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__bad_area_nosemaphore() currently checks the X86_PF_USER bit in the error code to decide whether to send a signal or to treat the fault as a kernel error. This can cause somewhat erratic behavior. The straightforward cases where the CPL agrees with the hardware USER bit are all correct, but the other cases are confusing. - A user instruction accessing a kernel address with supervisor privilege (e.g. a descriptor table access failed). The USER bit will be clear, and we OOPS. This is correct, because it indicates a kernel bug, not a user error. - A user instruction accessing a user address with supervisor privilege (e.g. a descriptor table was incorrectly pointing at user memory). __bad_area_nosemaphore() will be passed a modified error code with the user bit set, and we will send a signal. Sending the signal will work (because the regs and the entry frame genuinely come from user mode), but we really ought to OOPS, as this event indicates a severe kernel bug. - A kernel instruction with user privilege (i.e. WRUSS). This should OOPS or get fixed up. The current code would instead try send a signal and malfunction. Change the logic: a signal should be sent if the faulting context is user mode *and* the access has user privilege. Otherwise it's either a kernel mode fault or a failed implicit access, either of which should end up in no_context(). Note to -stable maintainers: don't backport this unless you backport CET. The bug it fixes is unobservable in current kernels unless something is extremely wrong. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Yu-cheng Yu <yu-cheng.yu@intel.com> Link: http://lkml.kernel.org/r/10e509c43893170e262e82027ea399130ae81159.1542667307.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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.