1 | /* $NetBSD: linux32_exec_elf32.c,v 1.19 2016/08/06 15:13:13 maxv Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1995, 1998, 2000, 2001,2006 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and |
9 | * Emmanuel Dreyfus. |
10 | * |
11 | * Redistribution and use in source and binary forms, with or without |
12 | * modification, are permitted provided that the following conditions |
13 | * are met: |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions and the following disclaimer. |
16 | * 2. Redistributions in binary form must reproduce the above copyright |
17 | * notice, this list of conditions and the following disclaimer in the |
18 | * documentation and/or other materials provided with the distribution. |
19 | * |
20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
30 | * POSSIBILITY OF SUCH DAMAGE. |
31 | */ |
32 | |
33 | #include <sys/cdefs.h> |
34 | __KERNEL_RCSID(0, "$NetBSD: linux32_exec_elf32.c,v 1.19 2016/08/06 15:13:13 maxv Exp $" ); |
35 | |
36 | #define ELFSIZE 32 |
37 | |
38 | #include <sys/param.h> |
39 | #include <sys/systm.h> |
40 | #include <sys/proc.h> |
41 | #include <sys/vnode.h> |
42 | #include <sys/exec.h> |
43 | #include <sys/exec_elf.h> |
44 | #include <sys/kauth.h> |
45 | #include <sys/kernel.h> |
46 | #include <sys/resourcevar.h> |
47 | #include <sys/signal.h> |
48 | #include <sys/signalvar.h> |
49 | #include <sys/cprng.h> |
50 | |
51 | #include <compat/linux/common/linux_exec.h> |
52 | #include <compat/netbsd32/netbsd32.h> |
53 | #include <compat/netbsd32/netbsd32_exec.h> |
54 | #include <compat/linux32/common/linux32_exec.h> |
55 | |
56 | #include <machine/cpuvar.h> |
57 | #include <machine/frame.h> |
58 | |
59 | #ifdef DEBUG_LINUX |
60 | #define DPRINTF(a) uprintf a |
61 | #else |
62 | #define DPRINTF(a) |
63 | #endif |
64 | |
65 | int linux32_copyinargs(struct exec_package *, struct ps_strings *, |
66 | void *, size_t, const void *, const void *); |
67 | |
68 | int |
69 | ELFNAME2(linux32,probe)(struct lwp *l, struct exec_package *epp, |
70 | void *eh, char *itp, vaddr_t *pos) |
71 | { |
72 | int error; |
73 | |
74 | if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && |
75 | #ifdef LINUX32_GCC_SIGNATURE |
76 | ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && |
77 | #endif |
78 | #ifdef LINUX32_ATEXIT_SIGNATURE |
79 | ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && |
80 | #endif |
81 | #ifdef LINUX32_DEBUGLINK_SIGNATURE |
82 | ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && |
83 | #endif |
84 | 1) |
85 | return error; |
86 | |
87 | if (itp) { |
88 | if ((error = emul_find_interp(l, epp, itp))) |
89 | return (error); |
90 | } |
91 | #if 0 |
92 | DPRINTF(("linux32_probe: returning 0\n" )); |
93 | #endif |
94 | |
95 | epp->ep_flags |= EXEC_32 | EXEC_FORCEAUX; |
96 | epp->ep_vm_minaddr = exec_vm_minaddr(VM_MIN_ADDRESS); |
97 | epp->ep_vm_maxaddr = USRSTACK32; |
98 | |
99 | return 0; |
100 | } |
101 | |
102 | /* |
103 | * Copy arguments onto the stack in the normal way, but add some |
104 | * extra information in case of dynamic binding. |
105 | */ |
106 | int |
107 | linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, |
108 | struct ps_strings *arginfo, char **stackp, void *argp) |
109 | { |
110 | Aux32Info ai[LINUX32_ELF_AUX_ENTRIES], *a; |
111 | uint32_t randbytes[4]; |
112 | struct elf_args *ap; |
113 | struct vattr *vap; |
114 | size_t len; |
115 | int error; |
116 | |
117 | if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) |
