Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |