From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops 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 --- crypto/cast6_generic.c | 280 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 280 insertions(+) create mode 100644 crypto/cast6_generic.c (limited to 'crypto/cast6_generic.c') diff --git a/crypto/cast6_generic.c b/crypto/cast6_generic.c new file mode 100644 index 000000000..4c08c4264 --- /dev/null +++ b/crypto/cast6_generic.c @@ -0,0 +1,280 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Kernel cryptographic api. + * cast6.c - Cast6 cipher algorithm [rfc2612]. + * + * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN) + * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption + * algorithm. + * + * Copyright (C) 2003 Kartikey Mahendra Bhatt . + */ + + +#include +#include +#include +#include +#include +#include +#include +#include + +#define s1 cast_s1 +#define s2 cast_s2 +#define s3 cast_s3 +#define s4 cast_s4 + +#define F1(D, r, m) ((I = ((m) + (D))), (I = rol32(I, (r))), \ + (((s1[I >> 24] ^ s2[(I>>16)&0xff]) - s3[(I>>8)&0xff]) + s4[I&0xff])) +#define F2(D, r, m) ((I = ((m) ^ (D))), (I = rol32(I, (r))), \ + (((s1[I >> 24] - s2[(I>>16)&0xff]) + s3[(I>>8)&0xff]) ^ s4[I&0xff])) +#define F3(D, r, m) ((I = ((m) - (D))), (I = rol32(I, (r))), \ + (((s1[I >> 24] + s2[(I>>16)&0xff]) ^ s3[(I>>8)&0xff]) - s4[I&0xff])) + +static const u32 Tm[24][8] = { + { 0x5a827999, 0xc95c653a, 0x383650db, 0xa7103c7c, 0x15ea281d, + 0x84c413be, 0xf39dff5f, 0x6277eb00 } , + { 0xd151d6a1, 0x402bc242, 0xaf05ade3, 0x1ddf9984, 0x8cb98525, + 0xfb9370c6, 0x6a6d5c67, 0xd9474808 } , + { 0x482133a9, 0xb6fb1f4a, 0x25d50aeb, 0x94aef68c, 0x0388e22d, + 0x7262cdce, 0xe13cb96f, 0x5016a510 } , + { 0xbef090b1, 0x2dca7c52, 0x9ca467f3, 0x0b7e5394, 0x7a583f35, + 0xe9322ad6, 0x580c1677, 0xc6e60218 } , + { 0x35bfedb9, 0xa499d95a, 0x1373c4fb, 0x824db09c, 0xf1279c3d, + 0x600187de, 0xcedb737f, 0x3db55f20 } , + { 0xac8f4ac1, 0x1b693662, 0x8a432203, 0xf91d0da4, 0x67f6f945, + 0xd6d0e4e6, 0x45aad087, 0xb484bc28 } , + { 0x235ea7c9, 0x9238936a, 0x01127f0b, 0x6fec6aac, 0xdec6564d, + 0x4da041ee, 0xbc7a2d8f, 0x2b541930 } , + { 0x9a2e04d1, 0x0907f072, 0x77e1dc13, 0xe6bbc7b4, 0x5595b355, + 0xc46f9ef6, 0x33498a97, 0xa2237638 } , + { 0x10fd61d9, 0x7fd74d7a, 0xeeb1391b, 0x5d8b24bc, 0xcc65105d, + 0x3b3efbfe, 0xaa18e79f, 0x18f2d340 } , + { 0x87ccbee1, 0xf6a6aa82, 0x65809623, 0xd45a81c4, 0x43346d65, + 0xb20e5906, 0x20e844a7, 0x8fc23048 } , + { 0xfe9c1be9, 0x6d76078a, 0xdc4ff32b, 0x4b29decc, 0xba03ca6d, + 0x28ddb60e, 0x97b7a1af, 0x06918d50 } , + { 0x756b78f1, 0xe4456492, 0x531f5033, 0xc1f93bd4, 0x30d32775, + 0x9fad1316, 0x0e86feb7, 0x7d60ea58 } , + { 0xec3ad5f9, 0x5b14c19a, 0xc9eead3b, 0x38c898dc, 0xa7a2847d, + 0x167c701e, 0x85565bbf, 0xf4304760 } , + { 0x630a3301, 0xd1e41ea2, 0x40be0a43, 0xaf97f5e4, 0x1e71e185, + 0x8d4bcd26, 0xfc25b8c7, 0x6affa468 } , + { 0xd9d99009, 0x48b37baa, 0xb78d674b, 0x266752ec, 0x95413e8d, + 0x041b2a2e, 0x72f515cf, 0xe1cf0170 } , + { 0x50a8ed11, 0xbf82d8b2, 0x2e5cc453, 0x9d36aff4, 0x0c109b95, + 0x7aea8736, 0xe9c472d7, 0x589e5e78 } , + { 0xc7784a19, 0x365235ba, 0xa52c215b, 0x14060cfc, 0x82dff89d, + 0xf1b9e43e, 0x6093cfdf, 0xcf6dbb80 } , + { 0x3e47a721, 0xad2192c2, 0x1bfb7e63, 0x8ad56a04, 0xf9af55a5, + 0x68894146, 