svn commit: r450121 - in head/emulators/xen-kernel: . files
Roger Pau Monné
royger at FreeBSD.org
Tue Sep 19 12:56:52 UTC 2017
Author: royger (src committer)
Date: Tue Sep 19 12:56:50 2017
New Revision: 450121
URL: https://svnweb.freebsd.org/changeset/ports/450121
Log:
xen: apply XSA-{231-234}
MFH: 2017Q3
Approved by: bapt
Sponsored by: Citrix Systems R&D
Added:
head/emulators/xen-kernel/files/xsa231-4.7.patch (contents, props changed)
head/emulators/xen-kernel/files/xsa232.patch (contents, props changed)
head/emulators/xen-kernel/files/xsa233.patch (contents, props changed)
head/emulators/xen-kernel/files/xsa234-4.8.patch (contents, props changed)
Modified:
head/emulators/xen-kernel/Makefile
Modified: head/emulators/xen-kernel/Makefile
==============================================================================
--- head/emulators/xen-kernel/Makefile Tue Sep 19 12:31:54 2017 (r450120)
+++ head/emulators/xen-kernel/Makefile Tue Sep 19 12:56:50 2017 (r450121)
@@ -2,7 +2,7 @@
PORTNAME= xen
PORTVERSION= 4.7.2
-PORTREVISION= 4
+PORTREVISION= 5
CATEGORIES= emulators
MASTER_SITES= http://downloads.xenproject.org/release/xen/${PORTVERSION}/
PKGNAMESUFFIX= -kernel
@@ -63,7 +63,11 @@ EXTRA_PATCHES= ${FILESDIR}/0001-xen-logdirty-prevent-p
${FILESDIR}/xsa226-4.7.patch:-p1 \
${FILESDIR}/xsa227.patch:-p1 \
${FILESDIR}/xsa228-4.8.patch:-p1 \
- ${FILESDIR}/xsa230.patch:-p1
+ ${FILESDIR}/xsa230.patch:-p1 \
+ ${FILESDIR}/xsa231-4.7.patch:-p1 \
+ ${FILESDIR}/xsa232.patch:-p1 \
+ ${FILESDIR}/xsa233.patch:-p1 \
+ ${FILESDIR}/xsa234-4.8.patch:-p1
.include <bsd.port.options.mk>
Added: head/emulators/xen-kernel/files/xsa231-4.7.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/emulators/xen-kernel/files/xsa231-4.7.patch Tue Sep 19 12:56:50 2017 (r450121)
@@ -0,0 +1,108 @@
+From: George Dunlap <george.dunlap at citrix.com>
+Subject: xen/mm: make sure node is less than MAX_NUMNODES
+
+The output of MEMF_get_node(memflags) can be as large as nodeid_t can
+hold (currently 255). This is then used as an index to arrays of size
+MAX_NUMNODE, which is 64 on x86 and 1 on ARM, can be passed in by an
+untrusted guest (via memory_exchange and increase_reservation) and is
+not currently bounds-checked.
+
+Check the value in page_alloc.c before using it, and also check the
+value in the hypercall call sites and return -EINVAL if appropriate.
+Don't permit domains other than the hardware or control domain to
+allocate node-constrained memory.
+
+This is XSA-231.
