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  1. 10 May, 2017 8 commits
  3. 24 Apr, 2017 1 commit
    • Pavel Emelyanov's avatar
      criu: Version 3.0 · fce87893
      Pavel Emelyanov authored 
      So, we've done a HUUGE rework in this release, that's why it's 3.0.
Two biggest changes are:

* Compel library -- the framwork for parasite code injection.
* 32bit x86 support. Note, that it's neither x32 support, not 32-bit
  criu. It's purely the ability to dump 32-bit tasks on 64-bit host.

With compel at hands the 'criu exec' is removed.

Main set of kudos go to Cyrill and Dima for this heavy lifting :)

Other things include shutdown-ed UDP sockets, bind-mounts to external
bind mounts, ASAN, extentions to RPC, rework of SysVIPC shmem dump
format and some bugfixes and beautifications in CRIT.
Signed-off-by: 's avatarPavel Emelyanov <xemul@virtuozzo.com>
      fce87893
  5. 20 Apr, 2017 3 commits
  7. 17 Apr, 2017 5 commits
    • Dmitry Safonov's avatar
      arm: Workaround shmat() page coloring alignment · e98d16e7
      Dmitry Safonov authored 
      Please, see incode comment about the issue.
There was an attempt to fix this feature in kernel:
  http://www.spinics.net/lists/arm-kernel/msg258870.html

I'll send a patch for kernel with a correct justification.
Still it's worth to workaround this on older kernels.
mremap() after shmat() makes it possible to C/R shmem between ARMv7 CPUs.
Without it C/R will fail even on the same platform.

That is possible that this workaround changes *restore failure* to
*corruption* in shared memory after restore.
Still, I think it's worth to be applied by the following reasons:
1. All ARMv7 CPUs do not have VIPT aliasing data cache.
   And ARMv6 CPUs may have any, but they are not popular because of UMP.
2. SysV IPC shmem should be writable and SHMLBA unaligned
   (if it's only readable, then it's OK).
3. For the data corruption we need to migrate from non-VIPT cached CPUs
   to VIPT aliasing.
4. As this is shmem migration between platforms - quite likely we have
   it`s copy (in case of whole IPC namespace dump - in images).
5. C/R before on the same CPU may fail (quite likely, more than 50% of
   zdtm/transition/ipc failed while I've test it).

So, I think it's very unlikely that someone uses CRIU to migrate
from ARMv7 to ARMv6 unaligned writable shmem, but if he is - here is
a BIG WARNING on restore.

And after all: we've restored application as it was on checkpoint,
we can't reliably tell that shmem needs align on the target platform,
but we warned on restoring.

I wanted to test the cpuid for VIPT caching firstly, but it's in cp15
coprocessor, which means it's unavailable from userspace. Only one
reliable way to tell is to check couple of first boot lines in dmesg:
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Signed-off-by: 's avatarDmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: 's avatarAndrei Vagin <avagin@virtuozzo.com>
      e98d16e7
    • Dmitry Safonov's avatar
      arm32/Makefile: fix readable mappings getting +x · d7c86c8b
      Dmitry Safonov authored 
      Flag `noexecstack' for ld implies `EXSTACK_DISABLE_X' ELF flag
on CRIU binary. Without this flag the kernel ELF loader will set
`READ_IMPLIES_EXEC' personality bit:
>	if (elf_read_implies_exec(loc->elf_ex, executable_stack))
>		current->personality |= READ_IMPLIES_EXEC;

This flag is checked by sys_mmap():
>	if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC))
>		if (!(file && path_noexec(&file->f_path)))
>			prot |= PROT_EXEC;

Which results in each mmap() syscall returning +x mapping for any
readable mapping for CRIU binary, e.g:
Before C/R:
76fc4000-76fc5000 r--p 0001f000 b3:02 131656     /usr/lib/ld-2.25.so
76fc5000-76fc6000 rw-p 00020000 b3:02 131656     /usr/lib/ld-2.25.so
After restore:
76fc4000-76fc5000 r-xp 0001f000 b3:02 131656     /usr/lib/ld-2.25.so
76fc5000-76fc6000 rwxp 00020000 b3:02 131656     /usr/lib/ld-2.25.so

