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- /* auditsc.c -- System-call auditing support
- * Handles all system-call specific auditing features.
- *
- * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
- * Copyright 2005 Hewlett-Packard Development Company, L.P.
- * Copyright (C) 2005, 2006 IBM Corporation
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Written by Rickard E. (Rik) Faith <faith@redhat.com>
- *
- * Many of the ideas implemented here are from Stephen C. Tweedie,
- * especially the idea of avoiding a copy by using getname.
- *
- * The method for actual interception of syscall entry and exit (not in
- * this file -- see entry.S) is based on a GPL'd patch written by
- * okir@suse.de and Copyright 2003 SuSE Linux AG.
- *
- * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
- * 2006.
- *
- * The support of additional filter rules compares (>, <, >=, <=) was
- * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
- *
- * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
- * filesystem information.
- *
- * Subject and object context labeling support added by <danjones@us.ibm.com>
- * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/init.h>
- #include <asm/types.h>
- #include <linux/atomic.h>
- #include <linux/fs.h>
- #include <linux/namei.h>
- #include <linux/mm.h>
- #include <linux/export.h>
- #include <linux/slab.h>
- #include <linux/mount.h>
- #include <linux/socket.h>
- #include <linux/mqueue.h>
- #include <linux/audit.h>
- #include <linux/personality.h>
- #include <linux/time.h>
- #include <linux/netlink.h>
- #include <linux/compiler.h>
- #include <asm/unistd.h>
- #include <linux/security.h>
- #include <linux/list.h>
- #include <linux/binfmts.h>
- #include <linux/highmem.h>
- #include <linux/syscalls.h>
- #include <asm/syscall.h>
- #include <linux/capability.h>
- #include <linux/fs_struct.h>
- #include <linux/compat.h>
- #include <linux/ctype.h>
- #include <linux/string.h>
- #include <linux/uaccess.h>
- #include <linux/fsnotify_backend.h>
- #include <uapi/linux/limits.h>
- #include "audit.h"
- /* flags stating the success for a syscall */
- #define AUDITSC_INVALID 0
- #define AUDITSC_SUCCESS 1
- #define AUDITSC_FAILURE 2
- /* no execve audit message should be longer than this (userspace limits),
- * see the note near the top of audit_log_execve_info() about this value */
- #define MAX_EXECVE_AUDIT_LEN 7500
- /* max length to print of cmdline/proctitle value during audit */
- #define MAX_PROCTITLE_AUDIT_LEN 128
- /* number of audit rules */
- int audit_n_rules;
- /* determines whether we collect data for signals sent */
- int audit_signals;
- struct audit_aux_data {
- struct audit_aux_data *next;
- int type;
- };
- #define AUDIT_AUX_IPCPERM 0
- /* Number of target pids per aux struct. */
- #define AUDIT_AUX_PIDS 16
- struct audit_aux_data_pids {
- struct audit_aux_data d;
- pid_t target_pid[AUDIT_AUX_PIDS];
- kuid_t target_auid[AUDIT_AUX_PIDS];
- kuid_t target_uid[AUDIT_AUX_PIDS];
- unsigned int target_sessionid[AUDIT_AUX_PIDS];
- u32 target_sid[AUDIT_AUX_PIDS];
- char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
- int pid_count;
- };
- struct audit_aux_data_bprm_fcaps {
- struct audit_aux_data d;
- struct audit_cap_data fcap;
- unsigned int fcap_ver;
- struct audit_cap_data old_pcap;
- struct audit_cap_data new_pcap;
- };
- struct audit_tree_refs {
- struct audit_tree_refs *next;
- struct audit_chunk *c[31];
- };
- static int audit_match_perm(struct audit_context *ctx, int mask)
- {
- unsigned n;
- if (unlikely(!ctx))
- return 0;
- n = ctx->major;
- switch (audit_classify_syscall(ctx->arch, n)) {
- case 0: /* native */
- if ((mask & AUDIT_PERM_WRITE) &&
- audit_match_class(AUDIT_CLASS_WRITE, n))
- return 1;
- if ((mask & AUDIT_PERM_READ) &&
- audit_match_class(AUDIT_CLASS_READ, n))
- return 1;
- if ((mask & AUDIT_PERM_ATTR) &&
- audit_match_class(AUDIT_CLASS_CHATTR, n))
- return 1;
- return 0;
- case 1: /* 32bit on biarch */
- if ((mask & AUDIT_PERM_WRITE) &&
- audit_match_class(AUDIT_CLASS_WRITE_32, n))
- return 1;
- if ((mask & AUDIT_PERM_READ) &&
- audit_match_class(AUDIT_CLASS_READ_32, n))
- return 1;
- if ((mask & AUDIT_PERM_ATTR) &&
- audit_match_class(AUDIT_CLASS_CHATTR_32, n))
- return 1;
- return 0;
- case 2: /* open */
- return mask & ACC_MODE(ctx->argv[1]);
- case 3: /* openat */
- return mask & ACC_MODE(ctx->argv[2]);
- case 4: /* socketcall */
- return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
- case 5: /* execve */
- return mask & AUDIT_PERM_EXEC;
- default:
- return 0;
- }
- }
- static int audit_match_filetype(struct audit_context *ctx, int val)
- {
- struct audit_names *n;
- umode_t mode = (umode_t)val;
- if (unlikely(!ctx))
- return 0;
- list_for_each_entry(n, &ctx->names_list, list) {
- if ((n->ino != AUDIT_INO_UNSET) &&
- ((n->mode & S_IFMT) == mode))
- return 1;
- }
- return 0;
- }
- /*
- * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
- * ->first_trees points to its beginning, ->trees - to the current end of data.
- * ->tree_count is the number of free entries in array pointed to by ->trees.
- * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
- * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
- * it's going to remain 1-element for almost any setup) until we free context itself.
- * References in it _are_ dropped - at the same time we free/drop aux stuff.
- */
- #ifdef CONFIG_AUDIT_TREE
- static void audit_set_auditable(struct audit_context *ctx)
- {
- if (!ctx->prio) {
- ctx->prio = 1;
- ctx->current_state = AUDIT_RECORD_CONTEXT;
- }
- }
- static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
- {
- struct audit_tree_refs *p = ctx->trees;
- int left = ctx->tree_count;
- if (likely(left)) {
- p->c[--left] = chunk;
- ctx->tree_count = left;
- return 1;
- }
- if (!p)
- return 0;
- p = p->next;
- if (p) {
- p->c[30] = chunk;
- ctx->trees = p;
- ctx->tree_count = 30;
- return 1;
- }
- return 0;
- }
- static int grow_tree_refs(struct audit_context *ctx)
- {
- struct audit_tree_refs *p = ctx->trees;
- ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
- if (!ctx->trees) {
- ctx->trees = p;
- return 0;
- }
- if (p)
- p->next = ctx->trees;
- else
- ctx->first_trees = ctx->trees;
- ctx->tree_count = 31;
- return 1;
- }
- #endif
- static void unroll_tree_refs(struct audit_context *ctx,
- struct audit_tree_refs *p, int count)
- {
- #ifdef CONFIG_AUDIT_TREE
- struct audit_tree_refs *q;
- int n;
- if (!p) {
- /* we started with empty chain */
- p = ctx->first_trees;
- count = 31;
- /* if the very first allocation has failed, nothing to do */
- if (!p)
- return;
- }
- n = count;
- for (q = p; q != ctx->trees; q = q->next, n = 31) {
- while (n--) {
- audit_put_chunk(q->c[n]);
- q->c[n] = NULL;
- }
- }
- while (n-- > ctx->tree_count) {
- audit_put_chunk(q->c[n]);
- q->c[n] = NULL;
- }
- ctx->trees = p;
- ctx->tree_count = count;
- #endif
- }
- static void free_tree_refs(struct audit_context *ctx)
- {
- struct audit_tree_refs *p, *q;
- for (p = ctx->first_trees; p; p = q) {
- q = p->next;
- kfree(p);
- }
- }
- static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
- {
- #ifdef CONFIG_AUDIT_TREE
- struct audit_tree_refs *p;
- int n;
- if (!tree)
- return 0;
- /* full ones */
- for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
- for (n = 0; n < 31; n++)
- if (audit_tree_match(p->c[n], tree))
- return 1;
- }
- /* partial */
- if (p) {
- for (n = ctx->tree_count; n < 31; n++)
- if (audit_tree_match(p->c[n], tree))
- return 1;
- }
- #endif
- return 0;
- }
- static int audit_compare_uid(kuid_t uid,
- struct audit_names *name,
- struct audit_field *f,
- struct audit_context *ctx)
- {
- struct audit_names *n;
- int rc;
-
- if (name) {
- rc = audit_uid_comparator(uid, f->op, name->uid);
- if (rc)
- return rc;
- }
-
- if (ctx) {
- list_for_each_entry(n, &ctx->names_list, list) {
- rc = audit_uid_comparator(uid, f->op, n->uid);
- if (rc)
- return rc;
- }
- }
- return 0;
- }
- static int audit_compare_gid(kgid_t gid,
- struct audit_names *name,
