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[Xen-devel] [qemu-upstream-4.4-testing test] 93978: regressions - FAIL

flight 93978 qemu-upstream-4.4-testing real [real]

Regressions :-(

Tests which did not succeed and are blocking,
including tests which could not be run:
 test-amd64-amd64-pv          17 guest-localmigrate/x10    fail REGR. vs. 83041

Regressions which are regarded as allowable (not blocking):
 test-amd64-i386-xl-qemuu-winxpsp3-vcpus1 13 guest-localmigrate fail REGR. vs. 
 test-amd64-i386-xl-qemuu-win7-amd64 16 guest-stop              fail like 83041

Tests which did not succeed, but are not blocking:
 test-amd64-amd64-qemuu-nested-intel 16 debian-hvm-install/l1/l2 fail never pass
 test-amd64-amd64-qemuu-nested-amd 16 debian-hvm-install/l1/l2  fail never pass
 test-amd64-amd64-libvirt     12 migrate-support-check        fail   never pass
 test-amd64-i386-libvirt      12 migrate-support-check        fail   never pass
 test-amd64-amd64-libvirt-vhd 11 migrate-support-check        fail   never pass

version targeted for testing:
 qemuu                a2fd7eba04d4c69e4ee18a43eb6cf32aaffb3c98
baseline version:
 qemuu                16169ab825a03262cd66382dc0b02caa0dbd636a

Last test of basis    83041  2016-02-18 17:58:50 Z   82 days
Testing same since    93978  2016-05-10 11:10:44 Z    0 days    1 attempts

People who touched revisions under test:
  Gerd Hoffmann <kraxel@xxxxxxxxxx>
  Stefano Stabellini <sstabellini@xxxxxxxxxx>

 build-amd64-xend                                             pass    
 build-i386-xend                                              pass    
 build-amd64                                                  pass    
 build-i386                                                   pass    
 build-amd64-libvirt                                          pass    
 build-i386-libvirt                                           pass    
 build-amd64-pvops                                            pass    
 build-i386-pvops                                             pass    
 test-amd64-amd64-xl                                          pass    
 test-amd64-i386-xl                                           pass    
 test-amd64-amd64-qemuu-nested-amd                            fail    
 test-amd64-i386-qemuu-rhel6hvm-amd                           pass    
 test-amd64-amd64-xl-qemuu-debianhvm-amd64                    pass    
 test-amd64-i386-xl-qemuu-debianhvm-amd64                     pass    
 test-amd64-i386-freebsd10-amd64                              pass    
 test-amd64-amd64-xl-qemuu-ovmf-amd64                         pass    
 test-amd64-i386-xl-qemuu-ovmf-amd64                          pass    
 test-amd64-amd64-xl-qemuu-win7-amd64                         pass    
 test-amd64-i386-xl-qemuu-win7-amd64                          fail    
 test-amd64-amd64-xl-credit2                                  pass    
 test-amd64-i386-freebsd10-i386                               pass    
 test-amd64-amd64-qemuu-nested-intel                          fail    
 test-amd64-i386-qemuu-rhel6hvm-intel                         pass    
 test-amd64-amd64-libvirt                                     pass    
 test-amd64-i386-libvirt                                      pass    
 test-amd64-amd64-xl-multivcpu                                pass    
 test-amd64-amd64-pair                                        pass    
 test-amd64-i386-pair                                         pass    
 test-amd64-amd64-libvirt-pair                                pass    
 test-amd64-i386-libvirt-pair                                 pass    
 test-amd64-amd64-pv                                          fail    
 test-amd64-i386-pv                                           pass    
 test-amd64-amd64-amd64-pvgrub                                pass    
 test-amd64-amd64-i386-pvgrub                                 pass    
 test-amd64-amd64-pygrub                                      pass    
 test-amd64-amd64-xl-qcow2                                    pass    
 test-amd64-i386-xl-raw                                       pass    
 test-amd64-i386-xl-qemuu-winxpsp3-vcpus1                     fail    
 test-amd64-amd64-libvirt-vhd                                 pass    
 test-amd64-amd64-xl-qemuu-winxpsp3                           pass    

sg-report-flight on osstest.test-lab.xenproject.org
logs: /home/logs/logs
images: /home/logs/images

