summaryrefslogtreecommitdiff
path: root/sys/uvm/uvm_map.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/uvm/uvm_map.c')
-rw-r--r--sys/uvm/uvm_map.c34
1 files changed, 1 insertions, 33 deletions
diff --git a/sys/uvm/uvm_map.c b/sys/uvm/uvm_map.c
index 0581a3d0660..6338052d0b6 100644
--- a/sys/uvm/uvm_map.c
+++ b/sys/uvm/uvm_map.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: uvm_map.c,v 1.293 2022/08/15 03:12:12 jsg Exp $ */
+/* $OpenBSD: uvm_map.c,v 1.294 2022/08/15 15:53:45 jsg Exp $ */
/* $NetBSD: uvm_map.c,v 1.86 2000/11/27 08:40:03 chs Exp $ */
/*
@@ -230,38 +230,6 @@ void vmspace_validate(struct vm_map*);
#define VM_MAP_KSIZE_INIT (512 * (vaddr_t)PAGE_SIZE)
#define VM_MAP_KSIZE_DELTA (256 * (vaddr_t)PAGE_SIZE)
#define VM_MAP_KSIZE_ALLOCMUL 4
-/*
- * When selecting a random free-space block, look at most FSPACE_DELTA blocks
- * ahead.
- */
-#define FSPACE_DELTA 8
-/*
- * Put allocations adjecent to previous allocations when the free-space tree
- * is larger than FSPACE_COMPACT entries.
- *
- * Alignment and PMAP_PREFER may still cause the entry to not be fully
- * adjecent. Note that this strategy reduces memory fragmentation (by leaving
- * a large space before or after the allocation).
- */
-#define FSPACE_COMPACT 128
-/*
- * Make the address selection skip at most this many bytes from the start of
- * the free space in which the allocation takes place.
- *
- * The main idea behind a randomized address space is that an attacker cannot
- * know where to target his attack. Therefore, the location of objects must be
- * as random as possible. However, the goal is not to create the most sparse
- * map that is possible.
- * FSPACE_MAXOFF pushes the considered range in bytes down to less insane
- * sizes, thereby reducing the sparseness. The biggest randomization comes
- * from fragmentation, i.e. FSPACE_COMPACT.
- */
-#define FSPACE_MAXOFF ((vaddr_t)32 * 1024 * 1024)
-/*
- * Allow for small gaps in the overflow areas.
- * Gap size is in bytes and does not have to be a multiple of page-size.
- */
-#define FSPACE_BIASGAP ((vaddr_t)32 * 1024)
/* auto-allocate address lower bound */
#define VMMAP_MIN_ADDR PAGE_SIZE