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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/notifier.h> |
| 10 | #include <linux/reboot.h> |
| 11 | #include <linux/prctl.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 12 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 22 | long ret = sys_chown(filename, low2highuid(user), low2highgid(group)); |
| 23 | /* avoid REGPARM breakage on x86: */ |
| 24 | prevent_tail_call(ret); |
| 25 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | } |
| 27 | |
| 28 | asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group) |
| 29 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 30 | long ret = sys_lchown(filename, low2highuid(user), low2highgid(group)); |
| 31 | /* avoid REGPARM breakage on x86: */ |
| 32 | prevent_tail_call(ret); |
| 33 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | } |
| 35 | |
| 36 | asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group) |
| 37 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 38 | long ret = sys_fchown(fd, low2highuid(user), low2highgid(group)); |
| 39 | /* avoid REGPARM breakage on x86: */ |
| 40 | prevent_tail_call(ret); |
| 41 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid) |
| 45 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 46 | long ret = sys_setregid(low2highgid(rgid), low2highgid(egid)); |
| 47 | /* avoid REGPARM breakage on x86: */ |
| 48 | prevent_tail_call(ret); |
| 49 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | asmlinkage long sys_setgid16(old_gid_t gid) |
| 53 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 54 | long ret = sys_setgid(low2highgid(gid)); |
| 55 | /* avoid REGPARM breakage on x86: */ |
| 56 | prevent_tail_call(ret); |
| 57 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid) |
| 61 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 62 | long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid)); |
| 63 | /* avoid REGPARM breakage on x86: */ |
| 64 | prevent_tail_call(ret); |
| 65 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | asmlinkage long sys_setuid16(old_uid_t uid) |
| 69 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 70 | long ret = sys_setuid(low2highuid(uid)); |
| 71 | /* avoid REGPARM breakage on x86: */ |
| 72 | prevent_tail_call(ret); |
| 73 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid) |
| 77 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 78 | long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid), |
| 79 | low2highuid(suid)); |
| 80 | /* avoid REGPARM breakage on x86: */ |
| 81 | prevent_tail_call(ret); |
| 82 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid) |
| 86 | { |
| 87 | int retval; |
| 88 | |
| 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); |
| 92 | |
| 93 | return retval; |
| 94 | } |
| 95 | |
| 96 | asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid) |
| 97 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 98 | long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid), |
| 99 | low2highgid(sgid)); |
| 100 | /* avoid REGPARM breakage on x86: */ |
| 101 | prevent_tail_call(ret); |
| 102 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid) |
| 106 | { |
| 107 | int retval; |
| 108 | |
| 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); |
| 112 | |
| 113 | return retval; |
| 114 | } |
| 115 | |
| 116 | asmlinkage long sys_setfsuid16(old_uid_t uid) |
| 117 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 118 | long ret = sys_setfsuid(low2highuid(uid)); |
| 119 | /* avoid REGPARM breakage on x86: */ |
| 120 | prevent_tail_call(ret); |
| 121 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | asmlinkage long sys_setfsgid16(old_gid_t gid) |
| 125 | { |
OGAWA Hirofumi | 5a7b46b | 2006-04-20 06:41:39 +0900 | [diff] [blame] | 126 | long ret = sys_setfsgid(low2highgid(gid)); |
| 127 | /* avoid REGPARM breakage on x86: */ |
| 128 | prevent_tail_call(ret); |
| 129 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static int groups16_to_user(old_gid_t __user *grouplist, |
| 133 | struct group_info *group_info) |
| 134 | { |
| 135 | int i; |
| 136 | old_gid_t group; |
| 137 | |
| 138 | for (i = 0; i < group_info->ngroups; i++) { |
| 139 | group = high2lowgid(GROUP_AT(group_info, i)); |
| 140 | if (put_user(group, grouplist+i)) |
| 141 | return -EFAULT; |
| 142 | } |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static int groups16_from_user(struct group_info *group_info, |
| 148 | old_gid_t __user *grouplist) |
| 149 | { |
| 150 | int i; |
| 151 | old_gid_t group; |
| 152 | |
| 153 | for (i = 0; i < group_info->ngroups; i++) { |
| 154 | if (get_user(group, grouplist+i)) |
| 155 | return -EFAULT; |
| 156 | GROUP_AT(group_info, i) = low2highgid(group); |
| 157 | } |
| 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist) |
| 163 | { |
| 164 | int i = 0; |
| 165 | |
| 166 | if (gidsetsize < 0) |
| 167 | return -EINVAL; |
| 168 | |
| 169 | get_group_info(current->group_info); |
| 170 | i = current->group_info->ngroups; |
| 171 | if (gidsetsize) { |
| 172 | if (i > gidsetsize) { |
| 173 | i = -EINVAL; |
| 174 | goto out; |
| 175 | } |
| 176 | if (groups16_to_user(grouplist, current->group_info)) { |
| 177 | i = -EFAULT; |
| 178 | goto out; |
| 179 | } |
| 180 | } |
| 181 | out: |
| 182 | put_group_info(current->group_info); |
| 183 | return i; |
| 184 | } |
| 185 | |
| 186 | asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist) |
| 187 | { |
| 188 | struct group_info *group_info; |
| 189 | int retval; |
| 190 | |
| 191 | if (!capable(CAP_SETGID)) |
| 192 | return -EPERM; |
| 193 | if ((unsigned)gidsetsize > NGROUPS_MAX) |
| 194 | return -EINVAL; |
| 195 | |
| 196 | group_info = groups_alloc(gidsetsize); |
| 197 | if (!group_info) |
| 198 | return -ENOMEM; |
| 199 | retval = groups16_from_user(group_info, grouplist); |
| 200 | if (retval) { |
| 201 | put_group_info(group_info); |
| 202 | return retval; |
| 203 | } |
| 204 | |
| 205 | retval = set_current_groups(group_info); |
| 206 | put_group_info(group_info); |
| 207 | |
| 208 | return retval; |
| 209 | } |
| 210 | |
| 211 | asmlinkage long sys_getuid16(void) |
| 212 | { |
| 213 | return high2lowuid(current->uid); |
| 214 | } |
| 215 | |
| 216 | asmlinkage long sys_geteuid16(void) |
| 217 | { |
| 218 | return high2lowuid(current->euid); |
| 219 | } |
| 220 | |
| 221 | asmlinkage long sys_getgid16(void) |
| 222 | { |
| 223 | return high2lowgid(current->gid); |
| 224 | } |
| 225 | |
| 226 | asmlinkage long sys_getegid16(void) |
| 227 | { |
| 228 | return high2lowgid(current->egid); |
| 229 | } |