| Commit message (Collapse) | Author | Age | Files | Lines |
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Add XEN_DOMCTL_set_max_evtchn which may be used during domain creation to
set the maximum event channel port a domain may use. This may be used to
limit the amount of Xen resources (global mapping space and xenheap) that
a domain may use for event channels.
A domain that does not have a limit set may use all the event channels
supported by the event channel ABI in use.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Keir Fraser <keir@xen.org>
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Xen currently makes no strong distinction between the SMP barriers (smp_mb
etc) and the regular barrier (mb etc). In Linux, where we inherited these
names from having imported Linux code which uses them, the SMP barriers are
intended to be sufficient for implementing shared-memory protocols between
processors in an SMP system while the standard barriers are useful for MMIO
etc.
On x86 with the stronger ordering model there is not much practical difference
here but ARM has weaker barriers available which are suitable for use as SMP
barriers.
Therefore ensure that common code uses the SMP barriers when that is all which
is required.
On both ARM and x86 both types of barrier are currently identical so there is
no actual change. A future patch will change smp_mb to a weaker barrier on
ARM.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
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data via xc_phys_info
During the review of the patches it was noticed that there exists
a race wherein the 'free_memory' value consists of information from
two hypercalls. That is the XEN_SYSCTL_physinfo and XENMEM_get_outstanding_pages.
The free memory the host has available for guest is the difference between
the 'free_pages' (from XEN_SYSCTL_physinfo) and 'outstanding_pages'. As they
are two hypercalls many things can happen in between the execution of them.
This patch resolves this by eliminating the XENMEM_get_outstanding_pages
hypercall and providing the free_pages and outstanding_pages information
via the xc_phys_info structure.
It also removes the XSM hooks and adds locking as needed.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Reviewed-by: Tim Deegan <tim@xen.org>
Acked-by: Keir Fraser <keir.xen@gmail.com>
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Move for_each_set_bit from asm-x86/bitops.h to xen/bitops.h.
Replace #include <asm/bitops.h> with #include <xen/bitops.h> everywhere.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
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This function has been replaced with rcu_lock_domain_by_any_id and an
XSM check. Two callers already had an XSM check; add a check to the
third.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com> (for 4.3 release)
Acked-by: Ian Campbell <ian.campbell@citrix.com> (for thae ARM bits)
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Adds XSM hooks for the recently introduced XENMEM_claim_pages and
XENMEM_get_outstanding_pages operations, and adds FLASK access vectors
for them. This makes the access control decisions for these operations
match those in the rest of the hypervisor.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com> (for 4.3 release)
Acked-by: Keir Fraser <keir@xen.org>
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strlen returns size_t:
policydb.c: In function policydb_read:
policydb.c:1779: error: format %lu expects type long unsigned int, but argument 3 has type size_t
This is probably benign on 64-bit x86 but was found by Dharshini on 32-bit Xen
4.2.x. I expect it affects ARM too.
Reported-by: Dharshini Tharmaraj <dharshinitharmaraj@gmail.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
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The check in guest_physmap_mark_populate_on_demand is redundant, since
its only caller is populate_physmap whose only caller checks the
xsm_memory_adjust_reservation hook prior to calling.
Add a new XSM hook for the other two checks since they allow privileged
domains to arbitrarily map a guest's memory.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com> (release perspective)
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This adds an XSM hook for enabling nested HVM support, replacing an
IS_PRIV check. This hook is a partial duplicate with the xsm_hvm_param
hook, but using the existing hook would require adding the index to the
hook and would require the use of a custom hook for the xsm-disabled
case (using XSM_OTHER, which is less immediately readable) - whereas
adding a new hook retains the clarity of the existing code.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com> (release perspective)
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Make it possible to pass the node-affinity of a domain to the hypervisor
from the upper layers, instead of always being computed automatically.
Note that this also required generalizing the Flask hooks for setting
and getting the affinity, so that they now deal with both vcpu and
node affinity.
