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From: Jason Gunthorpe <jgg@nvidia.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: dennis.dalessandro@cornelisnetworks.com, dledford@redhat.com,
	linux-rdma@vger.kernel.org,
	Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>,
	stable@vger.kernel.org
Subject: Re: [PATCH for-rc 4/4] IB/hfi1: Fix regressions in security fix
Date: Wed, 7 Apr 2021 15:33:41 -0300
Message-ID: <20210407183341.GA551308@nvidia.com> (raw)
In-Reply-To: <20210329183609.GA3014244@iweiny-DESK2.sc.intel.com>

On Mon, Mar 29, 2021 at 11:36:09AM -0700, Ira Weiny wrote:
> On Mon, Mar 29, 2021 at 09:48:20AM -0400, dennis.dalessandro@cornelisnetworks.com wrote:
> > From: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
> > 
> > The security code guards for non-current mm in all cases for
> > updating the rb tree.
> > 
> > That is ok for insert, but NOT ok for remove, since the insert
> > has already guarded the node from being inserted and the remove
> > can be called with a different mm because of a segfault other similar
> > "close" issues where current-mm is NULL.
> > 
> > Best case, is we leak pages. worst case we delete items for an lru_list
> > more than once:
> > [20945.911107] list_del corruption, ffffa0cd536bcac8->next is LIST_POISON1 (dead000000000100)
> > 
> > Fix by removing the guard from any functions that remove nodes
> > from the tree assuming the node was entered into the tree as valid since
> > the insert is guarded.
> 
> Does this open up a child process being able to remove nodes which the parent
> added?

Dennis?

Jason

  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-29 13:48 [PATCH for-rc 0/4] hfi fixes dennis.dalessandro
2021-03-29 13:48 ` [PATCH for-rc 1/4] IB/hfi1: Call xa_destroy before freeing dummy_netdev dennis.dalessandro
2021-03-29 14:09   ` Jason Gunthorpe
2021-03-31 19:36     ` Dennis Dalessandro
2021-04-01  6:06       ` Greg KH
2021-04-01 14:02         ` Dennis Dalessandro
2021-04-01 14:12           ` Greg KH
2021-04-01 15:00             ` Dennis Dalessandro
2021-04-01 12:33       ` Jason Gunthorpe
2021-04-01 13:42         ` Wan, Kaike
2021-04-01 13:48           ` Jason Gunthorpe
2021-03-29 13:48 ` [PATCH for-rc 2/4] IB/hfi1: Call xa_destroy before unloading the module dennis.dalessandro
2021-03-29 14:11   ` Jason Gunthorpe
2021-04-08 13:30     ` Dennis Dalessandro
2021-03-29 13:48 ` [PATCH for-rc 3/4] IB/hfi1: Fix probe time panic when AIP is enabled with a buggy BIOS dennis.dalessandro
2021-04-07 23:04   ` Jason Gunthorpe
2021-03-29 13:48 ` [PATCH for-rc 4/4] IB/hfi1: Fix regressions in security fix dennis.dalessandro
2021-03-29 18:36   ` Ira Weiny
2021-04-07 18:33     ` Jason Gunthorpe [this message]
2021-04-07 20:20       ` Dennis Dalessandro
2021-04-13 22:55   ` Jason Gunthorpe

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