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21cb47be6f
The inode_owner_or_capable() helper determines whether the caller is the owner of the inode or is capable with respect to that inode. Allow it to handle idmapped mounts. If the inode is accessed through an idmapped mount it according to the mount's user namespace. Afterwards the checks are identical to non-idmapped mounts. If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Similarly, allow the inode_init_owner() helper to handle idmapped mounts. It initializes a new inode on idmapped mounts by mapping the fsuid and fsgid of the caller from the mount's user namespace. If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Link: https://lore.kernel.org/r/20210121131959.646623-7-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Morris <jamorris@linux.microsoft.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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*/
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#include <linux/fs.h>
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#include <linux/quotaops.h>
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#include "jfs_incore.h"
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#include "jfs_inode.h"
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#include "jfs_filsys.h"
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#include "jfs_imap.h"
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#include "jfs_dinode.h"
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#include "jfs_debug.h"
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void jfs_set_inode_flags(struct inode *inode)
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{
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unsigned int flags = JFS_IP(inode)->mode2;
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unsigned int new_fl = 0;
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if (flags & JFS_IMMUTABLE_FL)
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new_fl |= S_IMMUTABLE;
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if (flags & JFS_APPEND_FL)
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new_fl |= S_APPEND;
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if (flags & JFS_NOATIME_FL)
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new_fl |= S_NOATIME;
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if (flags & JFS_DIRSYNC_FL)
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new_fl |= S_DIRSYNC;
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if (flags & JFS_SYNC_FL)
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new_fl |= S_SYNC;
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inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND | S_NOATIME |
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S_DIRSYNC | S_SYNC);
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}
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/*
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* NAME: ialloc()
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*
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* FUNCTION: Allocate a new inode
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*
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*/
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struct inode *ialloc(struct inode *parent, umode_t mode)
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{
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struct super_block *sb = parent->i_sb;
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struct inode *inode;
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struct jfs_inode_info *jfs_inode;
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int rc;
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inode = new_inode(sb);
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if (!inode) {
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jfs_warn("ialloc: new_inode returned NULL!");
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return ERR_PTR(-ENOMEM);
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}
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jfs_inode = JFS_IP(inode);
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rc = diAlloc(parent, S_ISDIR(mode), inode);
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if (rc) {
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jfs_warn("ialloc: diAlloc returned %d!", rc);
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goto fail_put;
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}
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if (insert_inode_locked(inode) < 0) {
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rc = -EINVAL;
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goto fail_put;
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}
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inode_init_owner(&init_user_ns, inode, parent, mode);
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/*
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* New inodes need to save sane values on disk when
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* uid & gid mount options are used
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*/
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jfs_inode->saved_uid = inode->i_uid;
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jfs_inode->saved_gid = inode->i_gid;
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/*
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* Allocate inode to quota.
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*/
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rc = dquot_initialize(inode);
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if (rc)
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goto fail_drop;
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rc = dquot_alloc_inode(inode);
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if (rc)
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goto fail_drop;
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/* inherit flags from parent */
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jfs_inode->mode2 = JFS_IP(parent)->mode2 & JFS_FL_INHERIT;
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if (S_ISDIR(mode)) {
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jfs_inode->mode2 |= IDIRECTORY;
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jfs_inode->mode2 &= ~JFS_DIRSYNC_FL;
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}
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else {
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jfs_inode->mode2 |= INLINEEA | ISPARSE;
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if (S_ISLNK(mode))
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jfs_inode->mode2 &= ~(JFS_IMMUTABLE_FL|JFS_APPEND_FL);
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}
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jfs_inode->mode2 |= inode->i_mode;
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inode->i_blocks = 0;
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inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
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jfs_inode->otime = inode->i_ctime.tv_sec;
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inode->i_generation = JFS_SBI(sb)->gengen++;
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jfs_inode->cflag = 0;
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/* Zero remaining fields */
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memset(&jfs_inode->acl, 0, sizeof(dxd_t));
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memset(&jfs_inode->ea, 0, sizeof(dxd_t));
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jfs_inode->next_index = 0;
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jfs_inode->acltype = 0;
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jfs_inode->btorder = 0;
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jfs_inode->btindex = 0;
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jfs_inode->bxflag = 0;
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jfs_inode->blid = 0;
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jfs_inode->atlhead = 0;
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jfs_inode->atltail = 0;
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jfs_inode->xtlid = 0;
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jfs_set_inode_flags(inode);
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jfs_info("ialloc returns inode = 0x%p", inode);
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return inode;
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fail_drop:
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dquot_drop(inode);
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inode->i_flags |= S_NOQUOTA;
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clear_nlink(inode);
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discard_new_inode(inode);
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return ERR_PTR(rc);
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fail_put:
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iput(inode);
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return ERR_PTR(rc);
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}
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