- struct audit_field *f,
- struct audit_context *ctx)
- {
- struct audit_names *n;
- int rc;
-
- if (name) {
- rc = audit_gid_comparator(gid, f->op, name->gid);
- if (rc)
- return rc;
- }
-
- if (ctx) {
- list_for_each_entry(n, &ctx->names_list, list) {
- rc = audit_gid_comparator(gid, f->op, n->gid);
- if (rc)
- return rc;
- }
- }
- return 0;
- }
- static int audit_field_compare(struct task_struct *tsk,
- const struct cred *cred,
- struct audit_field *f,
- struct audit_context *ctx,
- struct audit_names *name)
- {
- switch (f->val) {
- /* process to file object comparisons */
- case AUDIT_COMPARE_UID_TO_OBJ_UID:
- return audit_compare_uid(cred->uid, name, f, ctx);
- case AUDIT_COMPARE_GID_TO_OBJ_GID:
- return audit_compare_gid(cred->gid, name, f, ctx);
- case AUDIT_COMPARE_EUID_TO_OBJ_UID:
- return audit_compare_uid(cred->euid, name, f, ctx);
- case AUDIT_COMPARE_EGID_TO_OBJ_GID:
- return audit_compare_gid(cred->egid, name, f, ctx);
- case AUDIT_COMPARE_AUID_TO_OBJ_UID:
- return audit_compare_uid(tsk->loginuid, name, f, ctx);
- case AUDIT_COMPARE_SUID_TO_OBJ_UID:
- return audit_compare_uid(cred->suid, name, f, ctx);
- case AUDIT_COMPARE_SGID_TO_OBJ_GID:
- return audit_compare_gid(cred->sgid, name, f, ctx);
- case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
- return audit_compare_uid(cred->fsuid, name, f, ctx);
- case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
- return audit_compare_gid(cred->fsgid, name, f, ctx);
- /* uid comparisons */
- case AUDIT_COMPARE_UID_TO_AUID:
- return audit_uid_comparator(cred->uid, f->op, tsk->loginuid);
- case AUDIT_COMPARE_UID_TO_EUID:
- return audit_uid_comparator(cred->uid, f->op, cred->euid);
- case AUDIT_COMPARE_UID_TO_SUID:
- return audit_uid_comparator(cred->uid, f->op, cred->suid);
- case AUDIT_COMPARE_UID_TO_FSUID:
- return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
- /* auid comparisons */
- case AUDIT_COMPARE_AUID_TO_EUID:
- return audit_uid_comparator(tsk->loginuid, f->op, cred->euid);
- case AUDIT_COMPARE_AUID_TO_SUID:
- return audit_uid_comparator(tsk->loginuid, f->op, cred->suid);
- case AUDIT_COMPARE_AUID_TO_FSUID:
- return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid);
- /* euid comparisons */
- case AUDIT_COMPARE_EUID_TO_SUID:
- return audit_uid_comparator(cred->euid, f->op, cred->suid);
- case AUDIT_COMPARE_EUID_TO_FSUID:
- return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
- /* suid comparisons */
- case AUDIT_COMPARE_SUID_TO_FSUID:
- return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
- /* gid comparisons */
- case AUDIT_COMPARE_GID_TO_EGID:
- return audit_gid_comparator(cred->gid, f->op, cred->egid);
- case AUDIT_COMPARE_GID_TO_SGID:
- return audit_gid_comparator(cred->gid, f->op, cred->sgid);
- case AUDIT_COMPARE_GID_TO_FSGID:
- return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
- /* egid comparisons */
- case AUDIT_COMPARE_EGID_TO_SGID:
- return audit_gid_comparator(cred->egid, f->op, cred->sgid);
- case AUDIT_COMPARE_EGID_TO_FSGID:
- return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
- /* sgid comparison */
- case AUDIT_COMPARE_SGID_TO_FSGID:
- return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
- default:
- WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
- return 0;
- }
- return 0;
- }
- /* Determine if any context name data matches a rule's watch data */
- /* Compare a task_struct with an audit_rule. Return 1 on match, 0
- * otherwise.
- *
- * If task_creation is true, this is an explicit indication that we are
- * filtering a task rule at task creation time. This and tsk == current are
- * the only situations where tsk->cred may be accessed without an rcu read lock.
- */
- static int audit_filter_rules(struct task_struct *tsk,
- struct audit_krule *rule,
- struct audit_context *ctx,
- struct audit_names *name,
- enum audit_state *state,
- bool task_creation)
- {
- const struct cred *cred;
- int i, need_sid = 1;
- u32 sid;
- unsigned int sessionid;
- cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
- for (i = 0; i < rule->field_count; i++) {
- struct audit_field *f = &rule->fields[i];
- struct audit_names *n;
- int result = 0;
- pid_t pid;
- switch (f->type) {
- case AUDIT_PID:
- pid = task_tgid_nr(tsk);
- result = audit_comparator(pid, f->op, f->val);
- break;
- case AUDIT_PPID:
- if (ctx) {
- if (!ctx->ppid)
- ctx->ppid = task_ppid_nr(tsk);
- result = audit_comparator(ctx->ppid, f->op, f->val);
- }
- break;
- case AUDIT_EXE:
- result = audit_exe_compare(tsk, rule->exe);
- if (f->op == Audit_not_equal)
- result = !result;
- break;
- case AUDIT_UID:
- result = audit_uid_comparator(cred->uid, f->op, f->uid);
- break;
- case AUDIT_EUID:
- result = audit_uid_comparator(cred->euid, f->op, f->uid);
- break;
- case AUDIT_SUID:
- result = audit_uid_comparator(cred->suid, f->op, f->uid);
- break;
- case AUDIT_FSUID:
- result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
- break;
- case AUDIT_GID:
- result = audit_gid_comparator(cred->gid, f->op, f->gid);
- if (f->op == Audit_equal) {
- if (!result)
- result = in_group_p(f->gid);
- } else if (f->op == Audit_not_equal) {
- if (result)
- result = !in_group_p(f->gid);
- }
- break;
- case AUDIT_EGID:
- result = audit_gid_comparator(cred->egid, f->op, f->gid);
- if (f->op == Audit_equal) {
- if (!result)
- result = in_egroup_p(f->gid);
- } else if (f->op == Audit_not_equal) {
- if (result)
- result = !in_egroup_p(f->gid);
- }
- break;
- case AUDIT_SGID:
- result = audit_gid_comparator(cred->sgid, f->op, f->gid);
- break;
- case AUDIT_FSGID:
- result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
- break;
- case AUDIT_SESSIONID:
- sessionid = audit_get_sessionid(current);
- result = audit_comparator(sessionid, f->op, f->val);
- break;
- case AUDIT_PERS:
- result = audit_comparator(tsk->personality, f->op, f->val);
- break;
- case AUDIT_ARCH:
- if (ctx)
- result = audit_comparator(ctx->arch, f->op, f->val);
- break;
- case AUDIT_EXIT:
- if (ctx && ctx->return_valid)
- result = audit_comparator(ctx->return_code, f->op, f->val);
- break;
- case AUDIT_SUCCESS:
- if (ctx && ctx->return_valid) {
- if (f->val)
- result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
- else
- result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
- }
- break;
- case AUDIT_DEVMAJOR:
- if (name) {
- if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
- audit_comparator(MAJOR(name->rdev), f->op, f->val))
- ++result;
- } else if (ctx) {
- list_for_each_entry(n, &ctx->names_list, list) {
- if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
- audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
- ++result;
- break;
- }
- }
- }
- break;
- case AUDIT_DEVMINOR:
- if (name) {
- if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
- audit_comparator(MINOR(name->rdev), f->op, f->val))
- ++result;
- } else if (ctx) {
- list_for_each_entry(n, &ctx->names_list, list) {
- if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
- audit_comparator(MINOR(n->rdev), f->op, f->val)) {
- ++result;
- break;
- }
- }
- }
- break;
- case AUDIT_INODE:
- if (name)
- result = audit_comparator(name->ino, f->op, f->val);
- else if (ctx) {
- list_for_each_entry(n, &ctx->names_list, list) {
- if (audit_comparator(n->ino, f->op, f->val)) {
- ++result;
- break;
- }
- }
- }
- break;
- case AUDIT_OBJ_UID:
- if (name) {
- result = audit_uid_comparator(name->uid, f->op, f->uid);
- } else if (ctx) {
- list_for_each_entry(n, &ctx->names_list, list) {
- if (audit_uid_comparator(n->uid, f->op, f->uid)) {
- ++result;
- break;
- }
- }
- }
- break;
- case AUDIT_OBJ_GID:
- if (name) {
- result = audit_gid_comparator(name->gid, f->op, f->gid);
- } else if (ctx) {
- list_for_each_entry(n, &ctx->names_list, list) {
- if (audit_gid_comparator(n->gid, f->op, f->gid)) {
- ++result;
- break;
- }
- }
- }
- break;
- case AUDIT_WATCH:
- if (name)
- result = audit_watch_compare(rule->watch, name->ino, name->dev);
- break;
- case AUDIT_DIR:
- if (ctx)
- result = match_tree_refs(ctx, rule->tree);
- break;
