Read fault address on arm64 using proposed kernel API.
On aarch64, the top 8 bits of the address (i.e. the tag bits) of
the fault address in si_addr are always clear. This isn't ideal for
MTE which will require these bits in order to correctly diagnose
tag mismatches.
A proposed kernel patch [1] exposes the full fault address including
the tag bits as part of the ucontext. Change debuggerd to read this
fault address if available.
[1] https://patchwork.kernel.org/patch/11435077/
Bug: 135772972
Change-Id: Ia05be574113860f4e9ecc36a310c4b740e0c4afb
diff --git a/debuggerd/libdebuggerd/utility.cpp b/debuggerd/libdebuggerd/utility.cpp
index 0a1d2a4..3bf28b6 100644
--- a/debuggerd/libdebuggerd/utility.cpp
+++ b/debuggerd/libdebuggerd/utility.cpp
@@ -449,3 +449,40 @@
_LOG(log, logtype::BACKTRACE, "%s%s\n", prefix, unwinder->FormatFrame(i).c_str());
}
}
+
+#if defined(__aarch64__)
+#define FAR_MAGIC 0x46415201
+
+struct far_context {
+ struct _aarch64_ctx head;
+ __u64 far;
+};
+#endif
+
+uintptr_t get_fault_address(const siginfo_t* siginfo, const ucontext_t* ucontext) {
+ (void)ucontext;
+#if defined(__aarch64__)
+ // This relies on a kernel patch:
+ // https://patchwork.kernel.org/patch/11435077/
+ // that hasn't been accepted into the kernel yet. TODO(pcc): Update this to
+ // use the official interface once it lands.
+ auto* begin = reinterpret_cast<const char*>(ucontext->uc_mcontext.__reserved);
+ auto* end = begin + sizeof(ucontext->uc_mcontext.__reserved);
+ auto* ptr = begin;
+ while (1) {
+ auto* ctx = reinterpret_cast<const _aarch64_ctx*>(ptr);
+ if (ctx->magic == 0) {
+ break;
+ }
+ if (ctx->magic == FAR_MAGIC) {
+ auto* far_ctx = reinterpret_cast<const far_context*>(ctx);
+ return far_ctx->far;
+ }
+ ptr += ctx->size;
+ if (ctx->size % sizeof(void*) != 0 || ptr < begin || ptr >= end) {
+ break;
+ }
+ }
+#endif
+ return reinterpret_cast<uintptr_t>(siginfo->si_addr);
+}