linux-kernel - Re: [PATCH 4/6] scsi: message: fusion: struct _CONFIG_PAGE_IOC_2: Replace 1-element array with flexible array

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Message-ID: <359fbd37-67a6-4a1b-81b9-f551c5205a54@embeddedor.com>
Date: Thu, 11 Jul 2024 12:17:19 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <kees@...nel.org>, Sathya Prakash <sathya.prakash@...adcom.com>
Cc: Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
 Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
 linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] scsi: message: fusion: struct _CONFIG_PAGE_IOC_2:
 Replace 1-element array with flexible array



On 11/07/24 11:28, Kees Cook wrote:
> Replace the deprecated[1] use of a 1-element array in
> struct _CONFIG_PAGE_IOC_2 with a modern flexible array.
> 
> Additionally add __counted_by annotation since RaidVolume is only ever
> accessed from loops controlled by NumActiveVolumes:
> 
> lsi/mpi_cnfg.h:    CONFIG_PAGE_IOC_2_RAID_VOL  RaidVolume[] __counted_by(NumActiveVolumes); /* 0Ch */
> mptbase.c:      for (i = 0; i < pIoc2->NumActiveVolumes ; i++)
> mptbase.c:                  pIoc2->RaidVolume[i].VolumeBus,
> mptbase.c:                  pIoc2->RaidVolume[i].VolumeID);
> mptsas.c:               for (i = 0; i < ioc->raid_data.pIocPg2->NumActiveVolumes; i++) {
> mptsas.c:                                       RaidVolume[i].VolumeID) {
> mptsas.c:                                       RaidVolume[i].VolumeBus;
> mptsas.c:       for (i = 0; i < ioc->raid_data.pIocPg2->NumActiveVolumes; i++) {
> mptsas.c:                   ioc->raid_data.pIocPg2->RaidVolume[i].VolumeID, 0);
> mptsas.c:                   ioc->raid_data.pIocPg2->RaidVolume[i].VolumeID);
> mptsas.c:                   ioc->raid_data.pIocPg2->RaidVolume[i].VolumeID, 0);
> mptsas.c:               for (i = 0; i < ioc->raid_data.pIocPg2->NumActiveVolumes; i++) {
> mptsas.c:                       if (ioc->raid_data.pIocPg2->RaidVolume[i].VolumeID ==
> mptsas.c:       for (i = 0; i < ioc->raid_data.pIocPg2->NumActiveVolumes; i++)
> mptsas.c:               if (ioc->raid_data.pIocPg2->RaidVolume[i].VolumeID == id)
> mptspi.c:       for (i=0; i < ioc->raid_data.pIocPg2->NumActiveVolumes; i++) {
> mptspi.c:               if (ioc->raid_data.pIocPg2->RaidVolume[i].VolumeID == id) {
> 
> No binary differences are present after this conversion.
> 
> Link: https://github.com/KSPP/linux/issues/79 [1]
> Signed-off-by: Kees Cook <kees@...nel.org>

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

Thanks
-- 
Gustavo

> ---
> Cc: Sathya Prakash <sathya.prakash@...adcom.com>
> Cc: Sreekanth Reddy <sreekanth.reddy@...adcom.com>
> Cc: Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: MPT-FusionLinux.pdl@...adcom.com
> Cc: linux-scsi@...r.kernel.org
> Cc: linux-hardening@...r.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 e30132b57ae7..7713c74e515b 100644
> --- a/drivers/message/fusion/lsi/mpi_cnfg.h
> +++ b/drivers/message/fusion/lsi/mpi_cnfg.h
> @@ -1018,14 +1018,6 @@ typedef struct _CONFIG_PAGE_IOC_2_RAID_VOL
>   
>   #define MPI_IOCPAGE2_FLAG_VOLUME_INACTIVE           (0x08)
>   
> -/*
> - * Host code (drivers, BIOS, utilities, etc.) should leave this define set to
> - * one and check Header.PageLength at runtime.
> - */
> -#ifndef MPI_IOC_PAGE_2_RAID_VOLUME_MAX
> -#define MPI_IOC_PAGE_2_RAID_VOLUME_MAX      (1)
> -#endif
> -
>   typedef struct _CONFIG_PAGE_IOC_2
>   {
>       CONFIG_PAGE_HEADER          Header;                              /* 00h */
> @@ -1034,7 +1026,7 @@ typedef struct _CONFIG_PAGE_IOC_2
>       U8                          MaxVolumes;                          /* 09h */
>       U8                          NumActivePhysDisks;                  /* 0Ah */
>       U8                          MaxPhysDisks;                        /* 0Bh */
> -    CONFIG_PAGE_IOC_2_RAID_VOL  RaidVolume[MPI_IOC_PAGE_2_RAID_VOLUME_MAX];/* 0Ch */
> +    CONFIG_PAGE_IOC_2_RAID_VOL  RaidVolume[] __counted_by(NumActiveVolumes); /* 0Ch */
>   } CONFIG_PAGE_IOC_2, MPI_POINTER PTR_CONFIG_PAGE_IOC_2,
>     IOCPage2_t, MPI_POINTER pIOCPage2_t;
>