- case AUDIT_LOGINUID:
- result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
- break;
- case AUDIT_LOGINUID_SET:
- result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
- break;
- case AUDIT_SUBJ_USER:
- case AUDIT_SUBJ_ROLE:
- case AUDIT_SUBJ_TYPE:
- case AUDIT_SUBJ_SEN:
- case AUDIT_SUBJ_CLR:
- /* NOTE: this may return negative values indicating
- a temporary error. We simply treat this as a
- match for now to avoid losing information that
- may be wanted. An error message will also be
- logged upon error */
- if (f->lsm_rule) {
- if (need_sid) {
- security_task_getsecid(tsk, &sid);
- need_sid = 0;
- }
- result = security_audit_rule_match(sid, f->type,
- f->op,
- f->lsm_rule,
- ctx);
- }
- break;
- case AUDIT_OBJ_USER:
- case AUDIT_OBJ_ROLE:
- case AUDIT_OBJ_TYPE:
- case AUDIT_OBJ_LEV_LOW:
- case AUDIT_OBJ_LEV_HIGH:
- /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
- also applies here */
- if (f->lsm_rule) {
- /* Find files that match */
- if (name) {
- result = security_audit_rule_match(
- name->osid, f->type, f->op,
- f->lsm_rule, ctx);
- } else if (ctx) {
- list_for_each_entry(n, &ctx->names_list, list) {
- if (security_audit_rule_match(n->osid, f->type,
- f->op, f->lsm_rule,
- ctx)) {
- ++result;
- break;
- }
- }
- }
- /* Find ipc objects that match */
- if (!ctx || ctx->type != AUDIT_IPC)
- break;
- if (security_audit_rule_match(ctx->ipc.osid,
- f->type, f->op,
- f->lsm_rule, ctx))
- ++result;
- }
- break;
- case AUDIT_ARG0:
- case AUDIT_ARG1:
- case AUDIT_ARG2:
- case AUDIT_ARG3:
- if (ctx)
- result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
- break;
- case AUDIT_FILTERKEY:
- /* ignore this field for filtering */
- result = 1;
- break;
- case AUDIT_PERM:
- result = audit_match_perm(ctx, f->val);
- break;
- case AUDIT_FILETYPE:
- result = audit_match_filetype(ctx, f->val);
- break;
- case AUDIT_FIELD_COMPARE:
- result = audit_field_compare(tsk, cred, f, ctx, name);
- break;
- }
- if (!result)
- return 0;
- }
- if (ctx) {
- if (rule->prio <= ctx->prio)
- return 0;
- if (rule->filterkey) {
- kfree(ctx->filterkey);
- ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
- }
- ctx->prio = rule->prio;
- }
- switch (rule->action) {
- case AUDIT_NEVER:
- *state = AUDIT_DISABLED;
- break;
- case AUDIT_ALWAYS:
- *state = AUDIT_RECORD_CONTEXT;
- break;
- }
- return 1;
- }
- /* At process creation time, we can determine if system-call auditing is
- * completely disabled for this task. Since we only have the task
- * structure at this point, we can only check uid and gid.
- */
- static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
- {
- struct audit_entry *e;
- enum audit_state state;
- rcu_read_lock();
- list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
- if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
- &state, true)) {
- if (state == AUDIT_RECORD_CONTEXT)
- *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
- rcu_read_unlock();
- return state;
- }
- }
- rcu_read_unlock();
- return AUDIT_BUILD_CONTEXT;
- }
- static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
- {
- int word, bit;
- if (val > 0xffffffff)
- return false;
- word = AUDIT_WORD(val);
- if (word >= AUDIT_BITMASK_SIZE)
- return false;
- bit = AUDIT_BIT(val);
- return rule->mask[word] & bit;
- }
- /* At syscall entry and exit time, this filter is called if the
- * audit_state is not low enough that auditing cannot take place, but is
- * also not high enough that we already know we have to write an audit
- * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
- */
- static enum audit_state audit_filter_syscall(struct task_struct *tsk,
- struct audit_context *ctx,
- struct list_head *list)
- {
- struct audit_entry *e;
- enum audit_state state;
- if (auditd_test_task(tsk))
- return AUDIT_DISABLED;
- rcu_read_lock();
- if (!list_empty(list)) {
- list_for_each_entry_rcu(e, list, list) {
- if (audit_in_mask(&e->rule, ctx->major) &&
- audit_filter_rules(tsk, &e->rule, ctx, NULL,
- &state, false)) {
- rcu_read_unlock();
- ctx->current_state = state;
- return state;
- }
- }
- }
- rcu_read_unlock();
- return AUDIT_BUILD_CONTEXT;
- }
- /*
- * Given an audit_name check the inode hash table to see if they match.
- * Called holding the rcu read lock to protect the use of audit_inode_hash
- */
- static int audit_filter_inode_name(struct task_struct *tsk,
- struct audit_names *n,
- struct audit_context *ctx) {
- int h = audit_hash_ino((u32)n->ino);
- struct list_head *list = &audit_inode_hash[h];
- struct audit_entry *e;
- enum audit_state state;
- if (list_empty(list))
- return 0;
- list_for_each_entry_rcu(e, list, list) {
- if (audit_in_mask(&e->rule, ctx->major) &&
- audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
- ctx->current_state = state;
- return 1;
- }
- }
- return 0;
- }
- /* At syscall exit time, this filter is called if any audit_names have been
- * collected during syscall processing. We only check rules in sublists at hash
- * buckets applicable to the inode numbers in audit_names.
- * Regarding audit_state, same rules apply as for audit_filter_syscall().
- */
- void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
- {
- struct audit_names *n;
- if (auditd_test_task(tsk))
- return;
- rcu_read_lock();
- list_for_each_entry(n, &ctx->names_list, list) {
- if (audit_filter_inode_name(tsk, n, ctx))
- break;
- }
- rcu_read_unlock();
- }
- /* Transfer the audit context pointer to the caller, clearing it in the tsk's struct */
- static inline struct audit_context *audit_take_context(struct task_struct *tsk,
- int return_valid,
- long return_code)
- {
- struct audit_context *context = tsk->audit_context;
- if (!context)
- return NULL;
- context->return_valid = return_valid;
- /*
- * we need to fix up the return code in the audit logs if the actual
- * return codes are later going to be fixed up by the arch specific
- * signal handlers
- *
- * This is actually a test for:
- * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
- * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
- *
- * but is faster than a bunch of ||
- */
- if (unlikely(return_code <= -ERESTARTSYS) &&
- (return_code >= -ERESTART_RESTARTBLOCK) &&
- (return_code != -ENOIOCTLCMD))
- context->return_code = -EINTR;
- else
- context->return_code = return_code;
- if (context->in_syscall && !context->dummy) {
- audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
- audit_filter_inodes(tsk, context);
- }
- tsk->audit_context = NULL;
- return context;
- }
- static inline void audit_proctitle_free(struct audit_context *context)
- {
- kfree(context->proctitle.value);
- context->proctitle.value = NULL;
- context->proctitle.len = 0;
- }
- static inline void audit_free_names(struct audit_context *context)
- {
- struct audit_names *n, *next;
- list_for_each_entry_safe(n, next, &context->names_list, list) {
- list_del(&n->list);
- if (n->name)
- putname(n->name);
- if (n->should_free)
- kfree(n);
- }
- context->name_count = 0;
- path_put(&context->pwd);
- context->pwd.dentry = NULL;
- context->pwd.mnt = NULL;
- }
- static inline void audit_free_aux(struct audit_context *context)
- {
- struct audit_aux_data *aux;
- while ((aux = context->aux)) {
- context->aux = aux->next;
- kfree(aux);
- }
- while ((aux = context->aux_pids)) {
- context->aux_pids = aux->next;
- kfree(aux);
- }
- }
- static inline struct audit_context *audit_alloc_context(enum audit_state state)
- {
- struct audit_context *context;
- context = kzalloc(sizeof(*context), GFP_KERNEL);
- if (!context)
- return NULL;
- context->state = state;
- context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
- INIT_LIST_HEAD(&context->killed_trees);
- INIT_LIST_HEAD(&context->names_list);
- return context;
- }
- /**
- * audit_alloc - allocate an audit context block for a task
- * @tsk: task
- *
- * Filter on the task information and allocate a per-task audit context
- * if necessary. Doing so turns on system call auditing for the
- * specified task. This is called from copy_process, so no lock is
- * needed.
