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https://github.com/RGBCube/serenity
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0f6f863382
This patch replaces the remaining users of this API with the new try_copy_kstring_from_user() instead. Note that we still convert to a String for continued processing, and I've added FIXME about continuing work on using KString all the way.
76 lines
2.3 KiB
C++
76 lines
2.3 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_or_error = try_copy_kstring_from_user(user_name, user_name_length);
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if (name_or_error.is_error())
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return name_or_error.error();
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// Empty and whitespace-only names only exist to confuse users.
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if (name_or_error.value()->view().is_whitespace())
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return EINVAL;
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// FIXME: There's a String copy here. Process::m_name should be a KString.
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m_name = name_or_error.value()->view();
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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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