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xen/5582bf81-evtchn-remove-the-locking-when-unmasking-an-event-channel.patch

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- bnc#935634 - VUL-0: CVE-2015-3259: xen: XSA-137: xl command line config handling stack overflow CVE-2015-3259-xsa137.patch - Upstream patches from Jan 558bfaa0-x86-traps-avoid-using-current-too-early.patch 5592a116-nested-EPT-fix-the-handling-of-nested-EPT.patch 559b9dd6-x86-p2m-ept-don-t-unmap-in-use-EPT-pagetable.patch 559bdde5-pull-in-latest-linux-earlycpio.patch - Upstream patches from Jan pending review 552d0fd2-x86-hvm-don-t-include-asm-spinlock-h.patch 552d0fe8-x86-mtrr-include-asm-atomic.h.patch 552d293b-x86-vMSI-X-honor-all-mask-requests.patch 552d2966-x86-vMSI-X-add-valid-bits-for-read-acceleration.patch 554c7aee-x86-provide-arch_fetch_and_add.patch 554c7b00-arm-provide-arch_fetch_and_add.patch 55534b0a-x86-provide-add_sized.patch 55534b25-arm-provide-add_sized.patch 5555a4f8-use-ticket-locks-for-spin-locks.patch 5555a5b9-x86-arm-remove-asm-spinlock-h.patch 5555a8ec-introduce-non-contiguous-allocation.patch 55795a52-x86-vMSI-X-support-qword-MMIO-access.patch 557eb55f-gnttab-per-active-entry-locking.patch 557eb5b6-gnttab-introduce-maptrack-lock.patch 557eb620-gnttab-make-the-grant-table-lock-a-read-write-lock.patch 557ffab8-evtchn-factor-out-freeing-an-event-channel.patch 5582bf43-evtchn-simplify-port_is_valid.patch 5582bf81-evtchn-remove-the-locking-when-unmasking-an-event-channel.patch 5583d9c5-x86-MSI-X-cleanup.patch 5583da09-x86-MSI-track-host-and-guest-masking-separately.patch 5583da64-gnttab-use-per-VCPU-maptrack-free-lists.patch OBS-URL: https://build.opensuse.org/package/show/Virtualization/xen?expand=0&rev=369
2015-07-10 15:21:29 +00:00
# Commit e156654d4eb2fdeb524e6b40838767a5dc918966
# Date 2015-06-18 14:54:25 +0200
# Author David Vrabel <david.vrabel@citrix.com>
# Committer Jan Beulich <jbeulich@suse.com>
evtchn: remove the locking when unmasking an event channel
The event channel lock is no longer required to check if the port is
valid.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
--- sle12sp1.orig/xen/common/event_channel.c 2015-07-08 13:53:50.000000000 +0200
+++ sle12sp1/xen/common/event_channel.c 2015-07-08 13:54:42.000000000 +0200
@@ -934,8 +934,6 @@ int evtchn_unmask(unsigned int port)
struct domain *d = current->domain;
struct evtchn *evtchn;
- ASSERT(spin_is_locked(&d->event_lock));
-
if ( unlikely(!port_is_valid(d, port)) )
return -EINVAL;
@@ -1102,9 +1100,7 @@ long do_event_channel_op(int cmd, XEN_GU
struct evtchn_unmask unmask;
if ( copy_from_guest(&unmask, arg, 1) != 0 )
return -EFAULT;
- spin_lock(&current->domain->event_lock);
rc = evtchn_unmask(unmask.port);
- spin_unlock(&current->domain->event_lock);
break;
}
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