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 long ret
= sys_chown(filename
, low2highuid(user
), low2highgid(group
));
22 /* avoid REGPARM breakage on x86: */
23 asmlinkage_protect(3, ret
, filename
, user
, group
);
27 SYSCALL_DEFINE3(lchown16
, const char __user
*, filename
, old_uid_t
, user
, old_gid_t
, group
)
29 long ret
= sys_lchown(filename
, low2highuid(user
), low2highgid(group
));
30 /* avoid REGPARM breakage on x86: */
31 asmlinkage_protect(3, ret
, filename
, user
, group
);
35 SYSCALL_DEFINE3(fchown16
, unsigned int, fd
, old_uid_t
, user
, old_gid_t
, group
)
37 long ret
= sys_fchown(fd
, low2highuid(user
), low2highgid(group
));
38 /* avoid REGPARM breakage on x86: */
39 asmlinkage_protect(3, ret
, fd
, user
, group
);
43 SYSCALL_DEFINE2(setregid16
, old_gid_t
, rgid
, old_gid_t
, egid
)
45 long ret
= sys_setregid(low2highgid(rgid
), low2highgid(egid
));
46 /* avoid REGPARM breakage on x86: */
47 asmlinkage_protect(2, ret
, rgid
, egid
);
51 SYSCALL_DEFINE1(setgid16
, old_gid_t
, gid
)
53 long ret
= sys_setgid(low2highgid(gid
));
54 /* avoid REGPARM breakage on x86: */
55 asmlinkage_protect(1, ret
, gid
);
59 SYSCALL_DEFINE2(setreuid16
, old_uid_t
, ruid
, old_uid_t
, euid
)
61 long ret
= sys_setreuid(low2highuid(ruid
), low2highuid(euid
));
62 /* avoid REGPARM breakage on x86: */
63 asmlinkage_protect(2, ret
, ruid
, euid
);
67 SYSCALL_DEFINE1(setuid16
, old_uid_t
, uid
)
69 long ret
= sys_setuid(low2highuid(uid
));
70 /* avoid REGPARM breakage on x86: */
71 asmlinkage_protect(1, ret
, uid
);
75 SYSCALL_DEFINE3(setresuid16
, old_uid_t
, ruid
, old_uid_t
, euid
, old_uid_t
, suid
)
77 long ret
= sys_setresuid(low2highuid(ruid
), low2highuid(euid
),
79 /* avoid REGPARM breakage on x86: */
80 asmlinkage_protect(3, ret
, ruid
, euid
, suid
);
84 SYSCALL_DEFINE3(getresuid16
, old_uid_t __user
*, ruid
, old_uid_t __user
*, euid
, old_uid_t __user
*, suid
)
86 const struct cred
*cred
= current_cred();
89 if (!(retval
= put_user(high2lowuid(cred
->uid
), ruid
)) &&
90 !(retval
= put_user(high2lowuid(cred
->euid
), euid
)))
91 retval
= put_user(high2lowuid(cred
->suid
), suid
);
96 SYSCALL_DEFINE3(setresgid16
, old_gid_t
, rgid
, old_gid_t
, egid
, old_gid_t
, sgid
)
98 long ret
= sys_setresgid(low2highgid(rgid
), low2highgid(egid
),
100 /* avoid REGPARM breakage on x86: */
101 asmlinkage_protect(3, ret
, rgid
, egid
, sgid
);
106 SYSCALL_DEFINE3(getresgid16
, old_gid_t __user
*, rgid
, old_gid_t __user
*, egid
, old_gid_t __user
*, sgid
)
108 const struct cred
*cred
= current_cred();
111 if (!(retval
= put_user(high2lowgid(cred
->gid
), rgid
)) &&
112 !(retval
= put_user(high2lowgid(cred
->egid
), egid
)))
113 retval
= put_user(high2lowgid(cred
->sgid
), sgid
);
118 SYSCALL_DEFINE1(setfsuid16
, old_uid_t
, uid
)
120 long ret
= sys_setfsuid(low2highuid(uid
));
121 /* avoid REGPARM breakage on x86: */
122 asmlinkage_protect(1, ret
, uid
);
126 SYSCALL_DEFINE1(setfsgid16
, old_gid_t
, gid
)
128 long ret
= sys_setfsgid(low2highgid(gid
));
129 /* avoid REGPARM breakage on x86: */
130 asmlinkage_protect(1, ret
, gid
);
134 static int groups16_to_user(old_gid_t __user
*grouplist
,
135 struct group_info
*group_info
)
140 for (i
= 0; i
< group_info
->ngroups
; i
++) {
141 group
= high2lowgid(GROUP_AT(group_info
, i
));
142 if (put_user(group
, grouplist
+i
))
149 static int groups16_from_user(struct group_info
*group_info
,
150 old_gid_t __user
*grouplist
)
155 for (i
= 0; i
< group_info
->ngroups
; i
++) {
156 if (get_user(group
, grouplist
+i
))
158 GROUP_AT(group_info
, i
) = low2highgid(group
);
164 SYSCALL_DEFINE2(getgroups16
, int, gidsetsize
, old_gid_t __user
*, grouplist
)
166 const struct cred
*cred
= current_cred();
172 i
= cred
->group_info
->ngroups
;
174 if (i
> gidsetsize
) {
178 if (groups16_to_user(grouplist
, cred
->group_info
)) {
187 SYSCALL_DEFINE2(setgroups16
, int, gidsetsize
, old_gid_t __user
*, grouplist
)
189 struct group_info
*group_info
;
192 if (!capable(CAP_SETGID
))
194 if ((unsigned)gidsetsize
> NGROUPS_MAX
)
197 group_info
= groups_alloc(gidsetsize
);
200 retval
= groups16_from_user(group_info
, grouplist
);
202 put_group_info(group_info
);
206 retval
= set_current_groups(group_info
);
207 put_group_info(group_info
);
212 SYSCALL_DEFINE0(getuid16
)
214 return high2lowuid(current_uid());
217 SYSCALL_DEFINE0(geteuid16
)
219 return high2lowuid(current_euid());
222 SYSCALL_DEFINE0(getgid16
)
224 return high2lowgid(current_gid());
227 SYSCALL_DEFINE0(getegid16
)
229 return high2lowgid(current_egid());
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