From: Khalid Aziz <khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
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Subject: [RFC PATCH v9 02/13] x86: always set IF before oopsing from page fault
Date: Wed, 3 Apr 2019 11:34:03 -0600 [thread overview]
Message-ID: <e6c57f675e5b53d4de266412aa526b7660c47918.1554248002.git.khalid.aziz@oracle.com> (raw)
In-Reply-To: <cover.1554248001.git.khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
In-Reply-To: <cover.1554248001.git.khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
From: Tycho Andersen <tycho-E0fblnxP3wo@public.gmane.org>
Oopsing might kill the task, via rewind_stack_do_exit() at the bottom, and
that might sleep:
Aug 23 19:30:27 xpfo kernel: [ 38.302714] BUG: sleeping function called from invalid context at ./include/linux/percpu-rwsem.h:33
Aug 23 19:30:27 xpfo kernel: [ 38.303837] in_atomic(): 0, irqs_disabled(): 1, pid: 1970, name: lkdtm_xpfo_test
Aug 23 19:30:27 xpfo kernel: [ 38.304758] CPU: 3 PID: 1970 Comm: lkdtm_xpfo_test Tainted: G D 4.13.0-rc5+ #228
Aug 23 19:30:27 xpfo kernel: [ 38.305813] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.1-1ubuntu1 04/01/2014
Aug 23 19:30:27 xpfo kernel: [ 38.306926] Call Trace:
Aug 23 19:30:27 xpfo kernel: [ 38.307243] dump_stack+0x63/0x8b
Aug 23 19:30:27 xpfo kernel: [ 38.307665] ___might_sleep+0xec/0x110
Aug 23 19:30:27 xpfo kernel: [ 38.308139] __might_sleep+0x45/0x80
Aug 23 19:30:27 xpfo kernel: [ 38.308593] exit_signals+0x21/0x1c0
Aug 23 19:30:27 xpfo kernel: [ 38.309046] ? blocking_notifier_call_chain+0x11/0x20
Aug 23 19:30:27 xpfo kernel: [ 38.309677] do_exit+0x98/0xbf0
Aug 23 19:30:27 xpfo kernel: [ 38.310078] ? smp_reader+0x27/0x40 [lkdtm]
Aug 23 19:30:27 xpfo kernel: [ 38.310604] ? kthread+0x10f/0x150
Aug 23 19:30:27 xpfo kernel: [ 38.311045] ? read_user_with_flags+0x60/0x60 [lkdtm]
Aug 23 19:30:27 xpfo kernel: [ 38.311680] rewind_stack_do_exit+0x17/0x20
To be safe, let's just always enable irqs.
The particular case I'm hitting is:
Aug 23 19:30:27 xpfo kernel: [ 38.278615] __bad_area_nosemaphore+0x1a9/0x1d0
Aug 23 19:30:27 xpfo kernel: [ 38.278617] bad_area_nosemaphore+0xf/0x20
Aug 23 19:30:27 xpfo kernel: [ 38.278618] __do_page_fault+0xd1/0x540
Aug 23 19:30:27 xpfo kernel: [ 38.278620] ? irq_work_queue+0x9b/0xb0
Aug 23 19:30:27 xpfo kernel: [ 38.278623] ? wake_up_klogd+0x36/0x40
Aug 23 19:30:27 xpfo kernel: [ 38.278624] trace_do_page_fault+0x3c/0xf0
Aug 23 19:30:27 xpfo kernel: [ 38.278625] do_async_page_fault+0x14/0x60
Aug 23 19:30:27 xpfo kernel: [ 38.278627] async_page_fault+0x28/0x30
When a fault is in kernel space which has been triggered by XPFO.
Signed-off-by: Tycho Andersen <tycho-E0fblnxP3wo@public.gmane.org>
CC: x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org
Tested-by: Khalid Aziz <khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: Khalid Aziz <khalid-21RPF02GE+GXwddmVfQv5g@public.gmane.org>
---
arch/x86/mm/fault.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 9d5c75f02295..7891add0913f 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -858,6 +858,12 @@ no_context(struct pt_regs *regs, unsigned long error_code,
/* Executive summary in case the body of the oops scrolled away */
printk(KERN_DEFAULT "CR2: %016lx\n", address);
+ /*
+ * We're about to oops, which might kill the task. Make sure we're
+ * allowed to sleep.
