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/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> 17 18 #include <asm/uaccess.h> 19 20 asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group) 21 { 22 long ret = sys_chown(filename, low2highuid(user), low2highgid(group)); 23 /* avoid REGPARM breakage on x86: */ 24 asmlinkage_protect(3, ret, filename, user, group); 25 return ret; 26 } 27 28 asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group) 29 { 30 long ret = sys_lchown(filename, low2highuid(user), low2highgid(group)); 31 /* avoid REGPARM breakage on x86: */ 32 asmlinkage_protect(3, ret, filename, user, group); 33 return ret; 34 } 35 36 asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group) 37 { 38 long ret = sys_fchown(fd, low2highuid(user), low2highgid(group)); 39 /* avoid REGPARM breakage on x86: */ 40 asmlinkage_protect(3, ret, fd, user, group); 41 return ret; 42 } 43 44 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid) 45 { 46 long ret = sys_setregid(low2highgid(rgid), low2highgid(egid)); 47 /* avoid REGPARM breakage on x86: */ 48 asmlinkage_protect(2, ret, rgid, egid); 49 return ret; 50 } 51 52 asmlinkage long sys_setgid16(old_gid_t gid) 53 { 54 long ret = sys_setgid(low2highgid(gid)); 55 /* avoid REGPARM breakage on x86: */ 56 asmlinkage_protect(1, ret, gid); 57 return ret; 58 } 59 60 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid) 61 { 62 long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid)); 63 /* avoid REGPARM breakage on x86: */ 64 asmlinkage_protect(2, ret, ruid, euid); 65 return ret; 66 } 67 68 asmlinkage long sys_setuid16(old_uid_t uid) 69 { 70 long ret = sys_setuid(low2highuid(uid)); 71 /* avoid REGPARM breakage on x86: */ 72 asmlinkage_protect(1, ret, uid); 73 return ret; 74 } 75 76 asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid) 77 { 78 long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid), 79 low2highuid(suid)); 80 /* avoid REGPARM breakage on x86: */ 81 asmlinkage_protect(3, ret, ruid, euid, suid); 82 return ret; 83 } 84 85 asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid) 86 { 87 const struct cred *cred = current_cred(); 88 int retval; 89 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); 93 94 return retval; 95 } 96 97 asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid) 98 { 99 long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid), 100 low2highgid(sgid)); 101 /* avoid REGPARM breakage on x86: */ 102 asmlinkage_protect(3, ret, rgid, egid, sgid); 103 return ret; 104 } 105 106 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid) 107 { 108 const struct cred *cred = current_cred(); 109 int retval; 110 111 if (!(retval = put_user(high2lowgid(cred->gid), rgid)) && 112 !(retval = put_user(high2lowgid(cred->egid), egid))) 113 retval = put_user(high2lowgid(cred->sgid), sgid); 114 115 return retval; 116 } 117 118 asmlinkage long sys_setfsuid16(old_uid_t uid) 119 { 120 long ret = sys_setfsuid(low2highuid(uid)); 121 /* avoid REGPARM breakage on x86: */ 122 asmlinkage_protect(1, ret, uid); 123 return ret; 124 } 125 126 asmlinkage long sys_setfsgid16(old_gid_t gid) 127 { 128 long ret = sys_setfsgid(low2highgid(gid)); 129 /* avoid REGPARM breakage on x86: */ 130 asmlinkage_protect(1, ret, gid); 131 return ret; 132 } 133 134 static int groups16_to_user(old_gid_t __user *grouplist, 135 struct group_info *group_info) 136 { 137 int i; 138 old_gid_t group; 139 140 for (i = 0; i < group_info->ngroups; i++) { 141 group = high2lowgid(GROUP_AT(group_info, i)); 142 if (put_user(group, grouplist+i)) 143 return -EFAULT; 144 } 145 146 return 0; 147 } 148 149 static int groups16_from_user(struct group_info *group_info, 150 old_gid_t __user *grouplist) 151 { 152 int i; 153 old_gid_t group; 154 155 for (i = 0; i < group_info->ngroups; i++) { 156 if (get_user(group, grouplist+i)) 157 return -EFAULT; 158 GROUP_AT(group_info, i) = low2highgid(group); 159 } 160 161 return 0; 162 } 163 164 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist) 165 { 166 const struct cred *cred = current_cred(); 167 int i; 168 169 if (gidsetsize < 0) 170 return -EINVAL; 171 172 i = cred->group_info->ngroups; 173 if (gidsetsize) { 174 if (i > gidsetsize) { 175 i = -EINVAL; 176 goto out; 177 } 178 if (groups16_to_user(grouplist, cred->group_info)) { 179 i = -EFAULT; 180 goto out; 181 } 182 } 183 out: 184 return i; 185 } 186 187 asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist) 188 { 189 struct group_info *group_info; 190 int retval; 191 192 if (!capable(CAP_SETGID)) 193 return -EPERM; 194 if ((unsigned)gidsetsize > NGROUPS_MAX) 195 return -EINVAL; 196 197 group_info = groups_alloc(gidsetsize); 198 if (!group_info) 199 return -ENOMEM; 200 retval = groups16_from_user(group_info, grouplist); 201 if (retval) { 202 put_group_info(group_info); 203 return retval; 204 } 205 206 retval = set_current_groups(group_info); 207 put_group_info(group_info); 208 209 return retval; 210 } 211 212 asmlinkage long sys_getuid16(void) 213 { 214 return high2lowuid(current_uid()); 215 } 216 217 asmlinkage long sys_geteuid16(void) 218 { 219 return high2lowuid(current_euid()); 220 } 221 222 asmlinkage long sys_getgid16(void) 223 { 224 return high2lowgid(current_gid()); 225 } 226 227 asmlinkage long sys_getegid16(void) 228 { 229 return high2lowgid(current_egid()); 230 } 231