[HWASan] [16k] do not instrument getauxval
To support page agnostic systems, we call getauxval before HWASan is
fully set up.
Bug: 315511637
Change-Id: I0b760943a23bd3a4d83bcc2182696a827dcbd446
diff --git a/libc/bionic/getauxval.cpp b/libc/bionic/getauxval.cpp
index a3c6b19..e188d73 100644
--- a/libc/bionic/getauxval.cpp
+++ b/libc/bionic/getauxval.cpp
@@ -37,7 +37,9 @@
// This function needs to be safe to call before TLS is set up, so it can't
// access errno or the stack protector.
-__LIBC_HIDDEN__ unsigned long __bionic_getauxval(unsigned long type, bool* exists) {
+// Cannot use HWASan, as this is called during setup of the HWASan runtime to
+// determine the page size.
+__LIBC_HIDDEN__ unsigned long __bionic_getauxval(unsigned long type, bool* exists) __attribute__((no_sanitize("hwaddress"))) {
for (ElfW(auxv_t)* v = __libc_shared_globals()->auxv; v->a_type != AT_NULL; ++v) {
if (v->a_type == type) {
*exists = true;
@@ -48,7 +50,9 @@
return 0;
}
-extern "C" unsigned long getauxval(unsigned long type) {
+// Cannot use HWASan, as this is called during setup of the HWASan runtime to
+// determine the page size.
+extern "C" unsigned long getauxval(unsigned long type) __attribute__((no_sanitize("hwaddress"))) {
bool exists;
unsigned long result = __bionic_getauxval(type, &exists);
if (!exists) errno = ENOENT;