From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794048307; b=dVfKgntwE1qj8YQr48i7gwsM06Kv4ioK024dMKj/R6qxV4L8MXyYfkOmTZcp6aLWy/ma Ze91wXCw1yT75X83PEwah/kq/AnHu1eaGi6HA7ZLhwwTvsNBKagemKnlsY4AZaPHomF47 due+iP9oBvCBi54uGyQsOqeWJDQ2Q198qm0pvzvy/auRgFnxbTomQQUoaMtdKC6JKXFvR 6jP7UOMgy+7EeDyv4TgFcJy1Ocr753dKyUM0Su1NOFM0kLLK1HpAtnGw2MqOxyE8F/kyg RLWe9JvCfvABbXl71+aifzZfFUtDl5hxgYuVlCe6iH8k7pDwiJPXRbILXB6nvSj/Ung== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794048307; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=Q1AF6bmza6SQuDYvPNn33zILT6XzPchaVTClqG1x3Jk=; b=bCcy7kVaHzkgkIpVG84a65qZV4Yp6x+0IGqkvoqPYqAYPxyDnDwnwh0JwZBFsDJZQQTp FhfD4LGUBdh6O0P2Q1714R2xfizqK5gWXIXpVBmcP7+q5zLw+tv4Lzu8jnDBNMQzQM5uH CAzLZSoTY97S7YOTijv240kgtQHSw7HyZNy3v7m608qS6JCODZc833k9GsQ99p5TOC0Q0 Wsk7jVa7Q+8hRcd+wcUpC/JdCDQnjgrpLgtsNvK09JxidKhPp57Q/r7koY6wDKnV9AeeD dzc7pJV1npGHjFGWdijN/Jziv3233/j0zDVOAHsPyBwBZqz+6yKKRBbRLh4PsoFqJSg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=VtBjCUVi; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 37715606A326 for ; Sat, 7 Nov 2026 10:45:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=VtBjCUVi Received: by smtp.kernel.org (Postfix) with ESMTPSA id 913E31F0089F; Sat, 7 Nov 2026 10:45:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794048307; bh=Q1AF6bmza6SQuDYvPNn33zILT6XzPchaVTClqG1x3Jk=; h=From:To:Cc:Subject:Date; b=VtBjCUVihNEVjU6vN7VLPxt92/7oDZD2TZt6JAVNp/Lz++tYprDYxjykxUkHHMw8K 3THrJvMInn2erHePxLQkcigQ4/UNPOCJ7Hv0ci/5rtIp6oWMlYmfzUNBfmDPeuh1oY qTRNFf2tD+f1J/0O9us1f71G4yPvsKVgElBucER9uie/1GpH8a83pcCHmdYgL++yrr 0b7kUs7k3wQ8xcM5X0jC7b622+2tva0QzLsQN+ydtxVL1jimBV6IHVF2Ib46RlwH6H f1OMKnfGiprnon0tyZv1dFkijfmM7oTaQ2y1NNPGrT2+nTiP/xesm9KNHMX10aNl2s KNj9aG9FFbQGg== From: Sasha Levin To: blum@kernel.org, akpm@linux-foundation.org, dmoulding@me.com Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] init: fix early boot crash with bare hostname parameter" failed to apply to 6.1-stable tree Date: Sat, 7 Nov 2026 05:45:05 -0500 Message-ID: <20261107054505-failed-6.1-b6bec5b63a5b@kernel.org> X-Mailer: git-send-email 2.53.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x b6bec5b63a5b812145e53aaad1e63661c7214f93 # git commit -s git send-email --to '' --in-reply-to '20261107054505-failed-6.1-b6bec5b63a5b@kernel.org' --subject-prefix 'PATCH 6.1.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From b6bec5b63a5b812145e53aaad1e63661c7214f93 Mon Sep 17 00:00:00 2001 From: Thorsten Blum Date: Wed, 26 Aug 2026 12:09:03 +0200 Subject: [PATCH] init: fix early boot crash with bare hostname parameter When a bare hostname parameter is specified on the kernel command line without the '=' separator, early parameter parsing passes NULL to early_hostname(), which dereferences it in strscpy() and can crash the system during early boot. Reject NULL values in early_hostname() and return -EINVAL instead. Link: https://lore.kernel.org/20260826100904.296151-2-blum@kernel.org Fixes: 5a704629f2c1 ("init: add "hostname" kernel parameter") Signed-off-by: Thorsten Blum Signed-off-by: Andrew Morton Cc: Dan Moulding Cc: --- init/version.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/init/version.c b/init/version.c index 94c96f6fbfe6a..0bd5c45aabc46 100644 --- a/init/version.c +++ b/init/version.c @@ -23,6 +23,9 @@ static int __init early_hostname(char *arg) size_t maxlen = bufsize - 1; ssize_t arglen; + if (!arg) + return -EINVAL; + arglen = strscpy(init_uts_ns.name.nodename, arg, bufsize); if (arglen < 0) { pr_warn("hostname parameter exceeds %zd characters and will be truncated", -- 2.53.0