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[Qemu-devel] [Bug 1837094] [NEW] UndefinedBehaviorSanitizer crash around


From: Philippe Mathieu-Daudé
Subject: [Qemu-devel] [Bug 1837094] [NEW] UndefinedBehaviorSanitizer crash around slirp::ip_reass()
Date: Thu, 18 Jul 2019 17:47:39 -0000

Public bug reported:

tag: v4.1.0-rc1

./configure --enable-sanitizers --extra-cflags=-O1

==26130==ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address 
0x000000000008 (pc 0x00000046d588 bp 0x7fff6ee9f940 sp 0x7fff6ee9f8e8 T26130)
==26130==The signal is caused by a WRITE memory access.
==26130==Hint: address points to the zero page.
    #0 0x0000561ad346d587 in ip_deq() at slirp/src/ip_input.c:411:55
    #1 0x0000561ad346cffb in ip_reass() at slirp/src/ip_input.c:304:9
    #2 0x0000561ad346cb6f in ip_input() at slirp/src/ip_input.c:184:18

I only had access to the last packet which isn't the culprit, I'm now
seeing how to log the network traffic of the guest to provide more
useful information.

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: slirp

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https://bugs.launchpad.net/bugs/1837094

Title:
  UndefinedBehaviorSanitizer crash around slirp::ip_reass()

Status in QEMU:
  New

Bug description:
  tag: v4.1.0-rc1

  ./configure --enable-sanitizers --extra-cflags=-O1

  ==26130==ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address 
0x000000000008 (pc 0x00000046d588 bp 0x7fff6ee9f940 sp 0x7fff6ee9f8e8 T26130)
  ==26130==The signal is caused by a WRITE memory access.
  ==26130==Hint: address points to the zero page.
      #0 0x0000561ad346d587 in ip_deq() at slirp/src/ip_input.c:411:55
      #1 0x0000561ad346cffb in ip_reass() at slirp/src/ip_input.c:304:9
      #2 0x0000561ad346cb6f in ip_input() at slirp/src/ip_input.c:184:18

  I only had access to the last packet which isn't the culprit, I'm now
  seeing how to log the network traffic of the guest to provide more
  useful information.

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