• Dave Hansen's avatar
    x86/signals: Add missing signal_compat code for x86 features · a4455082
    Dave Hansen authored
    
    
    The 32-bit siginfo is a different binary format than the 64-bit
    one.  So, when running 32-bit binaries on 64-bit kernels, we have
    to convert the kernel's 64-bit version to a 32-bit version that
    userspace can grok.
    
    We've added a few features to siginfo over the past few years and
    neglected to add them to arch/x86/kernel/signal_compat.c:
    
       1. The si_addr_lsb used in SIGBUS's sent for machine checks
       2. The upper/lower bounds for MPX SIGSEGV faults
       3. The protection key for pkey faults
    
    I caught this with some protection keys unit tests and realized
    it affected a few more features.
    
    This was tested only with my protection keys patch that looks
    for a proper value in si_pkey.  I didn't actually test the machine
    check or MPX code.
    Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Dave Hansen <dave@sr71.net>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: linux-edac@vger.kernel.org
    Link: http://lkml.kernel.org/r/20160608172533.F8F05637@viggo.jf.intel.com
    
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    a4455082