From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 14C04606CA61 for ; Wed, 4 Nov 2026 17:30:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=bKrAUcOe Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4jKXX85QYYz2xrC; Thu, 05 Nov 2026 04:30:32 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=172.105.4.254 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1793813432; cv=none; b=G4efk0Q5FjueViSxMT7VcOdb04o/UDWaR63ru+0rs5eCZWP0sP0OujROgMV0/p/w8LYkLMJuuF0X+cClxOORCUv2Zd/G2qXkBQJ081Er6QDwNmS5hX0tQnnzGl1d48ET0YUkutzImNrwwxQC/kJnpusiGhgO+74GiKv+FaQ9kSQtwfxAvpluaCJWt1tjLc2VLR2teL69v9Fx5cbdrIOkynxilOxIpOs8Wk6nOzih94kcTm8qSyOArlg+IclN4/IOyKB18UZdu2qoCm1MH29wXeRQUGzHvlDGACe6jgsB2Ut0dc/gNtkyr0Q80JEqVET4irmETFxAtAJmwoSHb9Ug6Q== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1793813432; c=relaxed/relaxed; bh=gnzz2fT926tAung/y7Xzshf60AQanFXIqjFC5KSqJW4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=D4NxUH2wCcff/YmU7veyuDAXZ0fyiEfCrBzvJ1xTtIku6gKbqFQsKTRhSXkBBLjzTym8DNwlsG8aSxNSLOZcSxiMWrsJbLSOgjFdRdXkNFsNiEm2YsWfufuUbZjPOeRUFpE1yVZk36xRnV/5TlZa9CWO+yYkiDTEoLNO56G/lJHvvrFoOL00EhDZPbn+QobzgM4A1j4ZdMZ6neQRGPIDkeeQnzBYe2R605LTHk0h/ly1+pQ1o1qZoYXQ+/pCH+IylskjTH3c3aPiNjaoRQkEFJDPV2qUVOPXL77IiGWRwogFEZ9UxgTCl5NQl292NkjYn8C6HO4Q/eh6zRtcwPtNLw== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=bKrAUcOe; dkim-atps=neutral; spf=pass (client-ip=172.105.4.254; helo=tor.source.kernel.org; envelope-from=brauner@kernel.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=bKrAUcOe; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=172.105.4.254; helo=tor.source.kernel.org; envelope-from=brauner@kernel.org; receiver=lists.ozlabs.org) Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4jKXX76M5Zz2xm5 for ; Thu, 05 Nov 2026 04:30:31 +1100 (AEDT) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 00A7260A9D; Wed, 4 Nov 2026 17:30:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D051B1F00A20; Wed, 4 Nov 2026 17:30:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793813429; bh=gnzz2fT926tAung/y7Xzshf60AQanFXIqjFC5KSqJW4=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=bKrAUcOeVzlg83/euOIHnVFterm+vHdMFNuNi2Dt0LF9VzWRfSHdWlR7H5c2KTzRF naRK5w+k54/QDDCRMfWgLxdTPqv4FCwBsr1kXOzQqhEOlC8vy1IWJ41ODhEZLno2LS jjGH8/XSd1jADyBL1p3Hc3Qgb7ui9/GDGzwbwzjY67qrbN3GQL5NP2Jybx4qUpUZX3 CQMNjfOnMG5qtjvL2qoA6KmgJggxXjaC2t2PuKCscK2/RkukWsmgaXtZ0l6oKz5iz+ P64zZ0Jt2cdani8OUoo4/+XjtpVm+osPlwpgz43htAz/C7aUhFTjPEXATp/jT4GDYM 7OqOzge6sGwYQ== From: Christian Brauner Date: Wed, 04 Nov 2026 18:27:25 +0100 Subject: [PATCH v2 08/51] powerpc/pseries/lparcfg: don't drop the last byte of a write X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261104-work-procfs-bugfixes-v2-8-bbf7d5546809@kernel.org> References: <20261104-work-procfs-bugfixes-v2-0-bbf7d5546809@kernel.org> In-Reply-To: <20261104-work-procfs-bugfixes-v2-0-bbf7d5546809@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever , stable@vger.kernel.org X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1293; i=brauner@kernel.org; h=from:subject:message-id; bh=N2rHHHUzfsZsGLUBvdMxa3o2qGAAPzh8wsvUFn8S2uA=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9zmYqts+f6c771jBc691PB/aNiq5rYmuWq7o9SdKKM Ga7qdvUUcrCIMbFICumyOLQbhIut5ynYrNRpgbMHFYmkCEMXJwCMJFb8gz/a+f8MlT+0SWxMsTk QerGWIU8g/w227Ptd+ManyhO269pzsgwb7VmgtgD7UuXjjF+CvlTU3NkGv8+HhW+PC2DOSyTg2v 5AQ== X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 lparcfg_write() terminates its copy of the write by overwriting the last byte, so a write without a trailing newline loses its last character: "partition_entitled_capacity=5" is parsed as an empty value and fails with -EINVAL. Terminate behind the copy instead, and refuse a write that fills the whole buffer, which can't be terminated. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Christian Brauner (Amutable) --- arch/powerpc/platforms/pseries/lparcfg.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c index 3280b7968cab..9882f98c0efb 100644 --- a/arch/powerpc/platforms/pseries/lparcfg.c +++ b/arch/powerpc/platforms/pseries/lparcfg.c @@ -699,13 +699,12 @@ static ssize_t lparcfg_write(struct file *file, const char __user * buf, if (!firmware_has_feature(FW_FEATURE_SPLPAR)) return -EINVAL; - if (count == 0 || count > sizeof(kbuf)) + if (count == 0 || count >= sizeof(kbuf)) return -EINVAL; if (copy_from_user(kbuf, buf, count)) return -EFAULT; - - kbuf[count - 1] = '\0'; + kbuf[count] = '\0'; tmp = strchr(kbuf, '='); if (!tmp) return -EINVAL; -- 2.53.0