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61d9c412d0
Capture ctxt->regs_dirty in a local 'unsigned long' instead of casting it to an 'unsigned long *' for use in for_each_set_bit(). The bitops helpers really do read the entire 'unsigned long', even though the walking of the read value is capped at the specified size. I.e. 64-bit KVM is reading memory beyond ctxt->regs_dirty, which is a u32 and thus 4 bytes, whereas an unsigned long is 8 bytes. Functionally it's not an issue because regs_dirty is in the middle of x86_emulate_ctxt, i.e. KVM is just reading its own memory, but relying on that coincidence is gross and unsafe. Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220526210817.3428868-2-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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.