- */
- int audit_alloc(struct task_struct *tsk)
- {
- struct audit_context *context;
- enum audit_state state;
- char *key = NULL;
- if (likely(!audit_ever_enabled))
- return 0; /* Return if not auditing. */
- state = audit_filter_task(tsk, &key);
- if (state == AUDIT_DISABLED) {
- clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
- return 0;
- }
- if (!(context = audit_alloc_context(state))) {
- kfree(key);
- audit_log_lost("out of memory in audit_alloc");
- return -ENOMEM;
- }
- context->filterkey = key;
- tsk->audit_context = context;
- set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
- return 0;
- }
- static inline void audit_free_context(struct audit_context *context)
- {
- audit_free_names(context);
- unroll_tree_refs(context, NULL, 0);
- free_tree_refs(context);
- audit_free_aux(context);
- kfree(context->filterkey);
- kfree(context->sockaddr);
- audit_proctitle_free(context);
- kfree(context);
- }
- static int audit_log_pid_context(struct audit_context *context, pid_t pid,
- kuid_t auid, kuid_t uid, unsigned int sessionid,
- u32 sid, char *comm)
- {
- struct audit_buffer *ab;
- char *ctx = NULL;
- u32 len;
- int rc = 0;
- ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
- if (!ab)
- return rc;
- audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
- from_kuid(&init_user_ns, auid),
- from_kuid(&init_user_ns, uid), sessionid);
- if (sid) {
- if (security_secid_to_secctx(sid, &ctx, &len)) {
- audit_log_format(ab, " obj=(none)");
- rc = 1;
- } else {
- audit_log_format(ab, " obj=%s", ctx);
- security_release_secctx(ctx, len);
- }
- }
- audit_log_format(ab, " ocomm=");
- audit_log_untrustedstring(ab, comm);
- audit_log_end(ab);
- return rc;
- }
- static void audit_log_execve_info(struct audit_context *context,
- struct audit_buffer **ab)
- {
- long len_max;
- long len_rem;
- long len_full;
- long len_buf;
- long len_abuf = 0;
- long len_tmp;
- bool require_data;
- bool encode;
- unsigned int iter;
- unsigned int arg;
- char *buf_head;
- char *buf;
- const char __user *p = (const char __user *)current->mm->arg_start;
- /* NOTE: this buffer needs to be large enough to hold all the non-arg
- * data we put in the audit record for this argument (see the
- * code below) ... at this point in time 96 is plenty */
- char abuf[96];
- /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the
- * current value of 7500 is not as important as the fact that it
- * is less than 8k, a setting of 7500 gives us plenty of wiggle
- * room if we go over a little bit in the logging below */
- WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500);
- len_max = MAX_EXECVE_AUDIT_LEN;
- /* scratch buffer to hold the userspace args */
- buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
- if (!buf_head) {
- audit_panic("out of memory for argv string");
- return;
- }
- buf = buf_head;
- audit_log_format(*ab, "argc=%d", context->execve.argc);
- len_rem = len_max;
- len_buf = 0;
- len_full = 0;
- require_data = true;
- encode = false;
- iter = 0;
- arg = 0;
- do {
- /* NOTE: we don't ever want to trust this value for anything
- * serious, but the audit record format insists we
- * provide an argument length for really long arguments,
- * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but
- * to use strncpy_from_user() to obtain this value for
- * recording in the log, although we don't use it
- * anywhere here to avoid a double-fetch problem */
- if (len_full == 0)
- len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1;
- /* read more data from userspace */
- if (require_data) {
- /* can we make more room in the buffer? */
- if (buf != buf_head) {
- memmove(buf_head, buf, len_buf);
- buf = buf_head;
- }
- /* fetch as much as we can of the argument */
- len_tmp = strncpy_from_user(&buf_head[len_buf], p,
- len_max - len_buf);
- if (len_tmp == -EFAULT) {
- /* unable to copy from userspace */
- send_sig(SIGKILL, current, 0);
- goto out;
- } else if (len_tmp == (len_max - len_buf)) {
- /* buffer is not large enough */
- require_data = true;
- /* NOTE: if we are going to span multiple
- * buffers force the encoding so we stand
- * a chance at a sane len_full value and
- * consistent record encoding */
- encode = true;
- len_full = len_full * 2;
- p += len_tmp;
- } else {
- require_data = false;
- if (!encode)
- encode = audit_string_contains_control(
- buf, len_tmp);
- /* try to use a trusted value for len_full */
- if (len_full < len_max)
- len_full = (encode ?
- len_tmp * 2 : len_tmp);
- p += len_tmp + 1;
- }
- len_buf += len_tmp;
- buf_head[len_buf] = '\0';
- /* length of the buffer in the audit record? */
- len_abuf = (encode ? len_buf * 2 : len_buf + 2);
- }
- /* write as much as we can to the audit log */
- if (len_buf >= 0) {
- /* NOTE: some magic numbers here - basically if we
- * can't fit a reasonable amount of data into the
- * existing audit buffer, flush it and start with
- * a new buffer */
- if ((sizeof(abuf) + 8) > len_rem) {
- len_rem = len_max;
- audit_log_end(*ab);
- *ab = audit_log_start(context,
- GFP_KERNEL, AUDIT_EXECVE);
- if (!*ab)
- goto out;
- }
- /* create the non-arg portion of the arg record */
- len_tmp = 0;
- if (require_data || (iter > 0) ||
- ((len_abuf + sizeof(abuf)) > len_rem)) {
- if (iter == 0) {
- len_tmp += snprintf(&abuf[len_tmp],
- sizeof(abuf) - len_tmp,
- " a%d_len=%lu",
- arg, len_full);
- }
- len_tmp += snprintf(&abuf[len_tmp],
- sizeof(abuf) - len_tmp,
- " a%d[%d]=", arg, iter++);
- } else
- len_tmp += snprintf(&abuf[len_tmp],
- sizeof(abuf) - len_tmp,
- " a%d=", arg);
- WARN_ON(len_tmp >= sizeof(abuf));
- abuf[sizeof(abuf) - 1] = '\0';
- /* log the arg in the audit record */
- audit_log_format(*ab, "%s", abuf);
- len_rem -= len_tmp;
- len_tmp = len_buf;
- if (encode) {
- if (len_abuf > len_rem)
- len_tmp = len_rem / 2; /* encoding */
- audit_log_n_hex(*ab, buf, len_tmp);
- len_rem -= len_tmp * 2;
- len_abuf -= len_tmp * 2;
- } else {
- if (len_abuf > len_rem)
- len_tmp = len_rem - 2; /* quotes */
- audit_log_n_string(*ab, buf, len_tmp);
- len_rem -= len_tmp + 2;
- /* don't subtract the "2" because we still need
- * to add quotes to the remaining string */
- len_abuf -= len_tmp;
- }
- len_buf -= len_tmp;
- buf += len_tmp;
- }
- /* ready to move to the next argument? */
- if ((len_buf == 0) && !require_data) {
- arg++;
- iter = 0;
- len_full = 0;
- require_data = true;
- encode = false;
- }
- } while (arg < context->execve.argc);
- /* NOTE: the caller handles the final audit_log_end() call */
- out:
- kfree(buf_head);
- }
- static void show_special(struct audit_context *context, int *call_panic)
- {
- struct audit_buffer *ab;
- int i;
- ab = audit_log_start(context, GFP_KERNEL, context->type);
- if (!ab)
- return;
- switch (context->type) {
- case AUDIT_SOCKETCALL: {
- int nargs = context->socketcall.nargs;
- audit_log_format(ab, "nargs=%d", nargs);
- for (i = 0; i < nargs; i++)
- audit_log_format(ab, " a%d=%lx", i,
- context->socketcall.args[i]);
- break; }
- case AUDIT_IPC: {
- u32 osid = context->ipc.osid;
- audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
- from_kuid(&init_user_ns, context->ipc.uid),
- from_kgid(&init_user_ns, context->ipc.gid),
- context->ipc.mode);
- if (osid) {
- char *ctx = NULL;
- u32 len;
- if (security_secid_to_secctx(osid, &ctx, &len)) {
- audit_log_format(ab, " osid=%u", osid);
- *call_panic = 1;
- } else {
- audit_log_format(ab, " obj=%s", ctx);
- security_release_secctx(ctx, len);
- }
- }
- if (context->ipc.has_perm) {
- audit_log_end(ab);
- ab = audit_log_start(context, GFP_KERNEL,
- AUDIT_IPC_SET_PERM);
- if (unlikely(!ab))
- return;
- audit_log_format(ab,
- "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
- context->ipc.qbytes,
- context->ipc.perm_uid,
- context->ipc.perm_gid,
- context->ipc.perm_mode);
- }
- break; }
- case AUDIT_MQ_OPEN:
- audit_log_format(ab,
- "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
- "mq_msgsize=%ld mq_curmsgs=%ld",
- context->mq_open.oflag, context->mq_open.mode,
- context->mq_open.attr.mq_flags,
- context->mq_open.attr.mq_maxmsg,
