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Kernel: Return EEXIST in VirtualRangeAllocator::try_allocate_specific()

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This error only ever gets propagated to the userspace if
MAP_FIXED_NOREPLACE is requested, as MAP_FIXED unmaps intersecting
ranges beforehand, and non-fixed mmap() calls will just fall back to
allocating anywhere.

Linux specifies MAP_FIXED_NOREPLACE to return EEXIST when it can't
allocate, we now match that behavior.
This commit is contained in:
Daniel Bertalan 2021-12-22 12:15:55 +01:00 • committed by Andreas Kling
commit 4195a7ef4b
Notes: sideshowbarker 2024-07-17 22:19:33 +09:00
1 changed files with 2 additions and 2 deletions
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4
Kernel/Memory/VirtualRangeAllocator.cpp
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@ -146,9 +146,9 @@ ErrorOr<VirtualRange> VirtualRangeAllocator::try_allocate_specific(VirtualAddres
SpinlockLocker lock(m_lock);
auto available_range = m_available_ranges.find_largest_not_above(base.get());
if (!available_range)
return ENOMEM;
return EEXIST;
if (!available_range->contains(allocated_range))
return ENOMEM;
return EEXIST;
if (*available_range == allocated_range) {
m_available_ranges.remove(available_range->base().get());
return allocated_range;