linux-hardening - Re: [PATCH 05/10][next] scsi: aacraid: Replace one-element array with flexible-array member in struct sgmapraw

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Date:   Wed, 28 Jun 2023 13:49:45 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     aacraid@...rosemi.com, "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 05/10][next] scsi: aacraid: Replace one-element array
 with flexible-array member in struct sgmapraw

On Wed, Jun 28, 2023 at 11:56:12AM -0600, Gustavo A. R. Silva wrote:
> Replace one-element array with flexible-array member in struct
> sgmapraw.
> 
> Issue found with the help of Coccinelle and audited and fixed,
> manually.

As with the other two, I see expected binary changes in
aac_read_raw_io() and aac_write_raw_io() due to the simplified count
calculations.

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> 
> Link: https://github.com/KSPP/linux/issues/79
> Link: https://github.com/ClangBuiltLinux/linux/issues/1851
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  drivers/scsi/aacraid/aachba.c  | 4 ++--
>  drivers/scsi/aacraid/aacraid.h | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
> index fff0550e02e4..b3c0c2255e55 100644
> --- a/drivers/scsi/aacraid/aachba.c
> +++ b/drivers/scsi/aacraid/aachba.c
> @@ -1267,7 +1267,7 @@ static int aac_read_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
>  			return ret;
>  		command = ContainerRawIo;
>  		fibsize = sizeof(struct aac_raw_io) +
> -			((le32_to_cpu(readcmd->sg.count)-1) * sizeof(struct sgentryraw));
> +			  le32_to_cpu(readcmd->sg.count) * sizeof(struct sgentryraw);
>  	}
>  
>  	BUG_ON(fibsize > (fib->dev->max_fib_size - sizeof(struct aac_fibhdr)));
> @@ -1401,7 +1401,7 @@ static int aac_write_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
>  			return ret;
>  		command = ContainerRawIo;
>  		fibsize = sizeof(struct aac_raw_io) +
> -			((le32_to_cpu(writecmd->sg.count)-1) * sizeof (struct sgentryraw));
> +			  le32_to_cpu(writecmd->sg.count) * sizeof(struct sgentryraw);
>  	}
>  
>  	BUG_ON(fibsize > (fib->dev->max_fib_size - sizeof(struct aac_fibhdr)));
> diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
> index d1fc1ce2e36d..87015dd2abd9 100644
> --- a/drivers/scsi/aacraid/aacraid.h
> +++ b/drivers/scsi/aacraid/aacraid.h
> @@ -527,7 +527,7 @@ struct user_sgmap64 {
>  
>  struct sgmapraw {
>  	__le32		  count;
> -	struct sgentryraw sg[1];
> +	struct sgentryraw sg[];
>  };
>  
>  struct user_sgmapraw {
> -- 
> 2.34.1
> 

-- 
Kees Cook