/* * linux/net/sunrpc/gss_krb5_seqnum.c * * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c * * Copyright (c) 2000 The Regents of the University of Michigan. * All rights reserved. * * Andy Adamson */ /* * Copyright 1993 by OpenVision Technologies, Inc. * * Permission to use, copy, modify, distribute, and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appears in all copies and * that both that copyright notice and this permission notice appear in * supporting documentation, and that the name of OpenVision not be used * in advertising or publicity pertaining to distribution of the software * without specific, written prior permission. OpenVision makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) # define RPCDBG_FACILITY RPCDBG_AUTH #endif static s32 krb5_make_rc4_seq_num(struct krb5_ctx *kctx, int direction, s32 seqnum, unsigned char *cksum, unsigned char *buf) { struct crypto_skcipher *cipher; unsigned char plain[8]; s32 code; dprintk("RPC: %s:\n", __func__); cipher = crypto_alloc_skcipher(kctx->gk5e->encrypt_name, 0, CRYPTO_ALG_ASYNC); if (IS_ERR(cipher)) return PTR_ERR(cipher); plain[0] = (unsigned char) ((seqnum >> 24) & 0xff); plain[1] = (unsigned char) ((seqnum >> 16) & 0xff); plain[2] = (unsigned char) ((seqnum >> 8) & 0xff); plain[3] = (unsigned char) ((seqnum >> 0) & 0xff); plain[4] = direction; plain[5] = direction; plain[6] = direction; plain[7] = direction; code = krb5_rc4_setup_seq_key(kctx, cipher, cksum); if (code) goto out; code = krb5_encrypt(cipher, cksum, plain, buf, 8); out: crypto_free_skcipher(cipher); return code; } s32 krb5_make_seq_num(struct krb5_ctx *kctx, struct crypto_skcipher *key, int direction, u32 seqnum, unsigned char *cksum, unsigned char *buf) { unsigned char plain[8]; if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC) return krb5_make_rc4_seq_num(kctx, direction, seqnum, cksum, buf); plain[0] = (unsigned char) (seqnum & 0xff); plain[1] = (unsigned char) ((seqnum >> 8) & 0xff); plain[2] = (unsigned char) ((seqnum >> 16) & 0xff); plain[3] = (unsigned char) ((seqnum >> 24) & 0xff); plain[4] = direction; plain[5] = direction; plain[6] = direction; plain[7] = direction; return krb5_encrypt(key, cksum, plain, buf, 8); } static s32 krb5_get_rc4_seq_num(struct krb5_ctx *kctx, unsigned char *cksum, unsigned char *buf, int *direction, s32 *seqnum) { struct crypto_skcipher *cipher; unsigned char plain[8]; s32 code; dprintk("RPC: %s:\n", __func__); cipher = crypto_alloc_skcipher(kctx->gk5e->encrypt_name, 0, CRYPTO_ALG_ASYNC); if (IS_ERR(cipher)) return PTR_ERR(cipher); code = krb5_rc4_setup_seq_key(kctx, cipher, cksum); if (code) goto out; code = krb5_decrypt(cipher, cksum, buf, plain, 8); if (code) goto out; if ((plain[4] != plain[5]) || (plain[4] != plain[6]) || (plain[4] != plain[7])) { code = (s32)KG_BAD_SEQ; goto out; } *direction = plain[4]; *seqnum = ((plain[0] << 24) | (plain[1] << 16) | (plain[2] << 8) | (plain[3])); out: crypto_free_skcipher(cipher); return code; } s32 krb5_get_seq_num(struct krb5_ctx *kctx, unsigned char *cksum, unsigned char *buf, int *direction, u32 *seqnum) { s32 code; unsigned char plain[8]; struct crypto_skcipher *key = kctx->seq; dprintk("RPC: krb5_get_seq_num:\n"); if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC) return krb5_get_rc4_seq_num(kctx, cksum, buf, direction, seqnum); if ((code = krb5_decrypt(key, cksum, buf, plain, 8))) return code; if ((plain[4] != plain[5]) || (plain[4] != plain[6]) || (plain[4] != plain[7])) return (s32)KG_BAD_SEQ; *direction = plain[4]; *seqnum = ((plain[0]) | (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24)); return 0; } n value='2'>stat only
authorJiri Olsa <jolsa@kernel.org>2016-12-28 14:31:03 +0100
committerIngo Molnar <mingo@kernel.org>2017-01-14 11:06:49 +0100
commit475113d937adfd150eb82b5e2c5507125a68e7af (patch)
tree8c5b0c58d3308738b440e5e1ec8e479ecf6ac11e /sound/usb/line6
parent321027c1fe77f892f4ea07846aeae08cefbbb290 (diff)
perf/x86/intel: Account interrupts for PEBS errors
It's possible to set up PEBS events to get only errors and not any data, like on SNB-X (model 45) and IVB-EP (model 62) via 2 perf commands running simultaneously: taskset -c 1 ./perf record -c 4 -e branches:pp -j any -C 10 This leads to a soft lock up, because the error path of the intel_pmu_drain_pebs_nhm() does not account event->hw.interrupt for error PEBS interrupts, so in case you're getting ONLY errors you don't have a way to stop the event when it's over the max_samples_per_tick limit: NMI watchdog: BUG: soft lockup - CPU#22 stuck for 22s! [perf_fuzzer:5816] ... RIP: 0010:[<ffffffff81159232>] [<ffffffff81159232>] smp_call_function_single+0xe2/0x140 ... Call Trace: ? trace_hardirqs_on_caller+0xf5/0x1b0 ? perf_cgroup_attach+0x70/0x70 perf_install_in_context+0x199/0x1b0 ? ctx_resched+0x90/0x90 SYSC_perf_event_open+0x641/0xf90 SyS_perf_event_open+0x9/0x10 do_syscall_64+0x6c/0x1f0 entry_SYSCALL64_slow_path+0x25/0x25 Add perf_event_account_interrupt() which does the interrupt and frequency checks and call it from intel_pmu_drain_pebs_nhm()'s error path. We keep the pending_kill and pending_wakeup logic only in the __perf_event_overflow() path, because they make sense only if there's any data to deliver. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vince@deater.net> Cc: Vince Weaver <vincent.weaver@maine.edu> Link: http://lkml.kernel.org/r/1482931866-6018-2-git-send-email-jolsa@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/usb/line6')