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efb07ac534
The arm64 probe simulation doesn't currently have logic in place to deal with GCS and this results in core dumps if probes are inserted at control flow locations. Fix-up bl, blr and ret to manipulate the shadow stack as needed. While we manipulate and validate the shadow stack correctly, the hardware provides additional security by only allowing GCS operations against pages which are marked to support GCS. For writing there is gcssttr() which enforces this, but there isn't an equivalent for reading. This means that uprobe users should be aware that probing on control flow instructions which require reading the shadow stack (ex: ret) offers lower security guarantees than what is achieved without the uprobe active. Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@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 reStructuredText 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.