modify acquire_domstatic_pages to take an unsigned int size parameter

acquire_domstatic_pages currently takes an unsigned long nr_mfns
parameter, but actually it cannot handle anything larger than an
unsigned int nr_mfns. That's because acquire_domstatic_pages is based on
assign_pages which also takes an unsigned int nr parameter.

So modify the nr_mfns parameter of acquire_domstatic_pages to be
unsigned int.

There is only one caller in
xen/arch/arm/domain_build.c:allocate_static_memory. Check that the value
to be passed to acquire_domstatic_pages is no larger than UINT_MAX. If
it is, print an error and goto fail.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 62ab7d0eadeb524ef72c99da5a867d9dd3e0d4e0..d233d634c11271b33e72a19f71c48e834f35e986 100644 (file)
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -554,6 +554,12 @@ static void __init allocate_static_memory(struct domain *d,
         device_tree_get_reg(&cell, addr_cells, size_cells, &pbase, &psize);
         ASSERT(IS_ALIGNED(pbase, PAGE_SIZE) && IS_ALIGNED(psize, PAGE_SIZE));
 
+        if ( PFN_DOWN(psize) > UINT_MAX )
+        {
+            printk(XENLOG_ERR "%pd: static memory size too large: %#"PRIpaddr,
+                   d, psize);
+            goto fail;
+        }
         smfn = maddr_to_mfn(pbase);
         res = acquire_domstatic_pages(d, smfn, PFN_DOWN(psize), 0);
         if ( res )

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index b9441cb06fe422adfc1b25f6ebaba2a8911eab58..b64c07ae927ba8898efd8dd0f60ba7d6a80ff90d 100644 (file)
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -2714,7 +2714,7 @@ static struct page_info * __init acquire_staticmem_pages(mfn_t smfn,
  * then assign them to one specific domain #d.
  */
 int __init acquire_domstatic_pages(struct domain *d, mfn_t smfn,
-                                   unsigned long nr_mfns, unsigned int memflags)
+                                   unsigned int nr_mfns, unsigned int memflags)
 {
     struct page_info *pg;
 

diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index dd49237e866b5990a48b68c775a9b94e437a7809..5db26ed477f6d8f2a7e29060b2e09f6c456a2c13 100644 (file)
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -89,7 +89,7 @@ bool scrub_free_pages(void);
 /* These functions are for static memory */
 void free_staticmem_pages(struct page_info *pg, unsigned long nr_mfns,
                           bool need_scrub);
-int acquire_domstatic_pages(struct domain *d, mfn_t smfn, unsigned long nr_mfns,
+int acquire_domstatic_pages(struct domain *d, mfn_t smfn, unsigned int nr_mfns,
                             unsigned int memflags);
 #endif