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[35.188.70.54]) by smtp.gmail.com with ESMTPSA id h2-20020a02c4c2000000b00411bdcdc488sm6276548jaj.173.2023.07.03.11.13.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Jul 2023 11:13:08 -0700 (PDT) From: Azeem Shaikh To: Felix Fietkau , Lorenzo Bianconi , Ryder Lee Cc: linux-hardening@vger.kernel.org, Azeem Shaikh , Shayne Chen , Sean Wang , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Kalle Valo , Matthias Brugger , AngeloGioacchino Del Regno , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH] wifi: mt76: Replace strlcpy with strscpy Date: Mon, 3 Jul 2023 18:12:56 +0000 Message-ID: <20230703181256.3712079-1-azeemshaikh38@gmail.com> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org 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(). Direct replacement is safe here since DEV_ASSIGN is only used by TRACE macros and the return values are ignored. [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 --- drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h | 2 +- drivers/net/wireless/mediatek/mt76/mt76x02_trace.h | 2 +- drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h | 2 +- drivers/net/wireless/mediatek/mt76/trace.h | 2 +- drivers/net/wireless/mediatek/mt76/usb_trace.h | 2 +- 5 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h index d3eb49d83b98..9be5a58a4e6d 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h @@ -14,7 +14,7 @@ #define MAXNAME 32 #define DEV_ENTRY __array(char, wiphy_name, 32) -#define DEV_ASSIGN strlcpy(__entry->wiphy_name, \ +#define DEV_ASSIGN strscpy(__entry->wiphy_name, \ wiphy_name(mt76_hw(dev)->wiphy), MAXNAME) #define DEV_PR_FMT "%s" #define DEV_PR_ARG __entry->wiphy_name diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_trace.h b/drivers/net/wireless/mediatek/mt76/mt76x02_trace.h index 6a98092e996b..11d119cd0f6f 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x02_trace.h +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_trace.h @@ -14,7 +14,7 @@ #define MAXNAME 32 #define DEV_ENTRY __array(char, wiphy_name, 32) -#define DEV_ASSIGN strlcpy(__entry->wiphy_name, \ +#define DEV_ASSIGN strscpy(__entry->wiphy_name, \ wiphy_name(mt76_hw(dev)->wiphy), MAXNAME) #define DEV_PR_FMT "%s" #define DEV_PR_ARG __entry->wiphy_name diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h index 9bc4db67f352..887d5cfddd01 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h @@ -14,7 +14,7 @@ #define MAXNAME 32 #define DEV_ENTRY __array(char, wiphy_name, 32) -#define DEV_ASSIGN strlcpy(__entry->wiphy_name, \ +#define DEV_ASSIGN strscpy(__entry->wiphy_name, \ wiphy_name(mt76_hw(dev)->wiphy), MAXNAME) #define DEV_PR_FMT "%s" #define DEV_PR_ARG __entry->wiphy_name diff --git a/drivers/net/wireless/mediatek/mt76/trace.h b/drivers/net/wireless/mediatek/mt76/trace.h index c3d0ef8e2890..109a07f9733a 100644 --- a/drivers/net/wireless/mediatek/mt76/trace.h +++ b/drivers/net/wireless/mediatek/mt76/trace.h @@ -14,7 +14,7 @@ #define MAXNAME 32 #define DEV_ENTRY __array(char, wiphy_name, 32) -#define DEVICE_ASSIGN strlcpy(__entry->wiphy_name, \ +#define DEVICE_ASSIGN strscpy(__entry->wiphy_name, \ wiphy_name(dev->hw->wiphy), MAXNAME) #define DEV_PR_FMT "%s" #define DEV_PR_ARG __entry->wiphy_name diff --git a/drivers/net/wireless/mediatek/mt76/usb_trace.h b/drivers/net/wireless/mediatek/mt76/usb_trace.h index f5ab3215af80..7b261ddb2ac6 100644 --- a/drivers/net/wireless/mediatek/mt76/usb_trace.h +++ b/drivers/net/wireless/mediatek/mt76/usb_trace.h @@ -14,7 +14,7 @@ #define MAXNAME 32 #define DEV_ENTRY __array(char, wiphy_name, 32) -#define DEV_ASSIGN strlcpy(__entry->wiphy_name, \ +#define DEV_ASSIGN strscpy(__entry->wiphy_name, \ wiphy_name(dev->hw->wiphy), MAXNAME) #define DEV_PR_FMT "%s " #define DEV_PR_ARG __entry->wiphy_name -- 2.41.0.255.g8b1d071c50-goog