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Wed, 29 Apr 2026 14:22:26 -0700 (PDT) Received: from localhost ([2a01:4b00:d036:ae00:8fc7:44bf:8aca:ebae]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-48a822d4b57sm45356905e9.15.2026.04.29.14.22.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Apr 2026 14:22:26 -0700 (PDT) From: luca.boccassi@gmail.com To: kexec@lists.infradead.org Cc: linux-mm@kvack.org, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, linux-kernel@vger.kernel.org, Luca Boccassi , stable@vger.kernel.org Subject: [PATCH v11 1/4] liveupdate: reject LIVEUPDATE_IOCTL_CREATE_SESSION with invalid name length Date: Wed, 29 Apr 2026 22:21:14 +0100 Message-ID: <20260429212221.814107-2-luca.boccassi@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260429212221.814107-1-luca.boccassi@gmail.com> References: <20260429212221.814107-1-luca.boccassi@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1CF3D4000C X-Stat-Signature: ejjhemeb9mcjs8hn79a888sd4gf8hnmj X-HE-Tag: 1777497747-797511 X-HE-Meta: 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 b3r3GVhN 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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") Cc: stable@vger.kernel.org Signed-off-by: Luca Boccassi Reviewed-by: Pasha Tatashin Reviewed-by: Pratyush Yadav --- 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 a3327a28fc1f..24b4f381d3c8 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