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, 609 insertions, 0 deletions

diff --git a/crypto/serpent_generic.c b/crypto/serpent_generic.c
new file mode 100644
index 000000000..b21e7606c
--- /dev/null
+++ b/crypto/serpent_generic.c
@@ -0,0 +1,609 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Cryptographic API.
+ *
+ * Serpent Cipher Algorithm.
+ *
+ * Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no>
+ */
+
+#include <crypto/algapi.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/unaligned.h>
+#include <linux/types.h>
+#include <crypto/serpent.h>
+
+/* Key is padded to the maximum of 256 bits before round key generation.
+ * Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
+ */
+
+#define PHI 0x9e3779b9UL
+
+#define keyiter(a, b, c, d, i, j) \
+	({ b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b, 11); k[j] = b; })
+
+#define loadkeys(x0, x1, x2, x3, i) \
+	({ x0 = k[i]; x1 = k[i+1]; x2 = k[i+2]; x3 = k[i+3]; })
+
+#define storekeys(x0, x1, x2, x3, i) \
+	({ k[i] = x0; k[i+1] = x1; k[i+2] = x2; k[i+3] = x3; })
+
+#define store_and_load_keys(x0, x1, x2, x3, s, l) \
+	({ storekeys(x0, x1, x2, x3, s); loadkeys(x0, x1, x2, x3, l); })
+
+#define K(x0, x1, x2, x3, i) ({				\
+	x3 ^= k[4*(i)+3];        x2 ^= k[4*(i)+2];	\
+	x1 ^= k[4*(i)+1];        x0 ^= k[4*(i)+0];	\
+	})
+
+#define LK(x0, x1, x2, x3, x4, i) ({					   \
+							x0 = rol32(x0, 13);\
+	x2 = rol32(x2, 3);	x1 ^= x0;		x4  = x0 << 3;	   \
+	x3 ^= x2;		x1 ^= x2;				   \
+	x1 = rol32(x1, 1);	x3 ^= x4;				   \
+	x3 = rol32(x3, 7);	x4  = x1;				   \
+	x0 ^= x1;		x4 <<= 7;		x2 ^= x3;	   \
+	x0 ^= x3;		x2 ^= x4;		x3 ^= k[4*i+3];	   \
+	x1 ^= k[4*i+1];		x0 = rol32(x0, 5);	x2 = rol32(x2, 22);\
+	x0 ^= k[4*i+0];		x2 ^= k[4*i+2];				   \
+	})
+
+#define KL(x0, x1, x2, x3, x4, i) ({					   \
+	x0 ^= k[4*i+0];		x1 ^= k[4*i+1];		x2 ^= k[4*i+2];	   \
+	x3 ^= k[4*i+3];		x0 = ror32(x0, 5);	x2 = ror32(x2, 22);\
+	x4 =  x1;		x2 ^= x3;		x0 ^= x3;	   \
+	x4 <<= 7;		x0 ^= x1;		x1 = ror32(x1, 1); \
+	x2 ^= x4;		x3 = ror32(x3, 7);	x4 = x0 << 3;	   \
+	x1 ^= x0;		x3 ^= x4;		x0 = ror32(x0, 13);\
+	x1 ^= x2;		x3 ^= x2;		x2 = ror32(x2, 3); \
+	})
+