+
+Reported-by: Matthew Daley <mattd at bugfuzz.com>
+Signed-off-by: George Dunlap <george.dunlap at citrix.com>
+Signed-off-by: Jan Beulich <jbeulich at suse.com>
+Reviewed-by: Andrew Cooper <andrew.cooper3 at citrix.com>
+
+--- a/xen/common/memory.c
++++ b/xen/common/memory.c
+@@ -390,6 +390,31 @@ static void decrease_reservation(struct
+ a->nr_done = i;
+ }
+
++static bool_t propagate_node(unsigned int xmf, unsigned int *memflags)
++{
++ const struct domain *currd = current->domain;
++
++ BUILD_BUG_ON(XENMEMF_get_node(0) != NUMA_NO_NODE);
++ BUILD_BUG_ON(MEMF_get_node(0) != NUMA_NO_NODE);
++
++ if ( XENMEMF_get_node(xmf) == NUMA_NO_NODE )
++ return 1;
++
++ if ( is_hardware_domain(currd) || is_control_domain(currd) )
++ {
++ if ( XENMEMF_get_node(xmf) >= MAX_NUMNODES )
++ return 0;
++
++ *memflags |= MEMF_node(XENMEMF_get_node(xmf));
++ if ( xmf & XENMEMF_exact_node_request )
++ *memflags |= MEMF_exact_node;
++ }
++ else if ( xmf & XENMEMF_exact_node_request )
++ return 0;
++
++ return 1;
++}
++
+ static long memory_exchange(XEN_GUEST_HANDLE_PARAM(xen_memory_exchange_t) arg)
+ {
+ struct xen_memory_exchange exch;
+@@ -462,6 +487,12 @@ static long memory_exchange(XEN_GUEST_HA
+ }
+ }
+
++ if ( unlikely(!propagate_node(exch.out.mem_flags, &memflags)) )
++ {
++ rc = -EINVAL;
++ goto fail_early;
++ }
++
+ d = rcu_lock_domain_by_any_id(exch.in.domid);
+ if ( d == NULL )
+ {
+@@ -480,7 +511,6 @@ static long memory_exchange(XEN_GUEST_HA
+ d,
+ XENMEMF_get_address_bits(exch.out.mem_flags) ? :
+ (BITS_PER_LONG+PAGE_SHIFT)));
+- memflags |= MEMF_node(XENMEMF_get_node(exch.out.mem_flags));
+
+ for ( i = (exch.nr_exchanged >> in_chunk_order);
+ i < (exch.in.nr_extents >> in_chunk_order);
+@@ -834,12 +864,8 @@ static int construct_memop_from_reservat
+ }
+ read_unlock(&d->vnuma_rwlock);
+ }
+- else
+- {
+- a->memflags |= MEMF_node(XENMEMF_get_node(r->mem_flags));
+- if ( r->mem_flags & XENMEMF_exact_node_request )
+- a->memflags |= MEMF_exact_node;
+- }
++ else if ( unlikely(!propagate_node(r->mem_flags, &a->memflags)) )
++ return -EINVAL;
+
+ return 0;
+ }
+--- a/xen/common/page_alloc.c
++++ b/xen/common/page_alloc.c
+@@ -711,9 +711,13 @@ static struct page_info *alloc_heap_page
+ if ( node >= MAX_NUMNODES )
+ node = cpu_to_node(smp_processor_id());
+ }
++ else if ( unlikely(node >= MAX_NUMNODES) )
++ {
++ ASSERT_UNREACHABLE();
++ return NULL;
++ }
+ first_node = node;
+
+- ASSERT(node < MAX_NUMNODES);
+ ASSERT(zone_lo <= zone_hi);
+ ASSERT(zone_hi < NR_ZONES);
+
Added: head/emulators/xen-kernel/files/xsa232.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/emulators/xen-kernel/files/xsa232.patch Tue Sep 19 12:56:50 2017 (r450121)
@@ -0,0 +1,23 @@
+From: Andrew Cooper <andrew.cooper3 at citrix.com>
+Subject: grant_table: fix GNTTABOP_cache_flush handling
+
+Don't fall over a NULL grant_table pointer when the owner of the domain
+is a system domain (DOMID_{XEN,IO} etc).
+
+This is XSA-232.
