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78 lines
2.0 KiB
78 lines
2.0 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_LIBARTBASE_BASE_MEMFD_H_
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#define ART_LIBARTBASE_BASE_MEMFD_H_
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#include <fcntl.h>
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#include <unistd.h>
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#if defined(__BIONIC__)
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#include <linux/memfd.h> // To access memfd flags.
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#else
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// If memfd flags don't exist in the current toolchain, define them ourselves.
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#ifndef F_ADD_SEALS
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# define F_ADD_SEALS (1033)
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#endif
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#ifndef F_GET_SEALS
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# define F_GET_SEALS (1034)
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#endif
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#ifndef F_SEAL_SEAL
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# define F_SEAL_SEAL 0x0001
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#endif
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#ifndef F_SEAL_SHRINK
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# define F_SEAL_SHRINK 0x0002
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#endif
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#ifndef F_SEAL_GROW
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# define F_SEAL_GROW 0x0004
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#endif
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#ifndef F_SEAL_WRITE
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# define F_SEAL_WRITE 0x0008
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#endif
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#ifndef F_SEAL_FUTURE_WRITE
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# define F_SEAL_FUTURE_WRITE 0x0010
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#endif
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#ifndef MFD_ALLOW_SEALING
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# define MFD_ALLOW_SEALING 0x0002U
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#endif
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#endif
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namespace art {
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// Call memfd(2) if available on platform and return result. This call also makes a kernel version
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// check for safety on older kernels (b/116769556)..
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int memfd_create(const char* name, unsigned int flags);
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// Call memfd(2) if available on platform and return result. Try to give us an unlinked FD in some
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// other way if memfd fails or isn't supported.
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int memfd_create_compat(const char* name, unsigned int flags);
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// Return whether the kernel supports sealing future writes of a memfd.
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bool IsSealFutureWriteSupported();
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} // namespace art
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#endif // ART_LIBARTBASE_BASE_MEMFD_H_
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