mirror of
https://github.com/RGBCube/serenity
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d8ebcaede8
Use this helper function in various places to replace the old code of acquiring the SpinlockProtected<RefPtr<Jail>> of a Process to do that validation.
42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/Variables/StringVariable.h>
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#include <Kernel/Process.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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ErrorOr<void> SysFSSystemStringVariable::try_generate(KBufferBuilder& builder)
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{
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auto string_value = TRY(value());
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return builder.appendff("{}\n", string_value->view());
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}
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ErrorOr<size_t> SysFSSystemStringVariable::write_bytes(off_t, size_t count, UserOrKernelBuffer const& buffer, OpenFileDescription*)
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{
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MutexLocker locker(m_refresh_lock);
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// Note: We do all of this code before taking the spinlock because then we disable
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// interrupts so page faults will not work.
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char* value = nullptr;
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auto new_value = TRY(KString::try_create_uninitialized(count, value));
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TRY(buffer.read(value, count));
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auto new_value_without_possible_newlines = TRY(KString::try_create(new_value->view().trim("\n"sv)));
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// NOTE: If we are in a jail, don't let the current process to change the variable.
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if (Process::current().is_currently_in_jail())
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return Error::from_errno(EPERM);
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set_value(move(new_value_without_possible_newlines));
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return count;
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}
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ErrorOr<void> SysFSSystemStringVariable::truncate(u64 size)
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{
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if (size != 0)
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return EPERM;
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return {};
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}
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}
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