Re: [PATCH 6/6] scsi: message: fusion: struct _CONFIG_PAGE_IOC_4: Replace 1-element array with flexible array

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

On 11/07/24 11:28, Kees Cook wrote:
> Replace the deprecated[1] use of a 1-element array in
> struct _CONFIG_PAGE_IOC_4 with a modern flexible array.
> 
> Additionally add __counted_by annotation since SEP is only ever accessed
> after updating ACtiveSEP:
> 
> lsi/mpi_cnfg.h:    IOC_4_SEP                   SEP[] __counted_by(ActiveSEP);  /* 08h */
> mptsas.c:        ii = IOCPage4Ptr->ActiveSEP++;
> mptsas.c:        IOCPage4Ptr->SEP[ii].SEPTargetID = id;
> mptsas.c:        IOCPage4Ptr->SEP[ii].SEPBus = channel;
> 
> No binary differences are present after this conversion.
> 
> Link: https://github.com/KSPP/linux/issues/79 [1]
> Signed-off-by: Kees Cook <kees@kernel.org>

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

Thanks!
-- 
Gustavo

> ---
> Cc: Sathya Prakash <sathya.prakash@broadcom.com>
> Cc: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
> Cc: Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
> Cc: MPT-FusionLinux.pdl@broadcom.com
> Cc: linux-scsi@vger.kernel.org
> Cc: linux-hardening@vger.kernel.org
> ---
>   drivers/message/fusion/lsi/mpi_cnfg.h | 10 +---------
>   1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/drivers/message/fusion/lsi/mpi_cnfg.h b/drivers/message/fusion/lsi/mpi_cnfg.h
> index bac49c162165..1167a16d8fb4 100644
> --- a/drivers/message/fusion/lsi/mpi_cnfg.h
> +++ b/drivers/message/fusion/lsi/mpi_cnfg.h
> @@ -1077,21 +1077,13 @@ typedef struct _IOC_4_SEP
>   } IOC_4_SEP, MPI_POINTER PTR_IOC_4_SEP,
>     Ioc4Sep_t, MPI_POINTER pIoc4Sep_t;
>   
> -/*
> - * Host code (drivers, BIOS, utilities, etc.) should leave this define set to
> - * one and check Header.PageLength at runtime.
> - */
> -#ifndef MPI_IOC_PAGE_4_SEP_MAX
> -#define MPI_IOC_PAGE_4_SEP_MAX              (1)
> -#endif
> -
>   typedef struct _CONFIG_PAGE_IOC_4
>   {
>       CONFIG_PAGE_HEADER          Header;                         /* 00h */
>       U8                          ActiveSEP;                      /* 04h */
>       U8                          MaxSEP;                         /* 05h */
>       U16                         Reserved1;                      /* 06h */
> -    IOC_4_SEP                   SEP[MPI_IOC_PAGE_4_SEP_MAX];    /* 08h */
> +    IOC_4_SEP                   SEP[] __counted_by(ActiveSEP);  /* 08h */
>   } CONFIG_PAGE_IOC_4, MPI_POINTER PTR_CONFIG_PAGE_IOC_4,
>     IOCPage4_t, MPI_POINTER pIOCPage4_t;
>