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commit4a5cb51f3dupstream. The check_return_regs_valid() can cause a false positive if the return regs are marked as norestart and they are an HSRR type interrupt, because the low bit in the bottom of regs->trap causes interrupt type matching to fail. This can occcur for example on bare metal with a HV privileged doorbell interrupt that causes a signal, but do_signal returns early because get_signal() fails, and takes the "No signal to deliver" path. In this case no signal was delivered so the return location is not changed so return SRRs are not invalidated, yet set_trap_norestart is called, which messes up the match. Building go-1.16.6 is known to reproduce this. Fix it by using the TRAP() accessor which masks out the low bit. Fixes:6eaaf9de35("powerpc/64s/interrupt: Check and fix srr_valid without crashing") Cc: stable@vger.kernel.org # v5.14+ Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211026122531.3599918-1-npiggin@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.