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Mon, 20 Apr 2026 07:17:46 -0700 (PDT) Received: from localhost ([2a01:4b00:d036:ae00:355d:3be4:308b:c943]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-488fc1c0354sm269742375e9.11.2026.04.20.07.17.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Apr 2026 07:17:45 -0700 (PDT) From: luca.boccassi@gmail.com To: kexec@lists.infradead.org Cc: linux-mm@kvack.org, graf@amazon.com, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, brauner@kernel.org, linux-kernel@vger.kernel.org, Luca Boccassi Subject: [PATCH v9 1/6] liveupdate: reject LIVEUPDATE_IOCTL_CREATE_SESSION with invalid name length Date: Mon, 20 Apr 2026 15:15:09 +0100 Message-ID: <20260420141741.2688371-2-luca.boccassi@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260420141741.2688371-1-luca.boccassi@gmail.com> References: <20260420141741.2688371-1-luca.boccassi@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260420_071748_862508_AC1EB299 X-CRM114-Status: GOOD ( 10.21 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org From: Luca Boccassi A session name must not be an empty string, and must not exceed the maximum size define in the uapi header, including null termination. Fixes: 0153094d03df ("liveupdate: luo_session: add sessions support") Signed-off-by: Luca Boccassi Reviewed-by: Pasha Tatashin --- kernel/liveupdate/luo_session.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/liveupdate/luo_session.c b/kernel/liveupdate/luo_session.c index 25ae704d7787..5e316a4c5d71 100644 --- a/kernel/liveupdate/luo_session.c +++ b/kernel/liveupdate/luo_session.c @@ -382,9 +382,13 @@ static int luo_session_getfile(struct luo_session *session, struct file **filep) int luo_session_create(const char *name, struct file **filep) { + size_t len = strnlen(name, LIVEUPDATE_SESSION_NAME_LENGTH); struct luo_session *session; int err; + if (len == 0 || len > LIVEUPDATE_SESSION_NAME_LENGTH - 1) + return -EINVAL; + session = luo_session_alloc(name); if (IS_ERR(session)) return PTR_ERR(session); -- 2.47.3