- context->mq_open.attr.mq_msgsize,
- context->mq_open.attr.mq_curmsgs);
- break;
- case AUDIT_MQ_SENDRECV:
- audit_log_format(ab,
- "mqdes=%d msg_len=%zd msg_prio=%u "
- "abs_timeout_sec=%lld abs_timeout_nsec=%ld",
- context->mq_sendrecv.mqdes,
- context->mq_sendrecv.msg_len,
- context->mq_sendrecv.msg_prio,
- (long long) context->mq_sendrecv.abs_timeout.tv_sec,
- context->mq_sendrecv.abs_timeout.tv_nsec);
- break;
- case AUDIT_MQ_NOTIFY:
- audit_log_format(ab, "mqdes=%d sigev_signo=%d",
- context->mq_notify.mqdes,
- context->mq_notify.sigev_signo);
- break;
- case AUDIT_MQ_GETSETATTR: {
- struct mq_attr *attr = &context->mq_getsetattr.mqstat;
- audit_log_format(ab,
- "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
- "mq_curmsgs=%ld ",
- context->mq_getsetattr.mqdes,
- attr->mq_flags, attr->mq_maxmsg,
- attr->mq_msgsize, attr->mq_curmsgs);
- break; }
- case AUDIT_CAPSET:
- audit_log_format(ab, "pid=%d", context->capset.pid);
- audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
- audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
- audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
- audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient);
- break;
- case AUDIT_MMAP:
- audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
- context->mmap.flags);
- break;
- case AUDIT_EXECVE:
- audit_log_execve_info(context, &ab);
- break;
- case AUDIT_KERN_MODULE:
- audit_log_format(ab, "name=");
- if (context->module.name) {
- audit_log_untrustedstring(ab, context->module.name);
- kfree(context->module.name);
- } else
- audit_log_format(ab, "(null)");
- break;
- }
- audit_log_end(ab);
- }
- static inline int audit_proctitle_rtrim(char *proctitle, int len)
- {
- char *end = proctitle + len - 1;
- while (end > proctitle && !isprint(*end))
- end--;
- /* catch the case where proctitle is only 1 non-print character */
- len = end - proctitle + 1;
- len -= isprint(proctitle[len-1]) == 0;
- return len;
- }
- static void audit_log_proctitle(struct task_struct *tsk,
- struct audit_context *context)
- {
- int res;
- char *buf;
- char *msg = "(null)";
- int len = strlen(msg);
- struct audit_buffer *ab;
- ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
- if (!ab)
- return; /* audit_panic or being filtered */
- audit_log_format(ab, "proctitle=");
- /* Not cached */
- if (!context->proctitle.value) {
- buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
- if (!buf)
- goto out;
- /* Historically called this from procfs naming */
- res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN);
- if (res == 0) {
- kfree(buf);
- goto out;
- }
- res = audit_proctitle_rtrim(buf, res);
- if (res == 0) {
- kfree(buf);
- goto out;
- }
- context->proctitle.value = buf;
- context->proctitle.len = res;
- }
- msg = context->proctitle.value;
- len = context->proctitle.len;
- out:
- audit_log_n_untrustedstring(ab, msg, len);
- audit_log_end(ab);
- }
- static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
- {
- int i, call_panic = 0;
- struct audit_buffer *ab;
- struct audit_aux_data *aux;
- struct audit_names *n;
- /* tsk == current */
- context->personality = tsk->personality;
- ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
- if (!ab)
- return; /* audit_panic has been called */
- audit_log_format(ab, "arch=%x syscall=%d",
- context->arch, context->major);
- if (context->personality != PER_LINUX)
- audit_log_format(ab, " per=%lx", context->personality);
- if (context->return_valid)
- audit_log_format(ab, " success=%s exit=%ld",
- (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
- context->return_code);
- audit_log_format(ab,
- " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
- context->argv[0],
- context->argv[1],
- context->argv[2],
- context->argv[3],
- context->name_count);
- audit_log_task_info(ab, tsk);
- audit_log_key(ab, context->filterkey);
- audit_log_end(ab);
- for (aux = context->aux; aux; aux = aux->next) {
- ab = audit_log_start(context, GFP_KERNEL, aux->type);
- if (!ab)
- continue; /* audit_panic has been called */
- switch (aux->type) {
- case AUDIT_BPRM_FCAPS: {
- struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
- audit_log_format(ab, "fver=%x", axs->fcap_ver);
- audit_log_cap(ab, "fp", &axs->fcap.permitted);
- audit_log_cap(ab, "fi", &axs->fcap.inheritable);
- audit_log_format(ab, " fe=%d", axs->fcap.fE);
- audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
- audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
- audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
- audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient);
- audit_log_cap(ab, "pp", &axs->new_pcap.permitted);
- audit_log_cap(ab, "pi", &axs->new_pcap.inheritable);
- audit_log_cap(ab, "pe", &axs->new_pcap.effective);
- audit_log_cap(ab, "pa", &axs->new_pcap.ambient);
- break; }
- }
- audit_log_end(ab);
- }
- if (context->type)
- show_special(context, &call_panic);
- if (context->fds[0] >= 0) {
- ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
- if (ab) {
- audit_log_format(ab, "fd0=%d fd1=%d",
- context->fds[0], context->fds[1]);
- audit_log_end(ab);
- }
- }
- if (context->sockaddr_len) {
- ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
- if (ab) {
- audit_log_format(ab, "saddr=");
- audit_log_n_hex(ab, (void *)context->sockaddr,
- context->sockaddr_len);
- audit_log_end(ab);
- }
- }
- for (aux = context->aux_pids; aux; aux = aux->next) {
- struct audit_aux_data_pids *axs = (void *)aux;
- for (i = 0; i < axs->pid_count; i++)
- if (audit_log_pid_context(context, axs->target_pid[i],
- axs->target_auid[i],
- axs->target_uid[i],
- axs->target_sessionid[i],
- axs->target_sid[i],
- axs->target_comm[i]))
- call_panic = 1;
- }
- if (context->target_pid &&
- audit_log_pid_context(context, context->target_pid,
- context->target_auid, context->target_uid,
- context->target_sessionid,
- context->target_sid, context->target_comm))
- call_panic = 1;
- if (context->pwd.dentry && context->pwd.mnt) {
- ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
- if (ab) {
- audit_log_d_path(ab, "cwd=", &context->pwd);
- audit_log_end(ab);
- }
- }
- i = 0;
- list_for_each_entry(n, &context->names_list, list) {
- if (n->hidden)
- continue;
- audit_log_name(context, n, NULL, i++, &call_panic);
- }
- audit_log_proctitle(tsk, context);
- /* Send end of event record to help user space know we are finished */
- ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
- if (ab)
- audit_log_end(ab);
- if (call_panic)
- audit_panic("error converting sid to string");
- }
- /**
- * __audit_free - free a per-task audit context
- * @tsk: task whose audit context block to free
- *
- * Called from copy_process and do_exit
- */
- void __audit_free(struct task_struct *tsk)
- {
- struct audit_context *context;
- context = audit_take_context(tsk, 0, 0);
- if (!context)
- return;
- /* Check for system calls that do not go through the exit
- * function (e.g., exit_group), then free context block.
- * We use GFP_ATOMIC here because we might be doing this
- * in the context of the idle thread */
- /* that can happen only if we are called from do_exit() */
- if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
- audit_log_exit(context, tsk);
- if (!list_empty(&context->killed_trees))
- audit_kill_trees(&context->killed_trees);
- audit_free_context(context);
- }
- /**
- * __audit_syscall_entry - fill in an audit record at syscall entry
- * @major: major syscall type (function)
- * @a1: additional syscall register 1
- * @a2: additional syscall register 2
- * @a3: additional syscall register 3
- * @a4: additional syscall register 4
- *
- * Fill in audit context at syscall entry. This only happens if the
- * audit context was created when the task was created and the state or
- * filters demand the audit context be built. If the state from the
- * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
- * then the record will be written at syscall exit time (otherwise, it
- * will only be written if another part of the kernel requests that it
- * be written).
