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[Qemu-devel] [Bug 1728639] Re: qemu-io crashes with SIGSEGV when did -c


From: Max Reitz
Subject: [Qemu-devel] [Bug 1728639] Re: qemu-io crashes with SIGSEGV when did -c truncate 320000 on a image_fuzzer image
Date: Thu, 02 Nov 2017 21:14:43 -0000

Hi,

Thanks a lot for reporting this bug!  I've found a fix and I'll send a
patch once I've written a test case.

Max

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https://bugs.launchpad.net/bugs/1728639

Title:
  qemu-io crashes with SIGSEGV when did  -c truncate 320000 on a
  image_fuzzer image

Status in QEMU:
  New

Bug description:
  git is at HEAD a93ece47fd9edbd4558db24300056c9a57d3bcd4
  This is on ppc64le architecture.

  Re-production steps:

  1. Copy the attached files named test.img to a directory
  2. And customize the following command to point to the above directory and 
run the same.
  # mv test.img copy.img
  # qemu-io <path to>/copy.img -c "truncate 320000"

  from gdb:
  Program terminated with signal 11, Segmentation fault.
  #0  0x000000001000e444 in refresh_total_sectors (bs=0x1fe86f60, hint=11648) 
at block.c:723
  723       if (drv->bdrv_getlength) {
  Missing separate debuginfos, use: debuginfo-install 
cyrus-sasl-lib-2.1.26-21.el7.ppc64le glib2-2.50.3-3.el7.ppc64le 
glibc-2.17-196.el7.ppc64le gmp-6.0.0-15.el7.ppc64le gnutls-3.3.26-9.el7.ppc64le 
keyutils-libs-1.5.8-3.el7.ppc64le krb5-libs-1.15.1-8.el7.ppc64le 
libaio-0.3.109-13.el7.ppc64le libcom_err-1.42.9-10.el7.ppc64le 
libcurl-7.29.0-42.el7.ppc64le libffi-3.0.13-18.el7.ppc64le 
libgcc-4.8.5-16.el7_4.1.ppc64le libidn-1.28-4.el7.ppc64le 
libselinux-2.5-11.el7.ppc64le libssh2-1.4.3-10.el7_2.1.ppc64le 
libstdc++-4.8.5-16.el7_4.1.ppc64le libtasn1-4.10-1.el7.ppc64le 
nettle-2.7.1-8.el7.ppc64le nspr-4.13.1-1.0.el7_3.ppc64le 
nss-3.28.4-15.el7_4.ppc64le nss-softokn-freebl-3.28.3-8.el7_4.ppc64le 
nss-util-3.28.4-3.el7.ppc64le openldap-2.4.44-5.el7.ppc64le 
openssl-libs-1.0.2k-8.el7.ppc64le p11-kit-0.23.5-3.el7.ppc64le 
pcre-8.32-17.el7.ppc64le zlib-1.2.7-17.el7.ppc64le
  (gdb) bt
  #0  0x000000001000e444 in refresh_total_sectors (bs=0x1fe86f60, hint=11648) 
at block.c:723
  #1  0x000000001000fa10 in bdrv_open_driver (bs=0x1fe86f60, drv=0x102036f0 
<bdrv_qcow2>, node_name=0x0, options=0x1fe8c240, open_flags=24578,
      errp=0x3fffea0fc920) at block.c:1153
  #2  0x0000000010010480 in bdrv_open_common (bs=0x1fe86f60, file=0x1fe92540, 
options=0x1fe8c240, errp=0x3fffea0fc920) at block.c:1395
  #3  0x0000000010013ac8 in bdrv_open_inherit (filename=0x3fffea0ff661 
"copy.img", reference=0x0, options=0x1fe8c240, flags=24578, parent=0x0, 
child_role=0x0,
      errp=0x3fffea0fcae0) at block.c:2616
  #4  0x0000000010013e8c in bdrv_open (filename=0x3fffea0ff661 "copy.img", 
reference=0x0, options=0x0, flags=16386, errp=0x3fffea0fcae0) at block.c:2698
  #5  0x000000001008b6d4 in blk_new_open (filename=0x3fffea0ff661 "copy.img", 
reference=0x0, options=0x0, flags=16386, errp=0x3fffea0fcae0)
      at block/block-backend.c:321
  #6  0x000000001000a6ec in openfile (name=0x3fffea0ff661 "copy.img", 
flags=16386, writethrough=true, force_share=false, opts=0x0) at qemu-io.c:81
  #7  0x000000001000c040 in main (argc=4, argv=0x3fffea0fd208) at qemu-io.c:624
  (gdb) bt full
  #0  0x000000001000e444 in refresh_total_sectors (bs=0x1fe86f60, hint=11648) 
at block.c:723
          drv = 0x0
  #1  0x000000001000fa10 in bdrv_open_driver (bs=0x1fe86f60, drv=0x102036f0 
<bdrv_qcow2>, node_name=0x0, options=0x1fe8c240, open_flags=24578,
      errp=0x3fffea0fc920) at block.c:1153
