• Borislav Petkov's avatar
    x86/dumpstack: Add show_stack_regs() and use it · 81c2949f
    Borislav Petkov authored
    Add a helper to dump supplied pt_regs and use it in the MSR exception
    handling code to have precise stack traces pointing to the actual
    function causing the MSR access exception and not the stack frame of the
    exception handler itself.
    
    The new output looks like this:
    
     unchecked MSR access error: RDMSR from 0xdeadbeef at rIP: 0xffffffff8102ddb6 (early_init_intel+0x16/0x3a0)
      00000000756e6547 ffffffff81c03f68 ffffffff81dd0940 ffffffff81c03f10
      ffffffff81d42e65 0000000001000000 ffffffff81c03f58 ffffffff81d3e5a3
      0000800000000000 ffffffff81800080 ffffffffffffffff 0000000000000000
     Call Trace:
      [<ffffffff81d42e65>] early_cpu_init+0xe7/0x136
      [<ffffffff81d3e5a3>] setup_arch+0xa5/0x9df
      [<ffffffff81d38bb9>] start_kernel+0x9f/0x43a
      [<ffffffff81d38294>] x86_64_start_reservations+0x2f/0x31
      [<ffffffff81d383fe>] x86_64_start_kernel+0x168/0x176
    Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
    Reviewed-by: default avatarAndy Lutomirski <luto@kernel.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/1467671487-10344-4-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    81c2949f
extable.c 4.45 KB