- */
- void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
- unsigned long a3, unsigned long a4)
- {
- struct task_struct *tsk = current;
- struct audit_context *context = tsk->audit_context;
- enum audit_state state;
- if (!context)
- return;
- BUG_ON(context->in_syscall || context->name_count);
- if (!audit_enabled)
- return;
- context->arch = syscall_get_arch();
- context->major = major;
- context->argv[0] = a1;
- context->argv[1] = a2;
- context->argv[2] = a3;
- context->argv[3] = a4;
- state = context->state;
- context->dummy = !audit_n_rules;
- if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
- context->prio = 0;
- state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
- }
- if (state == AUDIT_DISABLED)
- return;
- context->serial = 0;
- context->ctime = current_kernel_time64();
- context->in_syscall = 1;
- context->current_state = state;
- context->ppid = 0;
- }
- /**
- * __audit_syscall_exit - deallocate audit context after a system call
- * @success: success value of the syscall
- * @return_code: return value of the syscall
- *
- * Tear down after system call. If the audit context has been marked as
- * auditable (either because of the AUDIT_RECORD_CONTEXT state from
- * filtering, or because some other part of the kernel wrote an audit
- * message), then write out the syscall information. In call cases,
- * free the names stored from getname().
- */
- void __audit_syscall_exit(int success, long return_code)
- {
- struct task_struct *tsk = current;
- struct audit_context *context;
- if (success)
- success = AUDITSC_SUCCESS;
- else
- success = AUDITSC_FAILURE;
- context = audit_take_context(tsk, success, return_code);
- if (!context)
- return;
- if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
- audit_log_exit(context, tsk);
- context->in_syscall = 0;
- context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
- if (!list_empty(&context->killed_trees))
- audit_kill_trees(&context->killed_trees);
- audit_free_names(context);
- unroll_tree_refs(context, NULL, 0);
- audit_free_aux(context);
- context->aux = NULL;
- context->aux_pids = NULL;
- context->target_pid = 0;
- context->target_sid = 0;
- context->sockaddr_len = 0;
- context->type = 0;
- context->fds[0] = -1;
- if (context->state != AUDIT_RECORD_CONTEXT) {
- kfree(context->filterkey);
- context->filterkey = NULL;
- }
- tsk->audit_context = context;
- }
- static inline void handle_one(const struct inode *inode)
- {
- #ifdef CONFIG_AUDIT_TREE
- struct audit_context *context;
- struct audit_tree_refs *p;
- struct audit_chunk *chunk;
- int count;
- if (likely(!inode->i_fsnotify_marks))
- return;
- context = current->audit_context;
- p = context->trees;
- count = context->tree_count;
- rcu_read_lock();
- chunk = audit_tree_lookup(inode);
- rcu_read_unlock();
- if (!chunk)
- return;
- if (likely(put_tree_ref(context, chunk)))
- return;
- if (unlikely(!grow_tree_refs(context))) {
- pr_warn("out of memory, audit has lost a tree reference\n");
- audit_set_auditable(context);
- audit_put_chunk(chunk);
- unroll_tree_refs(context, p, count);
- return;
- }
- put_tree_ref(context, chunk);
- #endif
- }
- static void handle_path(const struct dentry *dentry)
- {
- #ifdef CONFIG_AUDIT_TREE
- struct audit_context *context;
- struct audit_tree_refs *p;
- const struct dentry *d, *parent;
- struct audit_chunk *drop;
- unsigned long seq;
- int count;
- context = current->audit_context;
- p = context->trees;
- count = context->tree_count;
- retry:
- drop = NULL;
- d = dentry;
- rcu_read_lock();
- seq = read_seqbegin(&rename_lock);
- for(;;) {
- struct inode *inode = d_backing_inode(d);
- if (inode && unlikely(inode->i_fsnotify_marks)) {
- struct audit_chunk *chunk;
- chunk = audit_tree_lookup(inode);
- if (chunk) {
- if (unlikely(!put_tree_ref(context, chunk))) {
- drop = chunk;
- break;
- }
- }
- }
- parent = d->d_parent;
- if (parent == d)
- break;
- d = parent;
- }
- if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
- rcu_read_unlock();
- if (!drop) {
- /* just a race with rename */
- unroll_tree_refs(context, p, count);
- goto retry;
- }
- audit_put_chunk(drop);
- if (grow_tree_refs(context)) {
- /* OK, got more space */
- unroll_tree_refs(context, p, count);
- goto retry;
- }
- /* too bad */
- pr_warn("out of memory, audit has lost a tree reference\n");
- unroll_tree_refs(context, p, count);
- audit_set_auditable(context);
- return;
- }
- rcu_read_unlock();
- #endif
- }
- static struct audit_names *audit_alloc_name(struct audit_context *context,
- unsigned char type)
- {
- struct audit_names *aname;
- if (context->name_count < AUDIT_NAMES) {
- aname = &context->preallocated_names[context->name_count];
- memset(aname, 0, sizeof(*aname));
- } else {
- aname = kzalloc(sizeof(*aname), GFP_NOFS);
- if (!aname)
- return NULL;
- aname->should_free = true;
- }
- aname->ino = AUDIT_INO_UNSET;
- aname->type = type;
- list_add_tail(&aname->list, &context->names_list);
- context->name_count++;
- return aname;
- }
- /**
- * __audit_reusename - fill out filename with info from existing entry
- * @uptr: userland ptr to pathname
- *
- * Search the audit_names list for the current audit context. If there is an
- * existing entry with a matching "uptr" then return the filename
- * associated with that audit_name. If not, return NULL.
- */
- struct filename *
- __audit_reusename(const __user char *uptr)
- {
- struct audit_context *context = current->audit_context;
- struct audit_names *n;
- list_for_each_entry(n, &context->names_list, list) {
- if (!n->name)
- continue;
- if (n->name->uptr == uptr) {
- n->name->refcnt++;
- return n->name;
- }
- }
- return NULL;
- }
- /**
- * __audit_getname - add a name to the list
- * @name: name to add
- *
- * Add a name to the list of audit names for this context.
- * Called from fs/namei.c:getname().
- */
- void __audit_getname(struct filename *name)
- {
- struct audit_context *context = current->audit_context;
- struct audit_names *n;
- if (!context->in_syscall)
- return;
- n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
- if (!n)
- return;
- n->name = name;
- n->name_len = AUDIT_NAME_FULL;
- name->aname = n;
- name->refcnt++;
- if (!context->pwd.dentry)
- get_fs_pwd(current->fs, &context->pwd);
- }
- /**
- * __audit_inode - store the inode and device from a lookup
- * @name: name being audited
- * @dentry: dentry being audited
- * @flags: attributes for this particular entry
- */
- void __audit_inode(struct filename *name, const struct dentry *dentry,
- unsigned int flags)
- {
- struct audit_context *context = current->audit_context;
- struct inode *inode = d_backing_inode(dentry);
- struct audit_names *n;
- bool parent = flags & AUDIT_INODE_PARENT;
- if (!context->in_syscall)
- return;
- if (!name)
- goto out_alloc;
- /*
- * If we have a pointer to an audit_names entry already, then we can
- * just use it directly if the type is correct.
- */
- n = name->aname;
- if (n) {
- if (parent) {
- if (n->type == AUDIT_TYPE_PARENT ||
- n->type == AUDIT_TYPE_UNKNOWN)
- goto out;
- } else {
- if (n->type != AUDIT_TYPE_PARENT)
- goto out;
- }
- }
- list_for_each_entry_reverse(n, &context->names_list, list) {
- if (n->ino) {
- /* valid inode number, use that for the comparison */
- if (n->ino != inode->i_ino ||
- n->dev != inode->i_sb->s_dev)
- continue;
- } else if (n->name) {
- /* inode number has not been set, check the name */
- if (strcmp(n->name->name, name->name))
- continue;
- } else
- /* no inode and no name (?!) ... this is odd ... */
- continue;
- /* match the correct record type */
- if (parent) {
- if (n->type == AUDIT_TYPE_PARENT ||
- n->type == AUDIT_TYPE_UNKNOWN)
- goto out;
- } else {
- if (n->type != AUDIT_TYPE_PARENT)
- goto out;
- }
- }
- out_alloc:
- /* unable to find an entry with both a matching name and type */
- n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
- if (!n)
- return;
- if (name) {
- n->name = name;
- name->refcnt++;
- }
- out:
- if (parent) {
- n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
- n->type = AUDIT_TYPE_PARENT;
- if (flags & AUDIT_INODE_HIDDEN)
- n->hidden = true;
- } else {
- n->name_len = AUDIT_NAME_FULL;
- n->type = AUDIT_TYPE_NORMAL;
- }
- handle_path(dentry);
- audit_copy_inode(n, dentry, inode);
- }
- void __audit_file(const struct file *file)
- {
- __audit_inode(NULL, file->f_path.dentry, 0);
- }
- /**
- * __audit_inode_child - collect inode info for created/removed objects
- * @parent: inode of dentry parent
- * @dentry: dentry being audited
- * @type: AUDIT_TYPE_* value that we're looking for
- *
- * For syscalls that create or remove filesystem objects, audit_inode
- * can only collect information for the filesystem object's parent.
