linux-kernel - [PATCH 1/6] scsi: message: fusion: struct _RAID_VOL0_SETTINGS: Replace 1-element array with flexible array

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Message-Id: <20240711172821.123936-1-kees@kernel.org>
Date: Thu, 11 Jul 2024 10:28:15 -0700
From: Kees Cook <kees@...nel.org>
To: Sathya Prakash <sathya.prakash@...adcom.com>
Cc: Kees Cook <kees@...nel.org>,
	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: [PATCH 1/6] scsi: message: fusion: struct _RAID_VOL0_SETTINGS: Replace 1-element array with flexible array

Replace the deprecated[1] use of a 1-element array in
struct _RAID_VOL0_SETTINGS with a modern flexible array.

Additionally add __counted_by annotation since PhysDisk is only ever
accessed via a loops bounded by NumPhysDisks:

lsi/mpi_cnfg.h:    RAID_VOL0_PHYS_DISK     PhysDisk[] __counted_by(NumPhysDisks); /* 28h */
mptbase.c:	for (i = 0; i < buffer->NumPhysDisks; i++) {
mptbase.c:		    buffer->PhysDisk[i].PhysDiskNum, &phys_disk) != 0)
mptsas.c:	for (i = 0; i < buffer->NumPhysDisks; i++) {
mptsas.c:		    buffer->PhysDisk[i].PhysDiskNum, &phys_disk) != 0)
mptsas.c:	for (i = 0; i < buffer->NumPhysDisks; i++) {
mptsas.c:		    buffer->PhysDisk[i].PhysDiskNum, &phys_disk) != 0)

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>
---
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 3770cb1cff7d..f59a741ef21c 100644
--- a/drivers/message/fusion/lsi/mpi_cnfg.h
+++ b/drivers/message/fusion/lsi/mpi_cnfg.h
@@ -2295,14 +2295,6 @@ typedef struct _RAID_VOL0_SETTINGS
 #define MPI_RAID_HOT_SPARE_POOL_6                       (0x40)
 #define MPI_RAID_HOT_SPARE_POOL_7                       (0x80)
 
-/*
- * Host code (drivers, BIOS, utilities, etc.) should leave this define set to
- * one and check Header.PageLength at runtime.
- */
-#ifndef MPI_RAID_VOL_PAGE_0_PHYSDISK_MAX
-#define MPI_RAID_VOL_PAGE_0_PHYSDISK_MAX        (1)
-#endif
-
 typedef struct _CONFIG_PAGE_RAID_VOL_0
 {
     CONFIG_PAGE_HEADER      Header;         /* 00h */
@@ -2321,7 +2313,7 @@ typedef struct _CONFIG_PAGE_RAID_VOL_0
     U8                      DataScrubRate;  /* 25h */
     U8                      ResyncRate;     /* 26h */
     U8                      InactiveStatus; /* 27h */
-    RAID_VOL0_PHYS_DISK     PhysDisk[MPI_RAID_VOL_PAGE_0_PHYSDISK_MAX];/* 28h */
+    RAID_VOL0_PHYS_DISK     PhysDisk[] __counted_by(NumPhysDisks); /* 28h */
 } CONFIG_PAGE_RAID_VOL_0, MPI_POINTER PTR_CONFIG_PAGE_RAID_VOL_0,
   RaidVolumePage0_t, MPI_POINTER pRaidVolumePage0_t;
 
-- 
2.34.1