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  1. 30 Oct, 2013 2 commits
    • Pavel Emelyanov's avatar
      parasite: Introduce thread_ctx structure · c8fe0e5e
      Pavel Emelyanov authored 
      This one keeps registers and sigmask for running thread. Will
be used for simpler parasite management.
Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      c8fe0e5e
    • Cyrill Gorcunov's avatar
      restore: Don't unmap vdso proxy on final cleanup · 0707df77
      Cyrill Gorcunov authored 
      In case if we need to use vdso proxy the memory area
which holds restorer also has a place for vdso proxy
code itself, so on final pass we should not unmap it,
otherwise any call to vdso function will cause sigsegv.

IOW, the memory before final "cleanup" pass of restorer
might look as

    +-----------+---------+     +-------------+------+
    | bootstrap | rt-vdso | ... | application | vdso |
    +-----------+---------+     +-------------+------+
                       ^                         |
                       `-------------------------+

and we have redirected "vdso" code to jump to "rt-vdso".
After final pass the memory must look as

                +---------+     +-------------+------+
                | rt-vdso | ... | application | vdso |
                +---------+     +-------------+------+
                       ^                         |
                       `-------------------------+

I noticed this problem during container migration
testing, the container itself was suspended on 2.6.32
OpenVZ kernel with apache running inside, and any attempt
to connect to apache caused apache to crash.
Signed-off-by: 's avatarCyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      0707df77
  3. 29 Oct, 2013 6 commits
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  17. 10 Oct, 2013 6 commits