1/* 2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org> 3 * Copyright (c) 2015-2017 The strace developers. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "defs.h" 30#include "print_fields.h" 31#include "xlat/kcmp_types.h" 32 33struct strace_kcmp_epoll_slot { 34 uint32_t efd; 35 uint32_t tfd; 36 uint32_t toff; 37}; 38 39static void 40printpidfd(struct tcb *tcp, pid_t pid, int fd) 41{ 42 /* 43 * XXX We want to use printfd here, but we should figure out which 44 * process in strace's PID NS is referred to first. 45 */ 46 tprintf("%d", fd); 47} 48 49#define PRINT_FIELD_PIDFD(prefix_, where_, field_, tcp_, pid_) \ 50 do { \ 51 STRACE_PRINTF("%s%s=", (prefix_), #field_); \ 52 printpidfd((tcp_), (pid_), (where_).field_); \ 53 } while (0) 54 55SYS_FUNC(kcmp) 56{ 57 pid_t pid1 = tcp->u_arg[0]; 58 pid_t pid2 = tcp->u_arg[1]; 59 int type = tcp->u_arg[2]; 60 kernel_ulong_t idx1 = tcp->u_arg[3]; 61 kernel_ulong_t idx2 = tcp->u_arg[4]; 62 63 tprintf("%d, %d, ", pid1, pid2); 64 printxval(kcmp_types, type, "KCMP_???"); 65 66 switch (type) { 67 case KCMP_FILE: 68 tprints(", "); 69 printpidfd(tcp, pid1, idx1); 70 tprints(", "); 71 printpidfd(tcp, pid1, idx2); 72 73 break; 74 75 case KCMP_EPOLL_TFD: { 76 struct strace_kcmp_epoll_slot slot; 77 78 tprints(", "); 79 printpidfd(tcp, pid1, idx1); 80 tprints(", "); 81 82 if (umove_or_printaddr(tcp, idx2, &slot)) 83 break; 84 85 PRINT_FIELD_PIDFD("{", slot, efd, tcp, pid2); 86 PRINT_FIELD_PIDFD(", ", slot, tfd, tcp, pid2); 87 PRINT_FIELD_U(", ", slot, toff); 88 tprints("}"); 89 90 break; 91 } 92 93 case KCMP_FILES: 94 case KCMP_FS: 95 case KCMP_IO: 96 case KCMP_SIGHAND: 97 case KCMP_SYSVSEM: 98 case KCMP_VM: 99 break; 100 default: 101 tprintf(", %#" PRI_klx ", %#" PRI_klx, idx1, idx2); 102 } 103 104 return RVAL_DECODED; 105} 106