Logs, config files, etc. are available at

Explanation of these reports, and of osstest in general, is at

Test harness code can be found at

Not pushing.

commit a2fd7eba04d4c69e4ee18a43eb6cf32aaffb3c98
Author: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date:   Tue Apr 26 14:48:06 2016 +0200

    vga: make sure vga register setup for vbe stays intact (CVE-2016-3712).
    Call vbe_update_vgaregs() when the guest touches GFX, SEQ or CRT
    registers, to make sure the vga registers will always have the
    values needed by vbe mode.  This makes sure the sanity checks
    applied by vbe_fixup_regs() are effective.
    Without this guests can muck with shift_control, can turn on planar
    vga modes or text mode emulation while VBE is active, making qemu
    take code paths meant for CGA compatibility, but with the very
    large display widths and heigts settable using VBE registers.
    Which is good for one or another buffer overflow.  Not that
    critical as they typically read overflows happening somewhere
    in the display code.  So guests can DoS by crashing qemu with a
    segfault, but it is probably not possible to break out of the VM.
    upstream-commit-id: fd3c136b3e1482cd0ec7285d6bc2a3e6a62c38d7
    Fixes: CVE-2016-3712
    Reported-by: Zuozhi Fzz <zuozhi.fzz@xxxxxxxxxxxxxxx>
    Reported-by: P J P <ppandit@xxxxxxxxxx>
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
    Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

commit af973cb46a7883d102d53bcf8cf96f7ec1a3eaf4
Author: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date:   Tue Apr 26 15:39:22 2016 +0200

    vga: update vga register setup on vbe changes
    Call the new vbe_update_vgaregs() function on vbe configuration
    changes, to make sure vga registers are up-to-date.
    upstream-commit-id: 2068192dcccd8a80dddfcc8df6164cf9c26e0fc4
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
    Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

commit eb3b47943a27152b0ff62a6a8736648304139029
Author: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date:   Tue Apr 26 15:24:18 2016 +0200

    vga: factor out vga register setup
    When enabling vbe mode qemu will setup a bunch of vga registers to make
    sure the vga emulation operates in correct mode for a linear
    framebuffer.  Move that code to a separate function so we can call it
    from other places too.
    upstream-commit-id: 7fa5c2c5dc9f9bf878c1e8669eb9644d70a71e71
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
    Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

commit 915674299f076729dd4f392b907fa6e59377dcf2
Author: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date:   Tue Apr 26 14:11:34 2016 +0200

    vga: add vbe_enabled() helper
    Makes code a bit easier to read.
    upstream-commit-id: bfa0f151a564a83b5a26f3e917da98674bf3cf62
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
    Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

commit f5491c3d32f417a65fc15c241705fc0e00834bca
Author: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date:   Tue Apr 26 08:49:10 2016 +0200

    vga: fix banked access bounds checking (CVE-2016-3710)
    vga allows banked access to video memory using the window at 0xa00000
    and it supports a different access modes with different address
    The VBE bochs extentions support banked access too, using the
    VBE_DISPI_INDEX_BANK register.  The code tries to take the different
    address calculations into account and applies different limits to
    VBE_DISPI_INDEX_BANK depending on the current access mode.
    Which is probably effective in stopping misprogramming by accident.
    But from a security point of view completely useless as an attacker
    can easily change access modes after setting the bank register.
    Drop the bogus check, add range checks to vga_mem_{readb,writeb}
    upstream-commit-id: 3bf1817079bb0d80c0d8a86a7c7dd0bfe90eb82e
    Fixes: CVE-2016-3710
    Reported-by: Qinghao Tang <luodalongde@xxxxxxxxx>
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
    Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

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