+ */
+ flags |= X86_EFLAGS_IF;
+
oops_end(flags, regs, sig);
}
--
2.17.1
next prev parent reply other threads:[~2019-04-03 17:34 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 17:34 [RFC PATCH v9 00/13] Add support for eXclusive Page Frame Ownership Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 11/13] xpfo, mm: optimize spinlock usage in xpfo_kunmap Khalid Aziz
[not found] ` <5bab13e12d4215112ad2180106cc6bb9b513754a.1554248002.git.khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-04 7:56 ` Peter Zijlstra
2019-04-04 16:06 ` Khalid Aziz
[not found] ` <cover.1554248001.git.khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-03 17:34 ` [RFC PATCH v9 01/13] mm: add MAP_HUGETLB support to vm_mmap Khalid Aziz
2019-04-03 17:34 ` Khalid Aziz [this message]
[not found] ` <e6c57f675e5b53d4de266412aa526b7660c47918.1554248002.git.khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-04 0:12 ` [RFC PATCH v9 02/13] x86: always set IF before oopsing from page fault Andy Lutomirski
[not found] ` <CALCETrXvwuwkVSJ+S5s7wTBkNNj3fRVxpx9BvsXWrT=3ZdRnCw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-04 1:42 ` Tycho Andersen
2019-04-04 4:12 ` Andy Lutomirski
[not found] ` <CALCETrVp37Xo3EMHkeedP1zxUMf9og=mceBa8c55e1F4G1DRSQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-04 15:47 ` Tycho Andersen
2019-04-04 16:23 ` Sebastian Andrzej Siewior
2019-04-04 16:28 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1904041822320.1802-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2019-04-04 17:11 ` Andy Lutomirski
2019-04-03 17:34 ` [RFC PATCH v9 03/13] mm: Add support for eXclusive Page Frame Ownership (XPFO) Khalid Aziz
[not found] ` <f1ac3700970365fb979533294774af0b0dd84b3b.1554248002.git.khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-04 7:21 ` Peter Zijlstra
[not found] ` <20190404072152.GN4038-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2019-04-04 9:25 ` Peter Zijlstra
2019-04-04 14:48 ` Tycho Andersen
2019-04-04 7:43 ` Peter Zijlstra
[not found] ` <20190404074323.GO4038-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2019-04-04 15:15 ` Khalid Aziz
[not found] ` <b414bacc-2883-1914-38ec-3d8f4a032e10-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-04 17:01 ` Peter Zijlstra
2019-04-17 16:15 ` Ingo Molnar
2019-04-17 16:15 ` Ingo Molnar
[not found] ` <20190417161042.GA43453-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2019-04-17 16:49 ` Khalid Aziz
2019-04-17 16:49 ` Khalid Aziz
2019-04-17 17:09 ` Ingo Molnar
2019-04-17 17:09 ` Ingo Molnar
2019-04-17 17:19 ` Nadav Amit
2019-04-17 17:19 ` Nadav Amit
2019-04-17 17:26 ` Ingo Molnar
2019-04-17 17:26 ` Ingo Molnar
2019-04-17 17:44 ` Nadav Amit
2019-04-17 17:44 ` Nadav Amit
2019-04-17 21:19 ` Thomas Gleixner
2019-04-17 21:19 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1904172317460.3174-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2019-04-17 23:18 ` Linus Torvalds
2019-04-17 23:18 ` Linus Torvalds
2019-04-17 23:42 ` Thomas Gleixner
2019-04-17 23:42 ` Thomas Gleixner
2019-04-17 23:52 ` Linus Torvalds
2019-04-17 23:52 ` Linus Torvalds
2019-04-18 4:41 ` Andy Lutomirski
2019-04-18 4:41 ` Andy Lutomirski
2019-04-18 5:41 ` Kees Cook
2019-04-18 5:41 ` Kees Cook via iommu
2019-04-18 14:34 ` Khalid Aziz
2019-04-18 14:34 ` Khalid Aziz
2019-04-22 19:30 ` Khalid Aziz
2019-04-22 19:30 ` Khalid Aziz
[not found] ` <8f9d059d-e720-cd24-faa6-45493fc012e0-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-22 22:23 ` Kees Cook via iommu
2019-04-22 22:23 ` Kees Cook via iommu
[not found] ` <CAHk-=whUwOjFW6RjHVM8kNOv1QVLJuHj2Dda0=mpLPdJ1UyatQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-18 6:14 ` Thomas Gleixner
