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kernel/auditsc.c
64.7 KB
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/* auditsc.c -- System-call auditing support |
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* Handles all system-call specific auditing features. * * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. |
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* Copyright 2005 Hewlett-Packard Development Company, L.P. |
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* Copyright (C) 2005, 2006 IBM Corporation |
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* 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. * |
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* POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>, * 2006. * |
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* The support of additional filter rules compares (>, <, >=, <=) was * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005. * |
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* Modified by Amy Griffis <amy.griffis@hp.com> to collect additional * filesystem information. |
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* * Subject and object context labeling support added by <danjones@us.ibm.com> * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/init.h> |
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#include <asm/types.h> |
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#include <linux/atomic.h> |
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#include <linux/fs.h> #include <linux/namei.h> |
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#include <linux/mm.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/mount.h> |
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#include <linux/socket.h> |
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#include <linux/mqueue.h> |
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#include <linux/audit.h> #include <linux/personality.h> #include <linux/time.h> |
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#include <linux/netlink.h> |
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#include <linux/compiler.h> |
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#include <asm/unistd.h> |
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#include <linux/security.h> |
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#include <linux/list.h> |
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#include <linux/binfmts.h> |
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#include <linux/highmem.h> |
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#include <linux/syscalls.h> |
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#include <asm/syscall.h> |
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#include <linux/capability.h> |
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#include <linux/fs_struct.h> |
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#include <linux/compat.h> |
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#include <linux/ctype.h> |
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#include <linux/string.h> |
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#include <linux/uaccess.h> |
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#include <uapi/linux/limits.h> |
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#include "audit.h" |
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/* flags stating the success for a syscall */ #define AUDITSC_INVALID 0 #define AUDITSC_SUCCESS 1 #define AUDITSC_FAILURE 2 |
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/* 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 */ |
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#define MAX_EXECVE_AUDIT_LEN 7500 |
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/* max length to print of cmdline/proctitle value during audit */ #define MAX_PROCTITLE_AUDIT_LEN 128 |
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/* number of audit rules */ int audit_n_rules; |
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/* determines whether we collect data for signals sent */ int audit_signals; |
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struct audit_aux_data { struct audit_aux_data *next; int type; }; #define AUDIT_AUX_IPCPERM 0 |
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/* Number of target pids per aux struct. */ #define AUDIT_AUX_PIDS 16 |
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struct audit_aux_data_pids { struct audit_aux_data d; pid_t target_pid[AUDIT_AUX_PIDS]; |
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kuid_t target_auid[AUDIT_AUX_PIDS]; |
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kuid_t target_uid[AUDIT_AUX_PIDS]; |
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unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
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u32 target_sid[AUDIT_AUX_PIDS]; |
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char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
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int pid_count; }; |
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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; }; |
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struct audit_tree_refs { struct audit_tree_refs *next; struct audit_chunk *c[31]; }; |
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static int audit_match_perm(struct audit_context *ctx, int mask) { |
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unsigned n; |
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if (unlikely(!ctx)) return 0; |
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n = ctx->major; |
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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; } } |
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static int audit_match_filetype(struct audit_context *ctx, int val) |
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{ |
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struct audit_names *n; |
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umode_t mode = (umode_t)val; |
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if (unlikely(!ctx)) return 0; |
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list_for_each_entry(n, &ctx->names_list, list) { |
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if ((n->ino != AUDIT_INO_UNSET) && |
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((n->mode & S_IFMT) == mode)) |
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return 1; } |
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return 0; |
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} |
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/* * 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 |
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static void audit_set_auditable(struct audit_context *ctx) { if (!ctx->prio) { ctx->prio = 1; ctx->current_state = AUDIT_RECORD_CONTEXT; } } |
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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; } |
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static int audit_compare_uid(kuid_t uid, struct audit_names *name, struct audit_field *f, struct audit_context *ctx) |
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{ struct audit_names *n; |
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int rc; |
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if (name) { |
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rc = audit_uid_comparator(uid, f->op, name->uid); |
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if (rc) return rc; } |
