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862b3ccb4e
It's now an error to sys$mmap() a file as writable if it's currently mapped executable by anyone else. It's also an error to sys$execve() a file that's currently mapped writable by anyone else. This fixes a race condition vulnerability where one program could make modifications to an executable while another process was in the kernel, in the middle of exec'ing the same executable. Test: Kernel/elf-execve-mmap-race.cpp
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, 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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#pragma once
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#include <Kernel/UnixTypes.h>
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#include <Kernel/VM/VMObject.h>
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class InodeVMObject final : public VMObject {
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public:
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virtual ~InodeVMObject() override;
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static NonnullRefPtr<InodeVMObject> create_with_inode(Inode&);
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virtual NonnullRefPtr<VMObject> clone() override;
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Inode& inode() { return *m_inode; }
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const Inode& inode() const { return *m_inode; }
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void inode_contents_changed(Badge<Inode>, off_t, ssize_t, const u8*);
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void inode_size_changed(Badge<Inode>, size_t old_size, size_t new_size);
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size_t amount_dirty() const;
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size_t amount_clean() const;
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int release_all_clean_pages();
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u32 writable_mappings() const;
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u32 executable_mappings() const;
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private:
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explicit InodeVMObject(Inode&, size_t);
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explicit InodeVMObject(const InodeVMObject&);
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InodeVMObject& operator=(const InodeVMObject&) = delete;
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InodeVMObject& operator=(InodeVMObject&&) = delete;
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InodeVMObject(InodeVMObject&&) = delete;
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virtual bool is_inode() const override { return true; }
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int release_all_clean_pages_impl();
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NonnullRefPtr<Inode> m_inode;
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Bitmap m_dirty_pages;
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};
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