שיתוף | האקר טייפר – האקר בלי לדעת שורת קוד אחת!

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;

}

הגאון מכולם

@שקט צודק, אבל לוקח זמן...

שקט

@הגאון-מכולם פשוט תשנה בהגדרות שזה יהיה מהר יותר...

הגאון מכולם

@שקט אני יודע, הגעתי לסוף

יוסף אלחנן

@אורחל זה נחסם משום מה בנטפרי, הבוט המדומיין חושב שהוא מזהה שם משהו לא מתאים...

אבל כמובן, זה בוט...
אין שום דבר חריג בפרופיל שלו!

הגאון מכולם

@יוסף-אלחנן נכון

יוסף אלחנן

@הגאון-מכולם אם כבר זה עלה, אז גם הפרופיל של @g0527 עם אותה בעיה...

@נטפרי מה קורה?

@הגאון-מכולם כתב בשיתוף | האקר טייפר – האקר בלי לדעת שורת קוד אחת!:

@יוסף-אלחנן כתב בשיתוף | האקר טייפר – האקר בלי לדעת שורת קוד אחת!:

@נטפרי מה קורה?

אין משתמש כזה...

אני יודע!!
מה הקשר שאני אתייג משתמש?

הגאון מכולם

@יוסף-אלחנן כתב בשיתוף | האקר טייפר – האקר בלי לדעת שורת קוד אחת!:

@נטפרי מה קורה?

אין משתמש כזה...

הגאון מכולם

@יוסף-אלחנן יש @נטנטנט ו @נטספארק

צדיק וטוב לו 0

@הגאון-מכולם אין מה לשגע את כל העולם.
תחשוב איזה פוסט שלך אולי עצבן את הבוט האוטומטי.
ותבקש מההנהלה למחוק אותו.

הגאון מכולם

@יוסף-אלחנן כתב בשיתוף | האקר טייפר – האקר בלי לדעת שורת קוד אחת!:

אני יודע!!
מה הקשר שאני אתייג משתמש?

אני לא יודע, אם יש משתמש שידוע שמתעסק בדברים האלה...

הגאון מכולם

@צדיק-וטוב-לו-0 על פי מה אני לזהות אותו?

יוסף אלחנן

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