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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4778bcf75b8sm27665445e9.1.2025.11.13.11.22.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Nov 2025 11:22:22 -0800 (PST) Date: Thu, 13 Nov 2025 19:22:18 +0000 From: David Laight To: Shi Hao Cc: pavan.chebbi@broadcom.com, mchan@broadcom.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] net: ethernet: broadcom: replace strcpy with strscpy Message-ID: <20251113192218.3c17dabc@pumpkin> In-Reply-To: <20251113082517.49007-1-i.shihao.999@gmail.com> References: <20251113082517.49007-1-i.shihao.999@gmail.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 13 Nov 2025 13:55:17 +0530 Shi Hao wrote: > Replace strcpy function calls with strscpy to ensure bounds checking > in the destination buffer, preventing buffer overflows and improving > security. This change aligns with current kernel coding guidelines > and best practices. > ... > - strcpy(tp->board_part_number, "BCM5717"); > + strscpy(tp->board_part_number, "BCM5717", TG3_BPN_SIZE); No one really knows that TG3_BPN_SIZE is in any way related to the destination. So this doesn't actually make the code that much better at all. Since tp->board_part_number is an array and "BCM5717" a constant I suspect there is already a compile-time check that the string fits. The strcpy() will also be converted to a memcpy(). So all, in all, this makes the code worse on several fronts. David