From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A22AFC43462 for ; Sun, 26 Jul 2020 07:15:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 834FC20738 for ; Sun, 26 Jul 2020 07:15:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="i0ov+Gh0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727781AbgGZHOg (ORCPT ); Sun, 26 Jul 2020 03:14:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59924 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725810AbgGZHOd (ORCPT ); Sun, 26 Jul 2020 03:14:33 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E802C0619D4; Sun, 26 Jul 2020 00:14:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=F9Hy9koauyW6Xg8otzwajT43N/kQBbpM16WsbmLZL54=; b=i0ov+Gh0GkxuU1/bB8O20p0unt lwwjxxjKVTrX9BWHBaMNcwFVK19Jr0r4HaMHeIR1lYTJzc6vhKmcPJFDk6e/twN0PSVzvauDUTHv9 WzPI1K1JeYcfYDsRLJ2vn7nOYxo8bGSC7xInoHrZ0ViYQljCM/qj6EXCC/lO8UD5NHo09MxTsFdGE wJr+tDSh3N1MMBxxW1JF+0aXSmdkVbCdJFhzoID9Qn+jOu6ysmroneUgSIOS51sWhimmd7tYmgcDL wP+eaTkMF8x4z/P26+MlLbkQ8NoHbAKg4UyKbQkv8IdxXwo22AZKOAJUaz9ZPG7QRgOzHcxSLxsnw Xs0iLEQw==; Received: from [2001:4bb8:18c:2acc:5ff1:d0b0:8643:670e] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jzarc-0002UV-DL; Sun, 26 Jul 2020 07:14:29 +0000 From: Christoph Hellwig To: Al Viro , Linus Torvalds Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH 14/21] init: add an init_chmod helper Date: Sun, 26 Jul 2020 09:13:49 +0200 Message-Id: <20200726071356.287160-15-hch@lst.de> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200726071356.287160-1-hch@lst.de> References: <20200726071356.287160-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-api-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org Add a simple helper to chmod with a kernel space file name and switch the early init code over to it. Signed-off-by: Christoph Hellwig --- fs/for_init.c | 13 +++++++++++++ fs/internal.h | 2 +- fs/open.c | 4 ++-- include/linux/init_syscalls.h | 1 + include/linux/syscalls.h | 7 ------- init/initramfs.c | 4 ++-- 6 files changed, 19 insertions(+), 12 deletions(-) diff --git a/fs/for_init.c b/fs/for_init.c index 0541851d86f42e..098e9b69c32ef6 100644 --- a/fs/for_init.c +++ b/fs/for_init.c @@ -92,6 +92,19 @@ int __init init_chown(const char *filename, uid_t user, gid_t group, int flags) return error; } +int __init init_chmod(const char *filename, umode_t mode) +{ + struct path path; + int error; + + error = kern_path(filename, LOOKUP_FOLLOW, &path); + if (error) + return error; + error = chmod_common(&path, mode); + path_put(&path); + return error; +} + int __init init_unlink(const char *pathname) { return do_unlinkat(AT_FDCWD, getname_kernel(pathname)); diff --git a/fs/internal.h b/fs/internal.h index e81b9e23c3ea3f..6d82681c7d8372 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -131,7 +131,7 @@ extern struct open_how build_open_how(int flags, umode_t mode); extern int build_open_flags(const struct open_how *how, struct open_flags *op); long do_sys_ftruncate(unsigned int fd, loff_t length, int small); -int do_fchmodat(int dfd, const char __user *filename, umode_t mode); +int chmod_common(const struct path *path, umode_t mode); int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group, int flag); int chown_common(const struct path *path, uid_t user, gid_t group); diff --git a/fs/open.c b/fs/open.c index 49960a1248f14b..7ba89eae46c560 100644 --- a/fs/open.c +++ b/fs/open.c @@ -563,7 +563,7 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename) return error; } -static int chmod_common(const struct path *path, umode_t mode) +int chmod_common(const struct path *path, umode_t mode) { struct inode *inode = path->dentry->d_inode; struct inode *delegated_inode = NULL; @@ -610,7 +610,7 @@ SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode) return err; } -int do_fchmodat(int dfd, const char __user *filename, umode_t mode) +static int do_fchmodat(int dfd, const char __user *filename, umode_t mode) { struct path path; int error; diff --git a/include/linux/init_syscalls.h b/include/linux/init_syscalls.h index 0da59d76133e17..2b1b4dc586825f 100644 --- a/include/linux/init_syscalls.h +++ b/include/linux/init_syscalls.h @@ -6,5 +6,6 @@ int __init init_umount(const char *name, int flags); int __init init_chdir(const char *filename); int __init init_chroot(const char *filename); int __init init_chown(const char *filename, uid_t user, gid_t group, int flags); +int __init init_chmod(const char *filename, umode_t mode); int __init init_unlink(const char *pathname); int __init init_rmdir(const char *pathname); diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index e89d62e944dc0e..8b71fa321ca20c 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -1304,13 +1304,6 @@ static inline long ksys_link(const char __user *oldname, return do_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0); } -extern int do_fchmodat(int dfd, const char __user *filename, umode_t mode); - -static inline int ksys_chmod(const char __user *filename, umode_t mode) -{ - return do_fchmodat(AT_FDCWD, filename, mode); -} - long do_faccessat(int dfd, const char __user *filename, int mode, int flags); static inline long ksys_access(const char __user *filename, int mode) diff --git a/init/initramfs.c b/init/initramfs.c index 919b40fb07bada..f2ec2f024f9e67 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -347,14 +347,14 @@ static int __init do_name(void) } else if (S_ISDIR(mode)) { ksys_mkdir(collected, mode); init_chown(collected, uid, gid, 0); - ksys_chmod(collected, mode); + init_chmod(collected, mode); dir_add(collected, mtime); } else if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { if (maybe_link() == 0) { ksys_mknod(collected, mode, rdev); init_chown(collected, uid, gid, 0); - ksys_chmod(collected, mode); + init_chmod(collected, mode); do_utime(collected, mtime); } } -- 2.27.0