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Commit75045f77f7("x86/extable: Introduce _ASM_EXTABLE_UA for uaccess fixups") incorrectly replaced the fixup entry for XSTATE_OP with a user-#PF-only fixup. XRSTOR can also raise #GP if the xstate content is invalid, and _ASM_EXTABLE_UA doesn't expect that. Change this fixup back to _ASM_EXTABLE so that #GP gets fixed up. Fixes:75045f77f7("x86/extable: Introduce _ASM_EXTABLE_UA for uaccess fixups") Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: kernel-hardening@lists.openwall.com Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20181126165957.xhsyu2dhyy45mrjo@linutronix.de Link: https://lkml.kernel.org/r/20181127133200.38322-1-jannh@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.