Commit | Line | Data |
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da7c5cc6 KM |
1 | /* |
2 | * Copyright (c) 1982 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
6 | * @(#)kern_prot.c 6.5 (Berkeley) %G% | |
7 | */ | |
a05af100 BJ |
8 | |
9 | /* | |
4147b3f6 | 10 | * System calls related to processes and protection |
a05af100 BJ |
11 | */ |
12 | ||
961945a8 SL |
13 | #include "../machine/reg.h" |
14 | ||
94368568 JB |
15 | #include "param.h" |
16 | #include "systm.h" | |
17 | #include "dir.h" | |
18 | #include "user.h" | |
19 | #include "inode.h" | |
20 | #include "proc.h" | |
21 | #include "timeb.h" | |
22 | #include "times.h" | |
23 | #include "reboot.h" | |
24 | #include "fs.h" | |
94368568 JB |
25 | #include "buf.h" |
26 | #include "mount.h" | |
27 | #include "quota.h" | |
a05af100 | 28 | |
4147b3f6 BJ |
29 | getpid() |
30 | { | |
31 | ||
32 | u.u_r.r_val1 = u.u_procp->p_pid; | |
33 | u.u_r.r_val2 = u.u_procp->p_ppid; | |
34 | } | |
35 | ||
36 | getpgrp() | |
37 | { | |
38 | register struct a { | |
39 | int pid; | |
40 | } *uap = (struct a *)u.u_ap; | |
41 | register struct proc *p; | |
42 | ||
43 | if (uap->pid == 0) | |
44 | uap->pid = u.u_procp->p_pid; | |
45 | p = pfind(uap->pid); | |
46 | if (p == 0) { | |
47 | u.u_error = ESRCH; | |
48 | return; | |
49 | } | |
50 | u.u_r.r_val1 = p->p_pgrp; | |
51 | } | |
52 | ||
a05af100 BJ |
53 | getuid() |
54 | { | |
55 | ||
56 | u.u_r.r_val1 = u.u_ruid; | |
57 | u.u_r.r_val2 = u.u_uid; | |
58 | } | |
59 | ||
4147b3f6 BJ |
60 | getgid() |
61 | { | |
62 | ||
63 | u.u_r.r_val1 = u.u_rgid; | |
64 | u.u_r.r_val2 = u.u_gid; | |
65 | } | |
66 | ||
197da11b | 67 | getgroups() |
4147b3f6 BJ |
68 | { |
69 | register struct a { | |
b32450f4 | 70 | u_int gidsetsize; |
4147b3f6 BJ |
71 | int *gidset; |
72 | } *uap = (struct a *)u.u_ap; | |
38b6104c MK |
73 | register gid_t *gp; |
74 | register int *lp; | |
75 | int groups[NGROUPS]; | |
4147b3f6 | 76 | |
197da11b | 77 | for (gp = &u.u_groups[NGROUPS]; gp > u.u_groups; gp--) |
38b6104c | 78 | if (gp[-1] != NOGROUP) |
197da11b BJ |
79 | break; |
80 | if (uap->gidsetsize < gp - u.u_groups) { | |
81 | u.u_error = EINVAL; | |
82 | return; | |
83 | } | |
84 | uap->gidsetsize = gp - u.u_groups; | |
38b6104c MK |
85 | for (lp = groups, gp = u.u_groups; lp < &groups[uap->gidsetsize]; ) |
86 | *lp++ = *gp++; | |
87 | u.u_error = copyout((caddr_t)groups, (caddr_t)uap->gidset, | |
88 | uap->gidsetsize * sizeof (groups[0])); | |
127f7d76 | 89 | if (u.u_error) |
4147b3f6 | 90 | return; |
197da11b | 91 | u.u_r.r_val1 = uap->gidsetsize; |
4147b3f6 BJ |
92 | } |
93 | ||
94 | setpgrp() | |
95 | { | |
96 | register struct proc *p; | |
97 | register struct a { | |
98 | int pid; | |
99 | int pgrp; | |
100 | } *uap = (struct a *)u.u_ap; | |
101 | ||
102 | if (uap->pid == 0) | |
103 | uap->pid = u.u_procp->p_pid; | |
104 | p = pfind(uap->pid); | |
105 | if (p == 0) { | |
106 | u.u_error = ESRCH; | |
107 | return; | |
108 | } | |
197da11b | 109 | /* need better control mechanisms for process groups */ |
4147b3f6 BJ |
110 | if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) { |
111 | u.u_error = EPERM; | |
112 | return; | |
113 | } | |
114 | p->p_pgrp = uap->pgrp; | |
115 | } | |
116 | ||
4f083fd7 SL |
117 | setreuid() |
118 | { | |
119 | struct a { | |
120 | int ruid; | |
121 | int euid; | |
122 | } *uap; | |
123 | register int ruid, euid; | |
124 | ||
125 | uap = (struct a *)u.u_ap; | |
126 | ruid = uap->ruid; | |
127 | if (ruid == -1) | |
128 | ruid = u.u_ruid; | |
129 | if (u.u_ruid != ruid && u.u_uid != ruid && !suser()) | |
130 | return; | |
131 | euid = uap->euid; | |
132 | if (euid == -1) | |
133 | euid = u.u_uid; | |
134 | if (u.u_ruid != euid && u.u_uid != euid && !suser()) | |