+#define S0(x0, x1, x2, x3, x4) ({			\
+					x4  = x3;	\
+	x3 |= x0;	x0 ^= x4;	x4 ^= x2;	\
+	x4 = ~x4;	x3 ^= x1;	x1 &= x0;	\
+	x1 ^= x4;	x2 ^= x0;	x0 ^= x3;	\
+	x4 |= x0;	x0 ^= x2;	x2 &= x1;	\
+	x3 ^= x2;	x1 = ~x1;	x2 ^= x4;	\
+	x1 ^= x2;					\
+	})
+
+#define S1(x0, x1, x2, x3, x4) ({			\
+					x4  = x1;	\
+	x1 ^= x0;	x0 ^= x3;	x3 = ~x3;	\
+	x4 &= x1;	x0 |= x1;	x3 ^= x2;	\
+	x0 ^= x3;	x1 ^= x3;	x3 ^= x4;	\
+	x1 |= x4;	x4 ^= x2;	x2 &= x0;	\
+	x2 ^= x1;	x1 |= x0;	x0 = ~x0;	\
+	x0 ^= x2;	x4 ^= x1;			\
+	})
+
+#define S2(x0, x1, x2, x3, x4) ({			\
+					x3 = ~x3;	\
+	x1 ^= x0;	x4  = x0;	x0 &= x2;	\
+	x0 ^= x3;	x3 |= x4;	x2 ^= x1;	\
+	x3 ^= x1;	x1 &= x0;	x0 ^= x2;	\
+	x2 &= x3;	x3 |= x1;	x0 = ~x0;	\
+	x3 ^= x0;	x4 ^= x0;	x0 ^= x2;	\
+	x1 |= x2;					\
+	})
+
+#define S3(x0, x1, x2, x3, x4) ({			\
+					x4  = x1;	\
+	x1 ^= x3;	x3 |= x0;	x4 &= x0;	\
+	x0 ^= x2;	x2 ^= x1;	x1 &= x3;	\
+	x2 ^= x3;	x0 |= x4;	x4 ^= x3;	\
+	x1 ^= x0;	x0 &= x3;	x3 &= x4;	\
+	x3 ^= x2;	x4 |= x1;	x2 &= x1;	\
+	x4 ^= x3;	x0 ^= x3;	x3 ^= x2;	\
+	})
+
+#define S4(x0, x1, x2, x3, x4) ({			\
+					x4  = x3;	\
+	x3 &= x0;	x0 ^= x4;			\
+	x3 ^= x2;	x2 |= x4;	x0 ^= x1;	\
+	x4 ^= x3;	x2 |= x0;			\
+	x2 ^= x1;	x1 &= x0;			\
+	x1 ^= x4;	x4 &= x2;	x2 ^= x3;	\
+	x4 ^= x0;	x3 |= x1;	x1 = ~x1;	\
+	x3 ^= x0;					\
+	})
+
+#define S5(x0, x1, x2, x3, x4) ({			\
+	x4  = x1;	x1 |= x0;			\
+	x2 ^= x1;	x3 = ~x3;	x4 ^= x0;	\
+	x0 ^= x2;	x1 &= x4;	x4 |= x3;	\
+	x4 ^= x0;	x0 &= x3;	x1 ^= x3;	\
+	x3 ^= x2;	x0 ^= x1;	x2 &= x4;	\
+	x1 ^= x2;	x2 &= x0;			\
+	x3 ^= x2;					\
+	})
+
+#define S6(x0, x1, x2, x3, x4) ({			\
+					x4  = x1;	\
+	x3 ^= x0;	x1 ^= x2;	x2 ^= x0;	\
+	x0 &= x3;	x1 |= x3;	x4 = ~x4;	\
+	x0 ^= x1;	x1 ^= x2;			\
+	x3 ^= x4;	x4 ^= x0;	x2 &= x0;	\
+	x4 ^= x1;	x2 ^= x3;	x3 &= x1;	\
+	x3 ^= x0;	x1 ^= x2;			\
+	})
+
+#define S7(x0, x1, x2, x3, x4) ({			\
+					x1 = ~x1;	\
+	x4  = x1;	x0 = ~x0;	x1 &= x2;	\
+	x1 ^= x3;	x3 |= x4;	x4 ^= x2;	\
+	x2 ^= x3;	x3 ^= x0;	x0 |= x1;	\
+	x2 &= x0;	x0 ^= x4;	x4 ^= x3;	\
+	x3 &= x0;	x4 ^= x1;			\
+	x2 ^= x4;	x3 ^= x1;	x4 |= x0;	\
+	x4 ^= x1;					\
+	})
+
+#define SI0(x0, x1, x2, x3, x4) ({			\
+			x4  = x3;	x1 ^= x0;	\
+	x3 |= x1;	x4 ^= x1;	x0 = ~x0;	\
