/* * Wrapper functions for 16bit uid back compatibility. All nicely tied * together in the faint hope we can take the out in five years time. */ #include <linux/mm.h> #include <linux/utsname.h> #include <linux/mman.h> #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/prctl.h> #include <linux/capability.h> #include <linux/init.h> #include <linux/highuid.h> #include <linux/security.h> #include <linux/syscalls.h> #include <asm/uaccess.h> asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group) { long ret = sys_chown(filename, low2highuid(user), low2highgid(group)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group) { long ret = sys_lchown(filename, low2highuid(user), low2highgid(group)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group) { long ret = sys_fchown(fd, low2highuid(user), low2highgid(group)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid) { long ret = sys_setregid(low2highgid(rgid), low2highgid(egid)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_setgid16(old_gid_t gid) { long ret = sys_setgid(low2highgid(gid)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid) { long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_setuid16(old_uid_t uid) { long ret = sys_setuid(low2highuid(uid)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid) { long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid), low2highuid(suid)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid) { int retval; if (!(retval = put_user(high2lowuid(current->uid), ruid)) && !(retval = put_user(high2lowuid(current->euid), euid))) retval = put_user(high2lowuid(current->suid), suid); return retval; } asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid) { long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid), low2highgid(sgid)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid) { int retval; if (!(retval = put_user(high2lowgid(current->gid), rgid)) && !(retval = put_user(high2lowgid(current->egid), egid))) retval = put_user(high2lowgid(current->sgid), sgid); return retval; } asmlinkage long sys_setfsuid16(old_uid_t uid) { long ret = sys_setfsuid(low2highuid(uid)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } asmlinkage long sys_setfsgid16(old_gid_t gid) { long ret = sys_setfsgid(low2highgid(gid)); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } static int groups16_to_user(old_gid_t __user *grouplist, struct group_info *group_info) { int i; old_gid_t group; for (i = 0; i < group_info->ngroups; i++) { group = high2lowgid(GROUP_AT(group_info, i)); if (put_user(group, grouplist+i)) return -EFAULT; } return 0; } static int groups16_from_user(struct group_info *group_info, old_gid_t __user *grouplist) { int i; old_gid_t group; for (i = 0; i < group_info->ngroups; i++) { if (get_user(group, grouplist+i)) return -EFAULT; GROUP_AT(group_info, i) = low2highgid(group); } return 0; } asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist) { int i = 0; if (gidsetsize < 0) return -EINVAL; get_group_info(current->group_info); i = current->group_info->ngroups; if (gidsetsize) { if (i > gidsetsize) { i = -EINVAL; goto out; } if (groups16_to_user(grouplist, current->group_info)) { i = -EFAULT; goto out; } } out: put_group_info(current->group_info); return i; } asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist) { struct group_info *group_info; int retval; if (!capable(CAP_SETGID)) return -EPERM; if ((unsigned)gidsetsize > NGROUPS_MAX) return -EINVAL; group_info = groups_alloc(gidsetsize); if (!group_info) return -ENOMEM; retval = groups16_from_user(group_info, grouplist); if (retval) { put_group_info(group_info); return retval; } retval = set_current_groups(group_info); put_group_info(group_info); return retval; } asmlinkage long sys_getuid16(void) { return high2lowuid(current->uid); } asmlinkage long sys_geteuid16(void) { return high2lowuid(current->euid); } asmlinkage long sys_getgid16(void) { return high2lowgid(current->gid); } asmlinkage long sys_getegid16(void) { return high2lowgid(current->egid); }