diff options
Diffstat (limited to 'sys/vm/vm_mmap.c')
| -rw-r--r-- | sys/vm/vm_mmap.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c index 325421fcafe3..4d8f6ad9ed7e 100644 --- a/sys/vm/vm_mmap.c +++ b/sys/vm/vm_mmap.c @@ -226,7 +226,7 @@ kern_mmap(struct thread *td, uintptr_t addr0, size_t size, int prot, int flags, } if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_HASSEMAPHORE | MAP_STACK | MAP_NOSYNC | MAP_ANON | MAP_EXCL | MAP_NOCORE | - MAP_PREFAULT_READ | + MAP_PREFAULT_READ | MAP_GUARD | #ifdef MAP_32BIT MAP_32BIT | #endif @@ -239,6 +239,10 @@ kern_mmap(struct thread *td, uintptr_t addr0, size_t size, int prot, int flags, if (prot != PROT_NONE && (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0) return (EINVAL); + if ((flags & MAP_GUARD) != 0 && (prot != PROT_NONE || fd != -1 || + pos != 0 || (flags & (MAP_SHARED | MAP_PRIVATE | MAP_PREFAULT | + MAP_PREFAULT_READ | MAP_ANON | MAP_STACK)) != 0)) + return (EINVAL); /* * Align the file position to a page boundary, @@ -314,7 +318,10 @@ kern_mmap(struct thread *td, uintptr_t addr0, size_t size, int prot, int flags, * returns an error earlier. */ error = 0; - } else if (flags & MAP_ANON) { + } else if ((flags & MAP_GUARD) != 0) { + error = vm_mmap_object(&vms->vm_map, &addr, size, VM_PROT_NONE, + VM_PROT_NONE, flags, NULL, pos, FALSE, td); + } else if ((flags & MAP_ANON) != 0) { /* * Mapping blank space is trivial. * @@ -1511,6 +1518,8 @@ vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, } if ((flags & MAP_EXCL) != 0) docow |= MAP_CHECK_EXCL; + if ((flags & MAP_GUARD) != 0) + docow |= MAP_CREATE_GUARD; if (fitit) { if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER) |