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.
7 #include <linux/mman.h>
8 #include <linux/notifier.h>
9 #include <linux/reboot.h>
10 #include <linux/prctl.h>
11 #include <linux/capability.h>
12 #include <linux/init.h>
13 #include <linux/highuid.h>
14 #include <linux/security.h>
15 #include <linux/syscalls.h>
17 #include <asm/uaccess.h>
19 SYSCALL_DEFINE3(chown16
, const char __user
*, filename
, old_uid_t
, user
, old_gid_t
, group
)
21 return sys_chown(filename
, low2highuid(user
), low2highgid(group
));
24 SYSCALL_DEFINE3(lchown16
, const char __user
*, filename
, old_uid_t
, user
, old_gid_t
, group
)
26 return sys_lchown(filename
, low2highuid(user
), low2highgid(group
));
29 SYSCALL_DEFINE3(fchown16
, unsigned int, fd
, old_uid_t
, user
, old_gid_t
, group
)
31 return sys_fchown(fd
, low2highuid(user
), low2highgid(group
));
34 SYSCALL_DEFINE2(setregid16
, old_gid_t
, rgid
, old_gid_t
, egid
)
36 return sys_setregid(low2highgid(rgid
), low2highgid(egid
));
39 SYSCALL_DEFINE1(setgid16
, old_gid_t
, gid
)
41 return sys_setgid(low2highgid(gid
));
44 SYSCALL_DEFINE2(setreuid16
, old_uid_t
, ruid
, old_uid_t
, euid
)
46 return sys_setreuid(low2highuid(ruid
), low2highuid(euid
));
49 SYSCALL_DEFINE1(setuid16
, old_uid_t
, uid
)
51 return sys_setuid(low2highuid(uid
));
54 SYSCALL_DEFINE3(setresuid16
, old_uid_t
, ruid
, old_uid_t
, euid
, old_uid_t
, suid
)
56 return sys_setresuid(low2highuid(ruid
), low2highuid(euid
),
60 SYSCALL_DEFINE3(getresuid16
, old_uid_t __user
*, ruidp
, old_uid_t __user
*, euidp
, old_uid_t __user
*, suidp
)
62 const struct cred
*cred
= current_cred();
64 old_uid_t ruid
, euid
, suid
;
66 ruid
= high2lowuid(from_kuid_munged(cred
->user_ns
, cred
->uid
));
67 euid
= high2lowuid(from_kuid_munged(cred
->user_ns
, cred
->euid
));
68 suid
= high2lowuid(from_kuid_munged(cred
->user_ns
, cred
->suid
));
70 if (!(retval
= put_user(ruid
, ruidp
)) &&
71 !(retval
= put_user(euid
, euidp
)))
72 retval
= put_user(suid
, suidp
);
77 SYSCALL_DEFINE3(setresgid16
, old_gid_t
, rgid
, old_gid_t
, egid
, old_gid_t
, sgid
)
79 return sys_setresgid(low2highgid(rgid
), low2highgid(egid
),
84 SYSCALL_DEFINE3(getresgid16
, old_gid_t __user
*, rgidp
, old_gid_t __user
*, egidp
, old_gid_t __user
*, sgidp
)
86 const struct cred
*cred
= current_cred();
88 old_gid_t rgid
, egid
, sgid
;
90 rgid
= high2lowgid(from_kgid_munged(cred
->user_ns
, cred
->gid
));
91 egid
= high2lowgid(from_kgid_munged(cred
->user_ns
, cred
->egid
));
92 sgid
= high2lowgid(from_kgid_munged(cred
->user_ns
, cred
->sgid
));
94 if (!(retval
= put_user(rgid
, rgidp
)) &&
95 !(retval
= put_user(egid
, egidp
)))
96 retval
= put_user(sgid
, sgidp
);
101 SYSCALL_DEFINE1(setfsuid16
, old_uid_t
, uid
)
103 return sys_setfsuid(low2highuid(uid
));
106 SYSCALL_DEFINE1(setfsgid16
, old_gid_t
, gid
)
108 return sys_setfsgid(low2highgid(gid
));
111 static int groups16_to_user(old_gid_t __user
*grouplist
,
112 struct group_info
*group_info
)
114 struct user_namespace
*user_ns
= current_user_ns();
119 for (i
= 0; i
< group_info
->ngroups
; i
++) {
120 kgid
= GROUP_AT(group_info
, i
);
121 group
= high2lowgid(from_kgid_munged(user_ns
, kgid
));
122 if (put_user(group
, grouplist
+i
))
129 static int groups16_from_user(struct group_info
*group_info
,
130 old_gid_t __user
*grouplist
)
132 struct user_namespace
*user_ns
= current_user_ns();
137 for (i
= 0; i
< group_info
->ngroups
; i
++) {
138 if (get_user(group
, grouplist
+i
))
141 kgid
= make_kgid(user_ns
, low2highgid(group
));
142 if (!gid_valid(kgid
))
145 GROUP_AT(group_info
, i
) = kgid
;
151 SYSCALL_DEFINE2(getgroups16
, int, gidsetsize
, old_gid_t __user
*, grouplist
)
153 const struct cred
*cred
= current_cred();
159 i
= cred
->group_info
->ngroups
;
161 if (i
> gidsetsize
) {
165 if (groups16_to_user(grouplist
, cred
->group_info
)) {
174 SYSCALL_DEFINE2(setgroups16
, int, gidsetsize
, old_gid_t __user
*, grouplist
)
176 struct group_info
*group_info
;
179 if (!ns_capable(current_user_ns(), CAP_SETGID
))
181 if ((unsigned)gidsetsize
> NGROUPS_MAX
)
184 group_info
= groups_alloc(gidsetsize
);
187 retval
= groups16_from_user(group_info
, grouplist
);
189 put_group_info(group_info
);
193 retval
= set_current_groups(group_info
);
194 put_group_info(group_info
);
199 SYSCALL_DEFINE0(getuid16
)
201 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
204 SYSCALL_DEFINE0(geteuid16
)
206 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
209 SYSCALL_DEFINE0(getgid16
)
211 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
214 SYSCALL_DEFINE0(getegid16
)
216 return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
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