debian/patches/old/CVE-2015-7549-msix-pba-write-ro.patch

   1 commit 43b11a91dd861a946b231b89b7542856ade23d1b
   2 Author: Marc-André Lureau <marcandre.lureau@redhat.com>
   3 Date:   Fri Jun 26 14:25:29 2015 +0200
   4
   5     msix: implement pba write (but read-only)
   6
   7     qpci_msix_pending() writes on pba region, causing qemu to SEGV:
   8
   9       Program received signal SIGSEGV, Segmentation fault.
  10       [Switching to Thread 0x7ffff7fba8c0 (LWP 25882)]
  11       0x0000000000000000 in ?? ()
  12       (gdb) bt
  13       #0  0x0000000000000000 in  ()
  14       #1  0x00005555556556c5 in memory_region_oldmmio_write_accessor (mr=0x5555579f3f80, addr=0, value=0x7fffffffbf68, size=4, shift=0, mask=4294967295, attrs=...) at /home/elmarco/src/qemu/memory.c:434
  15       #2  0x00005555556558e1 in access_with_adjusted_size (addr=0, value=0x7fffffffbf68, size=4, access_size_min=1, access_size_max=4, access=0x55555565563e <memory_region_oldmmio_write_accessor>, mr=0x5555579f3f80, attrs=...) at /home/elmarco/src/qemu/memory.c:506
  16       #3  0x00005555556581eb in memory_region_dispatch_write (mr=0x5555579f3f80, addr=0, data=0, size=4, attrs=...) at /home/elmarco/src/qemu/memory.c:1176
  17       #4  0x000055555560b6f9 in address_space_rw (as=0x555555eff4e0 <address_space_memory>, addr=3759147008, attrs=..., buf=0x7fffffffc1b0 "", len=4, is_write=true) at /home/elmarco/src/qemu/exec.c:2439
  18       #5  0x000055555560baa2 in cpu_physical_memory_rw (addr=3759147008, buf=0x7fffffffc1b0 "", len=4, is_write=1) at /home/elmarco/src/qemu/exec.c:2534
  19       #6  0x000055555564c005 in cpu_physical_memory_write (addr=3759147008, buf=0x7fffffffc1b0, len=4) at /home/elmarco/src/qemu/include/exec/cpu-common.h:80
  20       #7  0x000055555564cd9c in qtest_process_command (chr=0x55555642b890, words=0x5555578de4b0) at /home/elmarco/src/qemu/qtest.c:378
  21       #8  0x000055555564db77 in qtest_process_inbuf (chr=0x55555642b890, inbuf=0x55555641b340) at /home/elmarco/src/qemu/qtest.c:569
  22       #9  0x000055555564dc07 in qtest_read (opaque=0x55555642b890, buf=0x7fffffffc2e0 "writel 0xe0100800 0x0\n", size=22) at /home/elmarco/src/qemu/qtest.c:581
  23       #10 0x000055555574ce3e in qemu_chr_be_write (s=0x55555642b890, buf=0x7fffffffc2e0 "writel 0xe0100800 0x0\n", len=22) at qemu-char.c:306
  24       #11 0x0000555555751263 in tcp_chr_read (chan=0x55555642bcf0, cond=G_IO_IN, opaque=0x55555642b890) at qemu-char.c:2876
  25       #12 0x00007ffff64c9a8a in g_main_context_dispatch (context=0x55555641c400) at gmain.c:3122
  26
  27     (without this patch, this can be reproduced with the ivshmem qtest)
  28
  29     Implement an empty mmio write to avoid the crash.
  30
  31     Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
  32     Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
  33
  34 diff --git a/hw/pci/msix.c b/hw/pci/msix.c
  35 index 2fdada4..64c93d8 100644
  36 --- a/hw/pci/msix.c
  37 +++ b/hw/pci/msix.c
  38 @@ -200,8 +200,14 @@ static uint64_t msix_pba_mmio_read(void *opaque, hwaddr addr,
  39      return pci_get_long(dev->msix_pba + addr);
  40  }
  41
  42 +static void msix_pba_mmio_write(void *opaque, hwaddr addr,
  43 +                                uint64_t val, unsigned size)
  44 +{
  45 +}
  46 +
  47  static const MemoryRegionOps msix_pba_mmio_ops = {
  48      .read = msix_pba_mmio_read,
  49 +    .write = msix_pba_mmio_write,
  50      .endianness = DEVICE_LITTLE_ENDIAN,
  51      .valid = {
  52          .min_access_size = 4,