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 22FE0223316; Mon, 23 Jun 2025 22:08:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750716530; cv=none; b=q+inXewkDCuCGT4tLkQ2N+LnyNUNg9UEZ+ucWZotL6rgWAeVe3f/ksFyvdmXFtvKQJLOMMKuXYPJTfxMHzivjlAx4E5ZWlunEL2fenLibcyyjXzbHRT+QYpFBboic4WRXd7oxJxPSg1FriJvJkX/oarmjyi7jsQfnb7+yaFWYlc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750716530; c=relaxed/simple; bh=8bnccDJNxtxuQGcfmh/74rZwbBu1NNu/1drhb4Qcaig=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kd2viHsqWa/Fhdv/OF2jRfL832e38hdtU1YgqTT+nOs+4KzsPWDBMM8JEXBPl0rXlSOrtYdn9rGAD1uE7dom2zvGL58egzh5FegmaJczjXIQiToynqRljYeAL6VhUqMSBlyLUzSAR2xDwmiTcI2++elWp0K4AtsN691EyTYz1gk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mCG1fE4j; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="mCG1fE4j" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6AE9DC4CEEA; Mon, 23 Jun 2025 22:08:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750716529; bh=8bnccDJNxtxuQGcfmh/74rZwbBu1NNu/1drhb4Qcaig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mCG1fE4j9EDsISoGm/2QMdyhnLjwz3icbpfQoIx231bDUBP6152c2zJUTxQa7PZcv 0In865XzPANcq+9hbxA1lN/oC3hFX8tMUPAH1xHFlBsHGbT8obIs7/qlbcFzQCinqt IC4leIjxVmxq+pR8mQ+8/45QWzvMLf+6dou7PKnQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jann Horn , Jens Wiklander , Rouven Czerwinski , Sasha Levin Subject: [PATCH 6.12 286/414] tee: Prevent size calculation wraparound on 32-bit kernels Date: Mon, 23 Jun 2025 15:07:03 +0200 Message-ID: <20250623130649.166297662@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250623130642.015559452@linuxfoundation.org> References: <20250623130642.015559452@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jann Horn [ Upstream commit 39bb67edcc582b3b386a9ec983da67fa8a10ec03 ] The current code around TEE_IOCTL_PARAM_SIZE() is a bit wrong on 32-bit kernels: Multiplying a user-provided 32-bit value with the size of a structure can wrap around on such platforms. Fix it by using saturating arithmetic for the size calculation. This has no security consequences because, in all users of TEE_IOCTL_PARAM_SIZE(), the subsequent kcalloc() implicitly checks for wrapping. Signed-off-by: Jann Horn Signed-off-by: Jens Wiklander Tested-by: Rouven Czerwinski Signed-off-by: Sasha Levin --- drivers/tee/tee_core.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index d113679b1e2d7..acc7998758ad8 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -19,7 +20,7 @@ #define TEE_NUM_DEVICES 32 -#define TEE_IOCTL_PARAM_SIZE(x) (sizeof(struct tee_param) * (x)) +#define TEE_IOCTL_PARAM_SIZE(x) (size_mul(sizeof(struct tee_param), (x))) #define TEE_UUID_NS_NAME_SIZE 128 @@ -487,7 +488,7 @@ static int tee_ioctl_open_session(struct tee_context *ctx, if (copy_from_user(&arg, uarg, sizeof(arg))) return -EFAULT; - if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len) + if (size_add(sizeof(arg), TEE_IOCTL_PARAM_SIZE(arg.num_params)) != buf.buf_len) return -EINVAL; if (arg.num_params) { @@ -565,7 +566,7 @@ static int tee_ioctl_invoke(struct tee_context *ctx, if (copy_from_user(&arg, uarg, sizeof(arg))) return -EFAULT; - if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len) + if (size_add(sizeof(arg), TEE_IOCTL_PARAM_SIZE(arg.num_params)) != buf.buf_len) return -EINVAL; if (arg.num_params) { @@ -699,7 +700,7 @@ static int tee_ioctl_supp_recv(struct tee_context *ctx, if (get_user(num_params, &uarg->num_params)) return -EFAULT; - if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) != buf.buf_len) + if (size_add(sizeof(*uarg), TEE_IOCTL_PARAM_SIZE(num_params)) != buf.buf_len) return -EINVAL; params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL); @@ -798,7 +799,7 @@ static int tee_ioctl_supp_send(struct tee_context *ctx, get_user(num_params, &uarg->num_params)) return -EFAULT; - if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) > buf.buf_len) + if (size_add(sizeof(*uarg), TEE_IOCTL_PARAM_SIZE(num_params)) > buf.buf_len) return -EINVAL; params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL); -- 2.39.5