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Kernel: Fix mmap with specific address for file backed mappings

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Itamar 2020-12-16 20:52:47 +02:00 committed by Andreas Kling
parent 79818bbf8e
commit d64d0451e5
Notes: sideshowbarker 2024-07-19 00:37:45 +09:00 
Author: https://github.com/itamar8910
Commit: https://github.com/SerenityOS/serenity/commit/d64d0451e56
1 changed files with 10 additions and 6 deletions
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16
Kernel/Syscalls/mmap.cpp
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@ -133,18 +133,22 @@ 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.is_valid())
return (void*)-ENOMEM;
Optional<Range> range;
if (map_purgeable || map_anonymous) {
range = allocate_range(VirtualAddress(addr), size, alignment);
if (!range.value().is_valid())
return (void*)-ENOMEM;
}
if (map_purgeable) {
auto vmobject = PurgeableVMObject::create_with_size(size);
region = allocate_region_with_vmobject(range, vmobject, 0, !name.is_null() ? name : "mmap (purgeable)", prot);
region = allocate_region_with_vmobject(range.value(), vmobject, 0, !name.is_null() ? name : "mmap (purgeable)", prot);
if (!region && (!map_fixed && addr != 0))
region = allocate_region_with_vmobject({}, size, vmobject, 0, !name.is_null() ? name : "mmap (purgeable)", prot);
} else if (map_anonymous) {
region = allocate_region(range, !name.is_null() ? name : "mmap", prot, false);
region = allocate_region(range.value(), !name.is_null() ? name : "mmap", prot, false);
if (!region && (!map_fixed && addr != 0))
region = allocate_region(allocate_range({}, size), !name.is_null() ? name : "mmap", prot, false);
} else {