From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C36715AE3 for ; Wed, 9 Aug 2023 10:50:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C42D9C433C8; Wed, 9 Aug 2023 10:50:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691578201; bh=YDN/hNZBg2X4BCNR8eJi+x2jHSDhKxLLzBqQxjGZn2Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qvCJWI75lMh4B9SDdsxaE9bX6ZI7QJOvIaqqZzxv5jnZQn6Bh0uXFdlthcAgAJfe/ peSqH+KN3eRDtxYqVXxoegtyRKoMUkSt1dsnyMIurTGbEDiIekBODydGIc8edTVAmH J1LSJl0WNac6Kgt7POrtUJZoyuBN359TvH8DBlvA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jan Kara , Christian Brauner Subject: [PATCH 6.4 142/165] fs: Protect reconfiguration of sb read-write from racing writes Date: Wed, 9 Aug 2023 12:41:13 +0200 Message-ID: <20230809103647.451989226@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809103642.720851262@linuxfoundation.org> References: <20230809103642.720851262@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jan Kara commit c541dce86c537714b6761a79a969c1623dfa222b upstream. The reconfigure / remount code takes a lot of effort to protect filesystem's reconfiguration code from racing writes on remounting read-only. However during remounting read-only filesystem to read-write mode userspace writes can start immediately once we clear SB_RDONLY flag. This is inconvenient for example for ext4 because we need to do some writes to the filesystem (such as preparation of quota files) before we can take userspace writes so we are clearing SB_RDONLY flag before we are fully ready to accept userpace writes and syzbot has found a way to exploit this [1]. Also as far as I'm reading the code the filesystem remount code was protected from racing writes in the legacy mount path by the mount's MNT_READONLY flag so this is relatively new problem. It is actually fairly easy to protect remount read-write from racing writes using sb->s_readonly_remount flag so let's just do that instead of having to workaround these races in the filesystem code. [1] https://lore.kernel.org/all/00000000000006a0df05f6667499@google.com/T/ Signed-off-by: Jan Kara Message-Id: <20230615113848.8439-1-jack@suse.cz> Signed-off-by: Christian Brauner Signed-off-by: Greg Kroah-Hartman --- fs/super.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) --- a/fs/super.c +++ b/fs/super.c @@ -903,6 +903,7 @@ int reconfigure_super(struct fs_context struct super_block *sb = fc->root->d_sb; int retval; bool remount_ro = false; + bool remount_rw = false; bool force = fc->sb_flags & SB_FORCE; if (fc->sb_flags_mask & ~MS_RMT_MASK) @@ -920,7 +921,7 @@ int reconfigure_super(struct fs_context bdev_read_only(sb->s_bdev)) return -EACCES; #endif - + remount_rw = !(fc->sb_flags & SB_RDONLY) && sb_rdonly(sb); remount_ro = (fc->sb_flags & SB_RDONLY) && !sb_rdonly(sb); } @@ -950,6 +951,14 @@ int reconfigure_super(struct fs_context if (retval) return retval; } + } else if (remount_rw) { + /* + * We set s_readonly_remount here to protect filesystem's + * reconfigure code from writes from userspace until + * reconfigure finishes. + */ + sb->s_readonly_remount = 1; + smp_wmb(); } if (fc->ops->reconfigure) {