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ede57be88a
commit 4491001c2e0fa69efbb748c96ec96b100a5cdb7e upstream. Bounce all data on the skbs to be transmitted into zeroed pages if the backend is untrusted. This avoids leaking data present in the pages shared with the backend but not part of the skb fragments. This requires introducing a new helper in order to allocate skbs with a size multiple of XEN_PAGE_SIZE so we don't leak contiguous data on the granted pages. Reporting whether the backend is to be trusted can be done using a module parameter, or from the xenstore frontend path as set by the toolstack when adding the device. This is CVE-2022-33741, part of XSA-403. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| README | ||
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.