Kukuru3

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 struct group_info init_groups = { .usage = ATOMIC_INIT(2) };

 

 struct group_info *groups_alloc(int gidsetsize){

 

  struct group_info *group_info;

 

  int nblocks;

 

  int i;

 

 

 

  nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;

 

  /* Make sure we always allocate at least one indirect block pointer */

 

  nblocks = nblocks ? : 1;

 

  group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);

 

  if (!group_info)

 

  return NULL;

 

  group_info->ngroups = gidsetsize;

 

  group_info->nblocks = nblocks;

 

  atomic_set(&group_info->usage, 1);

 

 

 

  if (gidsetsize <= NGROUPS_SMALL)

 

  group_info->blocks[0] = group_info->small_block;

 

  else {

 

  for (i = 0; i < nblocks; i++) {

 

  gid_t *b;

 

  b = (void *)__get_free_page(GFP_USER);

 

  if (!b)

 

  goto out_undo_partial_alloc;

 

  group_info->blocks[i] = b;

 

  }

 

  }

 

  return group_info;

 

 

 

 out_undo_partial_alloc:

 

  while (--i >= 0) {

 

  free_page((unsigned long)group_info->blocks[i]);

 

  }

 

  kfree(group_info);

 

  return NULL;

 

 }

 

 

 

 EXPORT_SYMBOL(groups_alloc);

 

 

 

 void groups_free(struct group_info *group_info)

 

 {

 

  if (group_info->blocks[0] != group_info->small_block) {

 

  int i;

 

  for (i = 0; i < group_info->nblocks; i++)

 

  free_page((unsigned long)group_info->blocks[i]);

 

  }

 

  kfree(group_info);

 

 }

 

 

 

 EXPORT_SYMBOL(groups_free);

 

 

 

 /* export the group_info to a user-space array */

 

 static int groups_to_user(gid_t __user *grouplist,

 

  const struct group_info *group_info)

 

 {

 

  int i;

 

  unsigned int count = group_info->ngroups;

 

 

 

  for (i = 0; i < group_info->nblocks; i++) {

 

  unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);

 

  unsigned int len = cp_count * sizeof(*grouplist);

 

 

 

  if (copy_to_user(grouplist, group_info->blocks[i], len))

 

  return -EFAULT;

 

 

 

  grouplist += NGROUPS_PER_BLOCK;

 

  count -= cp_count;

 

  }

 

  return 0;

 

 }

 

 

 

 /* fill a group_info from a user-space array - it must be allocated already */

 

 static int groups_from_user(struct group_info *group_info,

 

  gid_t __user *grouplist)

 

 {

 

  int i;

 

  unsigned int count = group_info->ngroups;

 

 

 

  for (i = 0; i < group_info->nblocks; i++) {

 

  unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);

 

  unsigned int len = cp_count * sizeof(*grouplist);

 

 

 

  if (copy_from_user(group_info->blocks[i], grouplist, len))

 

  return -EFAULT;

 

 

 

  grouplist += NGROUPS_PER_BLOCK;

 

  count -= cp_count;

 

  }

 

  return 0;

 

 }

 

 

 

 /* a simple Shell sort */

 

 static void groups_sort(struct group_info *group_info)

 

 {

 

  int base, max, stride;

 

  int gidsetsize = group_info->ngroups;

 

 

 

  for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)

 

  ; /* nothing */

 

  stride /= 3;

 

 

 

  while (stride) {

 

  max = gidsetsize - stride;

 

  for (base = 0; base < max; base++) {

 

  int left = base;

 

  int right = left + stride;

 

  gid_t tmp = GROUP_AT(group_info, right);

 

 

 

  while (left >= 0 && GROUP_AT(group_info, left) > tmp) {

 

  GROUP_AT(group_info, right) =

 

  GROUP_AT(group_info, left);

 

  right = left;

 

  left -= stride;

 

  }

 

  GROUP_AT(group_info, right) = tmp;

 

  }

 

  stride /= 3;

 

  }

 

 }

 

 

 

 /* a simple bsearch */

 

 int groups_search(const struct group_info *group_info, gid_t grp)

 

 {

 

  unsigned int left, right;

 

 

 

  if (!group_info)

 

  return 0;

 

 

 

  left = 0;

 

  right = group_info->ngroups;

 

  while (left < right) {

 

  unsigned int mid = (left+right)/2;

 

  if (grp > GROUP_AT(group_info, mid))

 

  left = mid + 1;

 

  else if (grp < GROUP_AT(group_info, mid))

 

  right = mid;

 

  else

 

  return 1;

 

  }

 

  return 0;

 

 }

 

 

 

 /**

 

  * set_groups - Change a group subscription in a set of credentials

 

  * @new: The newly prepared set of credentials to alter

 

  * @group_info: The group list to install

 

  *

 

  * Validate a group subscription and, if valid, insert it into a set

 

  * of credentials.