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com>
Acked-by: Juergen Gross <juergen.gross@ts.fujitsu.com>
Acked-by: Keir Fraser <keir@xen.org>
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The IRQs beyond nr_static_irqs do not all have an associated PCI
device, so only query the device SID if pci is not NULL.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>
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This hook is not x86-specific; move it out of CONFIG_X86.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Keir Fraser <keir@xen.org>
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Manipulation of a domain's pirq namespace was not fully protected by
XSM hooks because the XSM hooks for IRQs needed a physical IRQ. Since
this may not apply to HVM domains, a complete solution needs to split
the XSM hook for this operation, using one hook for the PIRQ
manipulation and one for controlling access to the hardware IRQ.
This reworking has the advantage of providing the same MSI data to
remove_irq that is provided to add_irq, allowing the PCI device to be
determined in both functions. It also eliminates the last callers of
rcu_lock_target_domain_by_id in x86 and common code in preparation for
this function's removal.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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Treat XENMEM_add_to_physmap_range the same as XENMEM_add_to_physmap.
Reported-by: Lars Rasmusson <Lars.Rasmusson@sics.se>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
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... noticed while putting together the 16Tb support patches for x86.
Briefly, this (in order of the changes below)
- fixes an inefficiency in x86's context switch code (translations to/
from struct page are more involved than to/from MFNs)
- drop unnecessary MFM-to-page conversions
- drop a redundant call to destroy_xen_mappings() (an indentical call
is being made a few lines up)
- simplify a VA-to-MFN translation
- drop dead code (several occurrences)
- add a missing __init annotation
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
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Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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This adds comments to the FLASK access_vectors file describing what
operations each access vector controls and the meanings of the source
and target fields in the permission check. This also makes the
indentation of the file consistent; no functionality changes are made.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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Add getscheduler and setscheduler permissions to replace the
monolithic scheduler permission in the scheduler_op domctl and sysctl.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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This adds a pair of XSM hooks for tmem operations: xsm_tmem_op which
controls any use of tmem, and xsm_tmem_control which allows use of the
TMEM_CONTROL operations. By default, all domains can use tmem while
only IS_PRIV domains can use control operations.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Committed-by: Keir Fraser <keir@xen.org>
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A number of the platform_hypercall XSM hooks have no parameters or
only pass the operation ID, making them redundant with the
xsm_platform_op hook. Remove these redundant hooks.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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A number of the sysctl XSM hooks have no parameters or only pass the
operation ID, making them redundant with the xsm_sysctl hook. Remove
these redundant hooks.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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A number of the domctl XSM hooks do nothing except pass the domain and
operation ID, making them redundant with the xsm_domctl hook. Remove
these redundant hooks.
The remaining domctls all use individual hooks because they pass extra
details of the call to the XSM module in order to allow a more
fine-grained access decision to be made - for example, considering the
exact device or memory range being set up for guest access.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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There are three callers of get_pg_owner:
* do_mmuext_op, which does not have XSM hooks on all subfunctions
* do_mmu_update, which has hooks that are inefficient
* do_update_va_mapping_otherdomain, which has a simple XSM hook
In order to preserve return values for the do_mmuext_op hypercall, an
additional XSM hook is required to check the operation even for those
subfunctions that do not use the pg_owner field. This also covers the
MMUEXT_UNPIN_TABLE operation which did previously have an XSM hook.
The XSM hooks in do_mmu_update were capable of replacing the checks in
get_pg_owner; however, the hooks are buried in the inner loop of the
function - not very good for performance when XSM is enabled and these
turn in to indirect function calls. This patch removes the PTE from
the hooks and replaces it with a bitfield describing what accesses are
being requested. The XSM hook can then be called only when additional
bits are set instead of once per iteration of the loop.
This patch results in a change in the FLASK permissions used for
mapping an MMIO page: the target for the permisison check on the
memory mapping is no longer resolved to the device-specific type, and
is instead either the domain's own type or domio_t (depending on if
the domain uses DOMID_SELF or DOMID_IO in the map
command). Device-specific access is still controlled via the "resource
use" permisison checked at domain creation (or device hotplug).