2019-04-18 6:14 ` Thomas Gleixner
2019-04-17 17:33 ` Khalid Aziz
2019-04-17 17:33 ` Khalid Aziz
2019-04-17 19:49 ` Andy Lutomirski
2019-04-17 19:49 ` Andy Lutomirski
[not found] ` <CALCETrXFzWFMrV-zDa4QFjB=4WnC9RZmorBko65dLGhymDpeQw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-17 19:52 ` Tycho Andersen
2019-04-17 19:52 ` Tycho Andersen
2019-04-17 20:12 ` Khalid Aziz
2019-04-17 20:12 ` Khalid Aziz
2019-05-01 14:49 ` Waiman Long
2019-05-01 14:49 ` Waiman Long
2019-05-01 15:18 ` Khalid Aziz
2019-05-01 15:18 ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 04/13] xpfo, x86: Add support for XPFO for x86-64 Khalid Aziz
[not found] ` <c15e7d09dfe3dfdb9947d39ed0ddd6573ff86dbf.1554248002.git.khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-04 7:52 ` Peter Zijlstra
[not found] ` <20190404075206.GP4038-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2019-04-04 15:40 ` Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 05/13] mm: add a user_virt_to_phys symbol Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 06/13] lkdtm: Add test for XPFO Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 07/13] arm64/mm: Add support " Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 08/13] swiotlb: Map the buffer if it was unmapped by XPFO Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 09/13] xpfo: add primitives for mapping underlying memory Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 10/13] arm64/mm, xpfo: temporarily map dcache regions Khalid Aziz
2019-04-03 17:34 ` [RFC PATCH v9 12/13] xpfo, mm: Defer TLB flushes for non-current CPUs (x86 only) Khalid Aziz
[not found] ` <4495dda4bfc4a06b3312cc4063915b306ecfaecb.1554248002.git.khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-04 4:10 ` Andy Lutomirski
[not found] ` <CALCETrXMXxnWqN94d83UvGWhkD1BNWiwvH2vsUth1w0T3=0ywQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-04 22:55 ` Khalid Aziz
[not found] ` <91f1dbce-332e-25d1-15f6-0e9cfc8b797b-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2019-04-05 7:17 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1904050909520.1802-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2019-04-05 14:44 ` Dave Hansen
[not found] ` <26b00051-b03c-9fce-1446-52f0d6ed52f8-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2019-04-05 15:24 ` Andy Lutomirski
2019-04-05 15:24 ` Andy Lutomirski
[not found] ` <DFA69954-3F0F-4B79-A9B5-893D33D87E51-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
2019-04-05 15:56 ` Tycho Andersen
2019-04-05 15:56 ` Tycho Andersen
2019-04-05 16:32 ` Andy Lutomirski
2019-04-05 16:32 ` Andy Lutomirski
2019-04-05 15:56 ` Khalid Aziz
2019-04-05 15:56 ` Khalid Aziz
2019-04-05 16:01 ` Dave Hansen
2019-04-05 16:01 ` Dave Hansen
[not found] ` <36b999d4-adf6-08a3-2897-d77b9cba20f8-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2019-04-05 16:27 ` Andy Lutomirski
2019-04-05 16:27 ` Andy Lutomirski
[not found] ` <E0BBD625-6FE0-4A8A-884B-E10FAFC3319E-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
2019-04-05 16:41 ` Peter Zijlstra
2019-04-05 16:41 ` Peter Zijlstra
2019-04-05 17:35 ` Khalid Aziz
2019-04-05 17:35 ` Khalid Aziz
2019-04-05 15:44 ` Khalid Aziz
2019-04-05 15:44 ` Khalid Aziz
2019-04-05 15:24 ` Andy Lutomirski
2019-04-05 15:24 ` Andy Lutomirski
2019-04-04 8:18 ` Peter Zijlstra
2019-04-03 17:34 ` [RFC PATCH v9 13/13] xpfo, mm: Optimize XPFO TLB flushes by batching them together Khalid Aziz
2019-04-06 6:40 ` [RFC PATCH v9 00/13] Add support for eXclusive Page Frame Ownership Jon Masters
2019-04-06 6:40 ` Jon Masters
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