Alban Crequy
db744288af
commit8678ea0685upstream. If a page fault occurs while copying the first byte, this function resets one byte before dst. As a consequence, an address could be modified and leaded to kernel crashes if case the modified address was accessed later. Fixes:b58294ead1("maccess: allow architectures to provide kernel probing directly") Signed-off-by: Alban Crequy <albancrequy@linux.microsoft.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Tested-by: Francis Laniel <flaniel@linux.microsoft.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: <stable@vger.kernel.org> [5.8] Link: https://lore.kernel.org/bpf/20221110085614.111213-2-albancrequy@linux.microsoft.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.