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d82a0345cf
The fully secure mitigation for RSB underflow on Intel SKL CPUs is IBRS, which inflicts up to 30% penalty for pathological syscall heavy work loads. Software based call depth tracking and RSB refill is not perfect, but reduces the attack surface massively. The penalty for the pathological case is about 8% which is still annoying but definitely more palatable than IBRS. Add a retbleed=stuff command line option to enable the call depth tracking and software refill of the RSB. This gives admins a choice. IBeeRS are safe and cause headaches, call depth tracking is considered to be s(t)ufficiently safe. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20220915111149.029587352@infradead.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.