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https://github.com/RGBCube/serenity
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01b79910b3
The compiler can re-order the structure (class) members if that's necessary, so if we make Process to inherit from ProcFSExposedComponent, even if the declaration is to inherit first from ProcessBase, then from ProcFSExposedComponent and last from Weakable<Process>, the members of class ProcFSExposedComponent (including the Ref-counted parts) are the first members of the Process class. This problem made it impossible to safely use the current toggling method with the write-protection bit on the ProcessBase members, so instead of inheriting from it, we make its members the last ones in the Process class so we can safely locate and modify the corresponding page write protection bit of these values. We make sure that the Process class doesn't expand beyond 8192 bytes and the protected values are always aligned on a page boundary.
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2020, 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 <AK/Types.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$getpid()
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this)
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REQUIRE_PROMISE(stdio);
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return pid().value();
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}
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KResultOr<FlatPtr> Process::sys$getppid()
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(stdio);
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return m_protected_values.ppid.value();
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}
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KResultOr<FlatPtr> Process::sys$get_process_name(Userspace<char*> buffer, size_t buffer_size)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(stdio);
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if (m_name.length() + 1 > buffer_size)
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return ENAMETOOLONG;
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if (!copy_to_user(buffer, m_name.characters(), m_name.length() + 1))
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return EFAULT;
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return 0;
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}
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KResultOr<FlatPtr> Process::sys$set_process_name(Userspace<const char*> user_name, size_t user_name_length)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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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<FlatPtr> Process::sys$set_coredump_metadata(Userspace<const Syscall::SC_set_coredump_metadata_params*> user_params)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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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 key_or_error = try_copy_kstring_from_user(params.key);
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if (key_or_error.is_error())
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return key_or_error.error();
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auto key = key_or_error.release_value();
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auto value_or_error = try_copy_kstring_from_user(params.value);
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if (value_or_error.is_error())
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return value_or_error.error();
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auto value = value_or_error.release_value();
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return set_coredump_property(move(key), move(value));
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}
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}
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