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/utsname.h>
8 #include <linux/mman.h>
9 #include <linux/notifier.h>
10 #include <linux/reboot.h>
11 #include <linux/prctl.h>
12 #include <linux/capability.h>
13 #include <linux/init.h>
14 #include <linux/highuid.h>
15 #include <linux/security.h>
16 #include <linux/syscalls.h>
18 #include <asm/uaccess.h>
20 SYSCALL_DEFINE3(chown16
, const char __user
*, filename
, old_uid_t
, user
, old_gid_t
, group
)
22 long ret
= sys_chown(filename
, low2highuid(user
), low2highgid(group
));
23 /* avoid REGPARM breakage on x86: */
24 asmlinkage_protect(3, ret
, filename
, user
, group
);
28 SYSCALL_DEFINE3(lchown16
, const char __user
*, filename
, old_uid_t
, user
, old_gid_t
, group
)
30 long ret
= sys_lchown(filename
, low2highuid(user
), low2highgid(group
));
31 /* avoid REGPARM breakage on x86: */
32 asmlinkage_protect(3, ret
, filename
, user
, group
);
36 SYSCALL_DEFINE3(fchown16
, unsigned int, fd
, old_uid_t
, user
, old_gid_t
, group
)
38 long ret
= sys_fchown(fd
, low2highuid(user
), low2highgid(group
));
39 /* avoid REGPARM breakage on x86: */
40 asmlinkage_protect(3, ret
, fd
, user
, group
);
44 SYSCALL_DEFINE2(setregid16
, old_gid_t
, rgid
, old_gid_t
, egid
)
46 long ret
= sys_setregid(low2highgid(rgid
), low2highgid(egid
));
47 /* avoid REGPARM breakage on x86: */
48 asmlinkage_protect(2, ret
, rgid
, egid
);
52 SYSCALL_DEFINE1(setgid16
, old_gid_t
, gid
)
54 long ret
= sys_setgid(low2highgid(gid
));
55 /* avoid REGPARM breakage on x86: */
56 asmlinkage_protect(1, ret
, gid
);
60 SYSCALL_DEFINE2(setreuid16
, old_uid_t
, ruid
, old_uid_t
, euid
)
62 long ret
= sys_setreuid(low2highuid(ruid
), low2highuid(euid
));
63 /* avoid REGPARM breakage on x86: */
64 asmlinkage_protect(2, ret
, ruid
, euid
);
68 SYSCALL_DEFINE1(setuid16
, old_uid_t
, uid
)
70 long ret
= sys_setuid(low2highuid(uid
));
71 /* avoid REGPARM breakage on x86: */
72 asmlinkage_protect(1, ret
, uid
);
76 SYSCALL_DEFINE3(setresuid16
, old_uid_t
, ruid
, old_uid_t
, euid
, old_uid_t
, suid
)
78 long ret
= sys_setresuid(low2highuid(ruid
), low2highuid(euid
),
80 /* avoid REGPARM breakage on x86: */
81 asmlinkage_protect(3, ret
, ruid
, euid
, suid
);
85 SYSCALL_DEFINE3(getresuid16
, old_uid_t __user
*, ruid
, old_uid_t __user
*, euid
, old_uid_t __user
*, suid
)
87 const struct cred
*cred
= current_cred();
90 if (!(retval
= put_user(high2lowuid(cred
->uid
), ruid
)) &&
91 !(retval
= put_user(high2lowuid(cred
->euid
), euid
)))
92 retval
= put_user(high2lowuid(cred
->suid
), suid
);
97 SYSCALL_DEFINE3(setresgid16
, old_gid_t
, rgid
, old_gid_t
, egid
, old_gid_t
, sgid
)
99 long ret
= sys_setresgid(low2highgid(rgid
), low2highgid(egid
),
101 /* avoid REGPARM breakage on x86: */
102 asmlinkage_protect(3, ret
, rgid
, egid
, sgid
);
107 SYSCALL_DEFINE3(getresgid16
, old_gid_t __user
*, rgid
, old_gid_t __user
*, egid
, old_gid_t __user
*, sgid
)
109 const struct cred
*cred
= current_cred();
112 if (!(retval
= put_user(high2lowgid(cred
->gid
), rgid
)) &&
113 !(retval
= put_user(high2lowgid(cred
->egid
), egid
)))
114 retval
= put_user(high2lowgid(cred
->sgid
), sgid
);
119 SYSCALL_DEFINE1(setfsuid16
, old_uid_t
, uid
)
121 long ret
= sys_setfsuid(low2highuid(uid
));
122 /* avoid REGPARM breakage on x86: */
123 asmlinkage_protect(1, ret
, uid
);
127 SYSCALL_DEFINE1(setfsgid16
, old_gid_t
, gid
)
129 long ret
= sys_setfsgid(low2highgid(gid
));
130 /* avoid REGPARM breakage on x86: */
131 asmlinkage_protect(1, ret
, gid
);
135 static int groups16_to_user(old_gid_t __user
*grouplist
,
136 struct group_info
*group_info
)
141 for (i
= 0; i
< group_info
->ngroups
; i
++) {
142 group
= high2lowgid(GROUP_AT(group_info
, i
));
143 if (put_user(group
, grouplist
+i
))
150 static int groups16_from_user(struct group_info
*group_info
,
151 old_gid_t __user
*grouplist
)
156 for (i
= 0; i
< group_info
->ngroups
; i
++) {
157 if (get_user(group
, grouplist
+i
))
159 GROUP_AT(group_info
, i
) = low2highgid(group
);
165 SYSCALL_DEFINE2(getgroups16
, int, gidsetsize
, old_gid_t __user
*, grouplist
)
167 const struct cred
*cred
= current_cred();
173 i
= cred
->group_info
->ngroups
;
175 if (i
> gidsetsize
) {
179 if (groups16_to_user(grouplist
, cred
->group_info
)) {
188 SYSCALL_DEFINE2(setgroups16
, int, gidsetsize
, old_gid_t __user
*, grouplist
)
190 struct group_info
*group_info
;
193 if (!capable(CAP_SETGID
))
195 if ((unsigned)gidsetsize
> NGROUPS_MAX
)
198 group_info
= groups_alloc(gidsetsize
);
201 retval
= groups16_from_user(group_info
, grouplist
);
203 put_group_info(group_info
);
207 retval
= set_current_groups(group_info
);
208 put_group_info(group_info
);
213 SYSCALL_DEFINE0(getuid16
)
215 return high2lowuid(current_uid());
218 SYSCALL_DEFINE0(geteuid16
)
220 return high2lowuid(current_euid());
223 SYSCALL_DEFINE0(getgid16
)
225 return high2lowgid(current_gid());
228 SYSCALL_DEFINE0(getegid16
)
230 return high2lowgid(current_egid());
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