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[HWASan] [16k] do not instrument getauxval

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To support page agnostic systems, we call getauxval before HWASan is
fully set up.

Bug: 315511637
Change-Id: I0b760943a23bd3a4d83bcc2182696a827dcbd446
This commit is contained in:
Florian Mayer 2024-06-10 17:35:25 -07:00
parent e78370e5f8
commit d8328a931b
1 changed files with 6 additions and 2 deletions
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8
libc/bionic/getauxval.cpp
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@ -37,7 +37,9 @@
// This function needs to be safe to call before TLS is set up, so it can't // This function needs to be safe to call before TLS is set up, so it can't
// access errno or the stack protector. // 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) { for (ElfW(auxv_t)* v = __libc_shared_globals()->auxv; v->a_type != AT_NULL; ++v) {
if (v->a_type == type) { if (v->a_type == type) {
*exists = true; *exists = true;
@ -48,7 +50,9 @@ __LIBC_HIDDEN__ unsigned long __bionic_getauxval(unsigned long type, bool* exist
return 0; 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; bool exists;
unsigned long result = __bionic_getauxval(type, &exists); unsigned long result = __bionic_getauxval(type, &exists);
if (!exists) errno = ENOENT; if (!exists) errno = ENOENT;