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[35.188.70.54]) by smtp.gmail.com with ESMTPSA id ed22-20020a056638291600b0042b3e2e5ca1sm1033860jab.122.2023.07.03.10.22.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Jul 2023 10:22:42 -0700 (PDT) From: Azeem Shaikh To: Kees Cook , Jens Axboe Cc: linux-hardening@vger.kernel.org, Azeem Shaikh , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Steven Rostedt Subject: [PATCH 2/2] blk-wbt: Replace strlcpy with strscpy Date: Mon, 3 Jul 2023 17:21:59 +0000 Message-ID: <20230703172159.3668349-3-azeemshaikh38@gmail.com> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog In-Reply-To: <20230703172159.3668349-1-azeemshaikh38@gmail.com> References: <20230703172159.3668349-1-azeemshaikh38@gmail.com> MIME-Version: 1.0 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(). 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 --- include/trace/events/wbt.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/include/trace/events/wbt.h b/include/trace/events/wbt.h index 9c66e59d859c..4661f0d27062 100644 --- a/include/trace/events/wbt.h +++ b/include/trace/events/wbt.h @@ -33,7 +33,7 @@ TRACE_EVENT(wbt_stat, ), TP_fast_assign( - strlcpy(__entry->name, bdi_dev_name(bdi), + strscpy(__entry->name, bdi_dev_name(bdi), ARRAY_SIZE(__entry->name)); __entry->rmean = stat[0].mean; __entry->rmin = stat[0].min; @@ -68,7 +68,7 @@ TRACE_EVENT(wbt_lat, ), TP_fast_assign( - strlcpy(__entry->name, bdi_dev_name(bdi), + strscpy(__entry->name, bdi_dev_name(bdi), ARRAY_SIZE(__entry->name)); __entry->lat = div_u64(lat, 1000); ), @@ -105,7 +105,7 @@ TRACE_EVENT(wbt_step, ), TP_fast_assign( - strlcpy(__entry->name, bdi_dev_name(bdi), + strscpy(__entry->name, bdi_dev_name(bdi), ARRAY_SIZE(__entry->name)); __entry->msg = msg; __entry->step = step; @@ -141,7 +141,7 @@ TRACE_EVENT(wbt_timer, ), TP_fast_assign( - strlcpy(__entry->name, bdi_dev_name(bdi), + strscpy(__entry->name, bdi_dev_name(bdi), ARRAY_SIZE(__entry->name)); __entry->status = status; __entry->step = step;