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1 /*
2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6  * Copyright (c) 1999-2017 The strace developers.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. The name of the author may not be used to endorse or promote products
18  *    derived from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include "defs.h"
33 #include "print_fields.h"
34 #include <linux/aio_abi.h>
35 
SYS_FUNC(io_setup)36 SYS_FUNC(io_setup)
37 {
38 	if (entering(tcp))
39 		tprintf("%u, ", (unsigned int) tcp->u_arg[0]);
40 	else
41 		printnum_ptr(tcp, tcp->u_arg[1]);
42 	return 0;
43 }
44 
SYS_FUNC(io_destroy)45 SYS_FUNC(io_destroy)
46 {
47 	printaddr(tcp->u_arg[0]);
48 
49 	return RVAL_DECODED;
50 }
51 
52 enum iocb_sub {
53 	SUB_NONE, SUB_COMMON, SUB_VECTOR
54 };
55 
56 static enum iocb_sub
tprint_lio_opcode(unsigned int cmd)57 tprint_lio_opcode(unsigned int cmd)
58 {
59 	static const struct {
60 		const char *name;
61 		enum iocb_sub sub;
62 	} cmds[] = {
63 		{ "IOCB_CMD_PREAD", SUB_COMMON },
64 		{ "IOCB_CMD_PWRITE", SUB_COMMON },
65 		{ "IOCB_CMD_FSYNC", SUB_NONE },
66 		{ "IOCB_CMD_FDSYNC", SUB_NONE },
67 		{ "IOCB_CMD_PREADX", SUB_NONE },
68 		{ "IOCB_CMD_POLL", SUB_NONE },
69 		{ "IOCB_CMD_NOOP", SUB_NONE },
70 		{ "IOCB_CMD_PREADV", SUB_VECTOR },
71 		{ "IOCB_CMD_PWRITEV", SUB_VECTOR },
72 	};
73 
74 	if (cmd < ARRAY_SIZE(cmds)) {
75 		tprints(cmds[cmd].name);
76 		return cmds[cmd].sub;
77 	}
78 	tprintf("%u", cmd);
79 	tprints_comment("IOCB_CMD_???");
80 	return SUB_NONE;
81 }
82 
83 static void
print_common_flags(struct tcb * tcp,const struct iocb * cb)84 print_common_flags(struct tcb *tcp, const struct iocb *cb)
85 {
86 /* IOCB_FLAG_RESFD is available since v2.6.22-rc1~47 */
87 #ifdef IOCB_FLAG_RESFD
88 	if (cb->aio_flags & IOCB_FLAG_RESFD)
89 		PRINT_FIELD_FD(", ", *cb, aio_resfd, tcp);
90 
91 	if (cb->aio_flags & ~IOCB_FLAG_RESFD)
92 		PRINT_FIELD_X(", ", *cb, aio_flags);
93 #endif
94 }
95 
96 static bool
iocb_is_valid(const struct iocb * cb)97 iocb_is_valid(const struct iocb *cb)
98 {
99 	return cb->aio_buf == (unsigned long) cb->aio_buf &&
100 	       cb->aio_nbytes == (size_t) cb->aio_nbytes &&
101 	       (ssize_t) cb->aio_nbytes >= 0;
102 }
103 
104 static enum iocb_sub
print_iocb_header(struct tcb * tcp,const struct iocb * cb)105 print_iocb_header(struct tcb *tcp, const struct iocb *cb)
106 {
107 	enum iocb_sub sub;
108 
109 	if (cb->aio_data){
110 		PRINT_FIELD_X("", *cb, aio_data);
111 		tprints(", ");
112 	}
113 
114 	if (cb->aio_key) {
115 		PRINT_FIELD_U("", *cb, aio_key);
116 		tprints(", ");
117 	}
118 
119 	tprints("aio_lio_opcode=");
120 	sub = tprint_lio_opcode(cb->aio_lio_opcode);
121 	if (cb->aio_reqprio)
122 		PRINT_FIELD_D(", ", *cb, aio_reqprio);
123 
124 	PRINT_FIELD_FD(", ", *cb, aio_fildes, tcp);
125 
126 	return sub;
127 }
128 
129 static void
print_iocb(struct tcb * tcp,const struct iocb * cb)130 print_iocb(struct tcb *tcp, const struct iocb *cb)
131 {
132 	enum iocb_sub sub = print_iocb_header(tcp, cb);
133 
134 	switch (sub) {
135 	case SUB_COMMON:
136 		if (cb->aio_lio_opcode == 1 && iocb_is_valid(cb)) {
137 			PRINT_FIELD_STRN(", ", *cb, aio_buf,
138 					 cb->aio_nbytes, tcp);
139 		} else {
140 			PRINT_FIELD_X(", ", *cb, aio_buf);
141 		}
142 		PRINT_FIELD_U(", ", *cb, aio_nbytes);
