commit 8564b8d9e61580bef3bd5018cf63e37c78e40053
author Evgenii Stepanov <eugenis@google.com> Tue Dec 15 13:55:32 2020 -0800
committer Evgenii Stepanov <eugenis@google.com> Wed Jan 06 16:08:18 2021 -0800
tree 31105008dfcd942690f7143595121c2ab5d2bde8
parent dec48bdd9ee090f3b0e3ff22dcac4689a146e8d0

Use ELF notes to set the desired memory tagging level.

Use a note in executables to specify
(none|sync|async) heap tagging level. To be extended with (heap x stack x
globals) in the future. A missing note disables all tagging.

Bug: b/135772972
Test: bionic-unit-tests (in a future change)

Change-Id: Iab145a922c7abe24cdce17323f9e0c1063cc1321

libc/private/bionic_asm_note.h

diff --git a/libc/private/bionic_asm_note.h b/libc/private/bionic_asm_note.h
index c335c5a..80b8f01 100644
--- a/libc/private/bionic_asm_note.h
+++ b/libc/private/bionic_asm_note.h
@@ -30,3 +30,4 @@
 
 #define NT_TYPE_IDENT 1
 #define NT_TYPE_KUSER 3
+#define NT_TYPE_MEMTAG 4