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if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { |
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rc = audit_uid_comparator(uid, f->op, n->uid); if (rc) return rc; } } return 0; } |
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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); |
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if (rc) return rc; } } return 0; } |
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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) { |
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switch (f->val) { |
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/* process to file object comparisons */ |
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case AUDIT_COMPARE_UID_TO_OBJ_UID: |
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return audit_compare_uid(cred->uid, name, f, ctx); |
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case AUDIT_COMPARE_GID_TO_OBJ_GID: |
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return audit_compare_gid(cred->gid, name, f, ctx); |
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case AUDIT_COMPARE_EUID_TO_OBJ_UID: |
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return audit_compare_uid(cred->euid, name, f, ctx); |
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case AUDIT_COMPARE_EGID_TO_OBJ_GID: |
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return audit_compare_gid(cred->egid, name, f, ctx); |
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case AUDIT_COMPARE_AUID_TO_OBJ_UID: |
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return audit_compare_uid(tsk->loginuid, name, f, ctx); |
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case AUDIT_COMPARE_SUID_TO_OBJ_UID: |
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return audit_compare_uid(cred->suid, name, f, ctx); |
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case AUDIT_COMPARE_SGID_TO_OBJ_GID: |
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return audit_compare_gid(cred->sgid, name, f, ctx); |
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case AUDIT_COMPARE_FSUID_TO_OBJ_UID: |
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return audit_compare_uid(cred->fsuid, name, f, ctx); |
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case AUDIT_COMPARE_FSGID_TO_OBJ_GID: |
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return audit_compare_gid(cred->fsgid, name, f, ctx); |
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/* uid comparisons */ case AUDIT_COMPARE_UID_TO_AUID: |
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return audit_uid_comparator(cred->uid, f->op, tsk->loginuid); |
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case AUDIT_COMPARE_UID_TO_EUID: |
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return audit_uid_comparator(cred->uid, f->op, cred->euid); |
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case AUDIT_COMPARE_UID_TO_SUID: |
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return audit_uid_comparator(cred->uid, f->op, cred->suid); |
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case AUDIT_COMPARE_UID_TO_FSUID: |
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return audit_uid_comparator(cred->uid, f->op, cred->fsuid); |
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/* auid comparisons */ case AUDIT_COMPARE_AUID_TO_EUID: |
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return audit_uid_comparator(tsk->loginuid, f->op, cred->euid); |
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case AUDIT_COMPARE_AUID_TO_SUID: |
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return audit_uid_comparator(tsk->loginuid, f->op, cred->suid); |
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case AUDIT_COMPARE_AUID_TO_FSUID: |
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return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid); |
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/* euid comparisons */ case AUDIT_COMPARE_EUID_TO_SUID: |
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return audit_uid_comparator(cred->euid, f->op, cred->suid); |
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case AUDIT_COMPARE_EUID_TO_FSUID: |
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return audit_uid_comparator(cred->euid, f->op, cred->fsuid); |
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/* suid comparisons */ case AUDIT_COMPARE_SUID_TO_FSUID: |
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return audit_uid_comparator(cred->suid, f->op, cred->fsuid); |
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/* gid comparisons */ case AUDIT_COMPARE_GID_TO_EGID: |
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return audit_gid_comparator(cred->gid, f->op, cred->egid); |
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case AUDIT_COMPARE_GID_TO_SGID: |
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return audit_gid_comparator(cred->gid, f->op, cred->sgid); |
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case AUDIT_COMPARE_GID_TO_FSGID: |
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return audit_gid_comparator(cred->gid, f->op, cred->fsgid); |
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/* egid comparisons */ case AUDIT_COMPARE_EGID_TO_SGID: |
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return audit_gid_comparator(cred->egid, f->op, cred->sgid); |
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case AUDIT_COMPARE_EGID_TO_FSGID: |
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return audit_gid_comparator(cred->egid, f->op, cred->fsgid); |
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/* sgid comparison */ case AUDIT_COMPARE_SGID_TO_FSGID: |
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return audit_gid_comparator(cred->sgid, f->op, cred->fsgid); |
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default: WARN(1, "Missing AUDIT_COMPARE define. Report as a bug "); return 0; } return 0; } |
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/* Determine if any context name data matches a rule's watch data */ |
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/* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
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* 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. */ |
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static int audit_filter_rules(struct task_struct *tsk, |
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struct audit_krule *rule, |
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struct audit_context *ctx, |
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struct audit_names *name, |
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enum audit_state *state, bool task_creation) |
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{ |
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const struct cred *cred; |
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int i, need_sid = 1; |
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u32 sid; |
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unsigned int sessionid; |
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cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); |
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for (i = 0; i < rule->field_count; i++) { |
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struct audit_field *f = &rule->fields[i]; |
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struct audit_names *n; |
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int result = 0; |
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pid_t pid; |
