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-rw-r--r--lib/asan/asan_premap_shadow.cpp78
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diff --git a/lib/asan/asan_premap_shadow.cpp b/lib/asan/asan_premap_shadow.cpp
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+//===-- asan_premap_shadow.cpp --------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// Reserve shadow memory with an ifunc resolver.
+//===----------------------------------------------------------------------===//
+
+#include "asan_mapping.h"
+
+#if ASAN_PREMAP_SHADOW
+
+#include "asan_premap_shadow.h"
+#include "sanitizer_common/sanitizer_posix.h"
+
+namespace __asan {
+
+// The code in this file needs to run in an unrelocated binary. It may not
+// access any external symbol, including its own non-hidden globals.
+
+// Conservative upper limit.
+uptr PremapShadowSize() {
+ uptr granularity = GetMmapGranularity();
+ return RoundUpTo(GetMaxVirtualAddress() >> SHADOW_SCALE, granularity);
+}
+
+// Returns an address aligned to 8 pages, such that one page on the left and
+// PremapShadowSize() bytes on the right of it are mapped r/o.
+uptr PremapShadow() {
+ uptr granularity = GetMmapGranularity();
+ uptr alignment = granularity * 8;
+ uptr left_padding = granularity;
+ uptr shadow_size = PremapShadowSize();
+ uptr map_size = shadow_size + left_padding + alignment;
+
+ uptr map_start = (uptr)MmapNoAccess(map_size);
+ CHECK_NE(map_start, ~(uptr)0);
+
+ uptr shadow_start = RoundUpTo(map_start + left_padding, alignment);
+ uptr shadow_end = shadow_start + shadow_size;
+ internal_munmap(reinterpret_cast<void *>(map_start),
+ shadow_start - left_padding - map_start);
+ internal_munmap(reinterpret_cast<void *>(shadow_end),
+ map_start + map_size - shadow_end);
+ return shadow_start;
+}
+
+bool PremapShadowFailed() {
+ uptr shadow = reinterpret_cast<uptr>(&__asan_shadow);
+ uptr resolver = reinterpret_cast<uptr>(&__asan_premap_shadow);
+ // shadow == resolver is how Android KitKat and older handles ifunc.
+ // shadow == 0 just in case.
+ if (shadow == 0 || shadow == resolver)
+ return true;
+ return false;
+}
+} // namespace __asan
+
+extern "C" {
+decltype(__asan_shadow)* __asan_premap_shadow() {
+ // The resolver may be called multiple times. Map the shadow just once.
+ static uptr premapped_shadow = 0;
+ if (!premapped_shadow) premapped_shadow = __asan::PremapShadow();
+ return reinterpret_cast<decltype(__asan_shadow)*>(premapped_shadow);
+}
+
+// __asan_shadow is a "function" that has the same address as the first byte of
+// the shadow mapping.
+INTERFACE_ATTRIBUTE __attribute__((ifunc("__asan_premap_shadow"))) void
+__asan_shadow();
+}
+
+#endif // ASAN_PREMAP_SHADOW