+	x2 ^= x3;	x3 ^= x0;	x0 &= x1;	\
+	x0 ^= x2;	x2 &= x3;	x3 ^= x4;	\
+	x2 ^= x3;	x1 ^= x3;	x3 &= x0;	\
+	x1 ^= x0;	x0 ^= x2;	x4 ^= x3;	\
+	})
+
+#define SI1(x0, x1, x2, x3, x4) ({			\
+	x1 ^= x3;	x4  = x0;			\
+	x0 ^= x2;	x2 = ~x2;	x4 |= x1;	\
+	x4 ^= x3;	x3 &= x1;	x1 ^= x2;	\
+	x2 &= x4;	x4 ^= x1;	x1 |= x3;	\
+	x3 ^= x0;	x2 ^= x0;	x0 |= x4;	\
+	x2 ^= x4;	x1 ^= x0;			\
+	x4 ^= x1;					\
+	})
+
+#define SI2(x0, x1, x2, x3, x4) ({			\
+	x2 ^= x1;	x4  = x3;	x3 = ~x3;	\
+	x3 |= x2;	x2 ^= x4;	x4 ^= x0;	\
+	x3 ^= x1;	x1 |= x2;	x2 ^= x0;	\
+	x1 ^= x4;	x4 |= x3;	x2 ^= x3;	\
+	x4 ^= x2;	x2 &= x1;			\
+	x2 ^= x3;	x3 ^= x4;	x4 ^= x0;	\
+	})
+
+#define SI3(x0, x1, x2, x3, x4) ({			\
+					x2 ^= x1;	\
+	x4  = x1;	x1 &= x2;			\
+	x1 ^= x0;	x0 |= x4;	x4 ^= x3;	\
+	x0 ^= x3;	x3 |= x1;	x1 ^= x2;	\
+	x1 ^= x3;	x0 ^= x2;	x2 ^= x3;	\
+	x3 &= x1;	x1 ^= x0;	x0 &= x2;	\
+	x4 ^= x3;	x3 ^= x0;	x0 ^= x1;	\
+	})
+
+#define SI4(x0, x1, x2, x3, x4) ({			\
+	x2 ^= x3;	x4  = x0;	x0 &= x1;	\
+	x0 ^= x2;	x2 |= x3;	x4 = ~x4;	\
+	x1 ^= x0;	x0 ^= x2;	x2 &= x4;	\
+	x2 ^= x0;	x0 |= x4;			\
+	x0 ^= x3;	x3 &= x2;			\
+	x4 ^= x3;	x3 ^= x1;	x1 &= x0;	\
+	x4 ^= x1;	x0 ^= x3;			\
+	})
+
+#define SI5(x0, x1, x2, x3, x4) ({			\
+			x4  = x1;	x1 |= x2;	\
+	x2 ^= x4;	x1 ^= x3;	x3 &= x4;	\
+	x2 ^= x3;	x3 |= x0;	x0 = ~x0;	\
+	x3 ^= x2;	x2 |= x0;	x4 ^= x1;	\
+	x2 ^= x4;	x4 &= x0;	x0 ^= x1;	\
+	x1 ^= x3;	x0 &= x2;	x2 ^= x3;	\
+	x0 ^= x2;	x2 ^= x4;	x4 ^= x3;	\
+	})
+
+#define SI6(x0, x1, x2, x3, x4) ({			\
+			x0 ^= x2;			\
+	x4  = x0;	x0 &= x3;	x2 ^= x3;	\
+	x0 ^= x2;	x3 ^= x1;	x2 |= x4;	\
+	x2 ^= x3;	x3 &= x0;	x0 = ~x0;	\
+	x3 ^= x1;	x1 &= x2;	x4 ^= x0;	\
+	x3 ^= x4;	x4 ^= x2;	x0 ^= x1;	\
+	x2 ^= x0;					\
+	})
+
+#define SI7(x0, x1, x2, x3, x4) ({			\
+	x4  = x3;	x3 &= x0;	x0 ^= x2;	\
+	x2 |= x4;	x4 ^= x1;	x0 = ~x0;	\
+	x1 |= x3;	x4 ^= x0;	x0 &= x2;	\
+	x0 ^= x1;	x1 &= x2;	x3 ^= x2;	\
+	x4 ^= x3;	x2 &= x3;	x3 |= x0;	\
+	x1 ^= x4;	x3 ^= x4;	x4 &= x0;	\
+	x4 ^= x2;					\
+	})
+
+/*
+ * both gcc and clang have misoptimized this function in the past,
+ * producing horrible object code from spilling temporary variables
+ * on the stack. Forcing this part out of line avoids that.
