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 --- net/rxrpc/tests/Makefile | 3 + net/rxrpc/tests/rxrpc_kunit.c | 140 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 143 insertions(+) create mode 100644 net/rxrpc/tests/Makefile create mode 100644 net/rxrpc/tests/rxrpc_kunit.c (limited to 'net/rxrpc/tests') diff --git a/net/rxrpc/tests/Makefile b/net/rxrpc/tests/Makefile new file mode 100644 index 000000000..4f5100880 --- /dev/null +++ b/net/rxrpc/tests/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_AF_RXRPC_KUNIT_TEST) += rxrpc_kunit.o diff --git a/net/rxrpc/tests/rxrpc_kunit.c b/net/rxrpc/tests/rxrpc_kunit.c new file mode 100644 index 000000000..95fd05a07 --- /dev/null +++ b/net/rxrpc/tests/rxrpc_kunit.c @@ -0,0 +1,140 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Unit tests for RxRPC crypto functions + * + * Copyright 2026 Google LLC + */ +#include "../ar-internal.h" +#include +#include + +struct fcrypt_pcbc_testvec { + u8 key[FCRYPT_BSIZE]; + u8 iv[FCRYPT_BSIZE]; + const u8 *ptext; /* plaintext */ + const u8 *ctext; /* ciphertext */ + size_t nblocks; /* length of ptext and ctext in blocks */ +}; + +/* FCrypt-PCBC test vectors */ +static const struct fcrypt_pcbc_testvec fcrypt_pcbc_testvecs[] = { + { + /* http://www.openafs.org/pipermail/openafs-devel/2000-December/005320.html */ + .key = "\x00\x00\x00\x00\x00\x00\x00\x00", + .iv = "\x00\x00\x00\x00\x00\x00\x00\x00", + .ptext = "\x00\x00\x00\x00\x00\x00\x00\x00", + .ctext = "\x0E\x09\x00\xC7\x3E\xF7\xED\x41", + .nblocks = 1, + }, + { + .key = "\x11\x44\x77\xAA\xDD\x00\x33\x66", + .iv = "\x00\x00\x00\x00\x00\x00\x00\x00", + .ptext = "\x12\x34\x56\x78\x9A\xBC\xDE\xF0", + .ctext = "\xD8\xED\x78\x74\x77\xEC\x06\x80", + .nblocks = 1, + }, + { + /* From Arla */ + .key = "\xf0\xe1\xd2\xc3\xb4\xa5\x96\x87", + .iv = "\xfe\xdc\xba\x98\x76\x54\x32\x10", + .ptext = "The quick brown fox jumps over the lazy dogs.\0\0", + .ctext = "\x00\xf0\x0e\x11\x75\xe6\x23\x82" + "\xee\xac\x98\x62\x44\x51\xe4\x84" + "\xc3\x59\xd8\xaa\x64\x60\xae\xf7" + "\xd2\xd9\x13\x79\x72\xa3\x45\x03" + "\x23\xb5\x62\xd7\x0c\xf5\x27\xd1" + "\xf8\x91\x3c\xac\x44\x22\x92\xef", + .nblocks = 6, + }, + { + .key = "\xfe\xdc\xba\x98\x76\x54\x32\x10", + .iv = "\xf0\xe1\xd2\xc3\xb4\xa5\x96\x87", + .ptext = "The quick brown fox jumps over the lazy dogs.\0\0", + .ctext = "\xca\x90\xf5\x9d\xcb\xd4\xd2\x3c" + "\x01\x88\x7f\x3e\x31\x6e\x62\x9d" + "\xd8\xe0\x57\xa3\x06\x3a\x42\x58" + "\x2a\x28\xfe\x72\x52\x2f\xdd\xe0" + "\x19\x89\x09\x1c\x2a\x8e\x8c\x94" + "\xfc\xc7\x68\xe4\x88\xaa\xde\x0f", + .nblocks = 6, + } +}; + +static void test_fcrypt_pcbc(struct kunit *test) +{ + u8 data[48]; + + for (size_t i = 0; i < ARRAY_SIZE(fcrypt_pcbc_testvecs); i++) { + const struct fcrypt_pcbc_testvec *tv = &fcrypt_pcbc_testvecs[i]; + const size_t nblocks = tv->nblocks; + const size_t len = nblocks * FCRYPT_BSIZE; + struct fcrypt_key key; + + KUNIT_ASSERT_GE(test, sizeof(data), len); + + fcrypt_preparekey(&key, tv->key); + + /* out-of-place encryption */ + fcrypt_pcbc_encrypt(&key, tv->iv, tv->ptext, data, nblocks); + KUNIT_ASSERT_MEMEQ(test, tv->ctext, data, len); + + /* in-place encryption */ + memcpy(data, tv->ptext, len); + fcrypt_pcbc_encrypt(&key, tv->iv, data, data, nblocks); + KUNIT_ASSERT_MEMEQ(test, tv->ctext, data, len); + + /* out-of-place decryption */ + fcrypt_pcbc_decrypt(&key, tv->iv, tv->ctext, data, nblocks); + KUNIT_ASSERT_MEMEQ(test, tv->ptext, data, len); + + /* in-place decryption */ + memcpy(data, tv->ctext, len); + fcrypt_pcbc_decrypt(&key, tv->iv, data, data, nblocks); + KUNIT_ASSERT_MEMEQ(test, tv->ptext, data, len); + } +} + +static void test_des_pcbc(struct kunit *test) +{ + /* This was generated from the original pcbc(des) crypto API code. */ + static const u8 expected_ptext[24] = + "\xc8\xe2\x3c\xdf\x80\x61\x8a\xad\xa5\x52\xb4\x20" + "\x74\x32\x1f\xe4\x2c\x15\x7d\x21\x57\xda\x3f\x31"; + u8 key[8]; + union { + __le64 w; + u8 b[8]; + } iv; + u8 data[24]; + struct des_ctx ctx; + int err; + + for (int i = 0; i < 8; i++) { + key[i] = i; + iv.b[i] = 255 - i; + } + for (int i = 0; i < sizeof(data); i++) + data[i] = i; + + err = des_expand_key(&ctx, key, sizeof(key)); + KUNIT_ASSERT_EQ(test, 0, err); + + des_pcbc_decrypt_inplace(&ctx, iv.w, data, sizeof(data)); + KUNIT_ASSERT_MEMEQ(test, expected_ptext, data, sizeof(data)); +} + +static struct kunit_case rxrpc_test_cases[] = { + KUNIT_CASE(test_fcrypt_pcbc), + KUNIT_CASE(test_des_pcbc), + {}, +}; + +static struct kunit_suite rxrpc_test_suite = { + .name = "rxrpc", + .test_cases = rxrpc_test_cases, +}; +kunit_test_suite(rxrpc_test_suite); + +MODULE_DESCRIPTION("Unit tests for RxRPC crypto functions"); +MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1