Commit | Line | Data |
---|---|---|
961945a8 | 1 | /* kern_prot.c 5.13 82/12/17 */ |
a05af100 BJ |
2 | |
3 | /* | |
4147b3f6 | 4 | * System calls related to processes and protection |
a05af100 BJ |
5 | */ |
6 | ||
961945a8 SL |
7 | #include "../machine/reg.h" |
8 | ||
a05af100 BJ |
9 | #include "../h/param.h" |
10 | #include "../h/systm.h" | |
11 | #include "../h/dir.h" | |
12 | #include "../h/user.h" | |
a05af100 BJ |
13 | #include "../h/inode.h" |
14 | #include "../h/proc.h" | |
a05af100 BJ |
15 | #include "../h/timeb.h" |
16 | #include "../h/times.h" | |
17 | #include "../h/reboot.h" | |
18 | #include "../h/fs.h" | |
19 | #include "../h/conf.h" | |
20 | #include "../h/buf.h" | |
21 | #include "../h/mount.h" | |
57e12479 | 22 | #include "../h/quota.h" |
a05af100 | 23 | |
4147b3f6 BJ |
24 | getpid() |
25 | { | |
26 | ||
27 | u.u_r.r_val1 = u.u_procp->p_pid; | |
28 | u.u_r.r_val2 = u.u_procp->p_ppid; | |
29 | } | |
30 | ||
31 | getpgrp() | |
32 | { | |
33 | register struct a { | |
34 | int pid; | |
35 | } *uap = (struct a *)u.u_ap; | |
36 | register struct proc *p; | |
37 | ||
38 | if (uap->pid == 0) | |
39 | uap->pid = u.u_procp->p_pid; | |
40 | p = pfind(uap->pid); | |
41 | if (p == 0) { | |
42 | u.u_error = ESRCH; | |
43 | return; | |
44 | } | |
45 | u.u_r.r_val1 = p->p_pgrp; | |
46 | } | |
47 | ||
a05af100 BJ |
48 | getuid() |
49 | { | |
50 | ||
51 | u.u_r.r_val1 = u.u_ruid; | |
52 | u.u_r.r_val2 = u.u_uid; | |
53 | } | |
54 | ||
4147b3f6 BJ |
55 | getgid() |
56 | { | |
57 | ||
58 | u.u_r.r_val1 = u.u_rgid; | |
59 | u.u_r.r_val2 = u.u_gid; | |
60 | } | |
61 | ||
197da11b | 62 | getgroups() |
4147b3f6 BJ |
63 | { |
64 | register struct a { | |
b32450f4 | 65 | u_int gidsetsize; |
4147b3f6 BJ |
66 | int *gidset; |
67 | } *uap = (struct a *)u.u_ap; | |
197da11b | 68 | register int *gp; |
4147b3f6 | 69 | |
197da11b BJ |
70 | for (gp = &u.u_groups[NGROUPS]; gp > u.u_groups; gp--) |
71 | if (gp[-1] >= 0) | |
72 | break; | |
73 | if (uap->gidsetsize < gp - u.u_groups) { | |
74 | u.u_error = EINVAL; | |
75 | return; | |
76 | } | |
77 | uap->gidsetsize = gp - u.u_groups; | |
78 | if (copyout((caddr_t)u.u_groups, (caddr_t)uap->gidset, | |
79 | uap->gidsetsize * sizeof (u.u_groups[0]))) { | |
4147b3f6 BJ |
80 | u.u_error = EFAULT; |
81 | return; | |
82 | } | |
197da11b | 83 | u.u_r.r_val1 = uap->gidsetsize; |
4147b3f6 BJ |
84 | } |
85 | ||
86 | setpgrp() | |
87 | { | |
88 | register struct proc *p; | |
89 | register struct a { | |
90 | int pid; | |
91 | int pgrp; | |
92 | } *uap = (struct a *)u.u_ap; | |
93 | ||
94 | if (uap->pid == 0) | |
95 | uap->pid = u.u_procp->p_pid; | |
96 | p = pfind(uap->pid); | |
97 | if (p == 0) { | |
98 | u.u_error = ESRCH; | |
99 | return; | |
100 | } | |
197da11b | 101 | /* need better control mechanisms for process groups */ |
