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135d2d65f2
[ Upstream commit 13f9bae579c6bd051e58f326913dd09af1291208 ] Currently if the kernel is built with CONFIG_TRACE_IRQFLAGS and KASAN and used as crash kernel it crashes itself due to trace_hardirqs_off/trace_hardirqs_on being called with DAT off. This happens because trace_hardirqs_off/trace_hardirqs_on are instrumented and kasan code tries to perform access to shadow memory to validate memory accesses. Kasan shadow memory is populated with vmemmap, so all accesses require DAT on. memcpy_real could be called with DAT on or off (with kasan enabled DAT is set even before early code is executed). Make sure that trace_hardirqs_off/trace_hardirqs_on are called with DAT on and only actual __memcpy_real is called with DAT off. Also annotate __memcpy_real and _memcpy_real with __no_sanitize_address to avoid further problems due to switching DAT off. Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.