Re-land^2 linker support for MTE globals
The original reland was fine, but there was an app compat problem
because it incremented SOINFO_VERSION. This is a problem with the
app, but turns out we don't actually need to increment the version,
because it is unused on aarch64 and memtag-globals are aarch64
only.
The original patch (aosp/1845896) had a major bug. This happened for
out-of-bounds RELR relocations, as we'd attempt to materialize the
address tag of the result unconditionally. This meant crashes happened
on non-MTE devices (particularly the webview) when loading DSOs
containing an OOB RELR reloc.
This patch includes a fix, where we only materialize the tag during RELR
and other relocations if the result is in a binary that uses MTE
globals. Note that that's not the binary *containing* the relocation has
MTE globals (for RELR/RELATIVE relocations the binary containing the
relocation and the result is the same binary, but that's not the case
for GLOB_DAT).
Other than that, from the original patch, this adds the necessary
bionic code for the linker to protect global data during MTE.
The implementation is described in the MemtagABI addendum to the
AArch64 ELF ABI:
https://github.com/ARM-software/abi-aa/blob/main/memtagabielf64/memtagabielf64.rst
In summary, this patch includes:
1. When MTE globals is requested, the linker maps writable SHF_ALLOC
sections as anonymous pages with PROT_MTE (copying the file contents
into the anonymous mapping), rather than using a file-backed private
mapping. This is required as file-based mappings are not necessarily
backed by the kernel with tag-capable memory. For sections already
mapped by the kernel when the linker is invoked via. PT_INTERP, we
unmap the contents, remap a PROT_MTE+anonymous mapping in its place,
and re-load the file contents from disk.
2. When MTE globals is requested, the linker tags areas of global memory
(as defined in SHT_AARCH64_MEMTAG_GLOBALS_DYNAMIC) with random tags,
but ensuring that adjacent globals are never tagged using the same
memory tag (to provide detemrinistic overflow detection).
3. Changes to RELATIVE, ABS64, and GLOB_DAT relocations to load and
store tags in the right places. This ensures that the address tags are
materialized into the GOT entries as well. These changes are a
functional no-op to existing binaries and/or non-MTE capable hardware.
Bug: 315182011
Test: On both an MTE-enabled and non-MTE-enabled device:
Test: atest libprocinfo_test bionic-unit-tests bionic-unit-tests-static CtsGwpAsanTestCases gwp_asan_unittest debuggerd_test memtag_stack_dlopen_test
Change-Id: I75f2ca4a5a08550d80b6b0978fc1bcefff284505
diff --git a/libc/bionic/__libc_init_main_thread.cpp b/libc/bionic/__libc_init_main_thread.cpp
index 1b539f2..0d557f1 100644
--- a/libc/bionic/__libc_init_main_thread.cpp
+++ b/libc/bionic/__libc_init_main_thread.cpp
@@ -44,7 +44,7 @@
// Declared in "private/bionic_ssp.h".
uintptr_t __stack_chk_guard = 0;
-static pthread_internal_t main_thread;
+BIONIC_USED_BEFORE_LINKER_RELOCATES static pthread_internal_t main_thread;
// Setup for the main thread. For dynamic executables, this is called by the
// linker _before_ libc is mapped in memory. This means that all writes to