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 980E7606A32C for ; Mon, 2 Nov 2026 14:23:30 +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=pPmttpDi; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Tw8JvCxX 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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Mon, 2 Nov 2026 14:23:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793629405; bh=Ayyh3GSY9IX8l/NxmtUwOJrSt8ohKQ1xsnTJeKuAZFg=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=Tw8JvCxX+km1KBPRoMXNm8sioLL/SiBihZfuVNjDsAkWtVzRRNmE5Cc7zY4ut+0X5 Rl0KHYQi1x1Sz9PF1RgpgzXpUFQuZfg50HWRXxjw+hQiC/PXAgk/eR8W2vWm2wLiWv tvpKqETwrDFgD85oMKX9xozlc6S0OZ/W5Nh9uZD5F+uNOl4/1vY/ZNRsBNo6TVAbtO 9xct4ES9MUcb8Lk4gqF+MaFsGvGgcXWCF6AdUApSp4FQtJeMZ864LzSIASS1Tvf3o+ oWd+nrIhC/gdzolHINRzQeTdVxMRiw3oiAWCylK9VGym+o8EZsK7NBzyrg6pK/30lF lKmpkvKak5tHQ== From: Christian Brauner Date: Mon, 02 Nov 2026 15:21:22 +0100 Subject: [PATCH RFC 07/38] powerpc/rtas_flash: don't read past the validate message X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-bugfixes-v1-7-59422ed3e465@kernel.org> References: <20261102-work-procfs-bugfixes-v1-0-59422ed3e465@kernel.org> In-Reply-To: <20261102-work-procfs-bugfixes-v1-0-59422ed3e465@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=1303; i=brauner@kernel.org; h=from:subject:message-id; bh=7JHU1Fe1PUKfNakrIeb+3f7MU5rT/9SRwlQjBFg57NM=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9mJN1X2VyVJzM0zaD4pd5IsePH+N4ZpyQLfS98+Jal 7bIPwn8HaUsDGJcDLJiiiwO7Sbhcst5KjYbZWrAzGFlAhnCwMUpADf5CyPDy8QjOeKy0icXe9kL dWRVXnzVHu/eWiK//28XY7LslJsLGf4XMiSre1zfdibVUb/UVG51TJRjtezPFx79q/9o//kddZk LAA== 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 get_validate_flash_msg() adds up what snprintf() returns, which is the length of the whole string and not what fit into msg. If the update results the firmware hands back don't fit into what is left of the 256 bytes, the length ends up larger than msg and validate_flash_read() copies whatever follows it on the stack to userspace. Use scnprintf(). Fixes: a94a14720eaf ("powerpc/rtas_flash: Fix validate_flash buffer overflow issue") Cc: stable@vger.kernel.org Signed-off-by: Christian Brauner (Amutable) --- arch/powerpc/kernel/rtas_flash.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c index 722dbfb6fbf8..f1cd105f7426 100644 --- a/arch/powerpc/kernel/rtas_flash.c +++ b/arch/powerpc/kernel/rtas_flash.c @@ -448,7 +448,7 @@ static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, n = sprintf(msg, "%d\n", args_buf->update_results); if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || (args_buf->update_results == VALIDATE_TMP_UPDATE)) - n += snprintf(msg + n, msglen - n, "%s\n", + n += scnprintf(msg + n, msglen - n, "%s\n", args_buf->buf); } else { n = sprintf(msg, "%d\n", args_buf->status); -- 2.53.0