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 asmlinkage
long sys_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 prevent_tail_call(ret
);
28 asmlinkage
long sys_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 prevent_tail_call(ret
);
36 asmlinkage
long sys_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 prevent_tail_call(ret
);
44 asmlinkage
long sys_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 prevent_tail_call(ret
);
52 asmlinkage
long sys_setgid16(old_gid_t gid
)
54 long ret
= sys_setgid(low2highgid(gid
));
55 /* avoid REGPARM breakage on x86: */
56 prevent_tail_call(ret
);
60 asmlinkage
long sys_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 prevent_tail_call(ret
);
68 asmlinkage
long sys_setuid16(old_uid_t uid
)
70 long ret
= sys_setuid(low2highuid(uid
));
71 /* avoid REGPARM breakage on x86: */
72 prevent_tail_call(ret
);
76 asmlinkage
long sys_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 prevent_tail_call(ret
);
85 asmlinkage
long sys_getresuid16(old_uid_t __user
*ruid
, old_uid_t __user
*euid
, old_uid_t __user
*suid
)
89 if (!(retval
= put_user(high2lowuid(current
->uid
), ruid
)) &&
90 !(retval
= put_user(high2lowuid(current
->euid
), euid
)))
91 retval
= put_user(high2lowuid(current
->suid
), suid
);
96 asmlinkage
long sys_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 prevent_tail_call(ret
);
105 asmlinkage
long sys_getresgid16(old_gid_t __user
*rgid
, old_gid_t __user
*egid
, old_gid_t __user
*sgid
)
109 if (!(retval
= put_user(high2lowgid(current
->gid
), rgid
)) &&
110 !(retval
= put_user(high2lowgid(current
->egid
), egid
)))
111 retval
= put_user(high2lowgid(current
->sgid
), sgid
);
116 asmlinkage
long sys_setfsuid16(old_uid_t uid
)
118 long ret
= sys_setfsuid(low2highuid(uid
));
119 /* avoid REGPARM breakage on x86: */
120 prevent_tail_call(ret
);
124 asmlinkage
long sys_setfsgid16(old_gid_t gid
)
126 long ret
= sys_setfsgid(low2highgid(gid
));
127 /* avoid REGPARM breakage on x86: */
128 prevent_tail_call(ret
);
132 static int groups16_to_user(old_gid_t __user
*grouplist
,
133 struct group_info
*group_info
)
138 for (i
= 0; i
< group_info
->ngroups
; i
++) {
139 group
= high2lowgid(GROUP_AT(group_info
, i
));
140 if (put_user(group
, grouplist
+i
))
147 static int groups16_from_user(struct group_info
*group_info
,
148 old_gid_t __user
*grouplist
)
153 for (i
= 0; i
< group_info
->ngroups
; i
++) {
154 if (get_user(group
, grouplist
+i
))
156 GROUP_AT(group_info
, i
) = low2highgid(group
);
162 asmlinkage
long sys_getgroups16(int gidsetsize
, old_gid_t __user
*grouplist
)
169 get_group_info(current
->group_info
);
170 i
= current
->group_info
->ngroups
;
172 if (i
> gidsetsize
) {
176 if (groups16_to_user(grouplist
, current
->group_info
)) {
182 put_group_info(current
->group_info
);
186 asmlinkage
long sys_setgroups16(int gidsetsize
, old_gid_t __user
*grouplist
)
188 struct group_info
*group_info
;
191 if (!capable(CAP_SETGID
))
193 if ((unsigned)gidsetsize
> NGROUPS_MAX
)
196 group_info
= groups_alloc(gidsetsize
);
199 retval
= groups16_from_user(group_info
, grouplist
);
201 put_group_info(group_info
);
205 retval
= set_current_groups(group_info
);
206 put_group_info(group_info
);
211 asmlinkage
long sys_getuid16(void)
213 return high2lowuid(current
->uid
);
216 asmlinkage
long sys_geteuid16(void)
218 return high2lowuid(current
->euid
);
221 asmlinkage
long sys_getgid16(void)
223 return high2lowgid(current
->gid
);
226 asmlinkage
long sys_getegid16(void)
228 return high2lowgid(current
->egid
);
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