118 | return error; |
119 | |
120 | a = ai; |
121 | |
122 | memset(ai, 0, sizeof(ai)); |
123 | |
124 | /* |
125 | * Push extra arguments on the stack needed by dynamically |
126 | * linked binaries and static binaries as well. |
127 | */ |
128 | |
129 | a->a_type = AT_PAGESZ; |
130 | a->a_v = PAGE_SIZE; |
131 | a++; |
132 | |
133 | if ((ap = (struct elf_args *)pack->ep_emul_arg)) { |
134 | |
135 | a->a_type = AT_PHDR; |
136 | a->a_v = ap->arg_phaddr; |
137 | a++; |
138 | |
139 | a->a_type = AT_PHENT; |
140 | a->a_v = ap->arg_phentsize; |
141 | a++; |
142 | |
143 | a->a_type = AT_PHNUM; |
144 | a->a_v = ap->arg_phnum; |
145 | a++; |
146 | |
147 | a->a_type = AT_BASE; |
148 | a->a_v = ap->arg_interp; |
149 | a++; |
150 | |
151 | a->a_type = AT_FLAGS; |
152 | a->a_v = 0; |
153 | a++; |
154 | |
155 | a->a_type = AT_ENTRY; |
156 | a->a_v = ap->arg_entry; |
157 | a++; |
158 | |
159 | exec_free_emul_arg(pack); |
160 | } |
161 | |
162 | /* Linux-specific items */ |
163 | a->a_type = LINUX_AT_CLKTCK; |
164 | a->a_v = hz; |
165 | a++; |
166 | |
167 | vap = pack->ep_vap; |
168 | |
169 | a->a_type = LINUX_AT_UID; |
170 | a->a_v = kauth_cred_getuid(l->l_cred); |
171 | a++; |
172 | |
173 | a->a_type = LINUX_AT_EUID; |
174 | a->a_v = ((vap->va_mode & S_ISUID) ? |
175 | vap->va_uid : kauth_cred_geteuid(l->l_cred)); |
176 | a++; |
177 | |
178 | a->a_type = LINUX_AT_GID; |
179 | a->a_v = kauth_cred_getgid(l->l_cred); |
180 | a++; |
181 | |
182 | a->a_type = LINUX_AT_EGID; |
183 | a->a_v = ((vap->va_mode & S_ISGID) ? |
184 | vap->va_gid : kauth_cred_getegid(l->l_cred)); |
185 | a++; |
186 | |
187 | a->a_type = LINUX_AT_SECURE; |
188 | a->a_v = 0; |
189 | a++; |
190 | |
191 | a->a_type = LINUX_AT_RANDOM; |
192 | a->a_v = NETBSD32PTR32I(*stackp); |
193 | a++; |
194 | |
195 | #if 0 |
196 | /* XXX: increase LINUX32_ELF_AUX_ENTRIES if we enable those things */ |
197 | |
198 | a->a_type = LINUX_AT_SYSINFO; |
199 | a->a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); |
200 | a++; |
201 | |
202 | a->a_type = LINUX_AT_SYSINFO_EHDR; |
203 | a->a_v = NETBSD32PTR32I(&esdp->elfhdr); |
204 | a++; |
205 | |
206 | a->a_type = LINUX_AT_HWCAP; |
207 | a->a_v = LINUX32_CPUCAP; |
208 | a++; |
209 | |
210 | a->a_type = LINUX_AT_PLATFORM; |
211 | a->a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); |
212 | a++; |
213 | #endif |
214 | |
215 | a->a_type = AT_NULL; |
216 | a->a_v = 0; |
217 | a++; |
218 | |
219 | randbytes[0] = cprng_strong32(); |
220 | randbytes[1] = cprng_strong32(); |
221 | randbytes[2] = cprng_strong32(); |
222 | randbytes[3] = cprng_strong32(); |
223 | |
224 | len = sizeof(randbytes); |
225 | if ((error = copyout(randbytes, *stackp, len)) != 0) |
226 | return error; |
227 | *stackp += len; |
228 | |
229 | #if 0 |
230 | memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, |
231 | sizeof(linux32_kernel_vsyscall)); |
232 | |
233 | memcpy(&esd.elfhdr, eh, sizeof(*eh)); |
234 | |
235 | strcpy(esd.hw_platform, LINUX32_PLATFORM); |
236 | |
237 | /* |
238 | * Copy out the ELF auxiliary table and hw platform name |
239 | */ |
240 | if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) |
241 | return error; |
242 | *stackp += sizeof(esd); |
243 | #endif |
244 | |
245 | len = (a - ai) * sizeof(Aux32Info); |
246 | KASSERT(len <= LINUX32_ELF_AUX_ENTRIES * sizeof(Aux32Info)); |
247 | if ((error = copyout(ai, *stackp, len)) != 0) |
248 | return error; |
249 | *stackp += len; |
250 | |
251 | return 0; |
252 | } |
253 | |