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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------zP68rpYrZp0Uzl9j10Hk0qmJ" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------zP68rpYrZp0Uzl9j10Hk0qmJ Content-Type: multipart/mixed; boundary="------------3DjjrTYtUxIfPkonGj3cKuPy"; protected-headers="v1" Message-ID: <0f4014cb-77d4-4d31-96cd-ea584ed8bba1@gmail.com> Date: Fri, 19 Dec 2025 21:02:18 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] 9p/xen: mark 9p transport device as closing when removing it To: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= , Ariadne Conill , v9fs@lists.linux.dev Cc: xen-devel@lists.xenproject.org, asmadeus@codewreck.org, linux_oss@crudebyte.com, lucho@ionkov.net, ericvh@kernel.org, Stefano Stabellini , Alex Zenla References: <20251208195155.27473-1-ariadne@ariadne.space> <409cccec-15dd-4e80-ba56-f0bba12772cb@gmail.com> <548207b3-c941-4956-bf2c-11eee467777b@suse.com> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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boundary="------------4YoX49qTQIA0OtTPwVPWuSpb" --------------4YoX49qTQIA0OtTPwVPWuSpb Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 12/18/25 03:14, J=C3=BCrgen Gro=C3=9F wrote: > On 09.12.25 11:41, Demi Marie Obenour wrote: >> On 12/8/25 14:51, Ariadne Conill wrote: >>> We need to do this so that we can signal to the other end that the >>> device is being removed, so that it will release its claim on the >>> underlying memory allocation. Otherwise releasing the grant-table >>> entries is deferred resulting in a kernel oops since the pages have >>> already been freed. >> >> I don't think this is sufficient. The backend can simply refuse >> to release the grants. The frontend needs to ensure that the pages >> are not freed until the grant table entries are freed. Right now, >> the backend can cause a use-after-free in the frontend, and my >> understanding of the Xen Project's security policy is that this is >> a security vulnerability in the frontend code. >> >> My instinct is that the core Xen code should take a reference on >> each page before granting it to another domain, and not release that >> reference until the pages are no longer granted. This should prevent >> any use-after-free problems if I understand Linux core MM correctly. >=20 > I looked at this in detail now. >=20 > I don't think we have a security bug right now, but the interfaces rega= rding > granting pages to other domains should probably be reworked like you su= ggest. >=20 > Currently it is the caller who needs to handle page references correctl= y, > while this should be done by the grant handling (having to either issue= > get_page() or to pass NULL for the page pointer, in case you don't want= the > underlying page to be freed by gnttab_end_foreign_access(), is far from= > intuitive). Unfortunately, I don't think this is going to work. Page refcounts are going away. Taking a reference on kmalloc()'d memory already runs into a VM_BUG_ON_FOLIO(). So the only reasonable approach is a callback that is run when the grant is no longer accessible by the backend. It could well be that this is another example of a bug in 9p that also affects virtio. More details about the memory management and virtio-9p situation can be found in the thread at . A much better API would allow the grantor of a page to revoke the grantee's access, with subsequent accesses by the grantee redirected to a scratch page. For PVH/HVM guests I expect this to be possible, but for PV guests it would require Xen to modify the guest's own page tables. My understanding is that this isn't allowed as it would break the guest. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------4YoX49qTQIA0OtTPwVPWuSpb Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49y B+l2nipdaq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYf bWpr/si88QKgyGSVZ7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/ UorR+FaSuVwT7rqzGrTlscnTDlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7M MPCJwI8JpPlBedRpe9tfVyfu3euTPLPxwcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9H zx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR6h3nBc3eyuZ+q62HS1pJ5EvU T1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl5FMWo8TCniHynNXs BtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2Bkg1b//r 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