mirror of
https://github.com/RGBCube/serenity
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e1476788ad
This fixes an issue where a sharing process would map the "lazy
committed page" early and then get stuck with that page even after
it had been replaced in the VMObject by a page fault.
Regressed in 27c1135d30, which made it
happen every time with the backing bitmaps used for WebContent.
44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/AnonymousFile.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$anon_create(size_t size, int options)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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if (!size)
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return EINVAL;
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if (size % PAGE_SIZE)
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return EINVAL;
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if (size > NumericLimits<ssize_t>::max())
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return EINVAL;
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auto new_fd = TRY(allocate_fd());
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auto vmobject = TRY(Memory::AnonymousVMObject::try_create_purgeable_with_size(size, AllocationStrategy::AllocateNow));
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auto anon_file = TRY(AnonymousFile::try_create(move(vmobject)));
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auto description = TRY(OpenFileDescription::try_create(move(anon_file)));
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description->set_writable(true);
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description->set_readable(true);
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u32 fd_flags = 0;
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if (options & O_CLOEXEC)
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fd_flags |= FD_CLOEXEC;
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m_fds.with_exclusive([&](auto& fds) { fds[new_fd.fd].set(move(description), fd_flags); });
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return new_fd.fd;
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}
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}
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