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* [PATCH v2 0/5] KVM: rseq: Fix and a test for a KVM+rseq bug
@ 2021-08-20 22:49 Sean Christopherson
  2021-08-20 22:49 ` [PATCH v2 1/5] KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest Sean Christopherson
                   ` (4 more replies)
  0 siblings, 5 replies; 16+ messages in thread
From: Sean Christopherson @ 2021-08-20 22:49 UTC (permalink / raw)
  To: Russell King, Catalin Marinas, Will Deacon, Guo Ren,
	Thomas Bogendoerfer, Michael Ellerman, Heiko Carstens,
	Vasily Gorbik, Christian Borntraeger, Steven Rostedt,
	Ingo Molnar, Oleg Nesterov, Thomas Gleixner, Peter Zijlstra,
	Andy Lutomirski, Mathieu Desnoyers, Paul E. McKenney, Boqun Feng,
	Paolo Bonzini, Shuah Khan
  Cc: Benjamin Herrenschmidt, Paul Mackerras, linux-arm-kernel,
	linux-kernel, linux-csky, linux-mips, linuxppc-dev, linux-s390,
	kvm, linux-kselftest, Peter Foley, Shakeel Butt,
	Sean Christopherson, Ben Gardon

Patch 1 fixes a KVM+rseq bug where KVM's handling of TIF_NOTIFY_RESUME,
e.g. for task migration, clears the flag without informing rseq and leads
to stale data in userspace's rseq struct.

Patch 2 is a cleanup to try and make future bugs less likely.  It's also
a baby step towards moving and renaming tracehook_notify_resume() since
it has nothing to do with tracing.

Patch 3 is a fix/cleanup to stop overriding x86's unistd_{32,64}.h when
the include path (intentionally) omits tools' uapi headers.  KVM's
selftests do exactly that so that they can pick up the uapi headers from
the installed kernel headers, and still use various tools/ headers that
mirror kernel code, e.g. linux/types.h.  This allows the new test in
patch 4 to reference __NR_rseq without having to manually define it.

Patch 4 is a regression test for the KVM+rseq bug.

Patch 5 is a cleanup made possible by patch 3.

v2:
  - Don't touch rseq_cs when handling KVM case so that rseq_syscall() will
    still detect a naughty userspace. [Mathieu]
  - Use a sequence counter + retry in the test to ensure the process isn't
    migrated between sched_getcpu() and reading rseq.cpu_id, i.e. to
    avoid a flaky test. [Mathieu]
  - Add Mathieu's ack for patch 2.
  - Add more comments in the test.

v1: https://lkml.kernel.org/r/20210818001210.4073390-1-seanjc@google.com

Sean Christopherson (5):
  KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM
    guest
  entry: rseq: Call rseq_handle_notify_resume() in
    tracehook_notify_resume()
  tools: Move x86 syscall number fallbacks to .../uapi/
  KVM: selftests: Add a test for KVM_RUN+rseq to detect task migration
    bugs
  KVM: selftests: Remove __NR_userfaultfd syscall fallback

 arch/arm/kernel/signal.c                      |   1 -
 arch/arm64/kernel/signal.c                    |   1 -
 arch/csky/kernel/signal.c                     |   4 +-
 arch/mips/kernel/signal.c                     |   4 +-
 arch/powerpc/kernel/signal.c                  |   4 +-
 arch/s390/kernel/signal.c                     |   1 -
 include/linux/tracehook.h                     |   2 +
 kernel/entry/common.c                         |   4 +-
 kernel/rseq.c                                 |  14 +-
 .../x86/include/{ => uapi}/asm/unistd_32.h    |   0
 .../x86/include/{ => uapi}/asm/unistd_64.h    |   3 -
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +
 tools/testing/selftests/kvm/rseq_test.c       | 154 ++++++++++++++++++
 14 files changed, 175 insertions(+), 21 deletions(-)
 rename tools/arch/x86/include/{ => uapi}/asm/unistd_32.h (100%)
 rename tools/arch/x86/include/{ => uapi}/asm/unistd_64.h (83%)
 create mode 100644 tools/testing/selftests/kvm/rseq_test.c

-- 
2.33.0.rc2.250.ged5fa647cd-goog


^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2021-08-28  0:06 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-20 22:49 [PATCH v2 0/5] KVM: rseq: Fix and a test for a KVM+rseq bug Sean Christopherson
2021-08-20 22:49 ` [PATCH v2 1/5] KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest Sean Christopherson
2021-08-23 15:00   ` Mathieu Desnoyers
2021-08-20 22:49 ` [PATCH v2 2/5] entry: rseq: Call rseq_handle_notify_resume() in tracehook_notify_resume() Sean Christopherson
2021-08-20 22:50 ` [PATCH v2 3/5] tools: Move x86 syscall number fallbacks to .../uapi/ Sean Christopherson
2021-08-20 22:50 ` [PATCH v2 4/5] KVM: selftests: Add a test for KVM_RUN+rseq to detect task migration bugs Sean Christopherson
2021-08-23 15:18   ` Mathieu Desnoyers
2021-08-23 15:20     ` Mathieu Desnoyers
2021-08-26  0:51       ` Sean Christopherson
2021-08-26 18:42         ` Mathieu Desnoyers
2021-08-26 23:54           ` Sean Christopherson
2021-08-27 19:09             ` Mathieu Desnoyers
2021-08-27 23:23               ` Sean Christopherson
2021-08-28  0:06                 ` Mathieu Desnoyers
2021-08-20 22:50 ` [PATCH v2 5/5] KVM: selftests: Remove __NR_userfaultfd syscall fallback Sean Christopherson
2021-08-23 23:46   ` Ben Gardon

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