4147b3f6 BJ |
102 | if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) { |
103 | u.u_error = EPERM; | |
104 | return; | |
105 | } | |
106 | p->p_pgrp = uap->pgrp; | |
107 | } | |
108 | ||
4f083fd7 SL |
109 | setreuid() |
110 | { | |
111 | struct a { | |
112 | int ruid; | |
113 | int euid; | |
114 | } *uap; | |
115 | register int ruid, euid; | |
116 | ||
117 | uap = (struct a *)u.u_ap; | |
118 | ruid = uap->ruid; | |
119 | if (ruid == -1) | |
120 | ruid = u.u_ruid; | |
121 | if (u.u_ruid != ruid && u.u_uid != ruid && !suser()) | |
122 | return; | |
123 | euid = uap->euid; | |
124 | if (euid == -1) | |
125 | euid = u.u_uid; | |
126 | if (u.u_ruid != euid && u.u_uid != euid && !suser()) | |
127 | return; | |
128 | /* | |
129 | * Everything's okay, do it. | |
130 | */ | |
4f083fd7 | 131 | #ifdef QUOTA |
709593b8 SL |
132 | if (u.u_quota->q_uid != ruid) { |
133 | qclean(); | |
134 | qstart(getquota(ruid, 0, 0)); | |
4f083fd7 | 135 | } |
709593b8 SL |
136 | #endif |
137 | u.u_procp->p_uid = ruid; | |
138 | u.u_ruid = ruid; | |
4f083fd7 SL |
139 | u.u_uid = euid; |
140 | } | |
141 | ||
142 | #ifndef NOCOMPAT | |
143 | osetuid() | |
a05af100 BJ |
144 | { |
145 | register uid; | |
146 | register struct a { | |
147 | int uid; | |
148 | } *uap; | |
149 | ||
150 | uap = (struct a *)u.u_ap; | |
151 | uid = uap->uid; | |
152 | if (u.u_ruid == uid || u.u_uid == uid || suser()) { | |
57e12479 RE |
153 | #ifdef QUOTA |
154 | if (u.u_quota->q_uid != uid) { | |
155 | qclean(); | |
156 | qstart(getquota(uid, 0, 0)); | |
157 | } | |
158 | #endif | |
a05af100 BJ |
159 | u.u_uid = uid; |
160 | u.u_procp->p_uid = uid; | |
161 | u.u_ruid = uid; | |
162 | } | |
163 | } | |
4f083fd7 SL |
164 | #endif |
165 | ||
166 | setregid() | |
167 | { | |
168 | register struct a { | |
169 | int rgid; | |
170 | int egid; | |
171 | } *uap; | |
172 | register int rgid, egid; | |
173 | ||
174 | uap = (struct a *)u.u_ap; | |
175 | rgid = uap->rgid; | |
176 | if (rgid == -1) | |
177 | rgid = u.u_rgid; | |
178 | if (u.u_rgid != rgid && u.u_gid != rgid && !suser()) | |
179 | return; | |
180 | egid = uap->egid; | |
181 | if (egid == -1) | |
182 | egid = u.u_gid; | |
183 | if (u.u_rgid != egid && u.u_gid != egid && !suser()) | |
184 | return; | |
185 | if (u.u_rgid != rgid) { | |
186 | leavegroup(u.u_rgid); | |
187 | (void) entergroup(u.u_rgid); | |
188 | u.u_rgid = rgid; | |
189 | } | |
190 | if (u.u_gid != egid) { | |
191 | leavegroup(u.u_gid); | |
192 | (void) entergroup(egid); | |
193 | u.u_gid = egid; | |
194 | } | |
195 | } | |
a05af100 | 196 | |
4f083fd7 SL |
197 | #ifndef NOCOMPAT |
198 | osetgid() | |
a05af100 BJ |
199 | { |
200 | register gid; | |
201 | register struct a { | |
202 | int gid; | |
203 | } *uap; | |
204 | ||
