diff options
Diffstat (limited to 'Kernel/Syscalls/mmap.cpp')
| -rw-r--r-- | Kernel/Syscalls/mmap.cpp | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp index aa555b71f3..be1ebdf818 100644 --- a/Kernel/Syscalls/mmap.cpp +++ b/Kernel/Syscalls/mmap.cpp @@ -119,6 +119,7 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params) bool map_stack = flags & MAP_STACK; bool map_fixed = flags & MAP_FIXED; bool map_noreserve = flags & MAP_NORESERVE; + bool map_randomized = flags & MAP_RANDOMIZED; if (map_shared && map_private) return (void*)-EINVAL; @@ -133,16 +134,23 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params) return (void*)-EINVAL; Region* region = nullptr; - auto range = allocate_range(VirtualAddress(addr), size, alignment); - if (!range.has_value()) { - if (addr && !map_fixed) { - // If there's an address but MAP_FIXED wasn't specified, the address is just a hint. - range = allocate_range({}, size, alignment); + Optional<Range> range; + + if (map_randomized) { + range = page_directory().range_allocator().allocate_randomized(size, alignment); + } else { + range = allocate_range(VirtualAddress(addr), size, alignment); + if (!range.has_value()) { + if (addr && !map_fixed) { + // If there's an address but MAP_FIXED wasn't specified, the address is just a hint. + range = allocate_range({}, size, alignment); + } } - if (!range.has_value()) - return (void*)-ENOMEM; } + if (!range.has_value()) + return (void*)-ENOMEM; + if (map_anonymous) { auto strategy = map_noreserve ? AllocationStrategy::None : AllocationStrategy::Reserve; auto region_or_error = allocate_region(range.value(), !name.is_null() ? name : "mmap", prot, strategy); |