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Linus Torvalds 70442fc54e * Detect insecure W+X mappings and warn about them, including a
few bug fixes and relaxing the enforcement
  * Do a long-overdue defconfig update and enabling W+X boot-time
    detection
  * Cleanup _PAGE_PSE handling (follow-up on an earlier bug)
  * Rename a change_page_attr function
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Merge tag 'x86_mm_for_v6.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 mm updates from Dave Hansen:
 "There are some small things here, plus one big one.

  The big one detected and refused to create W+X kernel mappings. This
  caused a bit of trouble and it is entirely disabled on 32-bit due to
  known unfixable EFI issues. It also oopsed on some systemd eBPF use,
  which kept some users from booting.

  The eBPF issue is fixed, but those troubles were caught relatively
  recently which made me nervous that there are more lurking. The final
  commit in here retains the warnings, but doesn't actually refuse to
  create W+X mappings.

  Summary:

   - Detect insecure W+X mappings and warn about them, including a few
     bug fixes and relaxing the enforcement

   - Do a long-overdue defconfig update and enabling W+X boot-time
     detection

   - Cleanup _PAGE_PSE handling (follow-up on an earlier bug)

   - Rename a change_page_attr function"

* tag 'x86_mm_for_v6.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Ease W^X enforcement back to just a warning
  x86/mm: Disable W^X detection and enforcement on 32-bit
  x86/mm: Add prot_sethuge() helper to abstract out _PAGE_PSE handling
  x86/mm/32: Fix W^X detection when page tables do not support NX
  x86/defconfig: Enable CONFIG_DEBUG_WX=y
  x86/defconfig: Refresh the defconfigs
  x86/mm: Refuse W^X violations
  x86/mm: Rename set_memory_present() to set_memory_p()
History 2022-10-10 17:13:07 -07:00
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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.