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switch (f->type) { |
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case AUDIT_PID: |
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pid = task_tgid_nr(tsk); |
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result = audit_comparator(pid, f->op, f->val); |
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break; |
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case AUDIT_PPID: |
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if (ctx) { if (!ctx->ppid) |
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ctx->ppid = task_ppid_nr(tsk); |
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result = audit_comparator(ctx->ppid, f->op, f->val); |
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} |
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break; |
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case AUDIT_EXE: result = audit_exe_compare(tsk, rule->exe); break; |
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case AUDIT_UID: |
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result = audit_uid_comparator(cred->uid, f->op, f->uid); |
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break; case AUDIT_EUID: |
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result = audit_uid_comparator(cred->euid, f->op, f->uid); |
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break; case AUDIT_SUID: |
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result = audit_uid_comparator(cred->suid, f->op, f->uid); |
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break; case AUDIT_FSUID: |
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result = audit_uid_comparator(cred->fsuid, f->op, f->uid); |
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break; case AUDIT_GID: |
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result = audit_gid_comparator(cred->gid, f->op, f->gid); |
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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); } |
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break; case AUDIT_EGID: |
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result = audit_gid_comparator(cred->egid, f->op, f->gid); |
37eebe39c
|
479 480 481 482 483 484 485 |
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); } |
1da177e4c
|
486 487 |
break; case AUDIT_SGID: |
ca57ec0f0
|
488 |
result = audit_gid_comparator(cred->sgid, f->op, f->gid); |
1da177e4c
|
489 490 |
break; case AUDIT_FSGID: |
ca57ec0f0
|
491 |
result = audit_gid_comparator(cred->fsgid, f->op, f->gid); |
1da177e4c
|
492 |
break; |
8fae47705
|
493 494 495 496 |
case AUDIT_SESSIONID: sessionid = audit_get_sessionid(current); result = audit_comparator(sessionid, f->op, f->val); break; |
1da177e4c
|
497 |
case AUDIT_PERS: |
93315ed6d
|
498 |
result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4c
|
499 |
break; |
2fd6f58ba
|
500 |
case AUDIT_ARCH: |
9f8dbe9c9
|
501 |
if (ctx) |
93315ed6d
|
502 |
result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58ba
|
503 |
break; |
1da177e4c
|
504 505 506 |
case AUDIT_EXIT: if (ctx && ctx->return_valid) |
93315ed6d
|
507 |
result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4c
|
508 509 |
break; case AUDIT_SUCCESS: |
b01f2cc1c
|
510 |
if (ctx && ctx->return_valid) { |
93315ed6d
|
511 512 |
if (f->val) result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); |
b01f2cc1c
|
513 |
else |
93315ed6d
|
514 |
result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1c
|
515 |
} |
1da177e4c
|
516 517 |
break; case AUDIT_DEVMAJOR: |
16c174bd9
|
518 519 520 521 522 |
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) { |
5195d8e21
|
523 |
list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd9
|
524 525 |
if (audit_comparator(MAJOR(n->dev), f->op, f->val) || audit_comparator(MAJOR(n->rdev), f->op, f->val)) { |
1da177e4c
|
526 527 528 529 530 531 532 |
++result; break; } } } break; case AUDIT_DEVMINOR: |
16c174bd9
|
533 534 535 536 537 |
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) { |
5195d8e21
|
538 |
list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd9
|
539 540 |
if (audit_comparator(MINOR(n->dev), f->op, f->val) || audit_comparator(MINOR(n->rdev), f->op, f->val)) { |
1da177e4c
|
541 542 543 544 545 546 547 |
++result; break; } } } break; case AUDIT_INODE: |
f368c07d7
|
548 |
if (name) |
db510fc5c
|
549 |
result = audit_comparator(name->ino, f->op, f->val); |
f368c07d7
|
550 |
else if (ctx) { |
5195d8e21
|
551 552 |
list_for_each_entry(n, &ctx->names_list, list) { if (audit_comparator(n->ino, f->op, f->val)) { |
1da177e4c
|
553 554 555 556 557 558 |
++result; break; } } } break; |
efaffd6e4
|
559 560 |
case AUDIT_OBJ_UID: if (name) { |
ca57ec0f0
|
561 |
result = audit_uid_comparator(name->uid, f->op, f->uid); |
efaffd6e4
|
562 563 |
} else if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { |
ca57ec0f0
|
564 |
if (audit_uid_comparator(n->uid, f->op, f->uid)) { |
efaffd6e4
|
565 566 567 568 569 570 |
++result; break; } } } break; |
54d3218b3
|
571 572 |
case AUDIT_OBJ_GID: if (name) { |
ca57ec0f0
|
573 |
result = audit_gid_comparator(name->gid, f->op, f->gid); |
54d3218b3
|
574 575 |
} else if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { |
ca57ec0f0
|
576 |
if (audit_gid_comparator(n->gid, f->op, f->gid)) { |
54d3218b3
|
577 578 579 580 581 582 |
++result; break; } } } break; |
f368c07d7
|
583 |
case AUDIT_WATCH: |
ae7b8f410
|
584 585 |
if (name) result = audit_watch_compare(rule->watch, name->ino, name->dev); |
f368c07d7
|
586 |
break; |
74c3cbe33
|
587 588 589 590 |
case AUDIT_DIR: if (ctx) result = match_tree_refs(ctx, rule->tree); break; |
1da177e4c
|
591 |
case AUDIT_LOGINUID: |
5c1390c9f
|
592 |
result = audit_uid_comparator(tsk->loginuid, f->op, f->uid); |
1da177e4c
|
593 |
break; |
780a7654c
|
594 595 596 |
case AUDIT_LOGINUID_SET: result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val); break; |
3a6b9f85c
|
597 598 599 600 601 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
3dc7e3153
|
602 603 604 605 606 |
/* 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 */ |
04305e4af
|
607 |
if (f->lsm_rule) { |
2ad312d20
|
608 |
if (need_sid) { |
2a862b32f
|
609 |
security_task_getsecid(tsk, &sid); |
2ad312d20
|
610 611 |
need_sid = 0; } |
d7a96f3a1
|
612 |
result = security_audit_rule_match(sid, f->type, |
3dc7e3153
|
613 |
f->op, |
04305e4af
|
614 |
f->lsm_rule, |
3dc7e3153
|
615 |
ctx); |
2ad312d20
|
616 |
} |
3dc7e3153
|
617 |
break; |
6e5a2d1d3
|
618 619 620 621 622 623 624 |
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 */ |
04305e4af
|
625 |
if (f->lsm_rule) { |
6e5a2d1d3
|
626 627 |
/* Find files that match */ if (name) { |
d7a96f3a1
|
628 |
result = security_audit_rule_match( |
6e5a2d1d3
|
629 |
name->osid, f->type, f->op, |
04305e4af
|
630 |
f->lsm_rule, ctx); |
6e5a2d1d3
|
631 |
} else if (ctx) { |
5195d8e21
|
632 633 634 635 |
list_for_each_entry(n, &ctx->names_list, list) { if (security_audit_rule_match(n->osid, f->type, f->op, f->lsm_rule, ctx)) { |
6e5a2d1d3
|
636 637 638 639 640 641 |
++result; break; } } } /* Find ipc objects that match */ |
a33e67510
|
642 643 644 645 646 647 |
if (!ctx || ctx->type != AUDIT_IPC) break; if (security_audit_rule_match(ctx->ipc.osid, f->type, f->op, f->lsm_rule, ctx)) ++result; |
6e5a2d1d3
|
648 649 |
} break; |
1da177e4c
|
650 651 652 653 654 |
case AUDIT_ARG0: case AUDIT_ARG1: case AUDIT_ARG2: case AUDIT_ARG3: if (ctx) |
93315ed6d
|
655 |
result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4c
|
656 |
break; |
5adc8a6ad
|
657 658 659 660 |
case AUDIT_FILTERKEY: /* ignore this field for filtering */ result = 1; break; |
55669bfa1
|
661 662 663 |
case AUDIT_PERM: result = audit_match_perm(ctx, f->val); break; |