Which also makes ZDTM very sad:
1: Old maps lost: set(["76f80000-76f81000 ['rw-p', '0120400']", "25000-26000
['rw-p', '0120400']", "76f7d000-76f7f000 ['rw-p']", "14a8000-14c9000 ['rw-p']",
"76f4a000-76f4c000 ['r--p', '0120400']", "7ed3d000-7ed7f000 ['rw-p']",
"76f7f000-76f80000 ['r--p', '0120400']", "24000-25000 ['r--p', '0120400']",
"76f4c000-76f50000 ['rw-p', '0120400']"])
1: New maps appeared: set(["76f7f000-76f80000 ['r-xp', '0120400']",
"7ed3d000-7ed7f000 ['rwxp']", "76f4a000-76f4c000 ['r-xp', '0120400']",
"76f80000-76f81000 ['rwxp', '0120400']", "24000-25000 ['r-xp', '0120400']",
"14a8000-14c9000 ['rwxp']", "25000-26000 ['rwxp', '0120400']",
"76f7d000-76f7f000 ['rwxp']", "76f4c000-76f50000 ['rwxp', '0120400']"])

Maybe we also need to set it for arm64 or even for all archs, but that
needs to be tested in the first place, so add it now to arm32, x86
already has it.
Acked-by: 's avatarCyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: 's avatarDmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: 's avatarAndrei Vagin <avagin@virtuozzo.com>
      d7c86c8b
    • Dmitry Safonov's avatar
      python: specify python2 as .py interpreter · 057c3f29
      Dmitry Safonov authored 
      On some distro the default python interpreter is Python 3,
which results in such errors:
>  Running zdtm/static/socket-tcp-closed.hook(--post-start)
>  make[1]: Nothing to be done for default.
>  ./socket-tcp-closed --pidfile=socket-tcp-closed.pid --outfile=socket-tcp-closed.out
>    File "zdtm/static/socket-tcp-closed.hook", line 16
>      except OSError, e:
>                    ^
>  SyntaxError: invalid syntax
>  ######### Test zdtm/static/socket-tcp-closed FAIL at hook --post-start #########
>  Running zdtm/static/socket-tcp-closed.hook(--clean)
>    File "zdtm/static/socket-tcp-closed.hook", line 16
>      except OSError, e:
>                    ^
>  SyntaxError: invalid syntax
>  Traceback (most recent call last):
>    File "zdtm.py", line 1921, in <module>
>      do_run_test(tinfo[0], tinfo[1], tinfo[2], tinfo[3])
>    File "zdtm.py", line 1388, in do_run_test
>      try_run_hook(t, ["--clean"])
>    File "zdtm.py", line 1053, in try_run_hook
>      raise test_fail_exc("hook " + " ".join(args))
>  __main__.test_fail_exc: <__main__.test_fail_exc instance at 0x76294468>
Acked-by: 's avatarCyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: 's avatarDmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: 's avatarAndrei Vagin <avagin@virtuozzo.com>
      057c3f29
    • Dmitry Safonov's avatar
      arm/compel: add generated headers to .gitignore · 692da148
      Dmitry Safonov authored 
      [criu]# git status -s
?? compel/arch/arm/plugins/std/syscalls/syscalls.S
?? compel/plugins/include/uapi/std/syscall-aux.S
?? compel/plugins/include/uapi/std/syscall-aux.h
Acked-by: 's avatarCyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: 's avatarDmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: 's avatarAndrei Vagin <avagin@virtuozzo.com>
      692da148
    • Dmitry Safonov's avatar
      test/maps01: document mmap() failures · ab33ae2d
      Dmitry Safonov authored 
      Arm32 devices often have poor amount of RAM. E.g., RPI2 board
has only 1Gb memory. This lead to failures with maps01 test,
which tries to mmap() 1Gb of memory. The failures of test is
not very evident - let's document mmap() errors here to
blow some light on the situation.
Acked-by: 's avatarCyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: 's avatarDmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: 's avatarAndrei Vagin <avagin@virtuozzo.com>
      ab33ae2d
  9. 11 Apr, 2017 18 commits
  11. 02 Apr, 2017 5 commits