+ */
+static noinline void __serpent_setkey_sbox(u32 r0, u32 r1, u32 r2,
+					   u32 r3, u32 r4, u32 *k)
+{
+	k += 100;
+	S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24);
+	S4(r1, r2, r4, r3, r0); store_and_load_keys(r2, r4, r3, r0, 24, 20);
+	S5(r2, r4, r3, r0, r1); store_and_load_keys(r1, r2, r4, r0, 20, 16);
+	S6(r1, r2, r4, r0, r3); store_and_load_keys(r4, r3, r2, r0, 16, 12);
+	S7(r4, r3, r2, r0, r1); store_and_load_keys(r1, r2, r0, r4, 12, 8);
+	S0(r1, r2, r0, r4, r3); store_and_load_keys(r0, r2, r4, r1, 8, 4);
+	S1(r0, r2, r4, r1, r3); store_and_load_keys(r3, r4, r1, r0, 4, 0);
+	S2(r3, r4, r1, r0, r2); store_and_load_keys(r2, r4, r3, r0, 0, -4);
+	S3(r2, r4, r3, r0, r1); store_and_load_keys(r0, r1, r4, r2, -4, -8);
+	S4(r0, r1, r4, r2, r3); store_and_load_keys(r1, r4, r2, r3, -8, -12);
+	S5(r1, r4, r2, r3, r0); store_and_load_keys(r0, r1, r4, r3, -12, -16);
+	S6(r0, r1, r4, r3, r2); store_and_load_keys(r4, r2, r1, r3, -16, -20);
+	S7(r4, r2, r1, r3, r0); store_and_load_keys(r0, r1, r3, r4, -20, -24);
+	S0(r0, r1, r3, r4, r2); store_and_load_keys(r3, r1, r4, r0, -24, -28);
+	k -= 50;
+	S1(r3, r1, r4, r0, r2); store_and_load_keys(r2, r4, r0, r3, 22, 18);
+	S2(r2, r4, r0, r3, r1); store_and_load_keys(r1, r4, r2, r3, 18, 14);
+	S3(r1, r4, r2, r3, r0); store_and_load_keys(r3, r0, r4, r1, 14, 10);
+	S4(r3, r0, r4, r1, r2); store_and_load_keys(r0, r4, r1, r2, 10, 6);
+	S5(r0, r4, r1, r2, r3); store_and_load_keys(r3, r0, r4, r2, 6, 2);
+	S6(r3, r0, r4, r2, r1); store_and_load_keys(r4, r1, r0, r2, 2, -2);
+	S7(r4, r1, r0, r2, r3); store_and_load_keys(r3, r0, r2, r4, -2, -6);
+	S0(r3, r0, r2, r4, r1); store_and_load_keys(r2, r0, r4, r3, -6, -10);
+	S1(r2, r0, r4, r3, r1); store_and_load_keys(r1, r4, r3, r2, -10, -14);
+	S2(r1, r4, r3, r2, r0); store_and_load_keys(r0, r4, r1, r2, -14, -18);
+	S3(r0, r4, r1, r2, r3); store_and_load_keys(r2, r3, r4, r0, -18, -22);
+	k -= 50;
+	S4(r2, r3, r4, r0, r1); store_and_load_keys(r3, r4, r0, r1, 28, 24);
+	S5(r3, r4, r0, r1, r2); store_and_load_keys(r2, r3, r4, r1, 24, 20);
+	S6(r2, r3, r4, r1, r0); store_and_load_keys(r4, r0, r3, r1, 20, 16);
+	S7(r4, r0, r3, r1, r2); store_and_load_keys(r2, r3, r1, r4, 16, 12);
+	S0(r2, r3, r1, r4, r0); store_and_load_keys(r1, r3, r4, r2, 12, 8);
+	S1(r1, r3, r4, r2, r0); store_and_load_keys(r0, r4, r2, r1, 8, 4);
+	S2(r0, r4, r2, r1, r3); store_and_load_keys(r3, r4, r0, r1, 4, 0);
+	S3(r3, r4, r0, r1, r2); storekeys(r1, r2, r4, r3, 0);
+}
+
+int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key,
+		     unsigned int keylen)
+{
+	u32 *k = ctx->expkey;
+	u8  *k8 = (u8 *)k;
+	u32 r0, r1, r2, r3, r4;
+	__le32 *lk;
+	int i;
+
+	/* Copy key, add padding */
+
+	for (i = 0; i < keylen; ++i)
+		k8[i] = key[i];
+	if (i < SERPENT_MAX_KEY_SIZE)
+		k8[i++] = 1;
+	while (i < SERPENT_MAX_KEY_SIZE)
+		k8[i++] = 0;
+
+	lk = (__le32 *)k;
+	k[0] = le32_to_cpu(lk[0]);
