Basic support for MTE stack tagging.
Map all stacks (primary, thread, and sigaltstack) as PROT_MTE when the
binary requests it through the ELF note.
For the reference, the note is produced by the following toolchain changes:
https://reviews.llvm.org/D118948
https://reviews.llvm.org/D119384
https://reviews.llvm.org/D119381
Bug: b/174878242
Test: fvp_mini with ToT LLVM (more tests in a separate change)
Change-Id: I04a4e21c966e7309b47b1f549a2919958d93a872
diff --git a/libc/private/bionic_globals.h b/libc/private/bionic_globals.h
index e105c18..3c86ef5 100644
--- a/libc/private/bionic_globals.h
+++ b/libc/private/bionic_globals.h
@@ -47,6 +47,7 @@
vdso_entry vdso[VDSO_END];
long setjmp_cookie;
uintptr_t heap_pointer_tag;
+ _Atomic(bool) memtag_stack;
// In order to allow a complete switch between dispatch tables without
// the need for copying each function by function in the structure,
@@ -112,6 +113,7 @@
const char* scudo_ring_buffer = nullptr;
HeapTaggingLevel initial_heap_tagging_level = M_HEAP_TAGGING_LEVEL_NONE;
+ bool initial_memtag_stack = false;
};
__LIBC_HIDDEN__ libc_shared_globals* __libc_shared_globals();