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 4833D30C35C; Thu, 5 Mar 2026 23:30:31 +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=1772753431; cv=none; b=umDDayKleE5oIgpadI0xZmbZOg9JcrjZMwmMotnToKnDvY8xVf7DiXstyvjtr+WzhTGPW6kRh2Sxrl7Y522ZsX4gS4VW0/XLJ1mrmMpe+T7n5eNMGVCq8C83vYTDAyrj8Yq6rfoNxdfWpv4lZOdFoqaX7Ay0OTUHJmWQqcxTl1Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772753431; c=relaxed/simple; bh=GZsbB5/oS0c6lwFJZSOuaHi3hJ1zBvMulcElef7p9ak=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=XEbLeDD18quc8nFX9imlI/LUY9UaSLtIvLWeCioTBQn4M5pL+jQbtldwIYWFAJMprDJZUULEwNFZXbgtpVt11CTPTkDrYI2ulgxXiMltlh9VnQXUXzRfy8wPxsqBRNZ0PIZ9hdn3u8pQeCueh8Jv9Cl5984SRVly/C0wR/86jxg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=H+WSp9HB; 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="H+WSp9HB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ED34DC2BCAF; Thu, 5 Mar 2026 23:30:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772753431; bh=GZsbB5/oS0c6lwFJZSOuaHi3hJ1zBvMulcElef7p9ak=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=H+WSp9HBLcJEoo8qEvE0WuHJImxdXCE8ZgJ8caPYMyUJMFzb1jTsOS4wLA5flFg8V mAFxumNB5tQY3PcNAGfztfNpMMHtQkLridjuFqKnlpShJAlkN/bndcsr8X1f1I/kCP nqWoAyBrLkifZXZzf/F+gLWv/2KEN1+TuNo8qnBMhX9jzXEVMJZlVbJRMl3Oshzezi 578xmsTIS9gZS5f3R9T5xESK9anU24oEdLD4m/FYn2VI3DyC5gqPosBofK0YrTtha3 YwDZNVTh06PSoZGSdsTiRekDUL7l/sZ4wp7v1D27D/KdJfbEA9ZbY/e13m8cpIq4HA s2J/K85BH539w== From: Christian Brauner Date: Fri, 06 Mar 2026 00:30:07 +0100 Subject: [PATCH RFC v2 04/23] crypto: ccp: use scoped_with_init_fs() for SEV file access Precedence: bulk X-Mailing-List: linux-fsdevel@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: <20260306-work-kthread-nullfs-v2-4-ad1b4bed7d3e@kernel.org> References: <20260306-work-kthread-nullfs-v2-0-ad1b4bed7d3e@kernel.org> In-Reply-To: <20260306-work-kthread-nullfs-v2-0-ad1b4bed7d3e@kernel.org> To: linux-fsdevel@vger.kernel.org, Linus Torvalds Cc: linux-kernel@vger.kernel.org, Alexander Viro , Jens Axboe , Jan Kara , Tejun Heo , Jann Horn , Christian Brauner X-Mailer: b4 0.15-dev-47773 X-Developer-Signature: v=1; a=openpgp-sha256; l=1507; i=brauner@kernel.org; h=from:subject:message-id; bh=GZsbB5/oS0c6lwFJZSOuaHi3hJ1zBvMulcElef7p9ak=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWSuEuI8baaxrvvpnqku04XTEuau7Jsbv8jLSdRzF8eZR AVR+3lHO0pZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACaia8zIMJXvW2XqkmPyEQGB RxPm7Ft85IfYt4sCqkdaDGdvd0pu+cbIsMj6/MvF26rz3E4u3y68OtlpRmy65V/DFp5X2ckC+/d b8AEA 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 --- 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 096f993974d1..4320054da0f6 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