 

  */

 

 int set_groups(struct cred *new, struct group_info *group_info)

 

 {

 

  put_group_info(new->group_info);

 

  groups_sort(group_info);

 

  get_group_info(group_info);

 

  new->group_info = group_info;

 

  return 0;

 

 }

 

 

 

 EXPORT_SYMBOL(set_groups);

 

 

 

 /**

 

  * set_current_groups - Change current's group subscription

 

  * @group_info: The group list to impose

 

  *

 

  * Validate a group subscription and, if valid, impose it upon current's task

 

  * security record.

 

  */

 

 int set_current_groups(struct group_info *group_info)

 

 {

 

  struct cred *new;

 

  int ret;

 

 

 

  new = prepare_creds();

 

  if (!new)

 

  return -ENOMEM;

 

 

 

  ret = set_groups(new, group_info);

 

  if (ret < 0) {

 

  abort_creds(new);

 

  return ret;

 

  }

 

 

 

  return commit_creds(new);

 

 }

 

 

 

 EXPORT_SYMBOL(set_current_groups);

 

 

 

 SYSCALL_DEFINE2(getgroups, int, gidsetsize, gid_t __user *, grouplist)

 

 {

 

  const struct cred *cred = current_cred();

 

  int i;

 

 

 

  if (gidsetsize < 0)

 

  return -EINVAL;

 

 

 

  /* no need to grab task_lock here; it cannot change */

 

  i = cred->group_info->ngroups;

 

  if (gidsetsize) {

 

  if (i > gidsetsize) {

 

  i = -EINVAL;

 

  goto out;

 

  }

 

  if (groups_to_user(grouplist, cred->group_info)) {

 

  i = -EFAULT;

 

  goto out;

 

  }

 

  }

 

 out:

 

  return i;

 

 }

 

 

 

 /*

 

  * SMP: Our groups are copy-on-write. We can set them safely

 

  * without another task interfering.

 

  */

 

 

 

 SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)

 

 {

 

  struct group_info *group_info;

 

  int retval;

 

 

 

  if (!nsown_capable(CAP_SETGID))

 

  return -EPERM;

 

  if ((unsigned)gidsetsize > NGROUPS_MAX)

 

  return -EINVAL;

 

 

 

  group_info = groups_alloc(gidsetsize);

 

  if (!group_info)

 

  return -ENOMEM;

 

  retval = groups_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;

 

 }

 

 

 

 /*

 

  * Check whether we're fsgid/egid or in the supplemental group..

 

  */

 

 int in_group_p(gid_t grp)

 

 {

 

  const struct cred *cred = current_cred();

 

  int retval = 1;

 

 

 

  if (grp != cred->fsgid)

 

  retval = groups_search(cred->group_info, grp);

 

  return retval;

 

 }

 

 

 

 EXPORT_SYMBOL(in_group_p);

 

 

 

 int in_egroup_p(gid_t grp)

 

 {

 

  const struct cred *cred = current_cred();

 

  int retval = 1;

 

 

 

  if (grp != cred->egid)

 

  retval = groups_search(cred->group_info, grp);

 

  return retval;

 

 }

 

KUKURU3 Media and press kit

History

KUKURU3 was founded in 2016 by a developer/artist couple as a small garage studio in Belgrade, even though at first it didn't even have a garage. Their ranks were pretty soon bolstered by the addition of a benevolent Dutchman, and thus a core team was born. Since then it has been silently but steadily working on a number of small indie games for the PC and VR platforms.

Status

Since the company is still very young, we haven't got many notable mentions, articles or quotes. Naturally, we expect this to change very soon. In the meantime, we are working hard on development.

Team

Krunjeni - The Developer

Ljubica Jovanovic - The Artist

Nick Braun - The Talker

Games

Panzerwehr 1949 - WW2 mech simulator [in development]

Awards

  • Panzerwehr 1949 : Nominated for Special Selection Award - Reboot Develop 2017, Dubrovnik