143 		PRINT_FIELD_D(", ", *cb, aio_offset);
144 		print_common_flags(tcp, cb);
145 		break;
146 	case SUB_VECTOR:
147 		if (iocb_is_valid(cb)) {
148 			tprints(", aio_buf=");
149 			tprint_iov(tcp, cb->aio_nbytes, cb->aio_buf,
150 				   cb->aio_lio_opcode == 8
151 				   ? IOV_DECODE_STR
152 				   : IOV_DECODE_ADDR);
153 		} else {
154 			PRINT_FIELD_X(", ", *cb, aio_buf);
155 			PRINT_FIELD_U(", ", *cb, aio_nbytes);
156 		}
157 		PRINT_FIELD_D(", ", *cb, aio_offset);
158 		print_common_flags(tcp, cb);
159 		break;
160 	case SUB_NONE:
161 		break;
162 	}
163 }
164 
165 static bool
print_iocbp(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)166 print_iocbp(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
167 {
168 	kernel_ulong_t addr;
169 	struct iocb cb;
170 
171 	if (elem_size < sizeof(kernel_ulong_t)) {
172 		addr = *(unsigned int *) elem_buf;
173 	} else {
174 		addr = *(kernel_ulong_t *) elem_buf;
175 	}
176 
177 	tprints("{");
178 	if (!umove_or_printaddr(tcp, addr, &cb))
179 		print_iocb(tcp, &cb);
180 	tprints("}");
181 
182 	return true;
183 }
184 
SYS_FUNC(io_submit)185 SYS_FUNC(io_submit)
186 {
187 	const kernel_long_t nr =
188 		truncate_klong_to_current_wordsize(tcp->u_arg[1]);
189 	const kernel_ulong_t addr = tcp->u_arg[2];
190 	kernel_ulong_t iocbp;
191 
192 	printaddr(tcp->u_arg[0]);
193 	tprintf(", %" PRI_kld ", ", nr);
194 
195 	if (nr < 0)
196 		printaddr(addr);
197 	else
198 		print_array(tcp, addr, nr, &iocbp, current_wordsize,
199 			    umoven_or_printaddr, print_iocbp, 0);
200 
201 	return RVAL_DECODED;
202 }
203 
204 static bool
print_io_event(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)205 print_io_event(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
206 {
207 	struct io_event *event = elem_buf;
208 
209 	PRINT_FIELD_X("{", *event, data);
210 	PRINT_FIELD_X(", ", *event, obj);
211 	PRINT_FIELD_D(", ", *event, res);
212 	PRINT_FIELD_D(", ", *event, res2);
213 	tprints("}");
214 
215 	return true;
216 }
217 
SYS_FUNC(io_cancel)218 SYS_FUNC(io_cancel)
219 {
220 	if (entering(tcp)) {
221 		printaddr(tcp->u_arg[0]);
222 		tprints(", ");
223 
224 		struct iocb cb;
225 
226 		if (!umove_or_printaddr(tcp, tcp->u_arg[1], &cb)) {
227 			tprints("{");
228 			print_iocb_header(tcp, &cb);
229 			tprints("}");
230 		}
231 		tprints(", ");
232 	} else {
233 		struct io_event event;
234 
235 		if (!umove_or_printaddr(tcp, tcp->u_arg[2], &event))
236 			print_io_event(tcp, &event, sizeof(event), 0);
237 	}
238 	return 0;
239 }
240 
SYS_FUNC(io_getevents)241 SYS_FUNC(io_getevents)
242 {
243 	if (entering(tcp)) {
244 		printaddr(tcp->u_arg[0]);
245 		tprintf(", %" PRI_kld ", %" PRI_kld ", ",
246 			truncate_klong_to_current_wordsize(tcp->u_arg[1]),
247 			truncate_klong_to_current_wordsize(tcp->u_arg[2]));
248 	} else {
249 		struct io_event buf;
250 		print_array(tcp, tcp->u_arg[3], tcp->u_rval, &buf, sizeof(buf),
251 			    umoven_or_printaddr, print_io_event, 0);
252 		tprints(", ");
253 		/*
254 		 * Since the timeout parameter is read by the kernel
255 		 * on entering syscall, it has to be decoded the same way
256 		 * whether the syscall has failed or not.
257 		 */
258 		temporarily_clear_syserror(tcp);
259 		print_timespec(tcp, tcp->u_arg[4]);
260 		restore_cleared_syserror(tcp);
261 	}
262 	return 0;
263 }
264