+	k[1] = le32_to_cpu(lk[1]);
+	k[2] = le32_to_cpu(lk[2]);
+	k[3] = le32_to_cpu(lk[3]);
+	k[4] = le32_to_cpu(lk[4]);
+	k[5] = le32_to_cpu(lk[5]);
+	k[6] = le32_to_cpu(lk[6]);
+	k[7] = le32_to_cpu(lk[7]);
+
+	/* Expand key using polynomial */
+
+	r0 = k[3];
+	r1 = k[4];
+	r2 = k[5];
+	r3 = k[6];
+	r4 = k[7];
+
+	keyiter(k[0], r0, r4, r2, 0, 0);
+	keyiter(k[1], r1, r0, r3, 1, 1);
+	keyiter(k[2], r2, r1, r4, 2, 2);
+	keyiter(k[3], r3, r2, r0, 3, 3);
+	keyiter(k[4], r4, r3, r1, 4, 4);
+	keyiter(k[5], r0, r4, r2, 5, 5);
+	keyiter(k[6], r1, r0, r3, 6, 6);
+	keyiter(k[7], r2, r1, r4, 7, 7);
+
+	keyiter(k[0], r3, r2, r0, 8, 8);
+	keyiter(k[1], r4, r3, r1, 9, 9);
+	keyiter(k[2], r0, r4, r2, 10, 10);
+	keyiter(k[3], r1, r0, r3, 11, 11);
+	keyiter(k[4], r2, r1, r4, 12, 12);
+	keyiter(k[5], r3, r2, r0, 13, 13);
+	keyiter(k[6], r4, r3, r1, 14, 14);
+	keyiter(k[7], r0, r4, r2, 15, 15);
+	keyiter(k[8], r1, r0, r3, 16, 16);
+	keyiter(k[9], r2, r1, r4, 17, 17);
+	keyiter(k[10], r3, r2, r0, 18, 18);
+	keyiter(k[11], r4, r3, r1, 19, 19);
+	keyiter(k[12], r0, r4, r2, 20, 20);
+	keyiter(k[13], r1, r0, r3, 21, 21);
+	keyiter(k[14], r2, r1, r4, 22, 22);
+	keyiter(k[15], r3, r2, r0, 23, 23);
+	keyiter(k[16], r4, r3, r1, 24, 24);
+	keyiter(k[17], r0, r4, r2, 25, 25);
+	keyiter(k[18], r1, r0, r3, 26, 26);
+	keyiter(k[19], r2, r1, r4, 27, 27);
+	keyiter(k[20], r3, r2, r0, 28, 28);
+	keyiter(k[21], r4, r3, r1, 29, 29);
+	keyiter(k[22], r0, r4, r2, 30, 30);
+	keyiter(k[23], r1, r0, r3, 31, 31);
+
+	k += 50;
+
+	keyiter(k[-26], r2, r1, r4, 32, -18);
+	keyiter(k[-25], r3, r2, r0, 33, -17);
+	keyiter(k[-24], r4, r3, r1, 34, -16);
+	keyiter(k[-23], r0, r4, r2, 35, -15);
+	keyiter(k[-22], r1, r0, r3, 36, -14);
+	keyiter(k[-21], r2, r1, r4, 37, -13);
+	keyiter(k[-20], r3, r2, r0, 38, -12);
+	keyiter(k[-19], r4, r3, r1, 39, -11);
+	keyiter(k[-18], r0, r4, r2, 40, -10);
+	keyiter(k[-17], r1, r0, r3, 41, -9);
+	keyiter(k[-16], r2, r1, r4, 42, -8);
+	keyiter(k[-15], r3, r2, r0, 43, -7);
+	keyiter(k[-14], r4, r3, r1, 44, -6);
+	keyiter(k[-13], r0, r4, r2, 45, -5);
+	keyiter(k[-12], r1, r0, r3, 46, -4);
+	keyiter(k[-11], r2, r1, r4, 47, -3);
+	keyiter(k[-10], r3, r2, r0, 48, -2);
+	keyiter(k[-9], r4, r3, r1, 49, -1);
+	keyiter(k[-8], r0, r4, r2, 50, 0);
+	keyiter(k[-7], r1, r0, r3, 51, 1);
+	keyiter(k[-6], r2, r1, r4, 52, 2);
+	keyiter(k[-5], r3, r2, r0, 53, 3);
+	keyiter(k[-4], r4, r3, r1, 54, 4);
+	keyiter(k[-3], r0, r4, r2, 55, 5);
+	keyiter(k[-2], r1, r0, r3, 56, 6);
+	keyiter(k[-1], r2, r1, r4, 57, 7);
+	keyiter(k[0], r3, r2, r0, 58, 8);
+	keyiter(k[1], r4, r3, r1, 59, 9);
+	keyiter(k[2], r0, r4, r2, 60, 10);
+	keyiter(k[3], r1, r0, r3, 61, 11);
+	keyiter(k[4], r2, r1, r4, 62, 12);
+	keyiter(k[5], r3, r2, r0, 63, 13);
+	keyiter(k[6], r4, r3, r1, 64, 14);
+	keyiter(k[7], r0, r4, r2, 65, 15);
+	keyiter(k[8], r1, r0, r3, 66, 16);
+	keyiter(k[9], r2, r1, r4, 67, 17);
