Re: [ros-dev] [ros-diffs] [hbelusca] 70707: [CMLIB]: Implement CmpFreeSecurityDescriptor. See r70609. CORE-10793 CORE-10796

[Alex Ionescu]

On Wed, Feb 10, 2016 at 5:28 PM,  <hbelusca(a)svn.reactos.org> wrote:
>   else // if (SecurityData->ReferenceCount <= 1)
Is the intent to free the data while SecurityData->RefCount will remain at 1?!

Best regards,
Alex Ionescu

[Hermès BÉLUSCA - MAÏTO]

Yes: When the key is initialized and a security block is added ,the refcount
is set to 1 (see e.g.
https://git.reactos.org/?p=reactos.git;a=blob;f=reactos/tools/mkhive/cmi.c;h
b=HEAD#l173 ), and then, it is increased when other keys use this security
block and decreased when other keys are deleted (and hence, release this
security block). When you delete the key and the security refcount was == 1,
then it means this was the last reference to the security block that is
going to disappear, hence you can remove now the security block.

Also, http://www.sentinelchicken.com/data/TheWindowsNTRegistryFileFormat.pdf
end of section 11, page 5, seems to back up what I say.

Regards,
Hermès

P.S.: http://amnesia.gtisc.gatech.edu/~moyix/suzibandit.ltd.uk/MSc/ is a
nice source of information about the NT registry (in case you didn't know it
already).


-----Message d'origine-----
De : Ros-dev [mailto:[e-mail]] De la part de Alex Ionescu
Envoyé : jeudi 11 février 2016 00:58
À : ReactOS Development List
Cc : Linda Wang
Objet : Re: [ros-dev] [ros-diffs] [hbelusca] 70707: [CMLIB]: Implement
CmpFreeSecurityDescriptor. See r70609. CORE-10793 CORE-10796

On Wed, Feb 10, 2016 at 5:28 PM,  <hbelusca(a)svn.reactos.org> wrote:
>   else // if (SecurityData->ReferenceCount <= 1)
Is the intent to free the data while SecurityData->RefCount will remain at
1?!

Best regards,
Alex Ionescu

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