- * This call updates the audit context with the child's information.
- * Syscalls that create a new filesystem object must be hooked after
- * the object is created. Syscalls that remove a filesystem object
- * must be hooked prior, in order to capture the target inode during
- * unsuccessful attempts.
- */
- void __audit_inode_child(struct inode *parent,
- const struct dentry *dentry,
- const unsigned char type)
- {
- struct audit_context *context = current->audit_context;
- struct inode *inode = d_backing_inode(dentry);
- const char *dname = dentry->d_name.name;
- struct audit_names *n, *found_parent = NULL, *found_child = NULL;
- if (!context->in_syscall)
- return;
- if (inode)
- handle_one(inode);
- /* look for a parent entry first */
- list_for_each_entry(n, &context->names_list, list) {
- if (!n->name ||
- (n->type != AUDIT_TYPE_PARENT &&
- n->type != AUDIT_TYPE_UNKNOWN))
- continue;
- if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
- !audit_compare_dname_path(dname,
- n->name->name, n->name_len)) {
- if (n->type == AUDIT_TYPE_UNKNOWN)
- n->type = AUDIT_TYPE_PARENT;
- found_parent = n;
- break;
- }
- }
- /* is there a matching child entry? */
- list_for_each_entry(n, &context->names_list, list) {
- /* can only match entries that have a name */
- if (!n->name ||
- (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
- continue;
- if (!strcmp(dname, n->name->name) ||
- !audit_compare_dname_path(dname, n->name->name,
- found_parent ?
- found_parent->name_len :
- AUDIT_NAME_FULL)) {
- if (n->type == AUDIT_TYPE_UNKNOWN)
- n->type = type;
- found_child = n;
- break;
- }
- }
- if (!found_parent) {
- /* create a new, "anonymous" parent record */
- n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
- if (!n)
- return;
- audit_copy_inode(n, NULL, parent);
- }
- if (!found_child) {
- found_child = audit_alloc_name(context, type);
- if (!found_child)
- return;
- /* Re-use the name belonging to the slot for a matching parent
- * directory. All names for this context are relinquished in
- * audit_free_names() */
- if (found_parent) {
- found_child->name = found_parent->name;
- found_child->name_len = AUDIT_NAME_FULL;
- found_child->name->refcnt++;
- }
- }
- if (inode)
- audit_copy_inode(found_child, dentry, inode);
- else
- found_child->ino = AUDIT_INO_UNSET;
- }
- EXPORT_SYMBOL_GPL(__audit_inode_child);
- /**
- * auditsc_get_stamp - get local copies of audit_context values
- * @ctx: audit_context for the task
- * @t: timespec64 to store time recorded in the audit_context
- * @serial: serial value that is recorded in the audit_context
- *
- * Also sets the context as auditable.
- */
- int auditsc_get_stamp(struct audit_context *ctx,
- struct timespec64 *t, unsigned int *serial)
- {
- if (!ctx->in_syscall)
- return 0;
- if (!ctx->serial)
- ctx->serial = audit_serial();
- t->tv_sec = ctx->ctime.tv_sec;
- t->tv_nsec = ctx->ctime.tv_nsec;
- *serial = ctx->serial;
- if (!ctx->prio) {
- ctx->prio = 1;
- ctx->current_state = AUDIT_RECORD_CONTEXT;
- }
- return 1;
- }
- /* global counter which is incremented every time something logs in */
- static atomic_t session_id = ATOMIC_INIT(0);
- static int audit_set_loginuid_perm(kuid_t loginuid)
- {
- /* if we are unset, we don't need privs */
- if (!audit_loginuid_set(current))
- return 0;
- /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/
- if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE))
- return -EPERM;
- /* it is set, you need permission */
- if (!capable(CAP_AUDIT_CONTROL))
- return -EPERM;
- /* reject if this is not an unset and we don't allow that */
- if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid))
- return -EPERM;
- return 0;
- }
- static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
- unsigned int oldsessionid, unsigned int sessionid,
- int rc)
- {
- struct audit_buffer *ab;
- uid_t uid, oldloginuid, loginuid;
- struct tty_struct *tty;
- if (!audit_enabled)
- return;
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
- if (!ab)
- return;
- uid = from_kuid(&init_user_ns, task_uid(current));
- oldloginuid = from_kuid(&init_user_ns, koldloginuid);
- loginuid = from_kuid(&init_user_ns, kloginuid),
- tty = audit_get_tty(current);
- audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid);
- audit_log_task_context(ab);
- audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d",
- oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",
- oldsessionid, sessionid, !rc);
- audit_put_tty(tty);
- audit_log_end(ab);
- }
- /**
- * audit_set_loginuid - set current task's audit_context loginuid
- * @loginuid: loginuid value
- *
- * Returns 0.
- *
- * Called (set) from fs/proc/base.c::proc_loginuid_write().
- */
- int audit_set_loginuid(kuid_t loginuid)
- {
- struct task_struct *task = current;
- unsigned int oldsessionid, sessionid = (unsigned int)-1;
- kuid_t oldloginuid;
- int rc;
- oldloginuid = audit_get_loginuid(current);
- oldsessionid = audit_get_sessionid(current);
- rc = audit_set_loginuid_perm(loginuid);
- if (rc)
- goto out;
- /* are we setting or clearing? */
- if (uid_valid(loginuid)) {
- sessionid = (unsigned int)atomic_inc_return(&session_id);
- if (unlikely(sessionid == (unsigned int)-1))
- sessionid = (unsigned int)atomic_inc_return(&session_id);
- }
- task->sessionid = sessionid;
- task->loginuid = loginuid;
- out:
- audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc);
- return rc;
- }
- /**
- * __audit_mq_open - record audit data for a POSIX MQ open
- * @oflag: open flag
- * @mode: mode bits
- * @attr: queue attributes
- *
- */
- void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
- {
- struct audit_context *context = current->audit_context;
- if (attr)
- memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
- else
- memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
- context->mq_open.oflag = oflag;
- context->mq_open.mode = mode;
- context->type = AUDIT_MQ_OPEN;
- }
- /**
- * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
- * @mqdes: MQ descriptor
- * @msg_len: Message length
- * @msg_prio: Message priority
- * @abs_timeout: Message timeout in absolute time
- *
- */
- void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
- const struct timespec64 *abs_timeout)
- {
- struct audit_context *context = current->audit_context;
- struct timespec64 *p = &context->mq_sendrecv.abs_timeout;
- if (abs_timeout)
- memcpy(p, abs_timeout, sizeof(*p));
- else
- memset(p, 0, sizeof(*p));
- context->mq_sendrecv.mqdes = mqdes;
- context->mq_sendrecv.msg_len = msg_len;
- context->mq_sendrecv.msg_prio = msg_prio;
- context->type = AUDIT_MQ_SENDRECV;
- }
- /**
- * __audit_mq_notify - record audit data for a POSIX MQ notify
- * @mqdes: MQ descriptor
- * @notification: Notification event
- *
- */
- void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
- {
- struct audit_context *context = current->audit_context;
- if (notification)
- context->mq_notify.sigev_signo = notification->sigev_signo;
- else
- context->mq_notify.sigev_signo = 0;
- context->mq_notify.mqdes = mqdes;
- context->type = AUDIT_MQ_NOTIFY;
- }
- /**
- * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
- * @mqdes: MQ descriptor
- * @mqstat: MQ flags
- *
- */
- void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
- {
- struct audit_context *context = current->audit_context;
- context->mq_getsetattr.mqdes = mqdes;
- context->mq_getsetattr.mqstat = *mqstat;
- context->type = AUDIT_MQ_GETSETATTR;
- }
- /**
- * __audit_ipc_obj - record audit data for ipc object
- * @ipcp: ipc permissions
- *
- */
- void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
- {
- struct audit_context *context = current->audit_context;
- context->ipc.uid = ipcp->uid;
- context->ipc.gid = ipcp->gid;
- context->ipc.mode = ipcp->mode;
- context->ipc.has_perm = 0;
- security_ipc_getsecid(ipcp, &context->ipc.osid);
- context->type = AUDIT_IPC;
- }
- /**
- * __audit_ipc_set_perm - record audit data for new ipc permissions
- * @qbytes: msgq bytes
- * @uid: msgq user id
- * @gid: msgq group id
- * @mode: msgq mode (permissions)
- *
- * Called only after audit_ipc_obj().