+
+Reported-by: Matthew Daley <mattd at bugfuzz.com>
+Signed-off-by: Andrew Cooper <andrew.cooper3 at citrix.com>
+Reviewed-by: Jan Beulich <jbeulich at suse.com>
+
+--- a/xen/common/grant_table.c
++++ b/xen/common/grant_table.c
+@@ -3053,7 +3053,7 @@ static int cache_flush(gnttab_cache_flus
+
+ page = mfn_to_page(mfn);
+ owner = page_get_owner_and_reference(page);
+- if ( !owner )
++ if ( !owner || !owner->grant_table )
+ {
+ rcu_unlock_domain(d);
+ return -EPERM;
Added: head/emulators/xen-kernel/files/xsa233.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/emulators/xen-kernel/files/xsa233.patch Tue Sep 19 12:56:50 2017 (r450121)
@@ -0,0 +1,52 @@
+From: Juergen Gross <jgross at suse.com>
+Subject: tools/xenstore: dont unlink connection object twice
+
+A connection object of a domain with associated stubdom has two
+parents: the domain and the stubdom. When cleaning up the list of
+active domains in domain_cleanup() make sure not to unlink the
+connection twice from the same domain. This could happen when the
+domain and its stubdom are being destroyed at the same time leading
+to the domain loop being entered twice.
+
+Additionally don't use talloc_free() in this case as it will remove
+a random parent link, leading eventually to a memory leak. Use
+talloc_unlink() instead specifying the context from which the
+connection object should be removed.
+
+This is XSA-233.
+
+Reported-by: Eric Chanudet <chanudete at ainfosec.com>
+Signed-off-by: Juergen Gross <jgross at suse.com>
+Reviewed-by: Ian Jackson <ian.jackson at eu.citrix.com>
+
+--- a/tools/xenstore/xenstored_domain.c
++++ b/tools/xenstore/xenstored_domain.c
+@@ -221,10 +221,11 @@ static int destroy_domain(void *_domain)
+ static void domain_cleanup(void)
+ {
+ xc_dominfo_t dominfo;
+- struct domain *domain, *tmp;
++ struct domain *domain;
+ int notify = 0;
+
+- list_for_each_entry_safe(domain, tmp, &domains, list) {
++ again:
++ list_for_each_entry(domain, &domains, list) {
+ if (xc_domain_getinfo(*xc_handle, domain->domid, 1,
+ &dominfo) == 1 &&
+ dominfo.domid == domain->domid) {
+@@ -236,8 +237,12 @@ static void domain_cleanup(void)
+ if (!dominfo.dying)
+ continue;
+ }
+- talloc_free(domain->conn);
+- notify = 0; /* destroy_domain() fires the watch */
++ if (domain->conn) {
++ talloc_unlink(talloc_autofree_context(), domain->conn);
++ domain->conn = NULL;
++ notify = 0; /* destroy_domain() fires the watch */
++ goto again;
++ }
+ }
+
+ if (notify)
Added: head/emulators/xen-kernel/files/xsa234-4.8.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/emulators/xen-kernel/files/xsa234-4.8.patch Tue Sep 19 12:56:50 2017 (r450121)
@@ -0,0 +1,185 @@
+From: Jan Beulich <jbeulich at suse.com>
+Subject: gnttab: also validate PTE permissions upon destroy/replace
+
+In order for PTE handling to match up with the reference counting done
+by common code, presence and writability of grant mapping PTEs must
+also be taken into account; validating just the frame number is not
+enough. This is in particular relevant if a guest fiddles with grant
+PTEs via non-grant hypercalls.
+
+Note that the flags being passed to replace_grant_host_mapping()
+already happen to be those of the existing mapping, so no new function
+parameter is needed.
+
+This is XSA-234.
