Commit | Line | Data |
---|---|---|
94368568 | 1 | /* kern_prot.c 6.2 84/08/29 */ |
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 | ||
94368568 JB |
9 | #include "param.h" |
10 | #include "systm.h" | |
11 | #include "dir.h" | |
12 | #include "user.h" | |
13 | #include "inode.h" | |
14 | #include "proc.h" | |
15 | #include "timeb.h" | |
16 | #include "times.h" | |
17 | #include "reboot.h" | |
18 | #include "fs.h" | |
19 | #include "conf.h" | |
20 | #include "buf.h" | |
21 | #include "mount.h" | |
22 | #include "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; | |
127f7d76 SL |
78 | u.u_error = copyout((caddr_t)u.u_groups, (caddr_t)uap->gidset, |
79 | uap->gidsetsize * sizeof (u.u_groups[0])); | |
80 | if (u.u_error) | |
4147b3f6 | 81 | return; |
197da11b | 82 | u.u_r.r_val1 = uap->gidsetsize; |
4147b3f6 BJ |
83 | } |
84 | ||
85 | setpgrp() | |
86 | { | |
87 | register struct proc *p; | |
88 | register struct a { | |
89 | int pid; | |
90 | int pgrp; | |
91 | } *uap = (struct a *)u.u_ap; | |
92 | ||
93 | if (uap->pid == 0) | |
94 | uap->pid = u.u_procp->p_pid; | |
95 | p = pfind(uap->pid); | |
96 | if (p == 0) { | |
97 | u.u_error = ESRCH; | |
98 | return; | |
99 | } | |
197da11b | 100 | /* need better control mechanisms for process groups */ |
4147b3f6 BJ |
101 | if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) { |
102 | u.u_error = EPERM; | |
103 | return; | |
104 | } | |
105 | p->p_pgrp = uap->pgrp; | |
106 | } | |
107 | ||
4f083fd7 SL |
108 | setreuid() |
109 | { | |
110 | struct a { | |
111 | int ruid; | |
112 | int euid; | |
113 | } *uap; | |
114 | register int ruid, euid; | |
115 | ||
116 | uap = (struct a *)u.u_ap; | |
117 | ruid = uap->ruid; | |
118 | if (ruid == -1) | |
119 | ruid = u.u_ruid; | |
120 | if (u.u_ruid != ruid && u.u_uid != ruid && !suser()) | |
121 | return; | |
122 | euid = uap->euid; | |
123 | if (euid == -1) | |
124 | euid = u.u_uid; | |
125 | if (u.u_ruid != euid && u.u_uid != euid && !suser()) | |
126 | return; | |
127 | /* | |
128 | * Everything's okay, do it. | |
129 | */ | |
4f083fd7 | 130 | #ifdef QUOTA |
709593b8 SL |
131 | if (u.u_quota->q_uid != ruid) { |
132 | qclean(); | |
133 | qstart(getquota(ruid, 0, 0)); | |
4f083fd7 | 134 | } |
709593b8 SL |
135 | #endif |
136 | u.u_procp->p_uid = ruid; | |
137 | u.u_ruid = ruid; | |
4f083fd7 SL |
138 | u.u_uid = euid; |
139 | } | |
140 | ||
4f083fd7 SL |
141 | setregid() |
142 | { | |
143 | register struct a { | |
144 | int rgid; | |
145 | int egid; | |
146 | } *uap; | |
147 | register int rgid, egid; | |
148 | ||
149 | uap = (struct a *)u.u_ap; | |
150 | rgid = uap->rgid; | |
151 | if (rgid == -1) | |
152 | rgid = u.u_rgid; | |
153 | if (u.u_rgid != rgid && u.u_gid != rgid && !suser()) | |
154 | return; | |
155 | egid = uap->egid; | |
156 | if (egid == -1) | |
157 | egid = u.u_gid; | |
158 | if (u.u_rgid != egid && u.u_gid != egid && !suser()) | |
159 | return; | |
160 | if (u.u_rgid != rgid) { | |
161 | leavegroup(u.u_rgid); | |
955b5346 | 162 | (void) entergroup(rgid); |
4f083fd7 SL |
163 | u.u_rgid = rgid; |
164 | } | |
955b5346 | 165 | u.u_gid = egid; |
4f083fd7 | 166 | } |
a05af100 | 167 | |
197da11b | 168 | setgroups() |
4147b3f6 BJ |
169 | { |
170 | register struct a { | |
b32450f4 | 171 | u_int gidsetsize; |
4147b3f6 BJ |
172 | int *gidset; |
173 | } *uap = (struct a *)u.u_ap; | |
197da11b | 174 | register int *gp; |
4147b3f6 | 175 | |
1edb1cf8 | 176 | if (!suser()) |
4147b3f6 | 177 | return; |
197da11b BJ |
178 | if (uap->gidsetsize > sizeof (u.u_groups) / sizeof (u.u_groups[0])) { |
179 | u.u_error = EINVAL; | |
4147b3f6 BJ |
180 | return; |
181 | } | |
127f7d76 SL |
182 | u.u_error = copyin((caddr_t)uap->gidset, (caddr_t)u.u_groups, |
183 | uap->gidsetsize * sizeof (u.u_groups[0])); | |
184 | if (u.u_error) | |
4147b3f6 | 185 | return; |
197da11b | 186 | for (gp = &u.u_groups[uap->gidsetsize]; gp < &u.u_groups[NGROUPS]; gp++) |
f926daf9 | 187 | *gp = NOGROUP; |
4147b3f6 BJ |
188 | } |
189 | ||
f926daf9 SL |
190 | /* |
191 | * Group utility functions. | |
192 | */ | |
193 | ||
194 | /* | |
195 | * Delete gid from the group set. | |
196 | */ | |
197da11b BJ |
197 | leavegroup(gid) |
198 | int gid; | |
199 | { | |
200 | register int *gp; | |
201 | ||
202 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) | |
203 | if (*gp == gid) | |
204 | goto found; | |
205 | return; | |
206 | found: | |
207 | for (; gp < &u.u_groups[NGROUPS-1]; gp++) | |
208 | *gp = *(gp+1); | |
f926daf9 | 209 | *gp = NOGROUP; |
197da11b BJ |
210 | } |
211 | ||
f926daf9 SL |
212 | /* |
213 | * Add gid to the group set. | |
214 | */ | |
197da11b BJ |
215 | entergroup(gid) |
216 | int gid; | |
217 | { | |
218 | register int *gp; | |
219 | ||
220 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) | |
221 | if (*gp == gid) | |
222 | return (0); | |
223 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++) | |
224 | if (*gp < 0) { | |
225 | *gp = gid; | |
226 | return (0); | |
227 | } | |
228 | return (-1); | |
229 | } | |
f926daf9 SL |
230 | |
231 | /* | |
232 | * Check if gid is a member of the group set. | |
233 | */ | |
234 | groupmember(gid) | |
235 | int gid; | |
236 | { | |
237 | register int *gp; | |
238 | ||
239 | if (u.u_gid == gid) | |
240 | return (1); | |
241 | for (gp = u.u_groups; gp < &u.u_groups[NGROUPS] && *gp != NOGROUP; gp++) | |
242 | if (*gp == gid) | |
243 | return (1); | |
244 | return (0); | |
245 | } |