- */
- void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
- {
- struct audit_context *context = current->audit_context;
- context->ipc.qbytes = qbytes;
- context->ipc.perm_uid = uid;
- context->ipc.perm_gid = gid;
- context->ipc.perm_mode = mode;
- context->ipc.has_perm = 1;
- }
- void __audit_bprm(struct linux_binprm *bprm)
- {
- struct audit_context *context = current->audit_context;
- context->type = AUDIT_EXECVE;
- context->execve.argc = bprm->argc;
- }
- /**
- * __audit_socketcall - record audit data for sys_socketcall
- * @nargs: number of args, which should not be more than AUDITSC_ARGS.
- * @args: args array
- *
- */
- int __audit_socketcall(int nargs, unsigned long *args)
- {
- struct audit_context *context = current->audit_context;
- if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
- return -EINVAL;
- context->type = AUDIT_SOCKETCALL;
- context->socketcall.nargs = nargs;
- memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
- return 0;
- }
- /**
- * __audit_fd_pair - record audit data for pipe and socketpair
- * @fd1: the first file descriptor
- * @fd2: the second file descriptor
- *
- */
- void __audit_fd_pair(int fd1, int fd2)
- {
- struct audit_context *context = current->audit_context;
- context->fds[0] = fd1;
- context->fds[1] = fd2;
- }
- /**
- * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
- * @len: data length in user space
- * @a: data address in kernel space
- *
- * Returns 0 for success or NULL context or < 0 on error.
- */
- int __audit_sockaddr(int len, void *a)
- {
- struct audit_context *context = current->audit_context;
- if (!context->sockaddr) {
- void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
- if (!p)
- return -ENOMEM;
- context->sockaddr = p;
- }
- context->sockaddr_len = len;
- memcpy(context->sockaddr, a, len);
- return 0;
- }
- void __audit_ptrace(struct task_struct *t)
- {
- struct audit_context *context = current->audit_context;
- context->target_pid = task_tgid_nr(t);
- context->target_auid = audit_get_loginuid(t);
- context->target_uid = task_uid(t);
- context->target_sessionid = audit_get_sessionid(t);
- security_task_getsecid(t, &context->target_sid);
- memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
- }
- /**
- * audit_signal_info - record signal info for shutting down audit subsystem
- * @sig: signal value
- * @t: task being signaled
- *
- * If the audit subsystem is being terminated, record the task (pid)
- * and uid that is doing that.
- */
- int audit_signal_info(int sig, struct task_struct *t)
- {
- struct audit_aux_data_pids *axp;
- struct task_struct *tsk = current;
- struct audit_context *ctx = tsk->audit_context;
- kuid_t uid = current_uid(), t_uid = task_uid(t);
- if (auditd_test_task(t) &&
- (sig == SIGTERM || sig == SIGHUP ||
- sig == SIGUSR1 || sig == SIGUSR2)) {
- audit_sig_pid = task_tgid_nr(tsk);
- if (uid_valid(tsk->loginuid))
- audit_sig_uid = tsk->loginuid;
- else
- audit_sig_uid = uid;
- security_task_getsecid(tsk, &audit_sig_sid);
- }
- if (!audit_signals || audit_dummy_context())
- return 0;
- /* optimize the common case by putting first signal recipient directly
- * in audit_context */
- if (!ctx->target_pid) {
- ctx->target_pid = task_tgid_nr(t);
- ctx->target_auid = audit_get_loginuid(t);
- ctx->target_uid = t_uid;
- ctx->target_sessionid = audit_get_sessionid(t);
- security_task_getsecid(t, &ctx->target_sid);
- memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
- return 0;
- }
- axp = (void *)ctx->aux_pids;
- if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
- axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
- if (!axp)
- return -ENOMEM;
- axp->d.type = AUDIT_OBJ_PID;
- axp->d.next = ctx->aux_pids;
- ctx->aux_pids = (void *)axp;
- }
- BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
- axp->target_pid[axp->pid_count] = task_tgid_nr(t);
- axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
- axp->target_uid[axp->pid_count] = t_uid;
- axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
- security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
- memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
- axp->pid_count++;
- return 0;
- }
- /**
- * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
- * @bprm: pointer to the bprm being processed
- * @new: the proposed new credentials
- * @old: the old credentials
- *
- * Simply check if the proc already has the caps given by the file and if not
- * store the priv escalation info for later auditing at the end of the syscall
- *
- * -Eric
- */
- int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
- const struct cred *new, const struct cred *old)
- {
- struct audit_aux_data_bprm_fcaps *ax;
- struct audit_context *context = current->audit_context;
- struct cpu_vfs_cap_data vcaps;
- ax = kmalloc(sizeof(*ax), GFP_KERNEL);
- if (!ax)
- return -ENOMEM;
- ax->d.type = AUDIT_BPRM_FCAPS;
- ax->d.next = context->aux;
- context->aux = (void *)ax;
- get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
- ax->fcap.permitted = vcaps.permitted;
- ax->fcap.inheritable = vcaps.inheritable;
- ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
- ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
- ax->old_pcap.permitted = old->cap_permitted;
- ax->old_pcap.inheritable = old->cap_inheritable;
- ax->old_pcap.effective = old->cap_effective;
- ax->old_pcap.ambient = old->cap_ambient;
- ax->new_pcap.permitted = new->cap_permitted;
- ax->new_pcap.inheritable = new->cap_inheritable;
- ax->new_pcap.effective = new->cap_effective;
- ax->new_pcap.ambient = new->cap_ambient;
- return 0;
- }
- /**
- * __audit_log_capset - store information about the arguments to the capset syscall
- * @new: the new credentials
- * @old: the old (current) credentials
- *
- * Record the arguments userspace sent to sys_capset for later printing by the
- * audit system if applicable
- */
- void __audit_log_capset(const struct cred *new, const struct cred *old)
- {
- struct audit_context *context = current->audit_context;
- context->capset.pid = task_tgid_nr(current);
- context->capset.cap.effective = new->cap_effective;
- context->capset.cap.inheritable = new->cap_effective;
- context->capset.cap.permitted = new->cap_permitted;
- context->capset.cap.ambient = new->cap_ambient;
- context->type = AUDIT_CAPSET;
- }
- void __audit_mmap_fd(int fd, int flags)
- {
- struct audit_context *context = current->audit_context;
- context->mmap.fd = fd;
- context->mmap.flags = flags;
- context->type = AUDIT_MMAP;
- }
- void __audit_log_kern_module(char *name)
- {
- struct audit_context *context = current->audit_context;
- context->module.name = kstrdup(name, GFP_KERNEL);
- if (!context->module.name)
- audit_log_lost("out of memory in __audit_log_kern_module");
- context->type = AUDIT_KERN_MODULE;
- }
- static void audit_log_task(struct audit_buffer *ab)
- {
- kuid_t auid, uid;
- kgid_t gid;
- unsigned int sessionid;
- char comm[sizeof(current->comm)];
- auid = audit_get_loginuid(current);
- sessionid = audit_get_sessionid(current);
- current_uid_gid(&uid, &gid);
- audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
- from_kuid(&init_user_ns, auid),
- from_kuid(&init_user_ns, uid),
- from_kgid(&init_user_ns, gid),
- sessionid);
- audit_log_task_context(ab);
- audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
- audit_log_untrustedstring(ab, get_task_comm(comm, current));
- audit_log_d_path_exe(ab, current->mm);
- }
- /**
- * audit_core_dumps - record information about processes that end abnormally
- * @signr: signal value
- *
- * If a process ends with a core dump, something fishy is going on and we
- * should record the event for investigation.
- */
- void audit_core_dumps(long signr)
- {
- struct audit_buffer *ab;
- if (!audit_enabled)
- return;
- if (signr == SIGQUIT) /* don't care for those */
- return;
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
- if (unlikely(!ab))
- return;
- audit_log_task(ab);
- audit_log_format(ab, " sig=%ld res=1", signr);
- audit_log_end(ab);
- }
- void __audit_seccomp(unsigned long syscall, long signr, int code)
- {
- struct audit_buffer *ab;
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
- if (unlikely(!ab))
- return;
- audit_log_task(ab);
- audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
- signr, syscall_get_arch(), syscall,
- in_compat_syscall(), KSTK_EIP(current), code);
- audit_log_end(ab);
- }
- struct list_head *audit_killed_trees(void)
- {
- struct audit_context *ctx = current->audit_context;
- if (likely(!ctx || !ctx->in_syscall))
- return NULL;
- return &ctx->killed_trees;
- }
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