Use after free check for all private zones too

[Gumpula, Suresh]

Hi,
  I have attached the diff.  Can somebody please review and commit this ?



Thanks
Suresh


On 5/4/15, 12:49 PM, "Gumpula, Suresh" <Suresh.Gumpula at netapp.com> wrote:

>Hi ,
>     Currently use after free check is available for  power of 2 malloc
>zones ( mt_rash_ctor/ m_trash_dotr ) which writes uma_junk(0xdeadc0de) on
>freed memory and
>validates on reusing the object for others .
>   Similary we( NETAPP)  have added a check for all  other private zones
>too with  trash_ctor/ trash_dtor .    We pass the trash_ctor/trash_dtor
>to uma_zcreate(9) if  it is called with NULL for constructor/destructor.
>This change uncovered the couple of bugs inernally.  One  of this is in
>tcp timer bug
>https://svnweb.freebsd.org/base?view=revision&revision=281599
>
>Its a useful check and uncovers use after free bugs .  Would like to push
>this change .  Any comments/suggestions  please ?
>
>Thanks
>Suresh
>
>
>
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