          local_err = 0x0
          ret = 0
          __PRETTY_FUNCTION__ = "bdrv_open_driver"
          __func__ = "bdrv_open_driver"
  #2  0x0000000010010480 in bdrv_open_common (bs=0x1fe86f60, file=0x1fe92540, 
options=0x1fe8c240, errp=0x3fffea0fc920) at block.c:1395
          ret = 16383
          open_flags = 24578
          filename = 0x1fe8e2b1 "copy.img"
          driver_name = 0x1fe54810 "qcow2"
          node_name = 0x0
          discard = 0x0
          detect_zeroes = 0x0
          opts = 0x1fe93100
          drv = 0x102036f0 <bdrv_qcow2>
          local_err = 0x0
          __PRETTY_FUNCTION__ = "bdrv_open_common"
          __func__ = "bdrv_open_common"
  #3  0x0000000010013ac8 in bdrv_open_inherit (filename=0x3fffea0ff661 
"copy.img", reference=0x0, options=0x1fe8c240, flags=24578, parent=0x0, 
child_role=0x0,
      errp=0x3fffea0fcae0) at block.c:2616
          ret = 512
          file = 0x1fe92540
          bs = 0x1fe86f60
          drv = 0x102036f0 <bdrv_qcow2>
          drvname = 0x0
          backing = 0x0
          local_err = 0x0
          snapshot_options = 0x0
          snapshot_flags = 0
          __PRETTY_FUNCTION__ = "bdrv_open_inherit"
          __func__ = "bdrv_open_inherit"
  #4  0x0000000010013e8c in bdrv_open (filename=0x3fffea0ff661 "copy.img", 
reference=0x0, options=0x0, flags=16386, errp=0x3fffea0fcae0) at block.c:2698
  No locals.
  #5  0x000000001008b6d4 in blk_new_open (filename=0x3fffea0ff661 "copy.img", 
reference=0x0, options=0x0, flags=16386, errp=0x3fffea0fcae0)
      at block/block-backend.c:321
          blk = 0x1fe79410
          bs = 0x0
          perm = 3
  #6  0x000000001000a6ec in openfile (name=0x3fffea0ff661 "copy.img", 
flags=16386, writethrough=true, force_share=false, opts=0x0) at qemu-io.c:81
          local_err = 0x0
  #7  0x000000001000c040 in main (argc=4, argv=0x3fffea0fd208) at qemu-io.c:624
          readonly = 0
          sopt = 0x101b2608 "hVc:d:f:rsnCmkt:T:U"
          lopt = {{name = 0x101b26d0 "driver", has_arg = 0, flag = 0x0, val = 
104}, {name = 0x101b26d8 "help", has_arg = 0, flag = 0x0, val = 86}, {
              name = 0x101b26e0 "version", has_arg = 1, flag = 0x0, val = 99}, 
{name = 0x101b26e8 "cmd", has_arg = 1, flag = 0x0, val = 102}, {
              name = 0x101b26f0 "format", has_arg = 0, flag = 0x0, val = 114}, 
{name = 0x101b2700 "y", has_arg = 0, flag = 0x0, val = 115}, {
              name = 0x101b2710 "", has_arg = 0, flag = 0x0, val = 110}, {name 
= 0x101b2718 "nocache", has_arg = 0, flag = 0x0, val = 67}, {
  ---Type <return> to continue, or q <return> to quit---
              name = 0x101b2728 "read", has_arg = 0, flag = 0x0, val = 109}, 
{name = 0x101b2738 "", has_arg = 0, flag = 0x0, val = 107}, {
              name = 0x101b2748 "io", has_arg = 1, flag = 0x0, val = 100}, 
{name = 0x101b2750 "discard", has_arg = 1, flag = 0x0, val = 116}, {
              name = 0x101b2758 "cache", has_arg = 1, flag = 0x0, val = 84}, 
{name = 0x101b25e8 "object", has_arg = 1, flag = 0x0, val = 256}, {
              name = 0x101b2760 "trace", has_arg = 0, flag = 0x0, val = 257}, 
{name = 0x101b1c48 "force-share", has_arg = 0, flag = 0x0, val = 85}, {name = 
0x0,
              has_arg = 0, flag = 0x0, val = 0}}
          c = -1
          opt_index = 0
          flags = 16386
          writethrough = true
          local_error = 0x0
          opts = 0x0
          format = 0x0
          trace_file = 0x0
          force_share = false
  (gdb)
  (gdb) quit

  Will attach image_fuzzer image.

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