From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 F001F3B83E1; Mon, 1 Jun 2026 13:57:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780322233; cv=none; b=XAmAIilkuKJonm4ysFEfKDnH90gHApi7n2gz+NZtm7nM/rwBeJ5c1F6ygWLA8f7D2xQUkLF5XCij/ILB4Dy09oeJcExWC6nCkK+KHxLvPGB5Y8PPr1xiaLE+sYCUOkCnzWxCF6jNMnXr3aiUhhHto/+hbcoatOw6OFlPFCDA5ZQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780322233; c=relaxed/simple; bh=g07l1VDUtYdbYl2ugEK+WnxyfY/aNCNWhYVLFZn/gZ4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=P41DPHnmrn8z+cYbUmYogOrZouh25rn1NXigxYZBag4t/3Dqv0U/A7oBLk+Rb724/DU0IqKNffabOqT1kB26UMRV69JJuNrExDQe46rHzLwNKrX6PwIPBATVJcXjss5GFOrCMvWeuScn6Vc7Jx3ux6ni7ppN42k9oA+V7I5+2jg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bxNlstUw; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bxNlstUw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B6741F00898; Mon, 1 Jun 2026 13:57:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780322231; bh=Zjpyh39ryQoJz0hyLzbwn2P4A3zfjWjOuGIPTVd4GA8=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=bxNlstUwrGHB5lxg9dXndvZ+4swJRRka9x1lOZ7UA1AS/e4zyJasXLisNeiH6ktKw LYAa5htnsqizjTJ1WzmnWwXnmPrNlRf3Oukpw5WRxSXRhZY5ThqlD91EMn9j9pIVmq Lma0o9oGJKLjQZR2Atiof0+jy4qMgWDWaWZJpoOBSUpkvENW3ti5nCzdmaSwrFd0+7 LeVK+s2IJZ9jVzQ0LKE0wG089JIHRu6XvLKgLPuJndWpe5CcWr/jt6osIxjnHDg/ir F+28HF0DCbFfOEaOIwQ/Wg4b3czNEFfCLumCybvdKN8/yjHziFgxsFLOJ/zNkMRCGa sS6obLnSuWOGw== From: Christian Brauner Date: Mon, 01 Jun 2026 15:56:40 +0200 Subject: [PATCH RFC v4 07/25] crypto: ccp: use scoped_with_init_fs() for SEV file access Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260601-work-kthread-nullfs-v4-7-77ee053060e0@kernel.org> References: <20260601-work-kthread-nullfs-v4-0-77ee053060e0@kernel.org> In-Reply-To: <20260601-work-kthread-nullfs-v4-0-77ee053060e0@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , linux-kernel@vger.kernel.org, Alexander Viro , Jan Kara , Jann Horn , "Christian Brauner (Amutable)" X-Mailer: b4 0.16-dev-fffa9 X-Developer-Signature: v=1; a=openpgp-sha256; l=1518; i=brauner@kernel.org; h=from:subject:message-id; bh=g07l1VDUtYdbYl2ugEK+WnxyfY/aNCNWhYVLFZn/gZ4=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWTJ9i8TdQh7kWuvManMZvb9xTWcnx50SaQkfLCVu6R18 KFERjNXRykLgxgXg6yYIotDu0m43HKeis1GmRowc1iZQIYwcHEKwERMXjP8D2wzb3JTMln/9/rJ B23sGb2vVl89apofWGjkf4srYa3PA0aGJU+vd8t65rjbya0Jut/u+VLo9av3vBXXjDaK/yjkNkj mAgA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Replace the manual init_task root retrieval with scoped_with_init_fs() to temporarily override current->fs. This allows using the simpler filp_open() instead of the init_root() + file_open_root() pattern. open_file_as_root() ← sev_read_init_ex_file() / sev_write_init_ex_file() ← sev_platform_init() ← __sev_guest_init() ← KVM ioctl — user process context Needs init's root because the SEV init_ex file path should resolve against the real root, not a KVM user's chroot. Signed-off-by: Christian Brauner (Amutable) --- drivers/crypto/ccp/sev-dev.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index d1e9e0ac63b6..b99737f7f571 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -260,20 +260,16 @@ static int sev_cmd_buffer_len(int cmd) static struct file *open_file_as_root(const char *filename, int flags, umode_t mode) { - struct path root __free(path_put) = {}; - - task_lock(&init_task); - get_fs_root(init_task.fs, &root); - task_unlock(&init_task); - CLASS(prepare_creds, cred)(); if (!cred) return ERR_PTR(-ENOMEM); cred->fsuid = GLOBAL_ROOT_UID; - scoped_with_creds(cred) - return file_open_root(&root, filename, flags, mode); + scoped_with_init_fs() { + scoped_with_creds(cred) + return filp_open(filename, flags, mode); + } } static int sev_read_init_ex_file(void) -- 2.47.3