Commit 0160676b authored by David Vrabel's avatar David Vrabel Committed by Konrad Rzeszutek Wilk
Browse files

xen/p2m: check MFN is in range before using the m2p table 



On hosts with more than 168 GB of memory, a 32-bit guest may attempt
to grant map an MFN that is error cannot lookup in its mapping of the
m2p table.  There is an m2p lookup as part of m2p_add_override() and
m2p_remove_override().  The lookup falls off the end of the mapped
portion of the m2p and (because the mapping is at the highest virtual
address) wraps around and the lookup causes a fault on what appears to
be a user space address.

do_page_fault() (thinking it's a fault to a userspace address), tries
to lock mm->mmap_sem.  If the gntdev device is used for the grant map,
m2p_add_override() is called from from gnttab_mmap() with mm->mmap_sem
already locked.  do_page_fault() then deadlocks.

The deadlock would most commonly occur when a 64-bit guest is started
and xenconsoled attempts to grant map its console ring.

Introduce mfn_to_pfn_no_overrides() which checks the MFN is within the
mapped portion of the m2p table before accessing the table and use
this in m2p_add_override(), m2p_remove_override(), and mfn_to_pfn()
(which already had the correct range check).

All faults caused by accessing the non-existant parts of the m2p are
thus within the kernel address space and exception_fixup() is called
without trying to lock mm->mmap_sem.

This means that for MFNs that are outside the mapped range of the m2p
then mfn_to_pfn() will always look in the m2p overrides.  This is
correct because it must be a foreign MFN (and the PFN in the m2p in
this case is only relevant for the other domain).

Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@citrix.com>
Cc: Jan Beulich <JBeulich@suse.com>
--
v3: check for auto_translated_physmap in mfn_to_pfn_no_overrides()
v2: in mfn_to_pfn() look in m2p_overrides if the MFN is out of
    range as it's probably foreign.
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
parent 24f69373

arch/x86/include/asm/xen/page.h

+20 −11
Original line number Diff line number Diff line
@@ -79,30 +79,38 @@ static inline int phys_to_machine_mapping_valid(unsigned long pfn) 
	return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY;

}



static inline unsigned long mfn_to_pfn(unsigned long mfn)

static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)

{

	unsigned long pfn;

	int ret = 0;

	int ret;



	if (xen_feature(XENFEAT_auto_translated_physmap))

		return mfn;



	if (unlikely(mfn >= machine_to_phys_nr)) {

		pfn = ~0;

		goto try_override;

	}

	pfn = 0;

	if (unlikely(mfn >= machine_to_phys_nr))

		return ~0;



	/*

	 * The array access can fail (e.g., device space beyond end of RAM).

	 * In such cases it doesn't matter what we return (we return garbage),

	 * but we must handle the fault without crashing!

	 */

	ret = __get_user(pfn, &machine_to_phys_mapping[mfn]);

try_override:

	/* ret might be < 0 if there are no entries in the m2p for mfn */

	if (ret < 0)

		pfn = ~0;

	else if (get_phys_to_machine(pfn) != mfn)

		return ~0;



	return pfn;

}



static inline unsigned long mfn_to_pfn(unsigned long mfn)

{

	unsigned long pfn;



	if (xen_feature(XENFEAT_auto_translated_physmap))

		return mfn;



	pfn = mfn_to_pfn_no_overrides(mfn);

	if (get_phys_to_machine(pfn) != mfn) {

		/*

		 * If this appears to be a foreign mfn (because the pfn

		 * doesn't map back to the mfn), then check the local override
@@ -111,6 +119,7 @@ try_override: 
		 * m2p_find_override_pfn returns ~0 if it doesn't find anything.

		 */

		pfn = m2p_find_override_pfn(mfn, ~0);

	}



	/* 

	 * pfn is ~0 if there are no entries in the m2p for mfn or if the

arch/x86/xen/p2m.c

+4 −6
Original line number Diff line number Diff line
@@ -879,7 +879,6 @@ int m2p_add_override(unsigned long mfn, struct page *page, 
	unsigned long uninitialized_var(address);

	unsigned level;

	pte_t *ptep = NULL;

	int ret = 0;



	pfn = page_to_pfn(page);

	if (!PageHighMem(page)) {
@@ -926,8 +925,8 @@ int m2p_add_override(unsigned long mfn, struct page *page, 
	 * frontend pages while they are being shared with the backend,

	 * because mfn_to_pfn (that ends up being called by GUPF) will

	 * return the backend pfn rather than the frontend pfn. */

	ret = __get_user(pfn, &machine_to_phys_mapping[mfn]);

	if (ret == 0 && get_phys_to_machine(pfn) == mfn)

	pfn = mfn_to_pfn_no_overrides(mfn);

	if (get_phys_to_machine(pfn) == mfn)

		set_phys_to_machine(pfn, FOREIGN_FRAME(mfn));



	return 0;
@@ -942,7 +941,6 @@ int m2p_remove_override(struct page *page, 
	unsigned long uninitialized_var(address);

	unsigned level;

	pte_t *ptep = NULL;

	int ret = 0;



	pfn = page_to_pfn(page);

	mfn = get_phys_to_machine(pfn);
@@ -1029,8 +1027,8 @@ int m2p_remove_override(struct page *page, 
	 * the original pfn causes mfn_to_pfn(mfn) to return the frontend

	 * pfn again. */

	mfn &= ~FOREIGN_FRAME_BIT;

	ret = __get_user(pfn, &machine_to_phys_mapping[mfn]);

	if (ret == 0 && get_phys_to_machine(pfn) == FOREIGN_FRAME(mfn) &&

	pfn = mfn_to_pfn_no_overrides(mfn);

	if (get_phys_to_machine(pfn) == FOREIGN_FRAME(mfn) &&

			m2p_find_override(mfn) == NULL)

		set_phys_to_machine(pfn, mfn);

CRA Git | Maintained and supported by SUSTech CRA and CCSE