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- oh i never new thanks
- hey stop right there never share ur password
- ok ill never share my password thanks.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 - left)/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;}|
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