8b67dca94
|
664 665 666 |
case AUDIT_FILETYPE: result = audit_match_filetype(ctx, f->val); break; |
02d86a568
|
667 668 669 |
case AUDIT_FIELD_COMPARE: result = audit_field_compare(tsk, cred, f, ctx, name); break; |
1da177e4c
|
670 |
} |
f56298835
|
671 |
if (!result) |
1da177e4c
|
672 673 |
return 0; } |
0590b9335
|
674 675 676 677 678 679 680 681 682 683 |
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; } |
1da177e4c
|
684 |
switch (rule->action) { |
66b12abc8
|
685 686 687 688 689 690 |
case AUDIT_NEVER: *state = AUDIT_DISABLED; break; case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
1da177e4c
|
691 692 693 694 695 696 697 698 |
} 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. */ |
e048e02c8
|
699 |
static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4c
|
700 701 702 703 704 |
{ struct audit_entry *e; enum audit_state state; rcu_read_lock(); |
0f45aa18e
|
705 |
list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f56298835
|
706 707 |
if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state, true)) { |
e048e02c8
|
708 709 |
if (state == AUDIT_RECORD_CONTEXT) *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); |
1da177e4c
|
710 711 712 713 714 715 716 |
rcu_read_unlock(); return state; } } rcu_read_unlock(); return AUDIT_BUILD_CONTEXT; } |
a3c549311
|
717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 |
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; } |
1da177e4c
|
732 733 |
/* 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 |
23f32d18a
|
734 |
* also not high enough that we already know we have to write an audit |
b0dd25a82
|
735 |
* record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4c
|
736 737 738 739 740 741 |
*/ static enum audit_state audit_filter_syscall(struct task_struct *tsk, struct audit_context *ctx, struct list_head *list) { struct audit_entry *e; |
c38964959
|
742 |
enum audit_state state; |
1da177e4c
|
743 |
|
351bb7225
|
744 |
if (audit_pid && tsk->tgid == audit_pid) |
f7056d64a
|
745 |
return AUDIT_DISABLED; |
1da177e4c
|
746 |
rcu_read_lock(); |
c38964959
|
747 |
if (!list_empty(list)) { |
b63862f46
|
748 |
list_for_each_entry_rcu(e, list, list) { |
a3c549311
|
749 |
if (audit_in_mask(&e->rule, ctx->major) && |
f368c07d7
|
750 |
audit_filter_rules(tsk, &e->rule, ctx, NULL, |
f56298835
|
751 |
&state, false)) { |
f368c07d7
|
752 |
rcu_read_unlock(); |
0590b9335
|
753 |
ctx->current_state = state; |
f368c07d7
|
754 755 756 757 758 759 760 |
return state; } } } rcu_read_unlock(); return AUDIT_BUILD_CONTEXT; } |
5195d8e21
|
761 762 763 764 765 766 767 |
/* * 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) { |
5195d8e21
|
768 769 770 771 |
int h = audit_hash_ino((u32)n->ino); struct list_head *list = &audit_inode_hash[h]; struct audit_entry *e; enum audit_state state; |
5195d8e21
|
772 773 774 775 |
if (list_empty(list)) return 0; list_for_each_entry_rcu(e, list, list) { |
a3c549311
|
776 |
if (audit_in_mask(&e->rule, ctx->major) && |
5195d8e21
|
777 778 779 780 781 782 783 784 785 786 |
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 |
f368c07d7
|
787 |
* collected during syscall processing. We only check rules in sublists at hash |
5195d8e21
|
788 |
* buckets applicable to the inode numbers in audit_names. |
f368c07d7
|
789 790 |
* Regarding audit_state, same rules apply as for audit_filter_syscall(). */ |
0590b9335
|
791 |
void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d7
|
792 |
{ |
5195d8e21
|
793 |
struct audit_names *n; |
f368c07d7
|
794 795 |
if (audit_pid && tsk->tgid == audit_pid) |
0590b9335
|
796 |
return; |
f368c07d7
|
797 798 |
rcu_read_lock(); |
f368c07d7
|
799 |
|
5195d8e21
|
800 801 802 |
list_for_each_entry(n, &ctx->names_list, list) { if (audit_filter_inode_name(tsk, n, ctx)) break; |
0f45aa18e
|
803 804 |
} rcu_read_unlock(); |
0f45aa18e
|
805 |
} |
4a3eb726d
|
806 807 |
/* 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, |
1da177e4c
|
808 |
int return_valid, |
6d208da89
|
809 |
long return_code) |
1da177e4c
|
810 811 |
{ struct audit_context *context = tsk->audit_context; |
56179a6ec
|
812 |
if (!context) |
1da177e4c
|
813 814 |
return NULL; context->return_valid = return_valid; |
f701b75ed
|
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 |
/* * 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; |
1da177e4c
|
833 |
|
0590b9335
|
834 835 836 |
if (context->in_syscall && !context->dummy) { audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); audit_filter_inodes(tsk, context); |
1da177e4c
|
837 |
} |
1da177e4c
|
838 839 840 |
tsk->audit_context = NULL; return context; } |
3f1c82502
|
841 842 843 844 845 846 |
static inline void audit_proctitle_free(struct audit_context *context) { kfree(context->proctitle.value); context->proctitle.value = NULL; context->proctitle.len = 0; } |
1da177e4c
|
847 848 |
static inline void audit_free_names(struct audit_context *context) { |
5195d8e21
|
849 |
struct audit_names *n, *next; |
1da177e4c
|
850 |
|
5195d8e21
|
851 852 |
list_for_each_entry_safe(n, next, &context->names_list, list) { list_del(&n->list); |
55422d0bd
|
853 854 |
if (n->name) putname(n->name); |
5195d8e21
|
855 856 |
if (n->should_free) kfree(n); |
8c8570fb8
|
857 |
} |
1da177e4c
|
858 |
context->name_count = 0; |
44707fdf5
|
859 860 861 |
path_put(&context->pwd); context->pwd.dentry = NULL; context->pwd.mnt = NULL; |
1da177e4c
|
862 863 864 865 866 867 868 869 870 871 |
} 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); } |
e54dc2431
|
872 873 874 875 |
while ((aux = context->aux_pids)) { context->aux_pids = aux->next; kfree(aux); } |
1da177e4c
|
876 |
} |
1da177e4c
|
877 878 879 |
static inline struct audit_context *audit_alloc_context(enum audit_state state) { struct audit_context *context; |
17c6ee707
|
880 881 |
context = kzalloc(sizeof(*context), GFP_KERNEL); if (!context) |
1da177e4c
|
882 |
return NULL; |
e2c5adc88
|
883 884 |
context->state = state; context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
916d75761
|
885 |
INIT_LIST_HEAD(&context->killed_trees); |
5195d8e21
|
886 |
INIT_LIST_HEAD(&context->names_list); |
1da177e4c
|
887 888 |
return context; } |
b0dd25a82
|
889 890 891 892 893 |
/** * audit_alloc - allocate an audit context block for a task * @tsk: task * * Filter on the task information and allocate a per-task audit context |
1da177e4c
|
894 895 |
* if necessary. Doing so turns on system call auditing for the * specified task. This is called from copy_process, so no lock is |
b0dd25a82
|
896 897 |
* needed. */ |
1da177e4c
|
898 899 900 901 |
int audit_alloc(struct task_struct *tsk) { struct audit_context *context; enum audit_state state; |
e048e02c8
|
902 |
char *key = NULL; |
1da177e4c
|
903 |
|
b593d384e
|
904 |
if (likely(!audit_ever_enabled)) |
1da177e4c
|
905 |
return 0; /* Return if not auditing. */ |
e048e02c8
|
906 |
state = audit_filter_task(tsk, &key); |
d48d80512
|
907 908 |
if (state == AUDIT_DISABLED) { clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); |
1da177e4c
|
909 |
return 0; |
d48d80512
|
910 |
} |
1da177e4c
|
911 912 |
if (!(context = audit_alloc_context(state))) { |
e048e02c8
|
913 |
kfree(key); |
1da177e4c
|
914 915 916 |
audit_log_lost("out of memory in audit_alloc"); return -ENOMEM; } |
e048e02c8
|
917 |
context->filterkey = key; |
1da177e4c
|
918 |
|
1da177e4c
|
919 920 921 922 923 924 925 |
tsk->audit_context = context; set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); return 0; } static inline void audit_free_context(struct audit_context *context) { |
c62d773a3
|
926 927 928 929 930 931 |
audit_free_names(context); unroll_tree_refs(context, NULL, 0); free_tree_refs(context); audit_free_aux(context); kfree(context->filterkey); kfree(context->sockaddr); |
