objtool: Validate disassembler headers in libopcodes probegrafted

commit 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries")
tested for libopcodes availability by linking a test snippet with a forward
declaration of disassemble_init_for_target().

However, testing symbol linkage with an extern declaration only verifies
the presence of the library (.so/.a) and bypasses checking for development
headers (binutils-dev). On systems where libopcodes is present without
development headers installed, the probe succeeds, enabling BUILD_DISAS.
Subsequent compilation of objtool then fails:

  fatal error: 'bfd.h' file not found
    113 | #include <bfd.h>

Additionally, the probe invokes $(HOSTCC) without $(HOSTCFLAGS), ignoring
any sysroot or include flags specified for the host compiler.

Fix this by including <bfd.h> and <dis-asm.h> directly in the test snippet,
passing $(HOSTCFLAGS) so host compiler options are respected, and defining
PACKAGE="objtool" to satisfy the configuration check in <bfd.h>.

Fixes: 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries")
Fixes: 436326bc525d ("objtool: fix build failure due to missing libopcodes check")
Reported-by: Alice Ryhl <aliceryhl@google.com>
Assisted-by: Antigravity:Gemini-Next
Signed-off-by: Ulises Mendez Martinez <umendez@google.com>
Link: https://patch.msgid.link/20260904150710.2997558-1-umendez@google.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/lib/crypto/arm/aes.h b/lib/crypto/arm/aes.h
new file mode 100644
index 000000000..1dd7dfa65
--- /dev/null
+++ b/lib/crypto/arm/aes.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * AES block cipher, optimized for ARM
+ *
+ * Copyright (C) 2017 Linaro Ltd.
+ * Copyright 2026 Google LLC
+ */
+
+asmlinkage void __aes_arm_encrypt(const u32 rk[], int rounds,
+				  const u8 in[AES_BLOCK_SIZE],
+				  u8 out[AES_BLOCK_SIZE]);
+asmlinkage void __aes_arm_decrypt(const u32 inv_rk[], int rounds,
+				  const u8 in[AES_BLOCK_SIZE],
+				  u8 out[AES_BLOCK_SIZE]);
+
+static void aes_preparekey_arch(union aes_enckey_arch *k,
+				union aes_invkey_arch *inv_k,
+				const u8 *in_key, int key_len, int nrounds)
+{
+	aes_expandkey_generic(k->rndkeys, inv_k ? inv_k->inv_rndkeys : NULL,
+			      in_key, key_len);
+}
+
+static void aes_encrypt_arch(const struct aes_enckey *key,
+			     u8 out[AES_BLOCK_SIZE],
+			     const u8 in[AES_BLOCK_SIZE])
+{
+	if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
+	    !IS_ALIGNED((uintptr_t)out | (uintptr_t)in, 4)) {
+		u8 bounce_buf[AES_BLOCK_SIZE] __aligned(4);
+
+		memcpy(bounce_buf, in, AES_BLOCK_SIZE);
+		__aes_arm_encrypt(key->k.rndkeys, key->nrounds, bounce_buf,
+				  bounce_buf);
+		memcpy(out, bounce_buf, AES_BLOCK_SIZE);
+		return;
+	}
+	__aes_arm_encrypt(key->k.rndkeys, key->nrounds, in, out);
+}
+
+static void aes_decrypt_arch(const struct aes_key *key,
+			     u8 out[AES_BLOCK_SIZE],
+			     const u8 in[AES_BLOCK_SIZE])
+{
+	if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
+	    !IS_ALIGNED((uintptr_t)out | (uintptr_t)in, 4)) {
+		u8 bounce_buf[AES_BLOCK_SIZE] __aligned(4);
+
+		memcpy(bounce_buf, in, AES_BLOCK_SIZE);
+		__aes_arm_decrypt(key->inv_k.inv_rndkeys, key->nrounds,
+				  bounce_buf, bounce_buf);
+		memcpy(out, bounce_buf, AES_BLOCK_SIZE);
+		return;
+	}
+	__aes_arm_decrypt(key->inv_k.inv_rndkeys, key->nrounds, in, out);
+}