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Kernel: Propagate overflow errors from Memory::page_round_up

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Fixes #11402.
This commit is contained in:
Guilherme Goncalves 2021-12-24 11:22:11 -03:00 • committed by Andreas Kling
parent 11599a3342
commit 33b78915d3
31 changed files with 112 additions and 100 deletions
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20
Kernel/Syscalls/mmap.cpp
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@ -142,10 +142,8 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> use
if (alignment & ~PAGE_MASK)
return EINVAL;
if (Memory::page_round_up_would_wrap(size))
return EINVAL;
if (!Memory::is_user_range(VirtualAddress(addr), Memory::page_round_up(size)))
size_t rounded_size = TRY(Memory::page_round_up(size));
if (!Memory::is_user_range(VirtualAddress(addr), rounded_size))
return EFAULT;
OwnPtr<KString> name;
@ -188,7 +186,7 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> use
auto range = TRY([&]() -> ErrorOr<Memory::VirtualRange> {
if (map_randomized)
return address_space().page_directory().range_allocator().try_allocate_randomized(Memory::page_round_up(size), alignment);
return address_space().page_directory().range_allocator().try_allocate_randomized(rounded_size, alignment);
// If MAP_FIXED is specified, existing mappings that intersect the requested range are removed.
if (map_fixed)
@ -208,9 +206,9 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> use
auto strategy = map_noreserve ? AllocationStrategy::None : AllocationStrategy::Reserve;
RefPtr<Memory::AnonymousVMObject> vmobject;
if (flags & MAP_PURGEABLE) {
vmobject = TRY(Memory::AnonymousVMObject::try_create_purgeable_with_size(Memory::page_round_up(size), strategy));
vmobject = TRY(Memory::AnonymousVMObject::try_create_purgeable_with_size(rounded_size, strategy));
} else {
vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(Memory::page_round_up(size), strategy));
vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(rounded_size, strategy));
}
region = TRY(address_space().allocate_region_with_vmobject(range, vmobject.release_nonnull(), 0, {}, prot, map_shared));
@ -587,15 +585,11 @@ ErrorOr<FlatPtr> Process::sys$msync(Userspace<void*> address, size_t size, int f
if (address.ptr() % PAGE_SIZE != 0)
return EINVAL;
if (Memory::page_round_up_would_wrap(size)) {
return EINVAL;
}
// Note: This is not specified
size = Memory::page_round_up(size);
auto rounded_size = TRY(Memory::page_round_up(size));
// FIXME: We probably want to sync all mappings in the address+size range.
auto* region = address_space().find_region_containing(Memory::VirtualRange { address.vaddr(), size });
auto* region = address_space().find_region_containing(Memory::VirtualRange { address.vaddr(), rounded_size });
// All regions from address upto address+size shall be mapped
if (!region)
return ENOMEM;