3f1c82502
|
932 |
audit_proctitle_free(context); |
c62d773a3
|
933 |
kfree(context); |
1da177e4c
|
934 |
} |
e54dc2431
|
935 |
static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
cca080d9b
|
936 |
kuid_t auid, kuid_t uid, unsigned int sessionid, |
4746ec5b0
|
937 |
u32 sid, char *comm) |
e54dc2431
|
938 939 |
{ struct audit_buffer *ab; |
2a862b32f
|
940 |
char *ctx = NULL; |
e54dc2431
|
941 942 943 944 945 |
u32 len; int rc = 0; ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); if (!ab) |
6246ccab9
|
946 |
return rc; |
e54dc2431
|
947 |
|
e1760bd5f
|
948 949 |
audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, from_kuid(&init_user_ns, auid), |
cca080d9b
|
950 |
from_kuid(&init_user_ns, uid), sessionid); |
ad395abec
|
951 952 953 954 955 956 957 958 |
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); } |
2a862b32f
|
959 |
} |
c2a7780ef
|
960 961 |
audit_log_format(ab, " ocomm="); audit_log_untrustedstring(ab, comm); |
e54dc2431
|
962 |
audit_log_end(ab); |
e54dc2431
|
963 964 965 |
return rc; } |
43761473c
|
966 967 |
static void audit_log_execve_info(struct audit_context *context, struct audit_buffer **ab) |
bdf4c48af
|
968 |
{ |
43761473c
|
969 970 971 972 |
long len_max; long len_rem; long len_full; long len_buf; |
8443075ea
|
973 |
long len_abuf = 0; |
43761473c
|
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 |
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; |
de6bbd1d3
|
1000 |
} |
43761473c
|
1001 |
buf = buf_head; |
040b3a2df
|
1002 |
|
43761473c
|
1003 |
audit_log_format(*ab, "argc=%d", context->execve.argc); |
040b3a2df
|
1004 |
|
43761473c
|
1005 1006 1007 1008 1009 1010 1011 |
len_rem = len_max; len_buf = 0; len_full = 0; require_data = true; encode = false; iter = 0; arg = 0; |
de6bbd1d3
|
1012 |
do { |
43761473c
|
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 |
/* 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'; |
bdf4c48af
|
1061 |
|
43761473c
|
1062 1063 |
/* length of the buffer in the audit record? */ len_abuf = (encode ? len_buf * 2 : len_buf + 2); |
bdf4c48af
|
1064 |
} |
de6bbd1d3
|
1065 |
|
43761473c
|
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 |
/* 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; } |
bdf4c48af
|
1080 |
|
43761473c
|
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 |
/* 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; } |
bdf4c48af
|
1123 |
|
43761473c
|
1124 1125 1126 1127 1128 1129 1130 1131 1132 |
/* 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); |
de6bbd1d3
|
1133 |
|
43761473c
|
1134 |
/* NOTE: the caller handles the final audit_log_end() call */ |
de6bbd1d3
|
1135 |
|
43761473c
|
1136 1137 |
out: kfree(buf_head); |
bdf4c48af
|
1138 |
} |
a33e67510
|
1139 |
static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4f
|
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 |
{ 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; } |
a33e67510
|
1156 1157 |
case AUDIT_IPC: { u32 osid = context->ipc.osid; |
2570ebbd1
|
1158 |
audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
cca080d9b
|
1159 1160 1161 |
from_kuid(&init_user_ns, context->ipc.uid), from_kgid(&init_user_ns, context->ipc.gid), context->ipc.mode); |
a33e67510
|
1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 |
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); } } |
e816f370c
|
1173 1174 1175 1176 |
if (context->ipc.has_perm) { audit_log_end(ab); ab = audit_log_start(context, GFP_KERNEL, AUDIT_IPC_SET_PERM); |
0644ec0cc
|
1177 1178 |
if (unlikely(!ab)) return; |
e816f370c
|
1179 |
audit_log_format(ab, |
2570ebbd1
|
1180 |
"qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370c
|
1181 1182 1183 1184 |
context->ipc.qbytes, context->ipc.perm_uid, context->ipc.perm_gid, context->ipc.perm_mode); |
e816f370c
|
1185 |
} |
a33e67510
|
1186 |
break; } |
564f6993f
|
1187 1188 |
case AUDIT_MQ_OPEN: { audit_log_format(ab, |
df0a42837
|
1189 |
"oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993f
|
1190 1191 1192 1193 1194 1195 1196 |
"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; } |
c32c8af43
|
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 |
case AUDIT_MQ_SENDRECV: { audit_log_format(ab, "mqdes=%d msg_len=%zd msg_prio=%u " "abs_timeout_sec=%ld abs_timeout_nsec=%ld", context->mq_sendrecv.mqdes, context->mq_sendrecv.msg_len, context->mq_sendrecv.msg_prio, context->mq_sendrecv.abs_timeout.tv_sec, context->mq_sendrecv.abs_timeout.tv_nsec); break; } |
20114f71b
|
1207 1208 1209 1210 1211 |
case AUDIT_MQ_NOTIFY: { audit_log_format(ab, "mqdes=%d sigev_signo=%d", context->mq_notify.mqdes, context->mq_notify.sigev_signo); break; } |
7392906ea
|
1212 1213 1214 1215 1216 1217 1218 1219 1220 |
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; } |
57f71a0af
|
1221 1222 1223 1224 1225 1226 |
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); break; } |
120a795da
|
1227 1228 1229 1230 |
case AUDIT_MMAP: { audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, context->mmap.flags); break; } |
d9cfea91e
|
1231 1232 1233 |
case AUDIT_EXECVE: { audit_log_execve_info(context, &ab); break; } |
f3298dc4f
|
1234 1235 1236 |
} audit_log_end(ab); } |
3f1c82502
|
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 |
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); } |
e495149b1
|
1289 |
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4c
|
1290 |
{ |
9c7aa6aa7
|
1291 |
int i, call_panic = 0; |
1da177e4c
|
1292 |
struct audit_buffer *ab; |
7551ced33
|
1293 |
struct audit_aux_data *aux; |
5195d8e21
|
1294 |
struct audit_names *n; |
1da177e4c
|
1295 |
|
e495149b1
|
1296 |
/* tsk == current */ |
3f2792ffb
|
1297 |
context->personality = tsk->personality; |
e495149b1
|
1298 1299 |
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); |
1da177e4c
|
1300 1301 |
if (!ab) return; /* audit_panic has been called */ |
bccf6ae08
|
1302 1303 |
audit_log_format(ab, "arch=%x syscall=%d", context->arch, context->major); |
1da177e4c
|
1304 1305 1306 |
if (context->personality != PER_LINUX) audit_log_format(ab, " per=%lx", context->personality); if (context->return_valid) |
9f8dbe9c9
|
1307 |
audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58ba
|
1308 1309 |
(context->return_valid==AUDITSC_SUCCESS)?"yes":"no", context->return_code); |
eb84a20e9
|
1310 |
|
1da177e4c
|
1311 |
audit_log_format(ab, |
e23eb920b
|
1312 1313 1314 1315 1316 1317 |
" 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); |
eb84a20e9
|
1318 |
|
e495149b1
|
1319 |
audit_log_task_info(ab, tsk); |
9d9609851
|
1320 |
audit_log_key(ab, context->filterkey); |
1da177e4c
|
1321 |
audit_log_end(ab); |
1da177e4c
|
1322 |
|
7551ced33
|
1323 |
for (aux = context->aux; aux; aux = aux->next) { |
c04049939
|
1324 |
|
e495149b1
|
1325 |
ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4c
|
1326 1327 |
if (!ab) continue; /* audit_panic has been called */ |
1da177e4c
|
1328 |
switch (aux->type) { |
20ca73bc7
|
1329 |
|
3fc689e96
|
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 |
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, "new_pp", &axs->new_pcap.permitted); audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable); audit_log_cap(ab, "new_pe", &axs->new_pcap.effective); break; } |
1da177e4c
|
1343 1344 |
} audit_log_end(ab); |
1da177e4c
|
1345 |
} |
f3298dc4f
|
1346 |
if (context->type) |
a33e67510
|
1347 |
show_special(context, &call_panic); |
f3298dc4f
|
1348 |
|
157cf649a
|
1349 1350 1351 1352 1353 1354 1355 1356 |
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); } } |
4f6b434fe
|
1357 1358 1359 1360 1361 1362 1363 1364 1365 |
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); } } |
e54dc2431
|
1366 1367 |
for (aux = context->aux_pids; aux; aux = aux->next) { struct audit_aux_data_pids *axs = (void *)aux; |
