Differential D40743 Diff 123804 sys/vm/vm_map.c

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sys/vm/vm_map.c

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static const int aslr_pages_rnd_32[2] = {0x100, 0x4};		static const int aslr_pages_rnd_32[2] = {0x100, 0x4};

static int cluster_anon = 1;		static int cluster_anon = 1;
SYSCTL_INT(_vm, OID_AUTO, cluster_anon, CTLFLAG_RW,		SYSCTL_INT(_vm, OID_AUTO, cluster_anon, CTLFLAG_RW,
&cluster_anon, 0,		&cluster_anon, 0,
"Cluster anonymous mappings: 0 = no, 1 = yes if no hint, 2 = always");		"Cluster anonymous mappings: 0 = no, 1 = yes if no hint, 2 = always");

static bool		static bool
clustering_anon_allowed(vm_offset_t addr)		clustering_anon_allowed(vm_offset_t addr, int cow)
{		{

switch (cluster_anon) {		switch (cluster_anon) {
case 0:		case 0:
return (false);		return (false);
case 1:		case 1:
return (addr == 0);		return (addr == 0 \|\| (cow & MAP_NO_HINT) != 0);
case 2:		case 2:
default:		default:
return (true);		return (true);
}		}
}		}

static long aslr_restarts;		static long aslr_restarts;
SYSCTL_LONG(_vm, OID_AUTO, aslr_restarts, CTLFLAG_RD,		SYSCTL_LONG(_vm, OID_AUTO, aslr_restarts, CTLFLAG_RD,
▲ Show 20 Lines • Show All 106 Lines • ▼ Show 20 Lines	if (find_space == VMFS_OPTIMAL_SPACE && (object == NULL \|\|
(object->flags & OBJ_COLORED) == 0))		(object->flags & OBJ_COLORED) == 0))
find_space = VMFS_ANY_SPACE;		find_space = VMFS_ANY_SPACE;
if (find_space >> 8 != 0) {		if (find_space >> 8 != 0) {
KASSERT((find_space & 0xff) == 0, ("bad VMFS flags"));		KASSERT((find_space & 0xff) == 0, ("bad VMFS flags"));
alignment = (vm_offset_t)1 << (find_space >> 8);		alignment = (vm_offset_t)1 << (find_space >> 8);
} else		} else
alignment = 0;		alignment = 0;
en_aslr = (map->flags & MAP_ASLR) != 0;		en_aslr = (map->flags & MAP_ASLR) != 0;
update_anon = cluster = clustering_anon_allowed(*addr) &&		update_anon = cluster = clustering_anon_allowed(*addr, cow) &&
(map->flags & MAP_IS_SUB_MAP) == 0 && max_addr == 0 &&		(map->flags & MAP_IS_SUB_MAP) == 0 && max_addr == 0 &&
find_space != VMFS_NO_SPACE && object == NULL &&		find_space != VMFS_NO_SPACE && object == NULL &&
(cow & (MAP_INHERIT_SHARE \| MAP_STACK_GROWS_UP \|		(cow & (MAP_INHERIT_SHARE \| MAP_STACK_GROWS_UP \|
MAP_STACK_GROWS_DOWN)) == 0 && prot != PROT_NONE;		MAP_STACK_GROWS_DOWN)) == 0 && prot != PROT_NONE;
curr_min_addr = min_addr = *addr;		curr_min_addr = min_addr = *addr;
if (en_aslr && min_addr == 0 && !cluster &&		if (en_aslr && min_addr == 0 && !cluster &&
find_space != VMFS_NO_SPACE &&		find_space != VMFS_NO_SPACE &&
(map->flags & MAP_ASLR_IGNSTART) != 0)		(map->flags & MAP_ASLR_IGNSTART) != 0)
▲ Show 20 Lines • Show All 127 Lines • ▼ Show 20 Lines	vm_map_find_min(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
vm_offset_t *addr, vm_size_t length, vm_offset_t min_addr,		vm_offset_t *addr, vm_size_t length, vm_offset_t min_addr,
vm_offset_t max_addr, int find_space, vm_prot_t prot, vm_prot_t max,		vm_offset_t max_addr, int find_space, vm_prot_t prot, vm_prot_t max,
int cow)		int cow)
{		{
vm_offset_t hint;		vm_offset_t hint;
int rv;		int rv;

hint = *addr;		hint = *addr;
		if (hint == 0)
		cow \|= MAP_NO_HINT;
		if (hint < min_addr)
		*addr = hint = min_addr;
for (;;) {		for (;;) {
rv = vm_map_find(map, object, offset, addr, length, max_addr,		rv = vm_map_find(map, object, offset, addr, length, max_addr,
find_space, prot, max, cow);		find_space, prot, max, cow);
if (rv == KERN_SUCCESS \|\| min_addr >= hint)		if (rv == KERN_SUCCESS \|\| min_addr >= hint)
return (rv);		return (rv);
*addr = hint = min_addr;		*addr = hint = min_addr;
}		}
}		}
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