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 8F2FE3B5820; Mon, 22 Jun 2026 13:58:53 +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=1782136734; cv=none; b=KMiOzAbI2v/BoWYdmVk8kZkiF/4hb9TyGrTt37VFsOA0DzZgQa2UMPQEIDy4+56kcb05/q3vrINrvkGQFoYLf9eCKHYfVSmACXyGLl4KeSXQGIcvC6ZfGj4dR6LxWUOO7b2QDEdL/P67TLVvDvmwSexfdMKNthAjHGejwEVyjc0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782136734; c=relaxed/simple; bh=EbywcOeBUD/3KDZbFHUyFPmRrJ1Wsf0mAmgqs5EikC0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=ta2pQVNnkyd5PvopY21aYNOBCHgMFlGo5CokHAYLGVqWQ05pi1XVGohQcNx7NYHL+v85WbPZnTuV94lEWQtYavGtuZ28ziGwPc/ss4+JFlwXOqIacpRGLcMTNTF5lu2QRqwVtversvcrQatPORRYvgP4FY9HRJDZ922EI7+u5Eo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I5TeNLy/; 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="I5TeNLy/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE9C31F00A3A; Mon, 22 Jun 2026 13:58:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782136733; bh=7wczdpIjeibGp9rK2iPHI7/hKWAclW8NjbOpMC8+8mA=; h=From:Date:Subject:To:Cc; b=I5TeNLy/ap4Mq5ytoF2Uf5RNlWlP+XlUnvwq2TWFoplyWKCNhqh/OOOYpfXbnjzfa RzrA+tvjsJ9Sj5FkuNOnJdIzTm4L/ndpQzXoWhAAzKU6MbtKtIV+b396SZSgiZUuCA 8/uNBZa/8moPcCsrJNkZ7DnflTLp/qkIvjeOISVAFWEkByASz2rqNDQhZ5jBE6BaJ1 +2cAQOJQKsfxu6wlakVhEFDvkCKy+hiGmlj5umJvGZeyMJSddAhrMAL80bE6e2XglB YOmYP1CQ5y8pCjOGupWNf7yH3useqz8YrAI5eW1HCF1wIHWWobz6XXLJzpxDAjxpGt 5GK7FBzzvbCew== From: Christian Brauner Date: Mon, 22 Jun 2026 15:58:43 +0200 Subject: [PATCH] bpf: have bpf_real_inode() take a struct file 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: 7bit Message-Id: <20260622-work-bpf-real_inode-v1-1-4014eb4cbefd@kernel.org> X-B4-Tracking: v=1; b=H4sIAJI/OWoC/yWM2Q7CIBBFf6XhWQwFocFfaYyZgcHiQhuoS9L03 6X6eO5yFlYoRyrs2Cws0yuWOKYK7a5hboB0IR59ZSaFNMJIyd9jvnGcAs8E93NMoyfuVK09QhC ArD6nTCF+ftb+9OfyxCu5eVNtC4RCHDMkN2zRA8pMea9RqeDMwUrosAMjlbat7jyKYGXQaMhCM Fawdf0C9Znqe7kAAAA= X-Change-ID: 20260622-work-bpf-real_inode-c3202dbaf0ab To: bpf@vger.kernel.org Cc: Alexander Viro , Christian Brauner , Jan Kara , Amir Goldstein , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.16-dev-490fe X-Developer-Signature: v=1; a=openpgp-sha256; l=1717; i=brauner@kernel.org; h=from:subject:message-id; bh=EbywcOeBUD/3KDZbFHUyFPmRrJ1Wsf0mAmgqs5EikC0=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWRZ2s9mnX/18d6bpX9kZhRec9pyTu5rrpu9y5Mvgm2OL Aqb3uy+0VHKwiDGxSArpsji0G4SLrecp2KzUaYGzBxWJpAhDFycAjCR7NkM/7M9T0UXd3kXMU8o FFZZ5md6SIujXEZk9+fs/Ag3/+UG9xn+ik/nOBR8VXdhxOydC95N5JngpmK7aEL4qiv/lu54zXl AiAcA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 bpf_real_inode() must be usable from the bprm_check_security, mmap_file and file_mprotect hooks for systemd's RestrictFilesystemAccess BPF LSM program. It should take a file instead. The kfunc landed this cycle so changing the signature is safe. Fixes: 9af8c8a54f6e ("bpf: add bpf_real_inode() kfunc") Signed-off-by: Christian Brauner (Amutable) --- fs/bpf_fs_kfuncs.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/fs/bpf_fs_kfuncs.c b/fs/bpf_fs_kfuncs.c index 768aca2dc0f0..f941c29d26ef 100644 --- a/fs/bpf_fs_kfuncs.c +++ b/fs/bpf_fs_kfuncs.c @@ -360,18 +360,18 @@ __bpf_kfunc int bpf_cgroup_read_xattr(struct cgroup *cgroup, const char *name__s #endif /* CONFIG_CGROUPS */ /** - * bpf_real_inode - get the real inode backing a dentry - * @dentry: dentry to resolve + * bpf_real_inode - get the real inode backing a file + * @file: file to resolve * - * If the dentry is on a union/overlay filesystem, return the underlying, real + * If the file is on a union/overlay filesystem, return the underlying, real * inode that hosts the data. Otherwise return the inode attached to the - * dentry itself. + * file itself. * - * Return: The real inode backing the dentry, or NULL for a negative dentry. + * Return: The real inode backing the file, or NULL. */ -__bpf_kfunc struct inode *bpf_real_inode(struct dentry *dentry) +__bpf_kfunc struct inode *bpf_real_inode(struct file *file) { - return d_real_inode(dentry); + return d_real_inode(file_dentry(file)); } __bpf_kfunc_end_defs(); --- base-commit: 5b33fc6492a7b7a62359157db0f92f5b6e9af690 change-id: 20260622-work-bpf-real_inode-c3202dbaf0ab