From: "Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>
To: Demi Marie Obenour <demi@invisiblethingslab.com>
Cc: Xen developer discussion <xen-devel@lists.xenproject.org>,
Juergen Gross <jgross@suse.com>
Subject: Re: Linux 6.0.8 generates L1TF-vulnerable PTE if Xen's PAT is modified
Date: Sun, 11 Dec 2022 05:34:23 +0100 [thread overview]
Message-ID: <Y5Vd0Oqu1J7Z0j4R@mail-itl> (raw)
In-Reply-To: <Y5OBOHd7hFGR+4GT@itl-email>
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On Fri, Dec 09, 2022 at 01:40:53PM -0500, Demi Marie Obenour wrote:
> If Xen is patched to use the same PAT Linux does, it appears to break
> L1TF mitigations in PV Linux 6.0.8. Linux 5.15.81 works fine. The
> symptom is that Linux fails to boot, with Xen complaining about an
> L1TF-vulnerable PTE with shadow paging disabled.
>
> Details are at https://github.com/QubesOS/qubes-issues/issues/7935.
Call trace:
(early) [ 0.417527] RIP: e030:xen_hypercall_mmu_update+0x8/0x20
(early) [ 0.417534] Code: cc cc 51 41 53 b8 00 00 00 00 0f 05 41 5b 59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 51 41 53 b8 01 00 00 00 <0f> 05 41 5b 59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
(early) [ 0.417537] RSP: e02b:ffffffff82c03d68 EFLAGS: 00000046
(early) [ 0.417540] RAX: 0000000000000001 RBX: 000000039f788000 RCX: ffffffff81e2502a
(early) [ 0.417543] RDX: 0000000000000000 RSI: 0000000080000001 RDI: ffffffff82c03d80
(early) [ 0.417546] RBP: 8010000013600066 R08: ffff888018f88000 R09: 0000000000000000
(early) [ 0.417548] R10: 0000000000007ff0 R11: 0000000000000246 R12: 0000000000000000
(early) [ 0.417550] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
(early) [ 0.417557] FS: 0000000000000000(0000) GS:ffff888013e00000(0000) knlGS:0000000000000000
(early) [ 0.417560] CS: 10000e030 DS: 0000 ES: 0000 CR0: 0000000080050033
(early) [ 0.417562] CR2: ffffc900007cf000 CR3: 0000000002c10000 CR4: 0000000000040660
(early) [ 0.417567] Call Trace:
(early) [ 0.417570] <TASK>
(early) [ 0.417573] ? __xen_set_pte+0xdc/0x210
(early) [ 0.417578] ? kfence_protect_page+0x68/0xd0
(early) [ 0.417582] ? kfence_init_pool+0x12d/0x280
(early) [ 0.417586] ? kfence_init_pool_early+0x4c/0x281
(early) [ 0.417591] ? kfence_init+0x3f/0xc4
(early) [ 0.417594] ? start_kernel+0x40d/0x6ef
(early) [ 0.417599] ? xen_start_kernel+0x5c4/0x5e9
(early) [ 0.417603] ? startup_xen+0x1f/0x1f
(early) [ 0.417607] </TASK>
Automated bisect in progress.
--
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
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next prev parent reply other threads:[~2022-12-11 4:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-09 18:40 Linux 6.0.8 generates L1TF-vulnerable PTE if Xen's PAT is modified Demi Marie Obenour
2022-12-11 4:34 ` Marek Marczykowski-Górecki [this message]
2022-12-11 6:29 ` Juergen Gross
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