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Re: [PATCH v27 02/21] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags

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  Re: [PATCH v27 02/21] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR  permission flags Miklos Szeredi <miklos@szeredi.hu> - 2016-12-02 10:30 +0100

#1534762 — Re: [PATCH v27 02/21] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags

On Tue, Oct 11, 2016 at 2:50 PM, Andreas Gruenbacher
<agruenba@redhat.com> wrote:
> Richacls distinguish between creating non-directories and directories. To
> support that, add an isdir parameter to may_create(). When checking
> inode_permission() for create permission, pass in an additional
> MAY_CREATE_FILE or MAY_CREATE_DIR mask flag.
>
> Add may_replace() to allow checking for delete and create access when
> replacing an existing file in vfs_rename().

That works for plain rename, but not for RENAME_EXCHANGE: is_dir and
new_is_dir may be different, which means we can be deleting a
non-directory *and* creating a directory in one dir and vice versa in
the other.

Thanks,
Miklos

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