diff options
Diffstat (limited to 'Kernel')
| -rw-r--r-- | Kernel/Syscalls/mmap.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp index b380858300..6f6c04e459 100644 --- a/Kernel/Syscalls/mmap.cpp +++ b/Kernel/Syscalls/mmap.cpp @@ -469,11 +469,17 @@ void* Process::sys$mremap(Userspace<const Syscall::SC_mremap_params*> user_param { REQUIRE_PROMISE(stdio); - Syscall::SC_mremap_params params; + Syscall::SC_mremap_params params {}; if (!copy_from_user(¶ms, user_params)) return (void*)-EFAULT; - auto* old_region = space().find_region_from_range(Range { VirtualAddress(params.old_address), params.old_size }); + if (page_round_up_would_wrap(params.old_size)) + return (void*)-EINVAL; + + auto old_address = page_round_down(params.old_address); + auto old_size = page_round_up(params.old_size); + + auto* old_region = space().find_region_from_range(Range { VirtualAddress { old_address }, old_size }); if (!old_region) return (void*)-EINVAL; |