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 21C37327786; Mon, 3 Nov 2025 14:57:58 +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=1762181879; cv=none; b=ZRN7LzuuEtEsZvq2iMdHEnlBhnUXLfCqDK3NNWNMY7idZS+5ylZhyWe2oT8SGiNx17jwn1xNQce+uaBBhqF4D17tmcqMcw3jjluKlwBXxKxBwoluRXai8ss7NxpxhsfA4FRQ0cIvjoCcfc2Qh8zScskQu2sP2vr0pJdYa+uRfJ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762181879; c=relaxed/simple; bh=2r6XwBdE0iLPZEXMmxkQmO5kEwjt0ojjL2pn4vmivn4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=CiEOJT4GbZ53DhZG+d1kgXDJ5562PxsjmG+Rh3wFILmNw2hPKkZXCZkBYxnn1lp7k3lnUp2xJcHUZn7biFMPrNTK0GqUlkDm8sPQcjlZOt0T40MABQT0LywEK1ExCjuoemoOCpqupAEjrYmtQdxqmVvD6Hi4YKSPGnwvWeviYJ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s3MQpftP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="s3MQpftP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA4FAC116B1; Mon, 3 Nov 2025 14:57:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762181878; bh=2r6XwBdE0iLPZEXMmxkQmO5kEwjt0ojjL2pn4vmivn4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=s3MQpftPaJnXwoXay0TuEM3GQOP0qNMElUdNNxQ3VSDTxJNZ0o1pxV7Zah//h9Fb0 takiJgBfHtw+6pAcLl89M8RFgURS9kFwrEYk14tB6nEwBelMY130P3bDkvOLCicHmw 09WwSQh4BIPrkpTz2XIPKE12kmNnAUXjzCwilzjR5HZ+yUIVcSF+Df41oQHXTWerxH 5i+vHTmB2SepfDbTuCJJIUOzQJBrkgcqu/jq5Kt+LyOm+5x0laSTeAhxNqEQNy8Q2Q fWKohrWZBXsLOmlGIMndvFJfdSnwUUf3idT27CiY6e5LJUJ5cnpiJhAAZVGkrPOcbU uGherGB3g2jfQ== From: Christian Brauner Date: Mon, 03 Nov 2025 15:57:29 +0100 Subject: [PATCH 03/12] sev-dev: use prepare credential guard Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251103-work-creds-guards-prepare_creds-v1-3-b447b82f2c9b@kernel.org> References: <20251103-work-creds-guards-prepare_creds-v1-0-b447b82f2c9b@kernel.org> In-Reply-To: <20251103-work-creds-guards-prepare_creds-v1-0-b447b82f2c9b@kernel.org> To: Linus Torvalds Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-aio@kvack.org, linux-unionfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, cgroups@vger.kernel.org, netdev@vger.kernel.org, linux-crypto@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Christian Brauner X-Mailer: b4 0.15-dev-96507 X-Developer-Signature: v=1; a=openpgp-sha256; l=926; i=brauner@kernel.org; h=from:subject:message-id; bh=2r6XwBdE0iLPZEXMmxkQmO5kEwjt0ojjL2pn4vmivn4=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWRyHHrxwK71ZMbFrb8PXdDnFNW5cZDbLmClQoSdmGlD7 Q+eG/JrO0pZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACbS+paRYVnc2SvG9W9cb94p X/jDLzJdxCEix9Jyxs2bJ5/K32Du2snIsKG7mMPzwtmtrcccj8pMXvlDwWv94tPnYh9n3Zs97Wl OJiMA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Use the prepare credential guard for allocating a new set of credentials. Signed-off-by: Christian Brauner --- drivers/crypto/ccp/sev-dev.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index c5e22af04abb..09e4c9490d58 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -268,15 +268,16 @@ static struct file *open_file_as_root(const char *filename, int flags, umode_t m get_fs_root(init_task.fs, &root); task_unlock(&init_task); - cred = prepare_creds(); + CLASS(prepare_creds, cred)(); if (!cred) return ERR_PTR(-ENOMEM); + cred->fsuid = GLOBAL_ROOT_UID; old_cred = override_creds(cred); fp = file_open_root(&root, filename, flags, mode); - put_cred(revert_creds(old_cred)); + revert_creds(old_cred); return fp; } -- 2.47.3