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Keir Fraser <keir@xen.org>
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This patch adds splits up the mem_sharing and mem_event XSM hooks to
better cover what the code is doing. It also changes the utility
function get_mem_event_op_target to rcu_lock_live_remote_domain_by_id
because there is no mm-specific logic in there.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Tim Deegan <tim@xen.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>
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Because the FLASK XSM module no longer checks IS_PRIV for remote
domain accesses covered by XSM permissions, domains now have the
ability to perform memory management and other functions on all
domains that have the same type. While it is possible to prevent this
by only creating one domain per type, this solution significantly
limits the flexibility of the type system.
This patch introduces a domain type transition to represent a domain
that is operating on itself. In the example policy, this is
demonstrated by creating a type with _self appended when declaring a
domain type which will be used for reflexive operations. AVCs for a
domain of type domU_t will look like the following:
scontext=system_u:system_r:domU_t
tcontext=system_u:system_r:domU_t_self
This change also allows policy to distinguish between event channels a
domain creates to itself and event channels created between domains of
the same type.
The IS_PRIV_FOR check used for device model domains is also no longer
checked by FLASK; a similar transition is performed when the target is
set and used when the device model accesses its target domain.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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The FLASK module was missing implementations of some hooks and did not
have access vectors defined for 10 domctls; define these now.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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The existing domain__set_target check only verifies that the source
and target domains can be associated. We also need to check that the
privileged domain making this association is allowed to do so.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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Signed-off-by: Keir Fraser <keir@xen.org>
--HG--
rename : tools/flask/policy/policy/flask/access_vectors => xen/xsm/flask/policy/access_vectors
rename : tools/flask/policy/policy/flask/initial_sids => xen/xsm/flask/policy/initial_sids
rename : tools/flask/policy/policy/flask/mkaccess_vector.sh => xen/xsm/flask/policy/mkaccess_vector.sh
rename : tools/flask/policy/policy/flask/mkflask.sh => xen/xsm/flask/policy/mkflask.sh
rename : tools/flask/policy/policy/flask/security_classes => xen/xsm/flask/policy/security_classes
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The newly introduced xsm_platform_op hook addresses new sub-ops, while
most ops already have their own XSM hooks.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>
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The xsm_sysctl hook now covers every sysctl, in addition to the more
fine-grained XSM hooks in most sub-functions.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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The xsm_domctl hook now covers every domctl, in addition to the more
fine-grained XSM hooks in most sub-functions. This also removes the
need to special-case XEN_DOMCTL_getdomaininfo.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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The Xen hypervisor has two basic access control function calls:
IS_PRIV and the xsm_* functions. Most privileged operations currently
require that both checks succeed, and many times the checks are at
different locations in the code. This patch eliminates the explicit
and implicit IS_PRIV checks that are duplicated in XSM hooks.
When XSM_ENABLE is not defined or when the dummy XSM module is used,
this patch should not change any functionality. Because the locations
of privilege checks have sometimes moved below argument validation,
error returns of some functions may change from EPERM to EINVAL or
ESRCH if called with invalid arguments and from a domain without
permission to perform the operation.
Some checks are removed due to non-obvious duplicates in their
callers:
* acpi_enter_sleep is checked in XENPF_enter_acpi_sleep
* map_domain_pirq has IS_PRIV_FOR checked in its callers:
* physdev_map_pirq checks when acquiring the RCU lock
* ioapic_guest_write is checked in PHYSDEVOP_apic_write
* PHYSDEVOP_{manage_pci_add,manage_pci_add_ext,pci_device_add} are
checked by xsm_resource_plug_pci in pci_add_device
* PHYSDEVOP_manage_pci_remove is checked by xsm_resource_unplug_pci
in pci_remove_device
* PHYSDEVOP_{restore_msi,restore_msi_ext} are checked by
xsm_resource_setup_pci in pci_restore_msi_state
* do_console_io has changed to IS_PRIV from an explicit domid==0
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>
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The xsm_iomem_permission and xsm_ioport_permission hooks are intended
to be called by the domain builder, while the calls in
arch/x86/domctl.c which control mapping are also performed by the
device model. Because these operations require distinct access
control policies, they cannot use the same XSM hooks.
