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[79.242.62.232]) by smtp.gmail.com with ESMTPSA id d6sm2404299wrx.60.2021.11.11.01.59.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 11 Nov 2021 01:59:51 -0800 (PST) Message-ID: <864f67e1-6250-57ac-511b-60a3590af2c2@redhat.com> Date: Thu, 11 Nov 2021 10:59:50 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: [PATCH 2/7] fs/exec: make __get_task_comm always get a nul terminated string Content-Language: en-US To: Yafang Shao , akpm@linux-foundation.org Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, oliver.sang@intel.com, lkp@intel.com, Kees Cook , Steven Rostedt , Mathieu Desnoyers , Arnaldo Carvalho de Melo , Alexei Starovoitov , Andrii Nakryiko , Michal Miroslaw , Peter Zijlstra , Matthew Wilcox , Al Viro , Petr Mladek References: <20211108083840.4627-1-laoar.shao@gmail.com> <20211108083840.4627-3-laoar.shao@gmail.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20211108083840.4627-3-laoar.shao@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 08.11.21 09:38, Yafang Shao wrote: > If the dest buffer size is smaller than sizeof(tsk->comm), the buffer > will be without null ternimator, that may cause problem. Using > strscpy_pad() instead of strncpy() in __get_task_comm() can make the string > always nul ternimated. > > Suggested-by: Kees Cook > Suggested-by: Steven Rostedt > Signed-off-by: Yafang Shao > Reviewed-by: Kees Cook > Cc: Mathieu Desnoyers > Cc: Arnaldo Carvalho de Melo > Cc: Alexei Starovoitov > Cc: Andrii Nakryiko > Cc: Michal Miroslaw > Cc: Peter Zijlstra > Cc: Steven Rostedt > Cc: Matthew Wilcox > Cc: David Hildenbrand > Cc: Al Viro > Cc: Kees Cook > Cc: Petr Mladek > --- Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb