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[ Upstream commit bf018ee644897d7982e1b8dd8b15e97db6e1a4da ] Currently unwinder unconditionally returns %r14 from the first frame pointed by %r15 from pt_regs. A task could be interrupted when a function already allocated this frame (if it needs it) for its callees or to store local variables. In that case this frame would contain random values from stack or values stored there by a callee. As we are only interested in %r14 to get potential return address, skip bogus return addresses which doesn't belong to kernel text. This helps to avoid duplicating filtering logic in unwider users, most of which use unwind_get_return_address() and would choke on bogus 0 address returned by it otherwise. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.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.