+	keyiter(k[10], r3, r2, r0, 68, 18);
+	keyiter(k[11], r4, r3, r1, 69, 19);
+	keyiter(k[12], r0, r4, r2, 70, 20);
+	keyiter(k[13], r1, r0, r3, 71, 21);
+	keyiter(k[14], r2, r1, r4, 72, 22);
+	keyiter(k[15], r3, r2, r0, 73, 23);
+	keyiter(k[16], r4, r3, r1, 74, 24);
+	keyiter(k[17], r0, r4, r2, 75, 25);
+	keyiter(k[18], r1, r0, r3, 76, 26);
+	keyiter(k[19], r2, r1, r4, 77, 27);
+	keyiter(k[20], r3, r2, r0, 78, 28);
+	keyiter(k[21], r4, r3, r1, 79, 29);
+	keyiter(k[22], r0, r4, r2, 80, 30);
+	keyiter(k[23], r1, r0, r3, 81, 31);
+
+	k += 50;
+
+	keyiter(k[-26], r2, r1, r4, 82, -18);
+	keyiter(k[-25], r3, r2, r0, 83, -17);
+	keyiter(k[-24], r4, r3, r1, 84, -16);
+	keyiter(k[-23], r0, r4, r2, 85, -15);
+	keyiter(k[-22], r1, r0, r3, 86, -14);
+	keyiter(k[-21], r2, r1, r4, 87, -13);
+	keyiter(k[-20], r3, r2, r0, 88, -12);
+	keyiter(k[-19], r4, r3, r1, 89, -11);
+	keyiter(k[-18], r0, r4, r2, 90, -10);
+	keyiter(k[-17], r1, r0, r3, 91, -9);
+	keyiter(k[-16], r2, r1, r4, 92, -8);
+	keyiter(k[-15], r3, r2, r0, 93, -7);
+	keyiter(k[-14], r4, r3, r1, 94, -6);
+	keyiter(k[-13], r0, r4, r2, 95, -5);
+	keyiter(k[-12], r1, r0, r3, 96, -4);
+	keyiter(k[-11], r2, r1, r4, 97, -3);
+	keyiter(k[-10], r3, r2, r0, 98, -2);
+	keyiter(k[-9], r4, r3, r1, 99, -1);
+	keyiter(k[-8], r0, r4, r2, 100, 0);
+	keyiter(k[-7], r1, r0, r3, 101, 1);
+	keyiter(k[-6], r2, r1, r4, 102, 2);
+	keyiter(k[-5], r3, r2, r0, 103, 3);
+	keyiter(k[-4], r4, r3, r1, 104, 4);
+	keyiter(k[-3], r0, r4, r2, 105, 5);
+	keyiter(k[-2], r1, r0, r3, 106, 6);
+	keyiter(k[-1], r2, r1, r4, 107, 7);
+	keyiter(k[0], r3, r2, r0, 108, 8);
+	keyiter(k[1], r4, r3, r1, 109, 9);
+	keyiter(k[2], r0, r4, r2, 110, 10);
+	keyiter(k[3], r1, r0, r3, 111, 11);
+	keyiter(k[4], r2, r1, r4, 112, 12);
+	keyiter(k[5], r3, r2, r0, 113, 13);
+	keyiter(k[6], r4, r3, r1, 114, 14);
+	keyiter(k[7], r0, r4, r2, 115, 15);
+	keyiter(k[8], r1, r0, r3, 116, 16);
+	keyiter(k[9], r2, r1, r4, 117, 17);
+	keyiter(k[10], r3, r2, r0, 118, 18);
+	keyiter(k[11], r4, r3, r1, 119, 19);
+	keyiter(k[12], r0, r4, r2, 120, 20);
+	keyiter(k[13], r1, r0, r3, 121, 21);
+	keyiter(k[14], r2, r1, r4, 122, 22);
+	keyiter(k[15], r3, r2, r0, 123, 23);
+	keyiter(k[16], r4, r3, r1, 124, 24);
+	keyiter(k[17], r0, r4, r2, 125, 25);
+	keyiter(k[18], r1, r0, r3, 126, 26);
+	keyiter(k[19], r2, r1, r4, 127, 27);
+	keyiter(k[20], r3, r2, r0, 128, 28);
+	keyiter(k[21], r4, r3, r1, 129, 29);
+	keyiter(k[22], r0, r4, r2, 130, 30);
+	keyiter(k[23], r1, r0, r3, 131, 31);
+
+	/* Apply S-boxes */
+	__serpent_setkey_sbox(r0, r1, r2, r3, r4, ctx->expkey);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__serpent_setkey);
+
+int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
+{
+	return __serpent_setkey(crypto_tfm_ctx(tfm), key, keylen);
+}
+EXPORT_SYMBOL_GPL(serpent_setkey);
+
+void __serpent_encrypt(const void *c, u8 *dst, const u8 *src)
