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, 56 insertions, 0 deletions

diff --git a/drivers/crypto/qce/aead.h b/drivers/crypto/qce/aead.h
new file mode 100644
index 000000000..efb8477cc
--- /dev/null
+++ b/drivers/crypto/qce/aead.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021, Linaro Limited. All rights reserved.
+ */
+
+#ifndef _AEAD_H_
+#define _AEAD_H_
+
+#include "common.h"
+#include "core.h"
+
+#define QCE_MAX_KEY_SIZE		64
+#define QCE_CCM4309_SALT_SIZE		3
+
+struct qce_aead_ctx {
+	u8 enc_key[QCE_MAX_KEY_SIZE];
+	u8 auth_key[QCE_MAX_KEY_SIZE];
+	u8 ccm4309_salt[QCE_CCM4309_SALT_SIZE];
+	unsigned int enc_keylen;
+	unsigned int auth_keylen;
+	unsigned int authsize;
+	bool need_fallback;
+	struct crypto_aead *fallback;
+};
+
+struct qce_aead_reqctx {
+	unsigned long flags;
+	u8 *iv;
+	unsigned int ivsize;
+	int src_nents;
+	int dst_nents;
+	struct scatterlist result_sg;
+	struct scatterlist adata_sg;
+	struct sg_table dst_tbl;
+	struct sg_table src_tbl;
+	struct scatterlist *dst_sg;
+	struct scatterlist *src_sg;
+	unsigned int cryptlen;
+	unsigned int assoclen;
+	unsigned char *adata;
+	u8 ccm_nonce[QCE_MAX_NONCE];
+	u8 ccmresult_buf[QCE_BAM_BURST_SIZE];
+	u8 ccm_rfc4309_iv[QCE_MAX_IV_SIZE];
+	struct aead_request fallback_req;
+};
+
+static inline struct qce_alg_template *to_aead_tmpl(struct crypto_aead *tfm)
+{
+	struct aead_alg *alg = crypto_aead_alg(tfm);
+
+	return container_of(alg, struct qce_alg_template, alg.aead);
+}
+
+extern const struct qce_algo_ops aead_ops;
+
+#endif /* _AEAD_H_ */