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Re: [libvirt] [PATCH] Fix potential deadlock across fork() in QEMU driver

On 02/11/2013 09:12 AM, Daniel P. Berrange wrote:
> From: "Daniel P. Berrange" <berrange redhat com>
> The hook scripts used by virCommand must be careful wrt
> accessing any mutexes that may have been held by other
> threads in the parent process. With the recent refactorigng


> there are 2 potential flaws lurking, which will become real
> deadlock bugs once the global QEMU driver lock is removed.
> Remove use of the QEMU driver lock from the hook function
> by passing in the 'virQEMUDriverConfigPtr' instance directly.
> Add functions to the virSecurityManager to be invoked before
> and after fork, to ensure the mutex is held by the current
> thread. This allows it to be safely used in the hook script
> in the child procss.


> Signed-off-by: Daniel P. Berrange <berrange redhat com>
> ---
>  src/libvirt_private.syms        |  2 ++
>  src/qemu/qemu_process.c         | 16 ++++++++++++----
>  src/security/security_manager.c | 20 ++++++++++++++++++++
>  src/security/security_manager.h |  3 +++
>  4 files changed, 37 insertions(+), 4 deletions(-)


Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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