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uid16.c

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 16 #include <asm/uaccess.h>
 17 
 18 extern asmlinkage long sys_chown(const char *, uid_t,gid_t);
 19 extern asmlinkage long sys_lchown(const char *, uid_t,gid_t);
 20 extern asmlinkage long sys_fchown(unsigned int, uid_t,gid_t);
 21 extern asmlinkage long sys_setregid(gid_t, gid_t);
 22 extern asmlinkage long sys_setgid(gid_t);
 23 extern asmlinkage long sys_setreuid(uid_t, uid_t);
 24 extern asmlinkage long sys_setuid(uid_t);
 25 extern asmlinkage long sys_setresuid(uid_t, uid_t, uid_t);
 26 extern asmlinkage long sys_setresgid(gid_t, gid_t, gid_t);
 27 extern asmlinkage long sys_setfsuid(uid_t);
 28 extern asmlinkage long sys_setfsgid(gid_t);
 29  
 30 asmlinkage long sys_chown16(const char * filename, old_uid_t user, old_gid_t group)
 31 {
 32         return sys_chown(filename, low2highuid(user), low2highgid(group));
 33 }
 34 
 35 asmlinkage long sys_lchown16(const char * filename, old_uid_t user, old_gid_t group)
 36 {
 37         return sys_lchown(filename, low2highuid(user), low2highgid(group));
 38 }
 39 
 40 asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
 41 {
 42         return sys_fchown(fd, low2highuid(user), low2highgid(group));
 43 }
 44 
 45 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
 46 {
 47         return sys_setregid(low2highgid(rgid), low2highgid(egid));
 48 }
 49 
 50 asmlinkage long sys_setgid16(old_gid_t gid)
 51 {
 52         return sys_setgid((gid_t)gid);
 53 }
 54 
 55 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
 56 {
 57         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
 58 }
 59 
 60 asmlinkage long sys_setuid16(old_uid_t uid)
 61 {
 62         return sys_setuid((uid_t)uid);
 63 }
 64 
 65 asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
 66 {
 67         return sys_setresuid(low2highuid(ruid), low2highuid(euid),
 68                 low2highuid(suid));
 69 }
 70 
 71 asmlinkage long sys_getresuid16(old_uid_t *ruid, old_uid_t *euid, old_uid_t *suid)
 72 {
 73         int retval;
 74 
 75         if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
 76             !(retval = put_user(high2lowuid(current->euid), euid)))
 77                 retval = put_user(high2lowuid(current->suid), suid);
 78 
 79         return retval;
 80 }
 81 
 82 asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
 83 {
 84         return sys_setresgid(low2highgid(rgid), low2highgid(egid),
 85                 low2highgid(sgid));
 86 }
 87 
 88 asmlinkage long sys_getresgid16(old_gid_t *rgid, old_gid_t *egid, old_gid_t *sgid)
 89 {
 90         int retval;
 91 
 92         if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
 93             !(retval = put_user(high2lowgid(current->egid), egid)))
 94                 retval = put_user(high2lowgid(current->sgid), sgid);
 95 
 96         return retval;
 97 }
 98 
 99 asmlinkage long sys_setfsuid16(old_uid_t uid)
100 {
101         return sys_setfsuid((uid_t)uid);
102 }
103 
104 asmlinkage long sys_setfsgid16(old_gid_t gid)
105 {
106         return sys_setfsgid((gid_t)gid);
107 }
108 
109 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t *grouplist)
110 {
111         old_gid_t groups[NGROUPS];
112         int i,j;
113 
114         if (gidsetsize < 0)
115                 return -EINVAL;
116         i = current->ngroups;
117         if (gidsetsize) {
118                 if (i > gidsetsize)
119                         return -EINVAL;
120                 for(j=0;j<i;j++)
121                         groups[j] = current->groups[j];
122                 if (copy_to_user(grouplist, groups, sizeof(old_gid_t)*i))
123                         return -EFAULT;
124         }
125         return i;
126 }
127 
128 asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t *grouplist)
129 {
130         old_gid_t groups[NGROUPS];
131         int i;
132 
133         if (!capable(CAP_SETGID))
134                 return -EPERM;
135         if ((unsigned) gidsetsize > NGROUPS)
136                 return -EINVAL;
137         if (copy_from_user(groups, grouplist, gidsetsize * sizeof(old_gid_t)))
138                 return -EFAULT;
139         for (i = 0 ; i < gidsetsize ; i++)
140                 current->groups[i] = (gid_t)groups[i];
141         current->ngroups = gidsetsize;
142         return 0;
143 }
144 
145 asmlinkage long sys_getuid16(void)
146 {
147         return high2lowuid(current->uid);
148 }
149 
150 asmlinkage long sys_geteuid16(void)
151 {
152         return high2lowuid(current->euid);
153 }
154 
155 asmlinkage long sys_getgid16(void)
156 {
157         return high2lowgid(current->gid);
158 }
159 
160 asmlinkage long sys_getegid16(void)
161 {
162         return high2lowgid(current->egid);
163 }
164

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Linux Cross Reference Linux/kernel/uid16.c

Linux Cross Reference
Linux/kernel/uid16.c