+
+Reported-by: Andrew Cooper <andrew.cooper3 at citrix.com>
+Signed-off-by: Jan Beulich <jbeulich at suse.com>
+Reviewed-by: Andrew Cooper <andrew.cooper3 at citrix.com>
+
+--- a/xen/arch/x86/mm.c
++++ b/xen/arch/x86/mm.c
+@@ -4017,7 +4017,8 @@ static int create_grant_pte_mapping(
+ }
+
+ static int destroy_grant_pte_mapping(
+- uint64_t addr, unsigned long frame, struct domain *d)
++ uint64_t addr, unsigned long frame, unsigned int grant_pte_flags,
++ struct domain *d)
+ {
+ int rc = GNTST_okay;
+ void *va;
+@@ -4063,16 +4064,27 @@ static int destroy_grant_pte_mapping(
+
+ ol1e = *(l1_pgentry_t *)va;
+
+- /* Check that the virtual address supplied is actually mapped to frame. */
+- if ( unlikely(l1e_get_pfn(ol1e) != frame) )
++ /*
++ * Check that the PTE supplied actually maps frame (with appropriate
++ * permissions).
++ */
++ if ( unlikely(l1e_get_pfn(ol1e) != frame) ||
++ unlikely((l1e_get_flags(ol1e) ^ grant_pte_flags) &
++ (_PAGE_PRESENT | _PAGE_RW)) )
+ {
+ page_unlock(page);
+- MEM_LOG("PTE entry %lx for address %"PRIx64" doesn't match frame %lx",
+- (unsigned long)l1e_get_intpte(ol1e), addr, frame);
++ MEM_LOG("PTE %"PRIpte" at %"PRIx64" doesn't match grant (%"PRIpte")",
++ l1e_get_intpte(ol1e), addr,
++ l1e_get_intpte(l1e_from_pfn(frame, grant_pte_flags)));
+ rc = GNTST_general_error;
+ goto failed;
+ }
+
++ if ( unlikely((l1e_get_flags(ol1e) ^ grant_pte_flags) &
++ ~(_PAGE_AVAIL | PAGE_CACHE_ATTRS)) )
++ MEM_LOG("PTE flags %x at %"PRIx64" don't match grant (%x)\n",
++ l1e_get_flags(ol1e), addr, grant_pte_flags);
++
+ /* Delete pagetable entry. */
+ if ( unlikely(!UPDATE_ENTRY
+ (l1,
+@@ -4081,7 +4093,7 @@ static int destroy_grant_pte_mapping(
+ 0)) )
+ {
+ page_unlock(page);
+- MEM_LOG("Cannot delete PTE entry at %p", va);
++ MEM_LOG("Cannot delete PTE entry at %"PRIx64, addr);
+ rc = GNTST_general_error;
+ goto failed;
+ }
+@@ -4149,7 +4161,8 @@ static int create_grant_va_mapping(
+ }
+
+ static int replace_grant_va_mapping(
+- unsigned long addr, unsigned long frame, l1_pgentry_t nl1e, struct vcpu *v)
++ unsigned long addr, unsigned long frame, unsigned int grant_pte_flags,
++ l1_pgentry_t nl1e, struct vcpu *v)
+ {
+ l1_pgentry_t *pl1e, ol1e;
+ unsigned long gl1mfn;
+@@ -4185,19 +4198,30 @@ static int replace_grant_va_mapping(
+
+ ol1e = *pl1e;
+
+- /* Check that the virtual address supplied is actually mapped to frame. */
+- if ( unlikely(l1e_get_pfn(ol1e) != frame) )
+- {
+- MEM_LOG("PTE entry %lx for address %lx doesn't match frame %lx",
+- l1e_get_pfn(ol1e), addr, frame);
++ /*
++ * Check that the virtual address supplied is actually mapped to frame
++ * (with appropriate permissions).
