linux-hardening - [PATCH] scsi: aic79xx: Use __ro_after

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Message-Id: <20220914115953.3854029-1-keescook@chromium.org>
Date:   Wed, 14 Sep 2022 04:59:53 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Hannes Reinecke <hare@...e.com>
Cc:     Kees Cook <keescook@...omium.org>,
        David Malcolm <dmalcolm@...hat.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: [PATCH] scsi: aic79xx: Use __ro_after_init explicitly

ahd_linux_setup_iocell_info() intentionally writes to the const-marked
aic79xx_iocell_info array, but is called during __init, so the location
is actually writable at this point on most architectures. Annotate this
explicitly with __ro_after_init to avoid static analysis confusion.

Reported-by: David Malcolm <dmalcolm@...hat.com>
Link: https://lpc.events/event/16/contributions/1175/attachments/1109/2128/2022-LPC-analyzer-talk.pdf
Cc: Hannes Reinecke <hare@...e.com>
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/scsi/aic7xxx/aic79xx_osm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 928099163f0f..f2f3405cdec5 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -194,7 +194,7 @@ struct ahd_linux_iocell_opts
 #define AIC79XX_PRECOMP_INDEX	0
 #define AIC79XX_SLEWRATE_INDEX	1
 #define AIC79XX_AMPLITUDE_INDEX	2
-static const struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
+static struct ahd_linux_iocell_opts aic79xx_iocell_info[] __ro_after_init =
 {
 	AIC79XX_DEFAULT_IOOPTS,
 	AIC79XX_DEFAULT_IOOPTS,
-- 
2.34.1