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 #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 return sys_chown(filename, low2highuid(user), low2highgid(group)); 23 } 24 25 asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group) 26 { 27 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 28 } 29 30 asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group) 31 { 32 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 33 } 34 35 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid) 36 { 37 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 38 } 39 40 asmlinkage long sys_setgid16(old_gid_t gid) 41 { 42 return sys_setgid(low2highgid(gid)); 43 } 44 45 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid) 46 { 47 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 48 } 49 50 asmlinkage long sys_setuid16(old_uid_t uid) 51 { 52 return sys_setuid(low2highuid(uid)); 53 } 54 55 asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid) 56 { 57 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 58 low2highuid(suid)); 59 } 60 61 asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid) 62 { 63 int retval; 64 65 if (!(retval = put_user(high2lowuid(current->uid), ruid)) && 66 !(retval = put_user(high2lowuid(current->euid), euid))) 67 retval = put_user(high2lowuid(current->suid), suid); 68 69 return retval; 70 } 71 72 asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid) 73 { 74 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 75 low2highgid(sgid)); 76 } 77 78 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid) 79 { 80 int retval; 81 82 if (!(retval = put_user(high2lowgid(current->gid), rgid)) && 83 !(retval = put_user(high2lowgid(current->egid), egid))) 84 retval = put_user(high2lowgid(current->sgid), sgid); 85 86 return retval; 87 } 88 89 asmlinkage long sys_setfsuid16(old_uid_t uid) 90 { 91 return sys_setfsuid(low2highuid(uid)); 92 } 93 94 asmlinkage long sys_setfsgid16(old_gid_t gid) 95 { 96 return sys_setfsgid(low2highgid(gid)); 97 } 98 99 static int groups16_to_user(old_gid_t __user *grouplist, 100 struct group_info *group_info) 101 { 102 int i; 103 old_gid_t group; 104 105 for (i = 0; i < group_info->ngroups; i++) { 106 group = high2lowgid(GROUP_AT(group_info, i)); 107 if (put_user(group, grouplist+i)) 108 return -EFAULT; 109 } 110 111 return 0; 112 } 113 114 static int groups16_from_user(struct group_info *group_info, 115 old_gid_t __user *grouplist) 116 { 117 int i; 118 old_gid_t group; 119 120 for (i = 0; i < group_info->ngroups; i++) { 121 if (get_user(group, grouplist+i)) 122 return -EFAULT; 123 GROUP_AT(group_info, i) = low2highgid(group); 124 } 125 126 return 0; 127 } 128 129 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist) 130 { 131 int i = 0; 132 133 if (gidsetsize < 0) 134 return -EINVAL; 135 136 get_group_info(current->group_info); 137 i = current->group_info->ngroups; 138 if (gidsetsize) { 139 if (i > gidsetsize) { 140 i = -EINVAL; 141 goto out; 142 } 143 if (groups16_to_user(grouplist, current->group_info)) { 144 i = -EFAULT; 145 goto out; 146 } 147 } 148 out: 149 put_group_info(current->group_info); 150 return i; 151 } 152 153 asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist) 154 { 155 struct group_info *group_info; 156 int retval; 157 158 if (!capable(CAP_SETGID)) 159 return -EPERM; 160 if ((unsigned)gidsetsize > NGROUPS_MAX) 161 return -EINVAL; 162 163 group_info = groups_alloc(gidsetsize); 164 if (!group_info) 165 return -ENOMEM; 166 retval = groups16_from_user(group_info, grouplist); 167 if (retval) { 168 put_group_info(group_info); 169 return retval; 170 } 171 172 retval = set_current_groups(group_info); 173 put_group_info(group_info); 174 175 return retval; 176 } 177 178 asmlinkage long sys_getuid16(void) 179 { 180 return high2lowuid(current->uid); 181 } 182 183 asmlinkage long sys_geteuid16(void) 184 { 185 return high2lowuid(current->euid); 186 } 187 188 asmlinkage long sys_getgid16(void) 189 { 190 return high2lowgid(current->gid); 191 } 192 193 asmlinkage long sys_getegid16(void) 194 { 195 return high2lowgid(current->egid); 196 } 197