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, 145 insertions, 0 deletions

diff --git a/lib/crypto/arm64/aes-ce.S b/lib/crypto/arm64/aes-ce.S
new file mode 100644
index 000000000..b853e02f7
--- /dev/null
+++ b/lib/crypto/arm64/aes-ce.S
@@ -0,0 +1,145 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * AES cipher for ARMv8 with Crypto Extensions
+ *
+ * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+#define AES_FUNC_START(func)		SYM_FUNC_START(ce_ ## func)
+#define AES_FUNC_END(func)		SYM_FUNC_END(ce_ ## func)
+
+	.arch		armv8-a+crypto
+
+	xtsmask		.req	v16
+	cbciv		.req	v16
+	vctr		.req	v16
+
+	.macro		xts_reload_mask, tmp
+	.endm
+
+	.macro		xts_cts_skip_tw, reg, lbl
+	.endm
+
+	/* preload all round keys */
+	.macro		load_round_keys, rk, nr, tmp
+	add		\tmp, \rk, \nr, sxtw #4
+	sub		\tmp, \tmp, #160
+	ld1		{v17.4s-v20.4s}, [\rk]
+	ld1		{v21.4s-v24.4s}, [\tmp], #64
+	ld1		{v25.4s-v28.4s}, [\tmp], #64
+	ld1		{v29.4s-v31.4s}, [\tmp]
+	.endm
+
+	/* prepare for encryption with key in rk[] */
+	.macro		enc_prepare, rounds, rk, temp
+	load_round_keys	\rk, \rounds, \temp
+	.endm
+
+	/* prepare for encryption (again) but with new key in rk[] */
+	.macro		enc_switch_key, rounds, rk, temp
+	load_round_keys	\rk, \rounds, \temp
+	.endm
+
+	/* prepare for decryption with key in rk[] */
+	.macro		dec_prepare, rounds, rk, temp
+	load_round_keys	\rk, \rounds, \temp
+	.endm
+
+	.macro		do_enc_Nx, de, mc, k, i0, i1, i2, i3, i4
+	aes\de		\i0\().16b, \k\().16b
+	aes\mc		\i0\().16b, \i0\().16b
+	.ifnb		\i1
+	aes\de		\i1\().16b, \k\().16b
+	aes\mc		\i1\().16b, \i1\().16b
+	.ifnb		\i3
+	aes\de		\i2\().16b, \k\().16b
+	aes\mc		\i2\().16b, \i2\().16b
+	aes\de		\i3\().16b, \k\().16b
+	aes\mc		\i3\().16b, \i3\().16b
+	.ifnb		\i4
+	aes\de		\i4\().16b, \k\().16b
+	aes\mc		\i4\().16b, \i4\().16b
+	.endif
+	.endif
+	.endif
+	.endm
+
+	/* up to 5 interleaved encryption rounds with the same round key */
+	.macro		round_Nx, enc, k, i0, i1, i2, i3, i4
+	.ifc		\enc, e
+	do_enc_Nx	e, mc, \k, \i0, \i1, \i2, \i3, \i4
+	.else
+	do_enc_Nx	d, imc, \k, \i0, \i1, \i2, \i3, \i4
+	.endif
+	.endm
+
+	/* up to 5 interleaved final rounds */
+	.macro		fin_round_Nx, de, k, k2, i0, i1, i2, i3, i4
+	aes\de		\i0\().16b, \k\().16b
+	.ifnb		\i1
+	aes\de		\i1\().16b, \k\().16b
+	.ifnb		\i3
+	aes\de		\i2\().16b, \k\().16b
+	aes\de		\i3\().16b, \k\().16b
+	.ifnb		\i4
+	aes\de		\i4\().16b, \k\().16b
+	.endif
+	.endif
+	.endif
+	eor		\i0\().16b, \i0\().16b, \k2\().16b
+	.ifnb		\i1
+	eor		\i1\().16b, \i1\().16b, \k2\().16b
+	.ifnb		\i3
+	eor		\i2\().16b, \i2\().16b, \k2\().16b
+	eor		\i3\().16b, \i3\().16b, \k2\().16b
+	.ifnb		\i4
+	eor		\i4\().16b, \i4\().16b, \k2\().16b
+	.endif
+	.endif
+	.endif
+	.endm
+
+	/* up to 5 interleaved blocks */
+	.macro		do_block_Nx, enc, rounds, i0, i1, i2, i3, i4
+	tbz		\rounds, #2, .L\@	/* 128 bits */
+	round_Nx	\enc, v17, \i0, \i1, \i2, \i3, \i4
+	round_Nx	\enc, v18, \i0, \i1, \i2, \i3, \i4
+	tbz		\rounds, #1, .L\@	/* 192 bits */
+	round_Nx	\enc, v19, \i0, \i1, \i2, \i3, \i4
+	round_Nx	\enc, v20, \i0, \i1, \i2, \i3, \i4
+.L\@:	.irp		key, v21, v22, v23, v24, v25, v26, v27, v28, v29
+	round_Nx	\enc, \key, \i0, \i1, \i2, \i3, \i4
+	.endr
+	fin_round_Nx	\enc, v30, v31, \i0, \i1, \i2, \i3, \i4
+	.endm
+
+	.macro		encrypt_block, in, rounds, t0, t1, t2
+	do_block_Nx	e, \rounds, \in
+	.endm
+
+	.macro		encrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
+	do_block_Nx	e, \rounds, \i0, \i1, \i2, \i3
+	.endm
+
+	.macro		encrypt_block5x, i0, i1, i2, i3, i4, rounds, t0, t1, t2
+	do_block_Nx	e, \rounds, \i0, \i1, \i2, \i3, \i4
+	.endm
+
+	.macro		decrypt_block, in, rounds, t0, t1, t2
+	do_block_Nx	d, \rounds, \in
+	.endm
+
+	.macro		decrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
+	do_block_Nx	d, \rounds, \i0, \i1, \i2, \i3
+	.endm
+
+	.macro		decrypt_block5x, i0, i1, i2, i3, i4, rounds, t0, t1, t2
+	do_block_Nx	d, \rounds, \i0, \i1, \i2, \i3, \i4
+	.endm
+
+#define MAX_STRIDE	5
+
+#include "aes-modes.S"