++ */
++ if ( unlikely(l1e_get_pfn(ol1e) != frame) ||
++ unlikely((l1e_get_flags(ol1e) ^ grant_pte_flags) &
++ (_PAGE_PRESENT | _PAGE_RW)) )
++ {
++ MEM_LOG("PTE %"PRIpte" for %lx doesn't match grant (%"PRIpte")",
++ l1e_get_intpte(ol1e), addr,
++ l1e_get_intpte(l1e_from_pfn(frame, grant_pte_flags)));
+ rc = GNTST_general_error;
+ goto unlock_and_out;
+ }
+
++ if ( unlikely((l1e_get_flags(ol1e) ^ grant_pte_flags) &
++ ~(_PAGE_AVAIL | PAGE_CACHE_ATTRS)) )
++ MEM_LOG("PTE flags %x for %"PRIx64" don't match grant (%x)",
++ l1e_get_flags(ol1e), addr, grant_pte_flags);
++
+ /* Delete pagetable entry. */
+ if ( unlikely(!UPDATE_ENTRY(l1, pl1e, ol1e, nl1e, gl1mfn, v, 0)) )
+ {
+- MEM_LOG("Cannot delete PTE entry at %p", (unsigned long *)pl1e);
++ MEM_LOG("Cannot delete PTE entry for %"PRIx64, addr);
+ rc = GNTST_general_error;
+ goto unlock_and_out;
+ }
+@@ -4211,9 +4235,11 @@ static int replace_grant_va_mapping(
+ }
+
+ static int destroy_grant_va_mapping(
+- unsigned long addr, unsigned long frame, struct vcpu *v)
++ unsigned long addr, unsigned long frame, unsigned int grant_pte_flags,
++ struct vcpu *v)
+ {
+- return replace_grant_va_mapping(addr, frame, l1e_empty(), v);
++ return replace_grant_va_mapping(addr, frame, grant_pte_flags,
++ l1e_empty(), v);
+ }
+
+ static int create_grant_p2m_mapping(uint64_t addr, unsigned long frame,
+@@ -4307,21 +4333,40 @@ int replace_grant_host_mapping(
+ unsigned long gl1mfn;
+ struct page_info *l1pg;
+ int rc;
++ unsigned int grant_pte_flags;
+
+ if ( paging_mode_external(current->domain) )
+ return replace_grant_p2m_mapping(addr, frame, new_addr, flags);
+
++ grant_pte_flags =
++ _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_GNTTAB | _PAGE_NX;
++
++ if ( flags & GNTMAP_application_map )
++ grant_pte_flags |= _PAGE_USER;
++ if ( !(flags & GNTMAP_readonly) )
++ grant_pte_flags |= _PAGE_RW;
++ /*
++ * On top of the explicit settings done by create_grant_host_mapping()
++ * also open-code relevant parts of adjust_guest_l1e(). Don't mirror
++ * available and cachability flags, though.
++ */
++ if ( !is_pv_32bit_domain(curr->domain) )
++ grant_pte_flags |= (grant_pte_flags & _PAGE_USER)
++ ? _PAGE_GLOBAL
++ : _PAGE_GUEST_KERNEL | _PAGE_USER;
++
+ if ( flags & GNTMAP_contains_pte )
+ {
+ if ( !new_addr )
+- return destroy_grant_pte_mapping(addr, frame, curr->domain);
++ return destroy_grant_pte_mapping(addr, frame, grant_pte_flags,
++ curr->domain);
+
+ MEM_LOG("Unsupported grant table operation");
+ return GNTST_general_error;
+ }
+
+ if ( !new_addr )
+- return destroy_grant_va_mapping(addr, frame, curr);
++ return destroy_grant_va_mapping(addr, frame, grant_pte_flags, curr);
+
+ pl1e = guest_map_l1e(new_addr, &gl1mfn);
+ if ( !pl1e )
+@@ -4369,7 +4414,7 @@ int replace_grant_host_mapping(
+ put_page(l1pg);
+ guest_unmap_l1e(pl1e);
+
+- rc = replace_grant_va_mapping(addr, frame, ol1e, curr);
++ rc = replace_grant_va_mapping(addr, frame, grant_pte_flags, ol1e, curr);
+ if ( rc && !paging_mode_refcounts(curr->domain) )
+ put_page_from_l1e(ol1e, curr->domain);
+
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