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orangefs: posix acl fix...

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Al Viro pointed out that I broke some acl functionality...

 * ACLs could not be fully removed
 * posix_acl_chmod would be called while the old ACL was still cached
 * new mode propagated to orangefs server before ACL.

... when I tried to make sure that modes that got changed as a
result of ACL-sets would be sent back to the orangefs server.

Not wanting to try and change the code without having some cases to
test it with, I began to hunt for setfacl examples that were expressible
in pure mode. Along the way I found examples like the following
which confused me:

  user A had a file (/home/A/asdf) with mode 740
  user B was in user A's group
  user C was not in user A's group

  setfacl -m u:C:rwx /home/A/asdf

  The above setfacl caused ls -l /home/A/asdf to show a mode of 770,
  making it appear that all users in user A's group now had full access
  to /home/A/asdf, however, user B still only had read acces. Madness.

Anywho, I finally found that the above (whacky as it is) appears to
be "posixly on purpose" and explained in acl(5):

  If the ACL has an ACL_MASK entry, the group permissions correspond
  to the permissions of the ACL_MASK entry.

Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Mike Marshall 2020-07-09 15:02:32 -04:00
parent 92ed301919
commit 476af91933
1 changed files with 10 additions and 9 deletions
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19
fs/orangefs/acl.c
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@ -122,6 +122,8 @@ int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
struct iattr iattr;
int rc;
memset(&iattr, 0, sizeof iattr);
if (type == ACL_TYPE_ACCESS && acl) {
/*
* posix_acl_update_mode checks to see if the permissions
@ -138,18 +140,17 @@ int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
return error;
}
if (acl) {
rc = __orangefs_set_acl(inode, acl, type);
} else {
if (inode->i_mode != iattr.ia_mode)
iattr.ia_valid = ATTR_MODE;
rc = __orangefs_setattr(inode, &iattr);
}
return rc;
} else {
return -EINVAL;
}
rc = __orangefs_set_acl(inode, acl, type);
if (!rc && (iattr.ia_valid == ATTR_MODE))
rc = __orangefs_setattr(inode, &iattr);
return rc;
}
int orangefs_init_acl(struct inode *inode, struct inode *dir)