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Mathias Krause
3376ca3f1a
Commit6abe9c1386("KVM: X86: Move ignore_msrs handling upper the stack") changed the 'ignore_msrs' handling, including sanitizing return values to the caller. This was fine until commit12bc2132b1("KVM: X86: Do the same ignore_msrs check for feature msrs") which allowed non-existing feature MSRs to be ignored, i.e. to not generate an error on the ioctl() level. It even tried to preserve the sanitization of the return value. However, the logic is flawed, as '*data' will be overwritten again with the uninitialized stack value of msr.data. Fix this by simplifying the logic and always initializing msr.data, vanishing the need for an additional error exit path. Fixes:12bc2132b1("KVM: X86: Do the same ignore_msrs check for feature msrs") Signed-off-by: Mathias Krause <minipli@grsecurity.net> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Link: https://lore.kernel.org/r/20240203124522.592778-2-minipli@grsecurity.net Signed-off-by: Sean Christopherson <seanjc@google.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.