ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 149 insertions, 0 deletions

diff --git a/lib/crypto/sparc/aes.h b/lib/crypto/sparc/aes.h
new file mode 100644
index 000000000..e354aa507
--- /dev/null
+++ b/lib/crypto/sparc/aes.h
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * AES accelerated using the sparc64 aes opcodes
+ *
+ * Copyright (C) 2008, Intel Corp.
+ * Copyright (c) 2010, Intel Corporation.
+ * Copyright 2026 Google LLC
+ */
+
+#include <asm/fpumacro.h>
+#include <asm/opcodes.h>
+#include <asm/pstate.h>
+#include <asm/elf.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_aes_opcodes);
+
+EXPORT_SYMBOL_GPL(aes_sparc64_key_expand);
+EXPORT_SYMBOL_GPL(aes_sparc64_load_encrypt_keys_128);
+EXPORT_SYMBOL_GPL(aes_sparc64_load_encrypt_keys_192);
+EXPORT_SYMBOL_GPL(aes_sparc64_load_encrypt_keys_256);
+EXPORT_SYMBOL_GPL(aes_sparc64_load_decrypt_keys_128);
+EXPORT_SYMBOL_GPL(aes_sparc64_load_decrypt_keys_192);
+EXPORT_SYMBOL_GPL(aes_sparc64_load_decrypt_keys_256);
+EXPORT_SYMBOL_GPL(aes_sparc64_ecb_encrypt_128);
+EXPORT_SYMBOL_GPL(aes_sparc64_ecb_encrypt_192);
+EXPORT_SYMBOL_GPL(aes_sparc64_ecb_encrypt_256);
+EXPORT_SYMBOL_GPL(aes_sparc64_ecb_decrypt_128);
+EXPORT_SYMBOL_GPL(aes_sparc64_ecb_decrypt_192);
+EXPORT_SYMBOL_GPL(aes_sparc64_ecb_decrypt_256);
+EXPORT_SYMBOL_GPL(aes_sparc64_cbc_encrypt_128);
+EXPORT_SYMBOL_GPL(aes_sparc64_cbc_encrypt_192);
+EXPORT_SYMBOL_GPL(aes_sparc64_cbc_encrypt_256);
+EXPORT_SYMBOL_GPL(aes_sparc64_cbc_decrypt_128);
+EXPORT_SYMBOL_GPL(aes_sparc64_cbc_decrypt_192);
+EXPORT_SYMBOL_GPL(aes_sparc64_cbc_decrypt_256);
+EXPORT_SYMBOL_GPL(aes_sparc64_ctr_crypt_128);
+EXPORT_SYMBOL_GPL(aes_sparc64_ctr_crypt_192);
+EXPORT_SYMBOL_GPL(aes_sparc64_ctr_crypt_256);
+
+void aes_sparc64_encrypt_128(const u64 *key, const u32 *input, u32 *output);
+void aes_sparc64_encrypt_192(const u64 *key, const u32 *input, u32 *output);
+void aes_sparc64_encrypt_256(const u64 *key, const u32 *input, u32 *output);
+void aes_sparc64_decrypt_128(const u64 *key, const u32 *input, u32 *output);
+void aes_sparc64_decrypt_192(const u64 *key, const u32 *input, u32 *output);
+void aes_sparc64_decrypt_256(const u64 *key, const u32 *input, u32 *output);
+
+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)
+{
+	if (static_branch_likely(&have_aes_opcodes)) {
+		u32 aligned_key[AES_MAX_KEY_SIZE / 4];
+
+		if (IS_ALIGNED((uintptr_t)in_key, 4)) {
+			aes_sparc64_key_expand((const u32 *)in_key,
+					       k->sparc_rndkeys, key_len);
+		} else {
+			memcpy(aligned_key, in_key, key_len);
+			aes_sparc64_key_expand(aligned_key,
+					       k->sparc_rndkeys, key_len);
+			memzero_explicit(aligned_key, key_len);
+		}
+		/*
+		 * Note that nothing needs to be written to inv_k (if it's
+		 * non-NULL) here, since the SPARC64 assembly code uses
+		 * k->sparc_rndkeys for both encryption and decryption.
+		 */
+	} else {
+		aes_expandkey_generic(k->rndkeys,
+				      inv_k ? inv_k->inv_rndkeys : NULL,
+				      in_key, key_len);
+	}
+}
+
+static void aes_sparc64_encrypt(const struct aes_enckey *key,
+				const u32 *input, u32 *output)
+{
+	if (key->len == AES_KEYSIZE_128)
+		aes_sparc64_encrypt_128(key->k.sparc_rndkeys, input, output);
+	else if (key->len == AES_KEYSIZE_192)
+		aes_sparc64_encrypt_192(key->k.sparc_rndkeys, input, output);
+	else
+		aes_sparc64_encrypt_256(key->k.sparc_rndkeys, input, output);
+}
+
+static void aes_encrypt_arch(const struct aes_enckey *key,
+			     u8 out[AES_BLOCK_SIZE],
+			     const u8 in[AES_BLOCK_SIZE])
+{
+	u32 bounce_buf[AES_BLOCK_SIZE / 4];
+
+	if (static_branch_likely(&have_aes_opcodes)) {
+		if (IS_ALIGNED((uintptr_t)in | (uintptr_t)out, 4)) {
+			aes_sparc64_encrypt(key, (const u32 *)in, (u32 *)out);
+		} else {
+			memcpy(bounce_buf, in, AES_BLOCK_SIZE);
+			aes_sparc64_encrypt(key, bounce_buf, bounce_buf);
+			memcpy(out, bounce_buf, AES_BLOCK_SIZE);
+		}
+	} else {
+		aes_encrypt_generic(key->k.rndkeys, key->nrounds, out, in);
+	}
+}
+
+static void aes_sparc64_decrypt(const struct aes_key *key,
+				const u32 *input, u32 *output)
+{
+	if (key->len == AES_KEYSIZE_128)
+		aes_sparc64_decrypt_128(key->k.sparc_rndkeys, input, output);
+	else if (key->len == AES_KEYSIZE_192)
+		aes_sparc64_decrypt_192(key->k.sparc_rndkeys, input, output);
+	else
+		aes_sparc64_decrypt_256(key->k.sparc_rndkeys, input, output);
+}
+
+static void aes_decrypt_arch(const struct aes_key *key,
+			     u8 out[AES_BLOCK_SIZE],
+			     const u8 in[AES_BLOCK_SIZE])
+{
+	u32 bounce_buf[AES_BLOCK_SIZE / 4];
+
+	if (static_branch_likely(&have_aes_opcodes)) {
+		if (IS_ALIGNED((uintptr_t)in | (uintptr_t)out, 4)) {
+			aes_sparc64_decrypt(key, (const u32 *)in, (u32 *)out);
+		} else {
+			memcpy(bounce_buf, in, AES_BLOCK_SIZE);
+			aes_sparc64_decrypt(key, bounce_buf, bounce_buf);
+			memcpy(out, bounce_buf, AES_BLOCK_SIZE);
+		}
+	} else {
+		aes_decrypt_generic(key->inv_k.inv_rndkeys, key->nrounds,
+				    out, in);
+	}
+}
+
+#define aes_mod_init_arch aes_mod_init_arch
+static void aes_mod_init_arch(void)
+{
+	unsigned long cfr;
+
+	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+		return;
+
+	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+	if (!(cfr & CFR_AES))
+		return;
+
+	static_branch_enable(&have_aes_opcodes);
+}