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90c0f9664e
The previous architecture had a huge flaw: the pointer to the protected data was itself unprotected, allowing you to overwrite it at any time. This patch reorganizes the protected data so it's part of the Process class itself. (Actually, it's a new ProcessBase helper class.) We use the first 4 KB of Process objects themselves as the new storage location for protected data. Then we make Process objects page-aligned using MAKE_ALIGNED_ALLOCATED. This allows us to easily turn on/off write-protection for everything in the ProcessBase portion of Process. :^) Thanks to @bugaevc for pointing out the flaw! This is still not perfect but it's an improvement.
92 lines
3.3 KiB
C++
92 lines
3.3 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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#include <AK/Types.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<pid_t> Process::sys$getpid()
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{
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REQUIRE_PROMISE(stdio);
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return pid().value();
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}
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KResultOr<pid_t> Process::sys$getppid()
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{
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REQUIRE_PROMISE(stdio);
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return m_ppid.value();
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}
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KResultOr<int> Process::sys$get_process_name(Userspace<char*> buffer, size_t buffer_size)
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{
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REQUIRE_PROMISE(stdio);
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if (m_name.length() + 1 > buffer_size)
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return ENAMETOOLONG;
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if (!copy_to_user(buffer, m_name.characters(), m_name.length() + 1))
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return EFAULT;
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return 0;
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}
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KResultOr<int> Process::sys$set_process_name(Userspace<const char*> user_name, size_t user_name_length)
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{
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REQUIRE_PROMISE(proc);
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if (user_name_length > 256)
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return ENAMETOOLONG;
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auto name = copy_string_from_user(user_name, user_name_length);
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if (name.is_null())
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return EFAULT;
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// Empty and whitespace-only names only exist to confuse users.
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if (name.is_whitespace())
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return EINVAL;
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m_name = move(name);
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return 0;
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}
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KResultOr<int> Process::sys$set_coredump_metadata(Userspace<const Syscall::SC_set_coredump_metadata_params*> user_params)
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{
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Syscall::SC_set_coredump_metadata_params params;
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if (!copy_from_user(¶ms, user_params))
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return EFAULT;
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if (params.key.length == 0 || params.key.length > 16 * KiB)
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return EINVAL;
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if (params.value.length > 16 * KiB)
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return EINVAL;
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auto copied_key = copy_string_from_user(params.key.characters, params.key.length);
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if (copied_key.is_null())
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return EFAULT;
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auto copied_value = copy_string_from_user(params.value.characters, params.value.length);
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if (copied_value.is_null())
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return EFAULT;
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if (!m_coredump_metadata.contains(copied_key) && m_coredump_metadata.size() >= 16)
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return EFAULT;
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m_coredump_metadata.set(move(copied_key), move(copied_value));
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return 0;
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}
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}
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