0xd7632ce7, 0x463d1888 } , + { 0xb5170429, 0x23f0efca, 0x92cadb6b, 0x01a4c70c, 0x707eb2ad, + 0xdf589e4e, 0x4e3289ef, 0xbd0c7590 } , + { 0x2be66131, 0x9ac04cd2, 0x099a3873, 0x78742414, 0xe74e0fb5, + 0x5627fb56, 0xc501e6f7, 0x33dbd298 } , + { 0xa2b5be39, 0x118fa9da, 0x8069957b, 0xef43811c, 0x5e1d6cbd, + 0xccf7585e, 0x3bd143ff, 0xaaab2fa0 } , + { 0x19851b41, 0x885f06e2, 0xf738f283, 0x6612de24, 0xd4ecc9c5, + 0x43c6b566, 0xb2a0a107, 0x217a8ca8 } , + { 0x90547849, 0xff2e63ea, 0x6e084f8b, 0xdce23b2c, 0x4bbc26cd, + 0xba96126e, 0x296ffe0f, 0x9849e9b0 } , + { 0x0723d551, 0x75fdc0f2, 0xe4d7ac93, 0x53b19834, 0xc28b83d5, + 0x31656f76, 0xa03f5b17, 0x0f1946b8 } +}; + +static const u8 Tr[4][8] = { + { 0x13, 0x04, 0x15, 0x06, 0x17, 0x08, 0x19, 0x0a } , + { 0x1b, 0x0c, 0x1d, 0x0e, 0x1f, 0x10, 0x01, 0x12 } , + { 0x03, 0x14, 0x05, 0x16, 0x07, 0x18, 0x09, 0x1a } , + { 0x0b, 0x1c, 0x0d, 0x1e, 0x0f, 0x00, 0x11, 0x02 } +}; + +/* forward octave */ +static inline void W(u32 *key, unsigned int i) +{ + u32 I; + key[6] ^= F1(key[7], Tr[i % 4][0], Tm[i][0]); + key[5] ^= F2(key[6], Tr[i % 4][1], Tm[i][1]); + key[4] ^= F3(key[5], Tr[i % 4][2], Tm[i][2]); + key[3] ^= F1(key[4], Tr[i % 4][3], Tm[i][3]); + key[2] ^= F2(key[3], Tr[i % 4][4], Tm[i][4]); + key[1] ^= F3(key[2], Tr[i % 4][5], Tm[i][5]); + key[0] ^= F1(key[1], Tr[i % 4][6], Tm[i][6]); + key[7] ^= F2(key[0], Tr[i % 4][7], Tm[i][7]); +} + +int __cast6_setkey(struct cast6_ctx *c, const u8 *in_key, unsigned int key_len) +{ + int i; + u32 key[8]; + __be32 p_key[8]; /* padded key */ + + if (key_len % 4 != 0) + return -EINVAL; + + memset(p_key, 0, 32); + memcpy(p_key, in_key, key_len); + + key[0] = be32_to_cpu(p_key[0]); /* A */ + key[1] = be32_to_cpu(p_key[1]); /* B */ + key[2] = be32_to_cpu(p_key[2]); /* C */ + key[3] = be32_to_cpu(p_key[3]); /* D */ + key[4] = be32_to_cpu(p_key[4]); /* E */ + key[5] = be32_to_cpu(p_key[5]); /* F */ + key[6] = be32_to_cpu(p_key[6]); /* G */ + key[7] = be32_to_cpu(p_key[7]); /* H */ + + for (i = 0; i < 12; i++) { + W(key, 2 * i); + W(key, 2 * i + 1); + + c->Kr[i][0] = key[0] & 0x1f; + c->Kr[i][1] = key[2] & 0x1f; + c->Kr[i][2] = key[4] & 0x1f; + c->Kr[i][3] = key[6] & 0x1f; + + c->Km[i][0] = key[7]; + c->Km[i][1] = key[5]; + c->Km[i][2] = key[3]; + c->Km[i][3] = key[1]; + } + + return 0; +} +EXPORT_SYMBOL_GPL(__cast6_setkey); + +int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) +{ + return __cast6_setkey(crypto_tfm_ctx(tfm), key, keylen); +} +EXPORT_SYMBOL_GPL(cast6_setkey); + +/*forward quad round*/ +static inline void Q(u32 *block, const u8 *Kr, const u32 *Km) +{ + u32 I; + block[2] ^= F1(block[3], Kr[0], Km[0]); + block[1] ^= F2(block[2], Kr[1], Km[1]); + block[0] ^= F3(block[1], Kr[2], Km[2]); + block[3] ^= F1(block[0], Kr[3], Km[3]); +} + +/*reverse quad round*/ +static inline void QBAR(u32 *block, const u8 *Kr, const u32 *Km) +{ + u32 I; + block[3] ^= F1(block[0], Kr[3], Km[3]); + block[0] ^= F3(block[1], Kr[2], Km[2]); + block[1] ^= F2(block[2], Kr[1], Km[1]); + block[2] ^= F1(block[3], Kr[0], Km[0]); +} + +void __cast6_encrypt(const void *ctx, u8 *outbuf, const u8 *inbuf) +{ + const struct cast6_ctx *c = ctx; + u32 block[4]; + const u32 *Km; + const u8 *Kr; + + block[0] = get_unaligned_be32(inbuf); + block[1] = get_unaligned_be32(inbuf + 4); + block[2] = get_unaligned_be32(inbuf + 8); + block[3] = get_unaligned_be32(inbuf + 12); + + Km = c->Km[0]; Kr = c->Kr[0]; Q(block, Kr, Km); + Km = c->Km[1]; Kr = c->Kr[1]; Q(block, Kr, Km); + Km = c->Km[2]; Kr = c->Kr[2]; Q(block, Kr, Km); + Km = c->Km[3]; Kr = c->Kr[3]; Q(block, Kr, Km); + Km = c->Km[4]; Kr = c->Kr[4]; Q(block, Kr, Km); + Km = c->Km[5]; Kr = c->Kr[5]; Q(block, Kr, Km); + Km = c->Km[6]; Kr = c->Kr[6]; QBAR(block, Kr, Km); + Km = c->Km[7]; Kr = c->Kr[7]; QBAR(block, Kr, Km); + Km = c->Km[8]; Kr = c->Kr[8]; QBAR(block, Kr, Km); + Km = c->Km[9]; Kr = c->Kr[9]; QBAR(block, Kr, Km); + Km = c->Km[10]; Kr = c->Kr[10]; QBAR(block, Kr, Km); + Km = c->Km[11]; Kr = c->Kr[11]; QBAR(block, Kr, Km); + + put_unaligned_be32(block[0], outbuf); + put_unaligned_be32(block[1], outbuf + 4); + put_unaligned_be32(block[2], outbuf + 8); + put_unaligned_be32(block[3], outbuf + 12); +} +EXPORT_SYMBOL_GPL(__cast6_encrypt); + +static void cast6_encrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf) +{ + __cast6_encrypt(crypto_tfm_ctx(tfm), outbuf, inbuf); +} + +void __cast6_decrypt(const void *ctx, u8 *outbuf, const u8 *inbuf) +{ + const struct cast6_ctx *c = ctx; + u32 block[4]; + const u32 *Km; + const u8 *Kr; + + block[0] = get_unaligned_be32(inbuf); + block[1] = get_unaligned_be32(inbuf + 4); + block[2] = get_unaligned_be32(inbuf + 8); + block[3] = get_unaligned_be32(inbuf + 12); + + Km = c->Km[11]; Kr = c->Kr[11]; Q(block, Kr, Km); + Km = c->Km[10]; Kr = c->Kr[10]; Q(block, Kr, Km); + Km = c->Km[9]; Kr = c->Kr[9]; Q(block, Kr, Km); + Km = c->Km[8]; Kr = c->Kr[8]; Q(block, Kr, Km); + Km = c->Km[7]; Kr = c->Kr[7]; Q(block, Kr, Km); + Km = c->Km[6]; Kr = c->Kr[6]; Q(block, Kr, Km); + Km = c->Km[5]; Kr = c->Kr[5]; QBAR(block, Kr, Km); + Km = c->Km[4]; Kr = c->Kr[4]; QBAR(block, Kr, Km); + Km = c->Km[3]; Kr = c->Kr[3]; QBAR(block, Kr, Km); + Km = c->Km[2]; Kr = c->Kr[2]; QBAR(block, Kr, Km); + Km = c->Km[1]; Kr = c->Kr[1]; QBAR(block, Kr, Km); + Km = c->Km[0]; Kr = c->Kr[0]; QBAR(block, Kr, Km); + + put_unaligned_be32(block[0], outbuf); + put_unaligned_be32(block[1], outbuf + 4); + put_unaligned_be32(block[2], outbuf + 8); + put_unaligned_be32(block[3], outbuf + 12); +} +EXPORT_SYMBOL_GPL(__cast6_decrypt); + +static void cast6_decrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf) +{ + __cast6_decrypt(crypto_tfm_ctx(tfm), outbuf, inbuf); +} + +static struct crypto_alg alg = { + .cra_name = "cast6", + .cra_driver_name = "cast6-generic", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_CIPHER, + .cra_blocksize = CAST6_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct cast6_ctx), + .cra_module = THIS_MODULE, + .cra_u = { + .cipher = { + .cia_min_keysize = CAST6_MIN_KEY_SIZE, + .cia_max_keysize = CAST6_MAX_KEY_SIZE, + .cia_setkey = cast6_setkey, + .cia_encrypt = cast6_encrypt, + .cia_decrypt = cast6_decrypt} + } +}; + +static int __init cast6_mod_init(void) +{ + return crypto_register_alg(&alg); +} + +static void __exit cast6_mod_fini(void) +{ + crypto_unregister_alg(&alg); +} + +module_init(cast6_mod_init); +module_exit(cast6_mod_fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Cast6 Cipher Algorithm"); +MODULE_ALIAS_CRYPTO("cast6"); +MODULE_ALIAS_CRYPTO("cast6-generic"); -- cgit v1.3.1