mirror of
https://github.com/RGBCube/serenity
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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
66 lines
1.9 KiB
C++
66 lines
1.9 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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ErrorOr<FlatPtr> Process::sys$getpid()
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this)
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require_promise(Pledge::stdio);
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return pid().value();
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}
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ErrorOr<FlatPtr> Process::sys$getppid()
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::stdio);
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return m_protected_values.ppid.value();
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}
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ErrorOr<FlatPtr> Process::sys$get_process_name(Userspace<char*> buffer, size_t buffer_size)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::stdio);
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if (m_name->length() + 1 > buffer_size)
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return ENAMETOOLONG;
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TRY(copy_to_user(buffer, m_name->characters(), m_name->length() + 1));
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$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(Pledge::proc);
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if (user_name_length > 256)
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return ENAMETOOLONG;
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auto name = TRY(try_copy_kstring_from_user(user_name, user_name_length));
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// Empty and whitespace-only names only exist to confuse users.
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if (name->view().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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ErrorOr<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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auto params = TRY(copy_typed_from_user(user_params));
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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 = TRY(try_copy_kstring_from_user(params.key));
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auto value = TRY(try_copy_kstring_from_user(params.value));
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TRY(set_coredump_property(move(key), move(value)));
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return 0;
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}
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}
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