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
33 struct strace_kcmp_epoll_slot {
34 uint32_t efd;
35 uint32_t tfd;
36 uint32_t toff;
37 };
38
39 static void
printpidfd(struct tcb * tcp,pid_t pid,int fd)40 printpidfd(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
SYS_FUNC(kcmp)55 SYS_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