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 062796FA1 for ; Mon, 3 Apr 2023 14:25:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82010C433D2; Mon, 3 Apr 2023 14:25:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680531917; bh=1oxUom6yZBsD5bhDWZ+GhCNF0prAnTjRbDDGMpAXb1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OpxINuVtQI7iXb/fVEIo7blFIkqn0nvCQ3jaFszJvBX6XtHBddKU280++J8xojL37 RlhnlUfELM6oWye2RUB6GIB1SWhVEO1eaKaXrMV1m63DJBNVBQU80Z7GIRvGi2wHkB W3c8NfvHMD7EOQojWlBBffGQIEmGKq1x5M9aF8Js= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tzung-Bi Shih , Guenter Roeck , Sasha Levin Subject: [PATCH 5.10 057/173] platform/chrome: cros_ec_chardev: fix kernel data leak from ioctl Date: Mon, 3 Apr 2023 16:07:52 +0200 Message-Id: <20230403140416.309318523@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140414.174516815@linuxfoundation.org> References: <20230403140414.174516815@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: Tzung-Bi Shih [ Upstream commit b20cf3f89c56b5f6a38b7f76a8128bf9f291bbd3 ] It is possible to peep kernel page's data by providing larger `insize` in struct cros_ec_command[1] when invoking EC host commands. Fix it by using zeroed memory. [1]: https://elixir.bootlin.com/linux/v6.2/source/include/linux/platform_data/cros_ec_proto.h#L74 Fixes: eda2e30c6684 ("mfd / platform: cros_ec: Miscellaneous character device to talk with the EC") Signed-off-by: Tzung-Bi Shih Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20230324010658.1082361-1-tzungbi@kernel.org Signed-off-by: Sasha Levin --- drivers/platform/chrome/cros_ec_chardev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/platform/chrome/cros_ec_chardev.c b/drivers/platform/chrome/cros_ec_chardev.c index 0de7c255254e0..d6de5a2941282 100644 --- a/drivers/platform/chrome/cros_ec_chardev.c +++ b/drivers/platform/chrome/cros_ec_chardev.c @@ -284,7 +284,7 @@ static long cros_ec_chardev_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg) u_cmd.insize > EC_MAX_MSG_BYTES) return -EINVAL; - s_cmd = kmalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize), + s_cmd = kzalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize), GFP_KERNEL); if (!s_cmd) return -ENOMEM; -- 2.39.2