1 /*
2 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2014-2018 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
31 #include "xlat/kexec_load_flags.h"
32 #include "xlat/kexec_arch_values.h"
33
34 #ifndef KEXEC_ARCH_MASK
35 # define KEXEC_ARCH_MASK 0xffff0000
36 #endif
37 #ifndef KEXEC_SEGMENT_MAX
38 # define KEXEC_SEGMENT_MAX 16
39 #endif
40
41 static bool
print_seg(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)42 print_seg(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
43 {
44 const kernel_ulong_t *seg;
45 kernel_ulong_t seg_buf[4];
46
47 if (elem_size < sizeof(seg_buf)) {
48 unsigned int i;
49
50 for (i = 0; i < ARRAY_SIZE(seg_buf); ++i)
51 seg_buf[i] = ((unsigned int *) elem_buf)[i];
52 seg = seg_buf;
53 } else {
54 seg = elem_buf;
55 }
56
57 tprints("{buf=");
58 printaddr(seg[0]);
59 tprintf(", bufsz=%" PRI_klu ", mem=", seg[1]);
60 printaddr(seg[2]);
61 tprintf(", memsz=%" PRI_klu "}", seg[3]);
62
63 return true;
64 }
65
66 static void
print_kexec_segments(struct tcb * const tcp,const kernel_ulong_t addr,const kernel_ulong_t len)67 print_kexec_segments(struct tcb *const tcp, const kernel_ulong_t addr,
68 const kernel_ulong_t len)
69 {
70 if (len > KEXEC_SEGMENT_MAX) {
71 printaddr(addr);
72 return;
73 }
74
75 kernel_ulong_t seg[4];
76 const size_t sizeof_seg = ARRAY_SIZE(seg) * current_wordsize;
77
78 print_array(tcp, addr, len, seg, sizeof_seg,
79 tfetch_mem, print_seg, 0);
80 }
81
SYS_FUNC(kexec_load)82 SYS_FUNC(kexec_load)
83 {
84 /* entry, nr_segments */
85 printaddr(tcp->u_arg[0]);
86 tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
87
88 /* segments */
89 print_kexec_segments(tcp, tcp->u_arg[2], tcp->u_arg[1]);
90 tprints(", ");
91
92 /* flags */
93 kernel_ulong_t n = tcp->u_arg[3];
94 printxval64(kexec_arch_values, n & KEXEC_ARCH_MASK, "KEXEC_ARCH_???");
95 n &= ~(kernel_ulong_t) KEXEC_ARCH_MASK;
96 if (n) {
97 tprints("|");
98 printflags64(kexec_load_flags, n, "KEXEC_???");
99 }
100
101 return RVAL_DECODED;
102 }
103
104 #include "xlat/kexec_file_load_flags.h"
105
SYS_FUNC(kexec_file_load)106 SYS_FUNC(kexec_file_load)
107 {
108 /* kernel_fd */
109 printfd(tcp, tcp->u_arg[0]);
110 tprints(", ");
111 /* initrd_fd */
112 printfd(tcp, tcp->u_arg[1]);
113 tprints(", ");
114 /* cmdline_len */
115 tprintf("%" PRI_klu ", ", tcp->u_arg[2]);
116 /* cmdline */
117 printstrn(tcp, tcp->u_arg[3], tcp->u_arg[2]);
118 tprints(", ");
119 /* flags */
120 printflags64(kexec_file_load_flags, tcp->u_arg[4], "KEXEC_FILE_???");
121
122 return RVAL_DECODED;
123 }
124