+{
+	const struct serpent_ctx *ctx = c;
+	const u32 *k = ctx->expkey;
+	u32	r0, r1, r2, r3, r4;
+
+	r0 = get_unaligned_le32(src);
+	r1 = get_unaligned_le32(src + 4);
+	r2 = get_unaligned_le32(src + 8);
+	r3 = get_unaligned_le32(src + 12);
+
+					K(r0, r1, r2, r3, 0);
+	S0(r0, r1, r2, r3, r4);		LK(r2, r1, r3, r0, r4, 1);
+	S1(r2, r1, r3, r0, r4);		LK(r4, r3, r0, r2, r1, 2);
+	S2(r4, r3, r0, r2, r1);		LK(r1, r3, r4, r2, r0, 3);
+	S3(r1, r3, r4, r2, r0);		LK(r2, r0, r3, r1, r4, 4);
+	S4(r2, r0, r3, r1, r4);		LK(r0, r3, r1, r4, r2, 5);
+	S5(r0, r3, r1, r4, r2);		LK(r2, r0, r3, r4, r1, 6);
+	S6(r2, r0, r3, r4, r1);		LK(r3, r1, r0, r4, r2, 7);
+	S7(r3, r1, r0, r4, r2);		LK(r2, r0, r4, r3, r1, 8);
+	S0(r2, r0, r4, r3, r1);		LK(r4, r0, r3, r2, r1, 9);
+	S1(r4, r0, r3, r2, r1);		LK(r1, r3, r2, r4, r0, 10);
+	S2(r1, r3, r2, r4, r0);		LK(r0, r3, r1, r4, r2, 11);
+	S3(r0, r3, r1, r4, r2);		LK(r4, r2, r3, r0, r1, 12);
+	S4(r4, r2, r3, r0, r1);		LK(r2, r3, r0, r1, r4, 13);
+	S5(r2, r3, r0, r1, r4);		LK(r4, r2, r3, r1, r0, 14);
+	S6(r4, r2, r3, r1, r0);		LK(r3, r0, r2, r1, r4, 15);
+	S7(r3, r0, r2, r1, r4);		LK(r4, r2, r1, r3, r0, 16);
+	S0(r4, r2, r1, r3, r0);		LK(r1, r2, r3, r4, r0, 17);
+	S1(r1, r2, r3, r4, r0);		LK(r0, r3, r4, r1, r2, 18);
+	S2(r0, r3, r4, r1, r2);		LK(r2, r3, r0, r1, r4, 19);
+	S3(r2, r3, r0, r1, r4);		LK(r1, r4, r3, r2, r0, 20);
+	S4(r1, r4, r3, r2, r0);		LK(r4, r3, r2, r0, r1, 21);
+	S5(r4, r3, r2, r0, r1);		LK(r1, r4, r3, r0, r2, 22);
+	S6(r1, r4, r3, r0, r2);		LK(r3, r2, r4, r0, r1, 23);
+	S7(r3, r2, r4, r0, r1);		LK(r1, r4, r0, r3, r2, 24);
+	S0(r1, r4, r0, r3, r2);		LK(r0, r4, r3, r1, r2, 25);
+	S1(r0, r4, r3, r1, r2);		LK(r2, r3, r1, r0, r4, 26);
+	S2(r2, r3, r1, r0, r4);		LK(r4, r3, r2, r0, r1, 27);
+	S3(r4, r3, r2, r0, r1);		LK(r0, r1, r3, r4, r2, 28);
+	S4(r0, r1, r3, r4, r2);		LK(r1, r3, r4, r2, r0, 29);
+	S5(r1, r3, r4, r2, r0);		LK(r0, r1, r3, r2, r4, 30);
+	S6(r0, r1, r3, r2, r4);		LK(r3, r4, r1, r2, r0, 31);
+	S7(r3, r4, r1, r2, r0);		K(r0, r1, r2, r3, 32);
+
+	put_unaligned_le32(r0, dst);
+	put_unaligned_le32(r1, dst + 4);
+	put_unaligned_le32(r2, dst + 8);
+	put_unaligned_le32(r3, dst + 12);
+}
+EXPORT_SYMBOL_GPL(__serpent_encrypt);
+
+static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+	struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	__serpent_encrypt(ctx, dst, src);
+}
+
+void __serpent_decrypt(const void *c, u8 *dst, const u8 *src)
+{
+	const struct serpent_ctx *ctx = c;
+	const u32 *k = ctx->expkey;
+	u32	r0, r1, r2, r3, r4;
+
+	r0 = get_unaligned_le32(src);
+	r1 = get_unaligned_le32(src + 4);
+	r2 = get_unaligned_le32(src + 8);
+	r3 = get_unaligned_le32(src + 12);
+
+					K(r0, r1, r2, r3, 32);
+	SI7(r0, r1, r2, r3, r4);	KL(r1, r3, r0, r4, r2, 31);
+	SI6(r1, r3, r0, r4, r2);	KL(r0, r2, r4, r1, r3, 30);
+	SI5(r0, r2, r4, r1, r3);	KL(r2, r3, r0, r4, r1, 29);
