linux-hardening - [PATCH] scsi: message: fusion: Replace all non-returning strlcpy with strscpy

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Date:   Tue, 30 May 2023 16:02:48 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Sathya Prakash <sathya.prakash@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: message: fusion: Replace all non-returning strlcpy with strscpy

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
---
 drivers/message/fusion/mptbase.c |    4 ++--
 drivers/message/fusion/mptctl.c  |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 4f0afce8428d..4bf669c55649 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -712,7 +712,7 @@ mpt_register(MPT_CALLBACK cbfunc, MPT_DRIVER_CLASS dclass, char *func_name)
 			MptDriverClass[cb_idx] = dclass;
 			MptEvHandlers[cb_idx] = NULL;
 			last_drv_idx = cb_idx;
-			strlcpy(MptCallbacksName[cb_idx], func_name,
+			strscpy(MptCallbacksName[cb_idx], func_name,
 				MPT_MAX_CALLBACKNAME_LEN+1);
 			break;
 		}
@@ -7666,7 +7666,7 @@ mpt_display_event_info(MPT_ADAPTER *ioc, EventNotificationReply_t *pEventReply)
 		break;
 	}
 	if (ds)
-		strlcpy(evStr, ds, EVENT_DESCR_STR_SZ);
+		strscpy(evStr, ds, EVENT_DESCR_STR_SZ);
 
 
 	devtprintk(ioc, printk(MYIOC_s_DEBUG_FMT
diff --git a/drivers/message/fusion/mptctl.c b/drivers/message/fusion/mptctl.c
index 1decd09a08d8..dd028df4b283 100644
--- a/drivers/message/fusion/mptctl.c
+++ b/drivers/message/fusion/mptctl.c
@@ -2408,7 +2408,7 @@ mptctl_hp_hostinfo(MPT_ADAPTER *ioc, unsigned long arg, unsigned int data_size)
 				if (mpt_config(ioc, &cfg) == 0) {
 					ManufacturingPage0_t *pdata = (ManufacturingPage0_t *) pbuf;
 					if (strlen(pdata->BoardTracerNumber) > 1) {
-						strlcpy(karg.serial_number,
+						strscpy(karg.serial_number,
 							pdata->BoardTracerNumber, 24);
 					}
 				}