patches/kernel/0141-x86-irq-64-Print-the-offending-IP-in-the-stack-overf.patch

   1 From 3c131c80b6a5a95ab9a24e444ef02eba38710840 Mon Sep 17 00:00:00 2001
   2 From: Andy Lutomirski <luto@kernel.org>
   3 Date: Mon, 4 Dec 2017 15:07:11 +0100
   4 Subject: [PATCH 141/241] x86/irq/64: Print the offending IP in the stack
   5  overflow warning
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 CVE-2017-5754
  11
  12 In case something goes wrong with unwind (not unlikely in case of
  13 overflow), print the offending IP where we detected the overflow.
  14
  15 Signed-off-by: Andy Lutomirski <luto@kernel.org>
  16 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  17 Reviewed-by: Borislav Petkov <bp@suse.de>
  18 Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
  19 Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
  20 Cc: Borislav Petkov <bp@alien8.de>
  21 Cc: Borislav Petkov <bpetkov@suse.de>
  22 Cc: Brian Gerst <brgerst@gmail.com>
  23 Cc: Dave Hansen <dave.hansen@intel.com>
  24 Cc: Dave Hansen <dave.hansen@linux.intel.com>
  25 Cc: David Laight <David.Laight@aculab.com>
  26 Cc: Denys Vlasenko <dvlasenk@redhat.com>
  27 Cc: Eduardo Valentin <eduval@amazon.com>
  28 Cc: Greg KH <gregkh@linuxfoundation.org>
  29 Cc: H. Peter Anvin <hpa@zytor.com>
  30 Cc: Josh Poimboeuf <jpoimboe@redhat.com>
  31 Cc: Juergen Gross <jgross@suse.com>
  32 Cc: Linus Torvalds <torvalds@linux-foundation.org>
  33 Cc: Peter Zijlstra <peterz@infradead.org>
  34 Cc: Rik van Riel <riel@redhat.com>
  35 Cc: Will Deacon <will.deacon@arm.com>
  36 Cc: aliguori@amazon.com
  37 Cc: daniel.gruss@iaik.tugraz.at
  38 Cc: hughd@google.com
  39 Cc: keescook@google.com
  40 Link: https://lkml.kernel.org/r/20171204150605.231677119@linutronix.de
  41 Signed-off-by: Ingo Molnar <mingo@kernel.org>
  42 (cherry picked from commit 4f3789e792296e21405f708cf3cb409d7c7d5683)
  43 Signed-off-by: Andy Whitcroft <apw@canonical.com>
  44 Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
  45 (cherry picked from commit aa820446b0d31df0870b176257b40baadaf4444c)
  46 Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
  47 ---
  48  arch/x86/kernel/irq_64.c | 4 ++--
  49  1 file changed, 2 insertions(+), 2 deletions(-)
  50
  51 diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
  52 index 3be74fbdeff2..feca14980e32 100644
  53 --- a/arch/x86/kernel/irq_64.c
  54 +++ b/arch/x86/kernel/irq_64.c
  55 @@ -56,10 +56,10 @@ static inline void stack_overflow_check(struct pt_regs *regs)
  56         if (regs->sp >= estack_top && regs->sp <= estack_bottom)
  57                 return;
  58
  59 -       WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx)\n",
  60 +       WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx,ip:%pF)\n",
  61                 current->comm, curbase, regs->sp,
  62                 irq_stack_top, irq_stack_bottom,
  63 -               estack_top, estack_bottom);
  64 +               estack_top, estack_bottom, (void *)regs->ip);
  65
  66         if (sysctl_panic_on_stackoverflow)
  67                 panic("low stack detected by irq handler - check messages\n");
  68 --
  69 2.14.2
  70