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b1a37df6ba
Changing owner is controlled by DACL permission WRITE_OWNER. Changing DACL itself is controlled by DACL permisssion WRITE_DAC. Owner of the file has implicit WRITE_DAC permission even when it is not explicitly granted for owner by DACL. Reading DACL or owner is controlled only by one permission READ_CONTROL. WRITE_OWNER permission can be bypassed by the SeTakeOwnershipPrivilege, which is by default available for local administrators. So if the local administrator wants to access some file to which does not have access, it is required to first change owner to ourself and then change DACL permissions. Currently Linux SMB client does not support this because client does not provide a way to change owner without touching DACL permissions. Fix this problem by introducing a new xattr "system.smb3_ntsd_owner" for setting/changing only owner part of the security descriptor. Signed-off-by: Pali Rohár <pali@kernel.org> 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 reStructuredText 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.