135 | return; | |
136 | /* | |
137 | * Everything's okay, do it. | |
138 | */ | |
4f083fd7 | 139 | #ifdef QUOTA |
709593b8 SL |
140 | if (u.u_quota->q_uid != ruid) { |
141 | qclean(); | |
142 | qstart(getquota(ruid, 0, 0)); | |
4f083fd7 | 143 | } |
709593b8 SL |
144 | #endif |
145 | u.u_procp->p_uid = ruid; | |
146 | u.u_ruid = ruid; | |
4f083fd7 SL |
147 | u.u_uid = euid; |
148 | } | |
149 | ||
4f083fd7 SL |
150 | setregid() |
151 | { | |
152 | register struct a { | |
153 | int rgid; | |
154 | int egid; | |
155 | } *uap; | |
156 | register int rgid, egid; | |
157 | ||
158 | uap = (struct a *)u.u_ap; | |
159 | rgid = uap->rgid; | |
160 | if (rgid == -1) | |
161 | rgid = u.u_rgid; | |
162 | if (u.u_rgid != rgid && u.u_gid != rgid && !suser()) | |
163 | return; | |
164 | egid = uap->egid; | |
165 | if (egid == -1) | |
166 | egid = u.u_gid; | |
167 | if (u.u_rgid != egid && u.u_gid != egid && !suser()) | |
168 | return; | |
169 | if (u.u_rgid != rgid) { | |
170 | leavegroup(u.u_rgid); | |
955b5346 | 171 | (void) entergroup(rgid); |
4f083fd7 SL |
172 | u.u_rgid = rgid; |
173 | } | |
955b5346 | 174 | u.u_gid = egid; |
4f083fd7 | 175 | } |
a05af100 | 176 | |
197da11b | 177 | setgroups() |
4147b3f6 BJ |
178 | { |
179 | register struct a { | |
b32450f4 | 180 | u_int gidsetsize; |
4147b3f6 BJ |
181 | int *gidset; |
182 | } *uap = (struct a *)u.u_ap; | |
38b6104c MK |
183 | register gid_t *gp; |
184 | register int *lp; | |
185 | int groups[NGROUPS]; | |
4147b3f6 | 186 | |
1edb1cf8 | 187 | if (!suser()) |
4147b3f6 | 188 | return; |
197da11b BJ |
189 | if (uap->gidsetsize > sizeof (u.u_groups) / sizeof (u.u_groups[0])) { |
190 | u.u_error = EINVAL; | |
4147b3f6 BJ |
191 | return; |
192 | } | |
38b6104c MK |
193 | u.u_error = copyin((caddr_t)uap->gidset, (caddr_t)groups, |
194 | uap->gidsetsize * sizeof (groups[0])); | |
127f7d76 | 195 | if (u.u_error) |
4147b3f6 | 196 | return; |
38b6104c MK |
197 | for (lp = groups, gp = u.u_groups; lp < &groups[uap->gidsetsize]; ) |
198 | *gp++ = *lp++; | |
199 | for ( ; gp < &u.u_groups[NGROUPS]; gp++) | |
f926daf9 | 200 | *gp = NOGROUP; |
4147b3f6 BJ |
201 | } |
202 | ||
f926daf9 SL |
203 | /* |
204 | * Group utility functions. | |
205 | */ | |
206 | ||
207 | /* | |
208 | * Delete gid from the group set. | |
209 | */ | |
197da11b BJ |
210 | leavegroup(gid) |
211 | int gid; | |
212 | { | |
38b6104c | 213 | register gid_t *gp; |
197da11b BJ |
214 | |
215 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) | |
216 | if (*gp == gid) | |
217 | goto found; | |
218 | return; | |
219 | found: | |
220 | for (; gp < &u.u_groups[NGROUPS-1]; gp++) | |
221 | *gp = *(gp+1); | |
f926daf9 | 222 | *gp = NOGROUP; |
197da11b BJ |
223 | } |
224 | ||
f926daf9 SL |
225 | /* |
226 | * Add gid to the group set. | |
227 | */ | |
197da11b BJ |
228 | entergroup(gid) |
229 | int gid; | |
230 | { | |
38b6104c | 231 | register gid_t *gp; |
197da11b | 232 | |
38b6104c | 233 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) { |
197da11b BJ |
234 | if (*gp == gid) |
235 | return (0); | |
38b6104c | 236 | if (*gp == NOGROUP) { |
197da11b BJ |
237 | *gp = gid; |
238 | return (0); | |
239 | } | |
38b6104c | 240 | } |
197da11b BJ |
241 | return (-1); |
242 | } | |
f926daf9 SL |
243 | |
244 | /* | |
245 | * Check if gid is a member of the group set. | |
246 | */ | |
247 | groupmember(gid) | |
38b6104c | 248 | gid_t gid; |
f926daf9 | 249 | { |
38b6104c | 250 | register gid_t *gp; |
f926daf9 SL |
251 | |
252 | if (u.u_gid == gid) | |
253 | return (1); | |
254 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS] && *gp != NOGROUP; gp++) | |
255 | if (*gp == gid) | |
256 | return (1); | |
257 | return (0); | |
258 | } |