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 4F741FBF0; Sun, 2 Nov 2025 23:12:58 +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=1762125179; cv=none; b=YpKG4RSAZsk/gE4o2QBQgOUyCz7SPSoymuLLqmuQxw4C9xjC6zglbzW2OroIsNs6zT6HrTdqKkDrlVByw861Uq5dHuiMfBhgNvBhcUI3plSOiB6JmPx0F8LXvIZ1lZVMtdLYrZKEhOjwS7BbRPsRAOtr7HKKX/WRtz/7ygPXNvo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762125179; c=relaxed/simple; bh=s8zI9WG47PjzniQToHXGHJt+ASTAkWITbPaI9IMDaUA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=qI+AR5rpmDIVd6M2zDDHvbQFiHrXnRDo1OMa0ngl8d/p1m6B7Z/6n0kdCZ0q2Cr6+75DETT1FhL37gP5Rs6usYZBc1l1Ttp9qCrqkm6oqG30lw2sM42Oiyg1UChVCI7ecpqKph6P+1RZ6tAhiLMu5eZ48+/LbHcQR8Af6328mAo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=urcobR42; 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="urcobR42" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8C7CC4CEFD; Sun, 2 Nov 2025 23:12:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762125178; bh=s8zI9WG47PjzniQToHXGHJt+ASTAkWITbPaI9IMDaUA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=urcobR42bfmXm6OEX2+u0KT93ekUFr6zjpf9rw08nH7pNZB1AJKceuBBaEhK2Ummd ss3dMtxrfZcsXUFevNiX+Mge3/Pi2tm67Fep3vyZDjUcQ5EnVpvxkOAKoz6BLPMYvp 1OJoqHbsaoVI2DhmaL3BERre1tZrzmAw5IWRptdyIb4XHHw1u9AJ+4Asx+b/Qd7pAQ 4Lt1jQ+QhbqlI9G2JdkM505LY1US33F+CvtDHvMvvO+f06RGvrTtc/tNgo5LvFcjY2 kAFEbj/uuCc1h5h9pLTjLk8wfWfRBE1lmJ3dmy4R9Xg+MXnLjcWzd7KlJFxB0+ccWz 0w4ngzeKy8GPg== From: Christian Brauner Date: Mon, 03 Nov 2025 00:12:41 +0100 Subject: [PATCH 2/8] cred: add kernel_cred() helper 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: 7bit Message-Id: <20251103-work-creds-init_cred-v1-2-cb3ec8711a6a@kernel.org> References: <20251103-work-creds-init_cred-v1-0-cb3ec8711a6a@kernel.org> In-Reply-To: <20251103-work-creds-init_cred-v1-0-cb3ec8711a6a@kernel.org> To: Jens Axboe , Linus Torvalds Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, Christian Brauner X-Mailer: b4 0.15-dev-96507 X-Developer-Signature: v=1; a=openpgp-sha256; l=1180; i=brauner@kernel.org; h=from:subject:message-id; bh=s8zI9WG47PjzniQToHXGHJt+ASTAkWITbPaI9IMDaUA=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWSyPy21enxlCV+euESB3/92nYOpghovv8aLVtycaybCm F2xtLixo5SFQYyLQVZMkcWh3SRcbjlPxWajTA2YOaxMIEMYuDgFYCK/DRkZpvz89HhZGW9Q/1eB /4qfS2OuT2ZP2V/z8nr/1phVHP43HzEybPY7LnXr5JOOotUrGhenZ5d9yU147v9zZ2S7UG3PG7s INgA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Access kernel creds based off of init_task. This will let us avoid any direct access to init_cred. Link: https://patch.msgid.link/20251031-work-creds-init_cred-v1-1-cbf0400d6e0e@kernel.org Signed-off-by: Christian Brauner --- include/linux/cred.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/linux/cred.h b/include/linux/cred.h index 89ae50ad2ace..8ab3718184ad 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -20,6 +20,8 @@ struct cred; struct inode; +extern struct task_struct init_task; + /* * COW Supplementary groups list */ @@ -156,6 +158,11 @@ extern struct cred *prepare_exec_creds(void); extern int commit_creds(struct cred *); extern void abort_creds(struct cred *); extern struct cred *prepare_kernel_cred(struct task_struct *); +static inline const struct cred *kernel_cred(void) +{ + /* shut up sparse */ + return rcu_dereference_raw(init_task.cred); +} extern int set_security_override(struct cred *, u32); extern int set_security_override_from_ctx(struct cred *, const char *); extern int set_create_files_as(struct cred *, struct inode *); -- 2.47.3