Branch data Line data Source code
1 : : /*
2 : : * Copyright (c) 1999-2000 Wichert Akkerman <wichert@cistron.nl>
3 : : * Copyright (c) 2002-2005 Roland McGrath <roland@redhat.com>
4 : : * Copyright (c) 2008 Jan Kratochvil <jan.kratochvil@redhat.com>
5 : : * Copyright (c) 2009-2013 Denys Vlasenko <dvlasenk@redhat.com>
6 : : * Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org>
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 <sched.h>
34 : : #include <asm/unistd.h>
35 : :
36 : : #ifndef CSIGNAL
37 : : # define CSIGNAL 0x000000ff
38 : : #endif
39 : :
40 : : #include "xlat/clone_flags.h"
41 : : #include "xlat/setns_types.h"
42 : : #include "xlat/unshare_flags.h"
43 : :
44 : : #if defined IA64
45 : : # define ARG_FLAGS 0
46 : : # define ARG_STACK 1
47 : : # define ARG_STACKSIZE (tcp->scno == __NR_clone2 ? 2 : -1)
48 : : # define ARG_PTID (tcp->scno == __NR_clone2 ? 3 : 2)
49 : : # define ARG_CTID (tcp->scno == __NR_clone2 ? 4 : 3)
50 : : # define ARG_TLS (tcp->scno == __NR_clone2 ? 5 : 4)
51 : : #elif defined S390 || defined S390X || defined CRISV10 || defined CRISV32
52 : : # define ARG_STACK 0
53 : : # define ARG_FLAGS 1
54 : : # define ARG_PTID 2
55 : : # define ARG_CTID 3
56 : : # define ARG_TLS 4
57 : : #elif defined X86_64 || defined X32
58 : : /* x86 personality processes have the last two arguments flipped. */
59 : : # define ARG_FLAGS 0
60 : : # define ARG_STACK 1
61 : : # define ARG_PTID 2
62 : : # define ARG_CTID ((current_personality != 1) ? 3 : 4)
63 : : # define ARG_TLS ((current_personality != 1) ? 4 : 3)
64 : : #elif defined ALPHA || defined TILE || defined OR1K || defined RISCV
65 : : # define ARG_FLAGS 0
66 : : # define ARG_STACK 1
67 : : # define ARG_PTID 2
68 : : # define ARG_CTID 3
69 : : # define ARG_TLS 4
70 : : #else
71 : : # define ARG_FLAGS 0
72 : : # define ARG_STACK 1
73 : : # define ARG_PTID 2
74 : : # define ARG_TLS 3
75 : : # define ARG_CTID 4
76 : : #endif
77 : :
78 : : static void
79 : 0 : print_tls_arg(struct tcb *const tcp, const kernel_ulong_t addr)
80 : : {
81 : : #ifdef HAVE_STRUCT_USER_DESC
82 : : # if SUPPORTED_PERSONALITIES > 1
83 [ # # ]: 0 : if (current_personality == 1)
84 : : # endif
85 : : {
86 [ # # ]: 0 : print_user_desc(tcp, tcp->u_arg[ARG_TLS]);
87 : : }
88 : : # if SUPPORTED_PERSONALITIES > 1
89 : : else
90 : : # endif
91 : : #endif /* HAVE_STRUCT_USER_DESC */
92 : : {
93 [ # # ]: 0 : printaddr(tcp->u_arg[ARG_TLS]);
94 : : }
95 : 0 : }
96 : :
97 : 12 : SYS_FUNC(clone)
98 : : {
99 [ + + ]: 12 : if (exiting(tcp)) {
100 : 6 : const char *sep = "|";
101 : 6 : kernel_ulong_t flags = tcp->u_arg[ARG_FLAGS];
102 : 6 : tprints("child_stack=");
103 : 6 : printaddr(tcp->u_arg[ARG_STACK]);
104 : 6 : tprints(", ");
105 : : #ifdef ARG_STACKSIZE
106 : : if (ARG_STACKSIZE != -1)
107 : : tprintf("stack_size=%#" PRI_klx ", ",
108 : : tcp->u_arg[ARG_STACKSIZE]);
109 : : #endif
110 : 6 : tprints("flags=");
111 [ - + ]: 6 : if (!printflags64(clone_flags, flags &~ CSIGNAL, NULL))
112 : 0 : sep = "";
113 [ + - ]: 6 : if ((flags & CSIGNAL) != 0)
114 : 6 : tprintf("%s%s", sep, signame(flags & CSIGNAL));
115 [ - + ]: 6 : if ((flags & (CLONE_PARENT_SETTID|CLONE_CHILD_SETTID
116 : : |CLONE_CHILD_CLEARTID|CLONE_SETTLS)) == 0)
117 : 0 : return 0;
118 [ - + ]: 6 : if (flags & CLONE_PARENT_SETTID) {
119 : 0 : tprints(", parent_tidptr=");
120 : 0 : printaddr(tcp->u_arg[ARG_PTID]);
121 : : }
122 [ - + ]: 6 : if (flags & CLONE_SETTLS) {
123 : 0 : tprints(", tls=");
124 [ # # ]: 0 : print_tls_arg(tcp, tcp->u_arg[ARG_TLS]);
125 : : }
126 [ + - ]: 6 : if (flags & (CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID)) {
127 : 6 : tprints(", child_tidptr=");
128 [ + + ]: 6 : printaddr(tcp->u_arg[ARG_CTID]);
129 : : }
130 : : }
131 : : /* TODO on syscall entry:
132 : : * We can clear CLONE_PTRACE here since it is an ancient hack
133 : : * to allow us to catch children, and we use another hack for that.
134 : : * But CLONE_PTRACE can conceivably be used by malicious programs
135 : : * to subvert us. By clearing this bit, we can defend against it:
136 : : * in untraced execution, CLONE_PTRACE should have no effect.
137 : : *
138 : : * We can also clear CLONE_UNTRACED, since it allows to start
139 : : * children outside of our control. At the moment
140 : : * I'm trying to figure out whether there is a *legitimate*
141 : : * use of this flag which we should respect.
142 : : */
143 : 12 : return 0;
144 : : }
145 : :
146 : 18 : SYS_FUNC(setns)
147 : : {
148 : 18 : printfd(tcp, tcp->u_arg[0]);
149 : 18 : tprints(", ");
150 : 18 : printxval(setns_types, tcp->u_arg[1], "CLONE_NEW???");
151 : :
152 : 18 : return RVAL_DECODED;
153 : : }
154 : :
155 : 30 : SYS_FUNC(unshare)
156 : : {
157 : 30 : printflags64(unshare_flags, tcp->u_arg[0], "CLONE_???");
158 : 30 : return RVAL_DECODED;
159 : : }
160 : :
161 : 0 : SYS_FUNC(fork)
162 : : {
163 : 0 : return RVAL_DECODED | RVAL_UDECIMAL;
164 : : }
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