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nfs: use vfs setgid helper

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commit 4f704d9a8352f5c0a8fcdb6213b934630342bd44 upstream.

We've aligned setgid behavior over multiple kernel releases. The details
can be found in the following two merge messages:
cf619f891971 ("Merge tag 'fs.ovl.setgid.v6.2')
426b4ca2d6 ("Merge tag 'fs.setgid.v6.0')
Consistent setgid stripping behavior is now encapsulated in the
setattr_should_drop_sgid() helper which is used by all filesystems that
strip setgid bits outside of vfs proper. Switch nfs to rely on this
helper as well. Without this patch the setgid stripping tests in
xfstests will fail.

Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Message-Id: <20230313-fs-nfs-setgid-v2-1-9a59f436cfc0@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
[ Harshit: backport to 6.1.y:
  fs/internal.h -- minor conflict due to code change differences.
  include/linux/fs.h -- Used struct user_namespace *mnt_userns
                        instead of struct mnt_idmap *idmap
  fs/nfs/inode.c -- Used init_user_ns instead of nop_mnt_idmap ]
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Brauner 2023-03-14 12:51:10 +01:00 committed by Greg Kroah-Hartman
parent a0ec52f36c
commit 362ed5d931
4 changed files with 4 additions and 5 deletions
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1
fs/attr.c
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@ -47,6 +47,7 @@ int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
return ATTR_KILL_SGID;
return 0;
}
EXPORT_SYMBOL(setattr_should_drop_sgid);
/**
* setattr_should_drop_suidgid - determine whether the set{g,u}id bit needs to

2
fs/internal.h
View File

@ -242,5 +242,3 @@ ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *po
/*
* fs/attr.c
*/
int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
const struct inode *inode);

4
fs/nfs/inode.c
View File

@ -717,9 +717,7 @@ void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
inode->i_mode & S_ISUID)
inode->i_mode &= ~S_ISUID;
if ((attr->ia_valid & ATTR_KILL_SGID) != 0 &&
(inode->i_mode & (S_ISGID | S_IXGRP)) ==
(S_ISGID | S_IXGRP))
if (setattr_should_drop_sgid(&init_user_ns, inode))
inode->i_mode &= ~S_ISGID;
if ((attr->ia_valid & ATTR_MODE) != 0) {
int mode = attr->ia_mode & S_IALLUGO;

2
include/linux/fs.h
View File

@ -3120,6 +3120,8 @@ extern struct inode *new_inode(struct super_block *sb);
extern void free_inode_nonrcu(struct inode *inode);
extern int setattr_should_drop_suidgid(struct user_namespace *, struct inode *);
extern int file_remove_privs(struct file *);
int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
const struct inode *inode);
/*
* This must be used for allocating filesystems specific inodes to set