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0f22053e81
With the "cifsacl" mount option, the mode bits set on the file/dir is converted to corresponding ACEs in DACL. However, only the ALLOWED ACEs were being set for "owner" and "group" SIDs. Since owner is a subset of group, and group is a subset of everyone/world SID, in order to properly emulate unix perm groups, we need to add DENIED ACEs. If we don't do that, "owner" and "group" SIDs could get more access rights than they should. Which is what was happening. This fixes it. We try to keep the "preferred" order of ACEs, i.e. DENYs followed by ALLOWs. However, for a small subset of cases we cannot maintain the preferred order. In that case, we'll end up with the DENY ACE for group after the ALLOW for the owner. If owner SID == group SID, use the more restrictive among the two perm bits and convert them to ACEs. Also, for reverse mapping, i.e. to convert ACL to unix perm bits, for the "others" bits, we needed to add the masked bits of the owner and group masks to others mask. Updated version of patch fixes a problem noted by the kernel test robot. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.