From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- crypto/arc4.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 crypto/arc4.c (limited to 'crypto/arc4.c') diff --git a/crypto/arc4.c b/crypto/arc4.c new file mode 100644 index 000000000..160801811 --- /dev/null +++ b/crypto/arc4.c @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cryptographic API + * + * ARC4 Cipher Algorithm + * + * Jon Oberheide + */ + +#include +#include +#include +#include +#include +#include + +#define ARC4_ALIGN __alignof__(struct arc4_ctx) + +static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key, + unsigned int key_len) +{ + struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm); + + return arc4_setkey(ctx, in_key, key_len); +} + +static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src, + u8 *dst, unsigned nbytes, u8 *siv, u32 flags) +{ + struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm); + + if (!(flags & CRYPTO_LSKCIPHER_FLAG_CONT)) + memcpy(siv, ctx, sizeof(*ctx)); + + ctx = (struct arc4_ctx *)siv; + + arc4_crypt(ctx, dst, src, nbytes); + return 0; +} + +static int crypto_arc4_init(struct crypto_lskcipher *tfm) +{ + pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n", + current->comm, (unsigned long)current->pid); + + return 0; +} + +static struct lskcipher_alg arc4_alg = { + .co.base.cra_name = "arc4", + .co.base.cra_driver_name = "arc4-generic", + .co.base.cra_priority = 100, + .co.base.cra_blocksize = ARC4_BLOCK_SIZE, + .co.base.cra_ctxsize = sizeof(struct arc4_ctx), + .co.base.cra_alignmask = ARC4_ALIGN - 1, + .co.base.cra_module = THIS_MODULE, + .co.min_keysize = ARC4_MIN_KEY_SIZE, + .co.max_keysize = ARC4_MAX_KEY_SIZE, + .co.statesize = sizeof(struct arc4_ctx), + .setkey = crypto_arc4_setkey, + .encrypt = crypto_arc4_crypt, + .decrypt = crypto_arc4_crypt, + .init = crypto_arc4_init, +}; + +static int __init arc4_init(void) +{ + return crypto_register_lskcipher(&arc4_alg); +} + +static void __exit arc4_exit(void) +{ + crypto_unregister_lskcipher(&arc4_alg); +} + +module_init(arc4_init); +module_exit(arc4_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ARC4 Cipher Algorithm"); +MODULE_AUTHOR("Jon Oberheide "); +MODULE_ALIAS_CRYPTO("ecb(arc4)"); -- cgit v1.3.1