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367e3f1d3f
Spurious faults only ever occur in the kernel's address space. They are also constrained specifically to faults with one of these error codes: X86_PF_WRITE | X86_PF_PROT X86_PF_INSTR | X86_PF_PROT So, it's never even possible to reach spurious_kernel_fault_check() with X86_PF_PK set. In addition, the kernel's address space never has pages with user-mode protections. Protection Keys are only enforced on pages with user-mode protection. This gives us lots of reasons to not check for protection keys in our sprurious kernel fault handling. But, let's also add some warnings to ensure that these assumptions about protection keys hold true. Cc: x86@kernel.org Cc: Jann Horn <jannh@google.com> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180928160231.243A0D6A@viggo.jf.intel.com |
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.