Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/kernel/uid16.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 4349 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 4349 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * Wrapper functions for 16bit uid back compatibility. All nicely tied |
3 | * together in the faint hope we can take the out in five years time. |
4 | */ |
5 | |
6 | #include <linux/mm.h> |
7 | #include <linux/utsname.h> |
8 | #include <linux/mman.h> |
9 | #include <linux/smp_lock.h> |
10 | #include <linux/notifier.h> |
11 | #include <linux/reboot.h> |
12 | #include <linux/prctl.h> |
13 | #include <linux/init.h> |
14 | #include <linux/highuid.h> |
15 | #include <linux/security.h> |
16 | #include <linux/syscalls.h> |
17 | |
18 | #include <asm/uaccess.h> |
19 | |
20 | asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group) |
21 | { |
22 | return sys_chown(filename, low2highuid(user), low2highgid(group)); |
23 | } |
24 | |
25 | asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group) |
26 | { |
27 | return sys_lchown(filename, low2highuid(user), low2highgid(group)); |
28 | } |
29 | |
30 | asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group) |
31 | { |
32 | return sys_fchown(fd, low2highuid(user), low2highgid(group)); |
33 | } |
34 | |
35 | asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid) |
36 | { |
37 | return sys_setregid(low2highgid(rgid), low2highgid(egid)); |
38 | } |
39 | |
40 | asmlinkage long sys_setgid16(old_gid_t gid) |
41 | { |
42 | return sys_setgid(low2highgid(gid)); |
43 | } |
44 | |
45 | asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid) |
46 | { |
47 | return sys_setreuid(low2highuid(ruid), low2highuid(euid)); |
48 | } |
49 | |
50 | asmlinkage long sys_setuid16(old_uid_t uid) |
51 | { |
52 | return sys_setuid(low2highuid(uid)); |
53 | } |
54 | |
55 | asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid) |
56 | { |
57 | return sys_setresuid(low2highuid(ruid), low2highuid(euid), |
58 | low2highuid(suid)); |
59 | } |
60 | |
61 | asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid) |
62 | { |
63 | int retval; |
64 | |
65 | if (!(retval = put_user(high2lowuid(current->uid), ruid)) && |
66 | !(retval = put_user(high2lowuid(current->euid), euid))) |
67 | retval = put_user(high2lowuid(current->suid), suid); |
68 | |
69 | return retval; |
70 | } |
71 | |
72 | asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid) |
73 | { |
74 | return sys_setresgid(low2highgid(rgid), low2highgid(egid), |
75 | low2highgid(sgid)); |
76 | } |
77 | |
78 | asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid) |
79 | { |
80 | int retval; |
81 | |
82 | if (!(retval = put_user(high2lowgid(current->gid), rgid)) && |
83 | !(retval = put_user(high2lowgid(current->egid), egid))) |
84 | retval = put_user(high2lowgid(current->sgid), sgid); |
85 | |
86 | return retval; |
87 | } |
88 | |
89 | asmlinkage long sys_setfsuid16(old_uid_t uid) |
90 | { |
91 | return sys_setfsuid(low2highuid(uid)); |
92 | } |
93 | |
94 | asmlinkage long sys_setfsgid16(old_gid_t gid) |
95 | { |
96 | return sys_setfsgid(low2highgid(gid)); |
97 | } |
98 | |
99 | static int groups16_to_user(old_gid_t __user *grouplist, |
100 | struct group_info *group_info) |
101 | { |
102 | int i; |
103 | old_gid_t group; |
104 | |
105 | for (i = 0; i < group_info->ngroups; i++) { |
106 | group = high2lowgid(GROUP_AT(group_info, i)); |
107 | if (put_user(group, grouplist+i)) |
108 | return -EFAULT; |
109 | } |
110 | |
111 | return 0; |
112 | } |
113 | |
114 | static int groups16_from_user(struct group_info *group_info, |
115 | old_gid_t __user *grouplist) |
116 | { |
117 | int i; |
118 | old_gid_t group; |
119 | |
120 | for (i = 0; i < group_info->ngroups; i++) { |
121 | if (get_user(group, grouplist+i)) |
122 | return -EFAULT; |
123 | GROUP_AT(group_info, i) = low2highgid(group); |
124 | } |
125 | |
126 | return 0; |
127 | } |
128 | |
129 | asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist) |
130 | { |
131 | int i = 0; |
132 | |
133 | if (gidsetsize < 0) |
134 | return -EINVAL; |
135 | |
136 | get_group_info(current->group_info); |
137 | i = current->group_info->ngroups; |
138 | if (gidsetsize) { |
139 | if (i > gidsetsize) { |
140 | i = -EINVAL; |
141 | goto out; |
142 | } |
143 | if (groups16_to_user(grouplist, current->group_info)) { |
144 | i = -EFAULT; |
145 | goto out; |
146 | } |
147 | } |
148 | out: |
149 | put_group_info(current->group_info); |
150 | return i; |
151 | } |
152 | |
153 | asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist) |
154 | { |
155 | struct group_info *group_info; |
156 | int retval; |
157 | |
158 | if (!capable(CAP_SETGID)) |
159 | return -EPERM; |
160 | if ((unsigned)gidsetsize > NGROUPS_MAX) |
161 | return -EINVAL; |
162 | |
163 | group_info = groups_alloc(gidsetsize); |
164 | if (!group_info) |
165 | return -ENOMEM; |
166 | retval = groups16_from_user(group_info, grouplist); |
167 | if (retval) { |
168 | put_group_info(group_info); |
169 | return retval; |
170 | } |
171 | |
172 | retval = set_current_groups(group_info); |
173 | put_group_info(group_info); |
174 | |
175 | return retval; |
176 | } |
177 | |
178 | asmlinkage long sys_getuid16(void) |
179 | { |
180 | return high2lowuid(current->uid); |
181 | } |
182 | |
183 | asmlinkage long sys_geteuid16(void) |
184 | { |
185 | return high2lowuid(current->euid); |
186 | } |
187 | |
188 | asmlinkage long sys_getgid16(void) |
189 | { |
190 | return high2lowgid(current->gid); |
191 | } |
192 | |
193 | asmlinkage long sys_getegid16(void) |
194 | { |
195 | return high2lowgid(current->egid); |
196 | } |