e54dc2431
|
1368 1369 1370 |
for (i = 0; i < axs->pid_count; i++) if (audit_log_pid_context(context, axs->target_pid[i], |
c2a7780ef
|
1371 1372 |
axs->target_auid[i], axs->target_uid[i], |
4746ec5b0
|
1373 |
axs->target_sessionid[i], |
c2a7780ef
|
1374 1375 |
axs->target_sid[i], axs->target_comm[i])) |
e54dc2431
|
1376 |
call_panic = 1; |
a5cb013da
|
1377 |
} |
e54dc2431
|
1378 1379 |
if (context->target_pid && audit_log_pid_context(context, context->target_pid, |
c2a7780ef
|
1380 |
context->target_auid, context->target_uid, |
4746ec5b0
|
1381 |
context->target_sessionid, |
c2a7780ef
|
1382 |
context->target_sid, context->target_comm)) |
e54dc2431
|
1383 |
call_panic = 1; |
44707fdf5
|
1384 |
if (context->pwd.dentry && context->pwd.mnt) { |
e495149b1
|
1385 |
ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c9
|
1386 |
if (ab) { |
0b7a0fdb2
|
1387 |
audit_log_d_path(ab, "cwd=", &context->pwd); |
8f37d47c9
|
1388 1389 1390 |
audit_log_end(ab); } } |
73241ccca
|
1391 |
|
5195d8e21
|
1392 |
i = 0; |
79f6530cb
|
1393 1394 1395 |
list_for_each_entry(n, &context->names_list, list) { if (n->hidden) continue; |
b24a30a73
|
1396 |
audit_log_name(context, n, NULL, i++, &call_panic); |
79f6530cb
|
1397 |
} |
c0641f28d
|
1398 |
|
3f1c82502
|
1399 |
audit_log_proctitle(tsk, context); |
c0641f28d
|
1400 1401 1402 1403 |
/* 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); |
9c7aa6aa7
|
1404 1405 |
if (call_panic) audit_panic("error converting sid to string"); |
1da177e4c
|
1406 |
} |
b0dd25a82
|
1407 1408 1409 1410 |
/** * audit_free - free a per-task audit context * @tsk: task whose audit context block to free * |
fa84cb935
|
1411 |
* Called from copy_process and do_exit |
b0dd25a82
|
1412 |
*/ |
a4ff8dba7
|
1413 |
void __audit_free(struct task_struct *tsk) |
1da177e4c
|
1414 1415 |
{ struct audit_context *context; |
4a3eb726d
|
1416 |
context = audit_take_context(tsk, 0, 0); |
56179a6ec
|
1417 |
if (!context) |
1da177e4c
|
1418 1419 1420 |
return; /* Check for system calls that do not go through the exit |
9f8dbe9c9
|
1421 1422 |
* function (e.g., exit_group), then free context block. * We use GFP_ATOMIC here because we might be doing this |
f55619642
|
1423 |
* in the context of the idle thread */ |
e495149b1
|
1424 |
/* that can happen only if we are called from do_exit() */ |
0590b9335
|
1425 |
if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b1
|
1426 |
audit_log_exit(context, tsk); |
916d75761
|
1427 1428 |
if (!list_empty(&context->killed_trees)) audit_kill_trees(&context->killed_trees); |
1da177e4c
|
1429 1430 1431 |
audit_free_context(context); } |
b0dd25a82
|
1432 1433 |
/** * audit_syscall_entry - fill in an audit record at syscall entry |
b0dd25a82
|
1434 1435 1436 1437 1438 1439 1440 |
* @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 |
1da177e4c
|
1441 1442 1443 1444 1445 |
* 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 |
b0dd25a82
|
1446 1447 |
* be written). */ |
b4f0d3755
|
1448 1449 |
void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2, unsigned long a3, unsigned long a4) |
1da177e4c
|
1450 |
{ |
5411be59d
|
1451 |
struct task_struct *tsk = current; |
1da177e4c
|
1452 1453 |
struct audit_context *context = tsk->audit_context; enum audit_state state; |
56179a6ec
|
1454 |
if (!context) |
86a1c34a9
|
1455 |
return; |
1da177e4c
|
1456 |
|
1da177e4c
|
1457 1458 1459 1460 |
BUG_ON(context->in_syscall || context->name_count); if (!audit_enabled) return; |
4a99854c5
|
1461 |
context->arch = syscall_get_arch(); |
1da177e4c
|
1462 1463 1464 1465 1466 1467 1468 |
context->major = major; context->argv[0] = a1; context->argv[1] = a2; context->argv[2] = a3; context->argv[3] = a4; state = context->state; |
d51374adf
|
1469 |
context->dummy = !audit_n_rules; |
0590b9335
|
1470 1471 |
if (!context->dummy && state == AUDIT_BUILD_CONTEXT) { context->prio = 0; |
0f45aa18e
|
1472 |
state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
0590b9335
|
1473 |
} |
56179a6ec
|
1474 |
if (state == AUDIT_DISABLED) |
1da177e4c
|
1475 |
return; |
ce625a801
|
1476 |
context->serial = 0; |
1da177e4c
|
1477 1478 |
context->ctime = CURRENT_TIME; context->in_syscall = 1; |
0590b9335
|
1479 |
context->current_state = state; |
419c58f11
|
1480 |
context->ppid = 0; |
1da177e4c
|
1481 |
} |
b0dd25a82
|
1482 1483 |
/** * audit_syscall_exit - deallocate audit context after a system call |
42ae610c1
|
1484 1485 |
* @success: success value of the syscall * @return_code: return value of the syscall |
b0dd25a82
|
1486 1487 |
* * Tear down after system call. If the audit context has been marked as |
1da177e4c
|
1488 |
* auditable (either because of the AUDIT_RECORD_CONTEXT state from |
42ae610c1
|
1489 |
* filtering, or because some other part of the kernel wrote an audit |
1da177e4c
|
1490 |
* message), then write out the syscall information. In call cases, |
b0dd25a82
|
1491 1492 |
* free the names stored from getname(). */ |
d7e7528bc
|
1493 |
void __audit_syscall_exit(int success, long return_code) |
1da177e4c
|
1494 |
{ |
5411be59d
|
1495 |
struct task_struct *tsk = current; |
1da177e4c
|
1496 |
struct audit_context *context; |
d7e7528bc
|
1497 1498 1499 1500 |
if (success) success = AUDITSC_SUCCESS; else success = AUDITSC_FAILURE; |
1da177e4c
|
1501 |
|
4a3eb726d
|
1502 |
context = audit_take_context(tsk, success, return_code); |
56179a6ec
|
1503 |
if (!context) |
97e94c453
|
1504 |
return; |
1da177e4c
|
1505 |
|
0590b9335
|
1506 |
if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b1
|
1507 |
audit_log_exit(context, tsk); |
1da177e4c
|
1508 1509 |
context->in_syscall = 0; |
0590b9335
|
1510 |
context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
2fd6f58ba
|
1511 |
|
916d75761
|
1512 1513 |
if (!list_empty(&context->killed_trees)) audit_kill_trees(&context->killed_trees); |
c62d773a3
|
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 |
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; |
1da177e4c
|
1527 |
} |
c62d773a3
|
1528 |
tsk->audit_context = context; |
1da177e4c
|
1529 |
} |
74c3cbe33
|
1530 1531 1532 1533 1534 1535 1536 |
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; |
e61ce8673
|
1537 |
if (likely(hlist_empty(&inode->i_fsnotify_marks))) |
74c3cbe33
|
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 |
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))) { |
f952d10ff
|
1550 1551 |
pr_warn("out of memory, audit has lost a tree reference "); |
74c3cbe33
|
1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 |
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(;;) { |
3b362157b
|
1580 |
struct inode *inode = d_backing_inode(d); |
e61ce8673
|
1581 |
if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) { |
74c3cbe33
|
1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 |
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 */ |
f952d10ff
|
1610 1611 |
pr_warn("out of memory, audit has lost a tree reference "); |
74c3cbe33
|
1612 1613 1614 1615 1616 1617 1618 |
unroll_tree_refs(context, p, count); audit_set_auditable(context); return; } rcu_read_unlock(); #endif } |
78e2e802a
|
1619 1620 |
static struct audit_names *audit_alloc_name(struct audit_context *context, unsigned char type) |
5195d8e21
|
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 |
{ 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; } |
84cb777e6
|
1633 |
aname->ino = AUDIT_INO_UNSET; |
78e2e802a
|
1634 |
aname->type = type; |
5195d8e21
|
1635 1636 1637 |
list_add_tail(&aname->list, &context->names_list); context->name_count++; |
5195d8e21
|
1638 1639 |
return aname; } |
b0dd25a82
|
1640 |
/** |
7ac86265d
|
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 |
* 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; |
55422d0bd
|
1657 1658 |