205 | uap = (struct a *)u.u_ap; | |
206 | gid = uap->gid; | |
207 | if (u.u_rgid == gid || u.u_gid == gid || suser()) { | |
197da11b BJ |
208 | leavegroup(u.u_gid); leavegroup(u.u_rgid); |
209 | (void) entergroup(gid); | |
a05af100 BJ |
210 | u.u_gid = gid; |
211 | u.u_rgid = gid; | |
212 | } | |
213 | } | |
4147b3f6 | 214 | |
197da11b | 215 | setgroups() |
4147b3f6 BJ |
216 | { |
217 | register struct a { | |
b32450f4 | 218 | u_int gidsetsize; |
4147b3f6 BJ |
219 | int *gidset; |
220 | } *uap = (struct a *)u.u_ap; | |
197da11b | 221 | register int *gp; |
4147b3f6 | 222 | |
1edb1cf8 | 223 | if (!suser()) |
4147b3f6 | 224 | return; |
197da11b BJ |
225 | if (uap->gidsetsize > sizeof (u.u_groups) / sizeof (u.u_groups[0])) { |
226 | u.u_error = EINVAL; | |
4147b3f6 BJ |
227 | return; |
228 | } | |
197da11b BJ |
229 | if (copyin((caddr_t)uap->gidset, (caddr_t)u.u_groups, |
230 | uap->gidsetsize * sizeof (u.u_groups[0]))) { | |
4147b3f6 BJ |
231 | u.u_error = EFAULT; |
232 | return; | |
233 | } | |
197da11b BJ |
234 | for (gp = &u.u_groups[uap->gidsetsize]; gp < &u.u_groups[NGROUPS]; gp++) |
235 | *gp = -1; | |
4147b3f6 BJ |
236 | } |
237 | ||
238 | /* | |
239 | * Pid of zero implies current process. | |
240 | * Pgrp -1 is getpgrp system call returning | |
241 | * current process group. | |
242 | */ | |
243 | osetpgrp() | |
244 | { | |
245 | register struct proc *p; | |
246 | register struct a { | |
247 | int pid; | |
248 | int pgrp; | |
249 | } *uap; | |
250 | ||
251 | uap = (struct a *)u.u_ap; | |
252 | if (uap->pid == 0) | |
253 | p = u.u_procp; | |
254 | else { | |
255 | p = pfind(uap->pid); | |
256 | if (p == 0) { | |
257 | u.u_error = ESRCH; | |
258 | return; | |
259 | } | |
260 | } | |
261 | if (uap->pgrp <= 0) { | |
262 | u.u_r.r_val1 = p->p_pgrp; | |
263 | return; | |
264 | } | |
265 | if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) { | |
266 | u.u_error = EPERM; | |
267 | return; | |
268 | } | |
269 | p->p_pgrp = uap->pgrp; | |
270 | } | |
271 | /* END DEFUNCT */ | |
197da11b BJ |
272 | |
273 | leavegroup(gid) | |
274 | int gid; | |
275 | { | |
276 | register int *gp; | |
277 | ||
278 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) | |
279 | if (*gp == gid) | |
280 | goto found; | |
281 | return; | |
282 | found: | |
283 | for (; gp < &u.u_groups[NGROUPS-1]; gp++) | |
284 | *gp = *(gp+1); | |
b724ad1f | 285 | *gp = -1; |
197da11b BJ |
286 | } |
287 | ||
288 | entergroup(gid) | |
289 | int gid; | |
290 | { | |
291 | register int *gp; | |
292 | ||
293 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) | |
294 | if (*gp == gid) | |
295 | return (0); | |
296 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) | |
297 | if (*gp < 0) { | |
298 | *gp = gid; | |
299 | return (0); | |
300 | } | |
301 | return (-1); | |
302 | } |