 +107,7 @@ static const int logical_to_physical_port_idx[][MAX_PORTS] = {
>   struct pci1xxxx_8250 {
>   	unsigned int nr;
>   	void __iomem *membase;
> -	int line[];
> +	int line[] __counted_by(nr);
>   };
>   
>   static int pci1xxxx_get_num_ports(struct pci_dev *dev)