This also adds a missing XSM hook in the unbind IRQ domctl.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>
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Rather than keeping around headers that are autogenerated in order to
avoid adding build dependencies from xen/ to files in tools/, move the
relevant parts of the FLASK policy into the hypervisor tree and
generate the headers as part of the hypervisor's build.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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This patch moves the implementation of the dummy XSM module to a
header file that provides inline functions when XSM_ENABLE is not
defined. This reduces duplication between the dummy module and callers
when the implementation of the dummy return is not just "return 0",
and also provides better compile-time checking for completeness of the
XSM implementations in the dummy module.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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The concept is X86 specific.
AFAICT the generic concept here is the number of static physical IRQs
which the current hardware has, so call this nr_static_irqs.
Also using "defined NR_IRQS" as a standin for x86 might have made
sense at one point but its just cleaner to push the necessary
definitions into asm/irq.h.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
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Note: these changes don't make any difference on x86.
Replace XEN_GUEST_HANDLE with XEN_GUEST_HANDLE_PARAM when it is used as
an hypercall argument.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
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This adds the ability to change a domain's XSM label after creation.
The new label will be used for all future access checks; however,
existing event channels and memory mappings will remain valid even if
their creation would be denied by the new label.
With appropriate security policy and hooks in the domain builder, this
can be used to create domains that the domain builder does not have
access to after building. It can also be used to allow a domain to
drop privileges - for example, prior to launching a user-supplied
kernel loaded by a pv-grub stubdom.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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This field was only used to populate the ssid of dom0, which can be
handled explicitly in the domain creation hook. This also removes the
unnecessary permission check on the creation of dom0.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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The ability to declare common permission blocks shared across multiple
classes is not currently used in Xen. Currently, support for this
feature is broken in the header generation scripts, and it is not
expected that this feature will be used in the future, so remove the
dead code.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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Doing a reverse lookup from MFN to its owning domain is redundant with
the internal checks Xen does on pages. Change the checks to operate
directly on the domain owning the pages for normal memory; MMIO areas
are still checked with security_iomem_sid.
This fixes a hypervisor crash when a domU attempts to map an MFN that
is free in Xen's heap: the XSM hook is called before the validity
check, and page_get_owner returns garbage when called on these
pages. While explicitly checking for such pages using
page_get_owner_and_reference is a possible solution, this ends up
duplicating parts of get_page_from_l1e.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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A few XSM hooks have been defined without implementation in dummy.c;
these will cause a null function pointer deference if called. Also
implement the efi_call hook, which was incorrectly added without any
implementations.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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Since the mmu_normal_update hook is called even when mapping MFNs
without an associated struct page, attempting to use the struct page
to map between GFN and MFN will cause crashes. Use get_gfn_query
instead.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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A space was missing in the format string.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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Signed-off-by: Tim Deegan <tim@xen.org>
Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
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The audit data for normal MMU updates was incorrectly using the RANGE
type which presented the data badly in audit messages; add a MEMORY
type for this showing the correct names for the fields. This patch
also shows the target domain in event channel mapping checks to make
debugging those denials easier.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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This hypercall allows a domain to identify the security context of a
domain that it is communicating with using the interdomain event
channel that it is using for the communication. This can be used to
augment Xen's security permissions with intra-domain security checks.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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When multiple CPUs hit an AVC audit message, the resulting output in
the ring buffer and serial console is garbled due to the audit process
using many separate printk invocations for each message. Change the
AVC audit process to use a temporary buffer and output the contents
once the entire audit message is complete.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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Don't attempt to relabel the already-bound half of the event channel
pair created by an interdomain event channel. This relabeling also
performed an incorrect check that the destination domain is permitted
to create the reverse event channel, which may not be true if the
unbound channel was created by the domain builder (like the xenstore
channel).
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Keir Fraser <keir@xen.org>
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