if (n->name->uptr == uptr) { n->name->refcnt++; |
7ac86265d
|
1659 |
return n->name; |
55422d0bd
|
1660 |
} |
7ac86265d
|
1661 1662 1663 1664 1665 |
} return NULL; } /** |
b0dd25a82
|
1666 1667 1668 1669 1670 1671 |
* 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(). */ |
91a27b2a7
|
1672 |
void __audit_getname(struct filename *name) |
1da177e4c
|
1673 1674 |
{ struct audit_context *context = current->audit_context; |
5195d8e21
|
1675 |
struct audit_names *n; |
1da177e4c
|
1676 |
|
55422d0bd
|
1677 |
if (!context->in_syscall) |
1da177e4c
|
1678 |
return; |
91a27b2a7
|
1679 |
|
78e2e802a
|
1680 |
n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); |
5195d8e21
|
1681 1682 1683 1684 1685 |
if (!n) return; n->name = name; n->name_len = AUDIT_NAME_FULL; |
adb5c2473
|
1686 |
name->aname = n; |
55422d0bd
|
1687 |
name->refcnt++; |
5195d8e21
|
1688 |
|
f7ad3c6be
|
1689 1690 |
if (!context->pwd.dentry) get_fs_pwd(current->fs, &context->pwd); |
1da177e4c
|
1691 |
} |
b0dd25a82
|
1692 |
/** |
bfcec7087
|
1693 |
* __audit_inode - store the inode and device from a lookup |
b0dd25a82
|
1694 |
* @name: name being audited |
481968f44
|
1695 |
* @dentry: dentry being audited |
79f6530cb
|
1696 |
* @flags: attributes for this particular entry |
b0dd25a82
|
1697 |
*/ |
adb5c2473
|
1698 |
void __audit_inode(struct filename *name, const struct dentry *dentry, |
79f6530cb
|
1699 |
unsigned int flags) |
1da177e4c
|
1700 |
{ |
1da177e4c
|
1701 |
struct audit_context *context = current->audit_context; |
d6335d77a
|
1702 |
struct inode *inode = d_backing_inode(dentry); |
5195d8e21
|
1703 |
struct audit_names *n; |
79f6530cb
|
1704 |
bool parent = flags & AUDIT_INODE_PARENT; |
1da177e4c
|
1705 1706 1707 |
if (!context->in_syscall) return; |
5195d8e21
|
1708 |
|
9cec9d68a
|
1709 1710 |
if (!name) goto out_alloc; |
adb5c2473
|
1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 |
/* * 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; } } |
5195d8e21
|
1726 |
list_for_each_entry_reverse(n, &context->names_list, list) { |
57c59f583
|
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 |
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 ... */ |
bfcec7087
|
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 |
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; } |
1da177e4c
|
1749 |
} |
5195d8e21
|
1750 |
|
9cec9d68a
|
1751 |
out_alloc: |
4a9284360
|
1752 1753 |
/* unable to find an entry with both a matching name and type */ n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); |
5195d8e21
|
1754 1755 |
if (!n) return; |
fcf22d826
|
1756 |
if (name) { |
fd3522fdc
|
1757 |
n->name = name; |
55422d0bd
|
1758 |
name->refcnt++; |
fcf22d826
|
1759 |
} |
4a9284360
|
1760 |
|
5195d8e21
|
1761 |
out: |
bfcec7087
|
1762 |
if (parent) { |
91a27b2a7
|
1763 |
n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL; |
bfcec7087
|
1764 |
n->type = AUDIT_TYPE_PARENT; |
79f6530cb
|
1765 1766 |
if (flags & AUDIT_INODE_HIDDEN) n->hidden = true; |
bfcec7087
|
1767 1768 1769 1770 |
} else { n->name_len = AUDIT_NAME_FULL; n->type = AUDIT_TYPE_NORMAL; } |
74c3cbe33
|
1771 |
handle_path(dentry); |
5195d8e21
|
1772 |
audit_copy_inode(n, dentry, inode); |
73241ccca
|
1773 |
} |
9f45f5bf3
|
1774 1775 1776 1777 |
void __audit_file(const struct file *file) { __audit_inode(NULL, file->f_path.dentry, 0); } |
73241ccca
|
1778 |
/** |
c43a25abb
|
1779 |
* __audit_inode_child - collect inode info for created/removed objects |
73d3ec5ab
|
1780 |
* @parent: inode of dentry parent |
c43a25abb
|
1781 |
* @dentry: dentry being audited |
4fa6b5ecb
|
1782 |
* @type: AUDIT_TYPE_* value that we're looking for |
73241ccca
|
1783 1784 1785 1786 1787 1788 1789 1790 1791 |
* * 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. */ |
d6335d77a
|
1792 |
void __audit_inode_child(struct inode *parent, |
4fa6b5ecb
|
1793 1794 |
const struct dentry *dentry, const unsigned char type) |
73241ccca
|
1795 |
{ |
73241ccca
|
1796 |
struct audit_context *context = current->audit_context; |
d6335d77a
|
1797 |
struct inode *inode = d_backing_inode(dentry); |
cccc6bba3
|
1798 |
const char *dname = dentry->d_name.name; |
4fa6b5ecb
|
1799 |
struct audit_names *n, *found_parent = NULL, *found_child = NULL; |
73241ccca
|
1800 1801 1802 |
if (!context->in_syscall) return; |
74c3cbe33
|
1803 1804 |
if (inode) handle_one(inode); |
73241ccca
|
1805 |
|
4fa6b5ecb
|
1806 |
/* look for a parent entry first */ |
5195d8e21
|
1807 |
list_for_each_entry(n, &context->names_list, list) { |
57c59f583
|
1808 1809 1810 |
if (!n->name || (n->type != AUDIT_TYPE_PARENT && n->type != AUDIT_TYPE_UNKNOWN)) |
5712e88f2
|
1811 |
continue; |
57c59f583
|
1812 1813 1814 1815 1816 |
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; |
4fa6b5ecb
|
1817 1818 |
found_parent = n; break; |
f368c07d7
|
1819 |
} |
5712e88f2
|
1820 |
} |
73241ccca
|
1821 |
|
4fa6b5ecb
|
1822 |
/* is there a matching child entry? */ |
5195d8e21
|
1823 |
list_for_each_entry(n, &context->names_list, list) { |
4fa6b5ecb
|
1824 |
/* can only match entries that have a name */ |
57c59f583
|
1825 1826 |
if (!n->name || (n->type != type && n->type != AUDIT_TYPE_UNKNOWN)) |
5712e88f2
|
1827 |
continue; |
91a27b2a7
|
1828 1829 |
if (!strcmp(dname, n->name->name) || !audit_compare_dname_path(dname, n->name->name, |
4fa6b5ecb
|
1830 1831 |
found_parent ? found_parent->name_len : |
e3d6b07b8
|
1832 |
AUDIT_NAME_FULL)) { |
57c59f583
|
1833 1834 |
if (n->type == AUDIT_TYPE_UNKNOWN) n->type = type; |
4fa6b5ecb
|
1835 1836 |
found_child = n; break; |
5712e88f2
|
1837 |
} |
ac9910ce0
|
1838 |
} |
5712e88f2
|
1839 |
|
5712e88f2
|
1840 |
if (!found_parent) { |
4fa6b5ecb
|
1841 1842 |
/* create a new, "anonymous" parent record */ n = audit_alloc_name(context, AUDIT_TYPE_PARENT); |
5195d8e21
|
1843 |
if (!n) |
ac9910ce0
|
1844 |
return; |
5195d8e21
|
1845 |
audit_copy_inode(n, NULL, parent); |
73d3ec5ab
|
1846 |
} |
5712e88f2
|
1847 1848 |
if (!found_child) { |
4fa6b5ecb
|
1849 1850 |
found_child = audit_alloc_name(context, type); if (!found_child) |
5712e88f2
|
1851 |
return; |
5712e88f2
|
1852 1853 1854 1855 1856 |
/* 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) { |
4fa6b5ecb
|
1857 1858 |
found_child->name = found_parent->name; found_child->name_len = AUDIT_NAME_FULL; |
55422d0bd
|
1859 |
found_child->name->refcnt++; |
5712e88f2
|
1860 |
} |
5712e88f2
|
1861 |
} |
57c59f583
|
1862 |
|
4fa6b5ecb
|
1863 1864 1865 |
if (inode) audit_copy_inode(found_child, dentry, inode); else |
84cb777e6
|
1866 |
found_child->ino = AUDIT_INO_UNSET; |
3e2efce06
|
1867 |
} |
50e437d52
|
1868 |
EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce06
|
1869 1870 |
/** |
b0dd25a82
|
1871 1872 1873 1874 1875 1876 1877 |
* auditsc_get_stamp - get local copies of audit_context values * @ctx: audit_context for the task * @t: timespec to store time recorded in the audit_context * @serial: serial value that is recorded in the audit_context * * Also sets the context as auditable. */ |
48887e63d
|
1878 |
int auditsc_get_stamp(struct audit_context *ctx, |
bfb4496e7
|
1879 |
struct timespec *t, unsigned int *serial) |
1da177e4c
|
1880 |
{ |
48887e63d
|
1881 1882 |
if (!ctx->in_syscall) return 0; |
ce625a801
|
1883 1884 |
if (!ctx->serial) ctx->serial = audit_serial(); |
bfb4496e7
|
1885 1886 1887 |
t->tv_sec = ctx->ctime.tv_sec; t->tv_nsec = ctx->ctime.tv_nsec; *serial = ctx->serial; |
0590b9335
|
1888 1889 1890 1891 |
if (!ctx->prio) { ctx->prio = 1; ctx->current_state = AUDIT_RECORD_CONTEXT; } |
48887e63d
|
1892 |
return 1; |
1da177e4c
|
1893 |
} |
4746ec5b0
|
1894 1895 |
/* global counter which is incremented every time something logs in */ static atomic_t session_id = ATOMIC_INIT(0); |
da0a61049
|
1896 1897 |
static int audit_set_loginuid_perm(kuid_t loginuid) { |