+	SI4(r2, r3, r0, r4, r1);	KL(r2, r0, r1, r4, r3, 28);
+	SI3(r2, r0, r1, r4, r3);	KL(r1, r2, r3, r4, r0, 27);
+	SI2(r1, r2, r3, r4, r0);	KL(r2, r0, r4, r3, r1, 26);
+	SI1(r2, r0, r4, r3, r1);	KL(r1, r0, r4, r3, r2, 25);
+	SI0(r1, r0, r4, r3, r2);	KL(r4, r2, r0, r1, r3, 24);
+	SI7(r4, r2, r0, r1, r3);	KL(r2, r1, r4, r3, r0, 23);
+	SI6(r2, r1, r4, r3, r0);	KL(r4, r0, r3, r2, r1, 22);
+	SI5(r4, r0, r3, r2, r1);	KL(r0, r1, r4, r3, r2, 21);
+	SI4(r0, r1, r4, r3, r2);	KL(r0, r4, r2, r3, r1, 20);
+	SI3(r0, r4, r2, r3, r1);	KL(r2, r0, r1, r3, r4, 19);
+	SI2(r2, r0, r1, r3, r4);	KL(r0, r4, r3, r1, r2, 18);
+	SI1(r0, r4, r3, r1, r2);	KL(r2, r4, r3, r1, r0, 17);
+	SI0(r2, r4, r3, r1, r0);	KL(r3, r0, r4, r2, r1, 16);
+	SI7(r3, r0, r4, r2, r1);	KL(r0, r2, r3, r1, r4, 15);
+	SI6(r0, r2, r3, r1, r4);	KL(r3, r4, r1, r0, r2, 14);
+	SI5(r3, r4, r1, r0, r2);	KL(r4, r2, r3, r1, r0, 13);
+	SI4(r4, r2, r3, r1, r0);	KL(r4, r3, r0, r1, r2, 12);
+	SI3(r4, r3, r0, r1, r2);	KL(r0, r4, r2, r1, r3, 11);
+	SI2(r0, r4, r2, r1, r3);	KL(r4, r3, r1, r2, r0, 10);
+	SI1(r4, r3, r1, r2, r0);	KL(r0, r3, r1, r2, r4, 9);
+	SI0(r0, r3, r1, r2, r4);	KL(r1, r4, r3, r0, r2, 8);
+	SI7(r1, r4, r3, r0, r2);	KL(r4, r0, r1, r2, r3, 7);
+	SI6(r4, r0, r1, r2, r3);	KL(r1, r3, r2, r4, r0, 6);
+	SI5(r1, r3, r2, r4, r0);	KL(r3, r0, r1, r2, r4, 5);
+	SI4(r3, r0, r1, r2, r4);	KL(r3, r1, r4, r2, r0, 4);
+	SI3(r3, r1, r4, r2, r0);	KL(r4, r3, r0, r2, r1, 3);
+	SI2(r4, r3, r0, r2, r1);	KL(r3, r1, r2, r0, r4, 2);
+	SI1(r3, r1, r2, r0, r4);	KL(r4, r1, r2, r0, r3, 1);
+	SI0(r4, r1, r2, r0, r3);	K(r2, r3, r1, r4, 0);
+
+	put_unaligned_le32(r2, dst);
+	put_unaligned_le32(r3, dst + 4);
+	put_unaligned_le32(r1, dst + 8);
+	put_unaligned_le32(r4, dst + 12);
+}
+EXPORT_SYMBOL_GPL(__serpent_decrypt);
+
+static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+	struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	__serpent_decrypt(ctx, dst, src);
+}
+
+static struct crypto_alg srp_alg = {
+	.cra_name		=	"serpent",
+	.cra_driver_name	=	"serpent-generic",
+	.cra_priority		=	100,
+	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
+	.cra_blocksize		=	SERPENT_BLOCK_SIZE,
+	.cra_ctxsize		=	sizeof(struct serpent_ctx),
+	.cra_module		=	THIS_MODULE,
+	.cra_u			=	{ .cipher = {
+	.cia_min_keysize	=	SERPENT_MIN_KEY_SIZE,
+	.cia_max_keysize	=	SERPENT_MAX_KEY_SIZE,
+	.cia_setkey		=	serpent_setkey,
+	.cia_encrypt		=	serpent_encrypt,
+	.cia_decrypt		=	serpent_decrypt } }
+};
+
+static int __init serpent_mod_init(void)
+{
+	return crypto_register_alg(&srp_alg);
+}
+
+static void __exit serpent_mod_fini(void)
+{
+	crypto_unregister_alg(&srp_alg);
+}
+
+module_init(serpent_mod_init);
+module_exit(serpent_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Serpent Cipher Algorithm");
+MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
+MODULE_ALIAS_CRYPTO("serpent");
+MODULE_ALIAS_CRYPTO("serpent-generic");