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[scudo] Add Scudo support for Trusty OS
trusty.cpp and trusty.h define Trusty implementations of map and other platform-specific functions. In addition to adding Trusty configurations in allocator_config.h and size_class_map.h, MapSizeIncrement and PrimaryEnableRandomOffset are added as configurable options in allocator_config.h. Background on Trusty: https://source.android.com/security/trusty Differential Revision: https://reviews.llvm.org/D103578
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Daniel Michael
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Kostya Kortchinsky
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Jun 8, 2021
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| #include "fuchsia.h" | ||
| #include "linux.h" | ||
| #include "trusty.h" | ||
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| #include <stddef.h> | ||
| #include <string.h> | ||
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| //===-- trusty.cpp ---------------------------------------------*- C++ -*-===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #include "platform.h" | ||
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| #if SCUDO_TRUSTY | ||
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| #include "common.h" | ||
| #include "mutex.h" | ||
| #include "string_utils.h" | ||
| #include "trusty.h" | ||
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| #include <errno.h> // for errno | ||
| #include <stdio.h> // for printf() | ||
| #include <stdlib.h> // for getenv() | ||
| #include <sys/auxv.h> // for getauxval() | ||
| #include <time.h> // for clock_gettime() | ||
| #include <trusty_syscalls.h> // for _trusty_brk() | ||
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| #define SBRK_ALIGN 32 | ||
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| namespace scudo { | ||
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| uptr getPageSize() { return getauxval(AT_PAGESZ); } | ||
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| void NORETURN die() { abort(); } | ||
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| void *map(UNUSED void *Addr, uptr Size, UNUSED const char *Name, uptr Flags, | ||
| UNUSED MapPlatformData *Data) { | ||
| // Calling _trusty_brk(0) returns the current program break. | ||
| uptr ProgramBreak = reinterpret_cast<uptr>(_trusty_brk(0)); | ||
| uptr Start; | ||
| uptr End; | ||
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| Start = roundUpTo(ProgramBreak, SBRK_ALIGN); | ||
| // Don't actually extend the heap if MAP_NOACCESS flag is set since this is | ||
| // the case where Scudo tries to reserve a memory region without mapping | ||
| // physical pages. | ||
| if (Flags & MAP_NOACCESS) | ||
| return reinterpret_cast<void *>(Start); | ||
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| // Attempt to extend the heap by Size bytes using _trusty_brk. | ||
| End = roundUpTo(Start + Size, SBRK_ALIGN); | ||
| ProgramBreak = | ||
| reinterpret_cast<uptr>(_trusty_brk(reinterpret_cast<void *>(End))); | ||
| if (ProgramBreak < End) { | ||
| errno = ENOMEM; | ||
| dieOnMapUnmapError(Size); | ||
| return nullptr; | ||
| } | ||
| return reinterpret_cast<void *>(Start); // Base of new reserved region. | ||
| } | ||
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| // Unmap is a no-op since Trusty uses sbrk instead of memory mapping. | ||
| void unmap(UNUSED void *Addr, UNUSED uptr Size, UNUSED uptr Flags, | ||
| UNUSED MapPlatformData *Data) {} | ||
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| void setMemoryPermission(UNUSED uptr Addr, UNUSED uptr Size, UNUSED uptr Flags, | ||
| UNUSED MapPlatformData *Data) {} | ||
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| void releasePagesToOS(UNUSED uptr BaseAddress, UNUSED uptr Offset, | ||
| UNUSED uptr Size, UNUSED MapPlatformData *Data) {} | ||
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| const char *getEnv(const char *Name) { return getenv(Name); } | ||
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| // All mutex operations are a no-op since Trusty doesn't currently support | ||
| // threads. | ||
| bool HybridMutex::tryLock() { return true; } | ||
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| void HybridMutex::lockSlow() {} | ||
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| void HybridMutex::unlock() {} | ||
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| u64 getMonotonicTime() { | ||
| timespec TS; | ||
| clock_gettime(CLOCK_MONOTONIC, &TS); | ||
| return static_cast<u64>(TS.tv_sec) * (1000ULL * 1000 * 1000) + | ||
| static_cast<u64>(TS.tv_nsec); | ||
| } | ||
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| u32 getNumberOfCPUs() { return 0; } | ||
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| u32 getThreadID() { return 0; } | ||
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| bool getRandom(UNUSED void *Buffer, UNUSED uptr Length, UNUSED bool Blocking) { | ||
| return false; | ||
| } | ||
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| void outputRaw(const char *Buffer) { printf("%s", Buffer); } | ||
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| void setAbortMessage(UNUSED const char *Message) {} | ||
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| } // namespace scudo | ||
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| #endif // SCUDO_TRUSTY |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,24 @@ | ||
| //===-- trusty.h -----------------------------------------------*- C++ -*-===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #ifndef SCUDO_TRUSTY_H_ | ||
| #define SCUDO_TRUSTY_H_ | ||
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| #include "platform.h" | ||
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| #if SCUDO_TRUSTY | ||
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| namespace scudo { | ||
| // MapPlatformData is unused on Trusty, define it as a minimially sized | ||
| // structure. | ||
| struct MapPlatformData {}; | ||
| } // namespace scudo | ||
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| #endif // SCUDO_TRUSTY | ||
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| #endif // SCUDO_TRUSTY_H_ |