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https://github.com/SerenityOS/serenity
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2a2e76c802
A lot of software relies on the fact that mmap and shbuf memory is zeroed out by the kernel, so we should consider it initialized from the shadow bit perspective as well.
120 lines
3.9 KiB
C++
120 lines
3.9 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "SharedBufferRegion.h"
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#include "Emulator.h"
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#include <Kernel/API/Syscall.h>
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#include <serenity.h>
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#include <string.h>
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#include <sys/mman.h>
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namespace UserspaceEmulator {
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NonnullOwnPtr<SharedBufferRegion> SharedBufferRegion::create_with_shbuf_id(u32 base, u32 size, int shbuf_id, u8* host_data)
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{
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return adopt_own(*new SharedBufferRegion(base, size, shbuf_id, host_data));
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}
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SharedBufferRegion::SharedBufferRegion(u32 base, u32 size, int shbuf_id, u8* host_data)
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: Region(base, size)
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, m_data(host_data)
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, m_shbuf_id(shbuf_id)
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{
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m_shadow_data = (u8*)malloc(size);
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memset(m_shadow_data, 1, size);
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}
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SharedBufferRegion::~SharedBufferRegion()
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{
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free(m_shadow_data);
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}
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ValueWithShadow<u8> SharedBufferRegion::read8(FlatPtr offset)
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{
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ASSERT(offset < size());
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return { *reinterpret_cast<const u8*>(m_data + offset), *reinterpret_cast<const u8*>(m_shadow_data + offset) };
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}
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ValueWithShadow<u16> SharedBufferRegion::read16(u32 offset)
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{
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ASSERT(offset + 1 < size());
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return { *reinterpret_cast<const u16*>(m_data + offset), *reinterpret_cast<const u16*>(m_shadow_data + offset) };
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}
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ValueWithShadow<u32> SharedBufferRegion::read32(u32 offset)
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{
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ASSERT(offset + 3 < size());
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return { *reinterpret_cast<const u32*>(m_data + offset), *reinterpret_cast<const u32*>(m_shadow_data + offset) };
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}
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void SharedBufferRegion::write8(u32 offset, ValueWithShadow<u8> value)
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{
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ASSERT(offset < size());
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*reinterpret_cast<u8*>(m_data + offset) = value.value();
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*reinterpret_cast<u8*>(m_shadow_data + offset) = value.shadow();
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}
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void SharedBufferRegion::write16(u32 offset, ValueWithShadow<u16> value)
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{
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ASSERT(offset + 1 < size());
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*reinterpret_cast<u16*>(m_data + offset) = value.value();
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*reinterpret_cast<u16*>(m_shadow_data + offset) = value.shadow();
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}
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void SharedBufferRegion::write32(u32 offset, ValueWithShadow<u32> value)
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{
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ASSERT(offset + 3 < size());
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*reinterpret_cast<u32*>(m_data + offset) = value.value();
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*reinterpret_cast<u32*>(m_shadow_data + offset) = value.shadow();
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}
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int SharedBufferRegion::allow_all()
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{
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return syscall(SC_shbuf_allow_all, m_shbuf_id);
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}
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int SharedBufferRegion::allow_pid(pid_t pid)
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{
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return syscall(SC_shbuf_allow_pid, m_shbuf_id, pid);
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}
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int SharedBufferRegion::seal()
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{
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return syscall(SC_shbuf_seal, m_shbuf_id);
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}
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int SharedBufferRegion::release()
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{
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return syscall(SC_shbuf_release, m_shbuf_id);
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}
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int SharedBufferRegion::set_volatile(bool is_volatile)
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{
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return syscall(SC_shbuf_set_volatile, m_shbuf_id, is_volatile);
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}
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}
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