From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1D649606CA5F for ; Wed, 4 Nov 2026 17:30:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=gXpsVmaN; 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-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; 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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-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-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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