cregit-Linux how code gets into the kernel

Release 4.17 kernel/groups.c

Directory: kernel
// SPDX-License-Identifier: GPL-2.0
/*
 * Supplementary group IDs
 */
#include <linux/cred.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/security.h>
#include <linux/sort.h>
#include <linux/syscalls.h>
#include <linux/user_namespace.h>
#include <linux/vmalloc.h>
#include <linux/uaccess.h>


struct group_info *groups_alloc(int gidsetsize) { struct group_info *gi; unsigned int len; len = sizeof(struct group_info) + sizeof(kgid_t) * gidsetsize; gi = kmalloc(len, GFP_KERNEL_ACCOUNT|__GFP_NOWARN|__GFP_NORETRY); if (!gi) gi = __vmalloc(len, GFP_KERNEL_ACCOUNT, PAGE_KERNEL); if (!gi) return NULL; atomic_set(&gi->usage, 1); gi->ngroups = gidsetsize; return gi; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan90100.00%2100.00%
Total90100.00%2100.00%

EXPORT_SYMBOL(groups_alloc);
void groups_free(struct group_info *group_info) { kvfree(group_info); }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan15100.00%2100.00%
Total15100.00%2100.00%

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) { struct user_namespace *user_ns = current_user_ns(); int i; unsigned int count = group_info->ngroups; for (i = 0; i < count; i++) { gid_t gid; gid = from_kgid_munged(user_ns, group_info->gid[i]); if (put_user(gid, grouplist+i)) return -EFAULT; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan6272.09%266.67%
Eric W. Biedermann2427.91%133.33%
Total86100.00%3100.00%

/* 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) { struct user_namespace *user_ns = current_user_ns(); int i; unsigned int count = group_info->ngroups; for (i = 0; i < count; i++) { gid_t gid; kgid_t kgid; if (get_user(gid, grouplist+i)) return -EFAULT; kgid = make_kgid(user_ns, gid); if (!gid_valid(kgid)) return -EINVAL; group_info->gid[i] = kgid; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan6360.58%266.67%
Eric W. Biedermann4139.42%133.33%
Total104100.00%3100.00%


static int gid_cmp(const void *_a, const void *_b) { kgid_t a = *(kgid_t *)_a; kgid_t b = *(kgid_t *)_b; return gid_gt(a, b) - gid_lt(a, b); }

Contributors

PersonTokensPropCommitsCommitProp
Rasmus Villemoes3670.59%133.33%
Alexey Dobriyan1019.61%133.33%
Eric W. Biedermann59.80%133.33%
Total51100.00%3100.00%


void groups_sort(struct group_info *group_info) { sort(group_info->gid, group_info->ngroups, sizeof(*group_info->gid), gid_cmp, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Rasmus Villemoes2266.67%133.33%
Alexey Dobriyan1133.33%266.67%
Total33100.00%3100.00%

EXPORT_SYMBOL(groups_sort); /* a simple bsearch */
int groups_search(const struct group_info *group_info, kgid_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 (gid_gt(grp, group_info->gid[mid])) left = mid + 1; else if (gid_lt(grp, group_info->gid[mid])) right = mid; else return 1; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan9086.54%250.00%
Eric W. Biedermann98.65%125.00%
Jerome Marchand54.81%125.00%
Total104100.00%4100.00%

/** * 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 */
void set_groups(struct cred *new, struct group_info *group_info) { put_group_info(new->group_info); get_group_info(group_info); new->group_info = group_info; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan3296.97%150.00%
Wang YanQing13.03%150.00%
Total33100.00%2100.00%

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; new = prepare_creds(); if (!new) return -ENOMEM; set_groups(new, group_info); return commit_creds(new); }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan42100.00%1100.00%
Total42100.00%1100.00%

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; }
bool may_setgroups(void) { struct user_namespace *user_ns = current_user_ns(); return ns_capable(user_ns, CAP_SETGID) && userns_may_setgroups(user_ns); }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann28100.00%2100.00%
Total28100.00%2100.00%

/* * 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 (!may_setgroups()) 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; } groups_sort(group_info); 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(kgid_t grp) { const struct cred *cred = current_cred(); int retval = 1; if (!gid_eq(grp, cred->fsgid)) retval = groups_search(cred->group_info, grp); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan4287.50%150.00%
Eric W. Biedermann612.50%150.00%
Total48100.00%2100.00%

EXPORT_SYMBOL(in_group_p);
int in_egroup_p(kgid_t grp) { const struct cred *cred = current_cred(); int retval = 1; if (!gid_eq(grp, cred->egid)) retval = groups_search(cred->group_info, grp); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan4287.50%150.00%
Eric W. Biedermann612.50%150.00%
Total48100.00%2100.00%

EXPORT_SYMBOL(in_egroup_p);

Overall Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan74578.42%214.29%
Eric W. Biedermann12413.05%535.71%
Rasmus Villemoes616.42%17.14%
Thiago Rafael Becker101.05%17.14%
Jerome Marchand50.53%17.14%
Wang YanQing20.21%17.14%
Paul Gortmaker10.11%17.14%
Greg Kroah-Hartman10.11%17.14%
Linus Torvalds10.11%17.14%
Total950100.00%14100.00%
Directory: kernel
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