/* * Mausezahn - A fast versatile traffic generator * Copyright (C) 2008-2010 Herbert Haas * * This program is free software; you can redistribute it and/or modify it under * the terms of the GNU General Public License version 2 as published by the * Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License along with * this program; if not, see http://www.gnu.org/licenses/gpl-2.0.html * */ #include "mz.h" #include "mops.h" // -- TOC: -- // // u_int16_t mops_sum16 (u_int16_t len, u_int8_t buff[]) // int mops_get_transport_sum (struct mops *mp) ////////////////////////////////////////////////////////////////////////////////// // // See also: // // RFC1071 - Computing the Internet checksum // ////////////////////////////////////////////////////////////////////////////////// // Generic 16-bit checksum code as required for IP and other headers. // The checksum is calculated over buff[] which is of length len. // // RETURN VALUE: The checksum! (Validated - correct!!!) // // Example: t16 = mops_sum16 (20, &mp->frame[fp]); // u_int16_t mops_sum16 (u_int16_t len, u_int8_t buff[]) { u_int16_t word16; u_int32_t sum=0; u_int16_t i; // make 16 bit words out of every two adjacent 8 bit words in the packet and add them up for (i=0; i>16) sum = (sum & 0xFFFF)+(sum >> 16); // one's complement the result sum = ~sum; return ((u_int16_t) sum); } // sets UDP or TCP checksum within mp[]->frame // TODO: copying the whole segment is ugly and slow; // make it more efficient and realize it in-place. // int mops_get_transport_sum(struct mops *mp) { u_int8_t buf[MAX_PAYLOAD_SIZE]; u_int16_t len; int udp_used; u_int16_t sum; udp_used = mp->use_UDP; // 0 or 1, 0 means TCP // IP Pseudoheader (12 Bytes) mops_hton4(&mp->ip_src, &buf[0]); mops_hton4(&mp->ip_dst, &buf[4]); buf[9]=0x00; // Copy segment if (udp_used) { buf[10]=0x11; // proto UDP (17 dec) len = mp->udp_len; mops_hton2(&len, &buf[11]); memcpy(&buf[13], &mp->frame[mp->begin_UDP], len); // reset checksum to zero buf[19] = 0x00; buf[20] = 0x00; sum = mops_sum16(len+12, buf); // insert checksum in UDP header (in frame) mops_hton2 (&sum, &mp->frame[(mp->begin_UDP)+7]); } else { buf[10]=0x06; // proto TCP len = mp->ip_len - mp->ip_IHL; mops_hton2((u_int16_t*)&len, &buf[11]); memcpy(&buf[13], &mp->frame[mp->begin_TCP], len); // reset checksum to zero buf[29] = 0x00; buf[30] = 0x00; sum = mops_sum16(len+12, buf); // insert checksum in TCP header (in frame) mops_hton2 (&sum, &mp->frame[(mp->begin_TCP)+17]); } return 0; } er?h=nds-private-remove&id=a76a82a3e38c8d3fb6499e3dfaeb0949241ab588'>netfilter/xt_physdev.c
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authorPeter Zijlstra <peterz@infradead.org>2017-01-26 16:39:55 +0100
committerIngo Molnar <mingo@kernel.org>2017-01-30 11:41:25 +0100
commita76a82a3e38c8d3fb6499e3dfaeb0949241ab588 (patch)
treeb5bc906278fe1ac66d75de984d26bf59b43b3ed8 /net/netfilter/xt_physdev.c
parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
perf/core: Fix use-after-free bug
Dmitry reported a KASAN use-after-free on event->group_leader. It turns out there's a hole in perf_remove_from_context() due to event_function_call() not calling its function when the task associated with the event is already dead. In this case the event will have been detached from the task, but the grouping will have been retained, such that group operations might still work properly while there are live child events etc. This does however mean that we can miss a perf_group_detach() call when the group decomposes, this in turn can then lead to use-after-free. Fix it by explicitly doing the group detach if its still required. Reported-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Dmitry Vyukov <dvyukov@google.com> 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: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org # v4.5+ Cc: syzkaller <syzkaller@googlegroups.com> Fixes: 63b6da39bb38 ("perf: Fix perf_event_exit_task() race") Link: http://lkml.kernel.org/r/20170126153955.GD6515@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/netfilter/xt_physdev.c')