da0a61049
|
1898 1899 1900 |
/* if we are unset, we don't need privs */ if (!audit_loginuid_set(current)) return 0; |
21b85c31d
|
1901 1902 1903 |
/* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/ if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE)) return -EPERM; |
83fa6bbe4
|
1904 1905 1906 |
/* it is set, you need permission */ if (!capable(CAP_AUDIT_CONTROL)) return -EPERM; |
d040e5af3
|
1907 1908 1909 |
/* 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; |
83fa6bbe4
|
1910 |
return 0; |
da0a61049
|
1911 1912 1913 1914 1915 1916 1917 |
} static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid, unsigned int oldsessionid, unsigned int sessionid, int rc) { struct audit_buffer *ab; |
5ee9a75c9
|
1918 |
uid_t uid, oldloginuid, loginuid; |
db0a6fb5d
|
1919 |
struct tty_struct *tty; |
da0a61049
|
1920 |
|
c2412d91c
|
1921 1922 |
if (!audit_enabled) return; |
76a658c20
|
1923 1924 1925 |
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); if (!ab) return; |
da0a61049
|
1926 |
uid = from_kuid(&init_user_ns, task_uid(current)); |
5ee9a75c9
|
1927 1928 |
oldloginuid = from_kuid(&init_user_ns, koldloginuid); loginuid = from_kuid(&init_user_ns, kloginuid), |
db0a6fb5d
|
1929 |
tty = audit_get_tty(current); |
da0a61049
|
1930 |
|
fa2bea2f5
|
1931 |
audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid); |
ddfad8aff
|
1932 |
audit_log_task_context(ab); |
db0a6fb5d
|
1933 1934 1935 1936 |
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); |
da0a61049
|
1937 1938 |
audit_log_end(ab); } |
b0dd25a82
|
1939 |
/** |
0a300be6d
|
1940 |
* audit_set_loginuid - set current task's audit_context loginuid |
b0dd25a82
|
1941 1942 1943 1944 1945 1946 |
* @loginuid: loginuid value * * Returns 0. * * Called (set) from fs/proc/base.c::proc_loginuid_write(). */ |
e1760bd5f
|
1947 |
int audit_set_loginuid(kuid_t loginuid) |
1da177e4c
|
1948 |
{ |
0a300be6d
|
1949 |
struct task_struct *task = current; |
9175c9d2a
|
1950 1951 |
unsigned int oldsessionid, sessionid = (unsigned int)-1; kuid_t oldloginuid; |
da0a61049
|
1952 |
int rc; |
41757106b
|
1953 |
|
da0a61049
|
1954 1955 1956 1957 1958 1959 |
oldloginuid = audit_get_loginuid(current); oldsessionid = audit_get_sessionid(current); rc = audit_set_loginuid_perm(loginuid); if (rc) goto out; |
633b45454
|
1960 |
|
81407c84a
|
1961 |
/* are we setting or clearing? */ |
833fc48d1
|
1962 |
if (uid_valid(loginuid)) { |
4440e8548
|
1963 |
sessionid = (unsigned int)atomic_inc_return(&session_id); |
833fc48d1
|
1964 1965 1966 |
if (unlikely(sessionid == (unsigned int)-1)) sessionid = (unsigned int)atomic_inc_return(&session_id); } |
bfef93a5d
|
1967 |
|
4746ec5b0
|
1968 |
task->sessionid = sessionid; |
bfef93a5d
|
1969 |
task->loginuid = loginuid; |
da0a61049
|
1970 1971 1972 |
out: audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc); return rc; |
1da177e4c
|
1973 |
} |
b0dd25a82
|
1974 |
/** |
20ca73bc7
|
1975 1976 1977 |
* __audit_mq_open - record audit data for a POSIX MQ open * @oflag: open flag * @mode: mode bits |
6b9625599
|
1978 |
* @attr: queue attributes |
20ca73bc7
|
1979 |
* |
20ca73bc7
|
1980 |
*/ |
df0a42837
|
1981 |
void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc7
|
1982 |
{ |
20ca73bc7
|
1983 |
struct audit_context *context = current->audit_context; |
564f6993f
|
1984 1985 1986 1987 |
if (attr) memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); else memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); |
20ca73bc7
|
1988 |
|
564f6993f
|
1989 1990 |
context->mq_open.oflag = oflag; context->mq_open.mode = mode; |
20ca73bc7
|
1991 |
|
564f6993f
|
1992 |
context->type = AUDIT_MQ_OPEN; |
20ca73bc7
|
1993 1994 1995 |
} /** |
c32c8af43
|
1996 |
* __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc7
|
1997 1998 1999 |
* @mqdes: MQ descriptor * @msg_len: Message length * @msg_prio: Message priority |
c32c8af43
|
2000 |
* @abs_timeout: Message timeout in absolute time |
20ca73bc7
|
2001 |
* |
20ca73bc7
|
2002 |
*/ |
c32c8af43
|
2003 2004 |
void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout) |
20ca73bc7
|
2005 |
{ |
20ca73bc7
|
2006 |
struct audit_context *context = current->audit_context; |
c32c8af43
|
2007 |
struct timespec *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc7
|
2008 |
|
c32c8af43
|
2009 2010 2011 2012 |
if (abs_timeout) memcpy(p, abs_timeout, sizeof(struct timespec)); else memset(p, 0, sizeof(struct timespec)); |
20ca73bc7
|
2013 |
|
c32c8af43
|
2014 2015 2016 |
context->mq_sendrecv.mqdes = mqdes; context->mq_sendrecv.msg_len = msg_len; context->mq_sendrecv.msg_prio = msg_prio; |
20ca73bc7
|
2017 |
|
c32c8af43
|
2018 |
context->type = AUDIT_MQ_SENDRECV; |
20ca73bc7
|
2019 2020 2021 2022 2023 |
} /** * __audit_mq_notify - record audit data for a POSIX MQ notify * @mqdes: MQ descriptor |
6b9625599
|
2024 |
* @notification: Notification event |
20ca73bc7
|
2025 |
* |
20ca73bc7
|
2026 |
*/ |
20114f71b
|
2027 |
void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc7
|
2028 |
{ |
20ca73bc7
|
2029 |
struct audit_context *context = current->audit_context; |
20114f71b
|
2030 2031 2032 2033 |
if (notification) context->mq_notify.sigev_signo = notification->sigev_signo; else context->mq_notify.sigev_signo = 0; |
20ca73bc7
|
2034 |
|
20114f71b
|
2035 2036 |
context->mq_notify.mqdes = mqdes; context->type = AUDIT_MQ_NOTIFY; |
20ca73bc7
|
2037 2038 2039 2040 2041 2042 2043 |
} /** * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute * @mqdes: MQ descriptor * @mqstat: MQ flags * |
20ca73bc7
|
2044 |
*/ |
7392906ea
|
2045 |
void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc7
|
2046 |
{ |
20ca73bc7
|
2047 |
struct audit_context *context = current->audit_context; |
7392906ea
|
2048 2049 2050 |
context->mq_getsetattr.mqdes = mqdes; context->mq_getsetattr.mqstat = *mqstat; context->type = AUDIT_MQ_GETSETATTR; |
20ca73bc7
|
2051 2052 2053 |
} /** |
073115d6b
|
2054 2055 2056 |
* audit_ipc_obj - record audit data for ipc object * @ipcp: ipc permissions * |
073115d6b
|
2057 |
*/ |
a33e67510
|
2058 |
void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6b
|
2059 |
{ |
073115d6b
|
2060 |
struct audit_context *context = current->audit_context; |
a33e67510
|
2061 2062 2063 |
context->ipc.uid = ipcp->uid; context->ipc.gid = ipcp->gid; context->ipc.mode = ipcp->mode; |
e816f370c
|
2064 |
context->ipc.has_perm = 0; |
a33e67510
|
2065 2066 |
security_ipc_getsecid(ipcp, &context->ipc.osid); context->type = AUDIT_IPC; |
073115d6b
|
2067 2068 2069 2070 |
} /** * audit_ipc_set_perm - record audit data for new ipc permissions |
b0dd25a82
|
2071 2072 2073 2074 2075 |
* @qbytes: msgq bytes * @uid: msgq user id * @gid: msgq group id * @mode: msgq mode (permissions) * |
e816f370c
|
2076 |
* Called only after audit_ipc_obj(). |
b0dd25a82
|
2077 |
*/ |
2570ebbd1
|
2078 |
void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4c
|
2079 |
{ |
1da177e4c
|
2080 |
struct audit_context *context = current->audit_context; |
e816f370c
|
2081 2082 2083 2084 2085 |
context->ipc.qbytes = qbytes; context->ipc.perm_uid = uid; context->ipc.perm_gid = gid; context->ipc.perm_mode = mode; context->ipc.has_perm = 1; |
1da177e4c
|
2086 |
} |
c2f0c7c35
|
2087 |
|
d9cfea91e
|
2088 |
void __audit_bprm(struct linux_binprm *bprm) |
473ae30bc
|
2089 |
{ |
473ae30bc
|
2090 |
struct audit_context *context = current->audit_context; |
473ae30bc
|
2091 |
|
d9cfea91e
|
2092 2093 |
context->type = AUDIT_EXECVE; context->execve.argc = bprm->argc; |
473ae30bc
|
2094 |
} |
b0dd25a82
|
2095 2096 |
/** * audit_socketcall - record audit data for sys_socketcall |
2950fa9d3
|
2097 |
* @nargs: number of args, which should not be more than AUDITSC_ARGS. |
b0dd25a82
|
2098 2099 |
* @args: args array * |
b0dd25a82
|
2100 |
*/ |
2950fa9d3
|
2101 |
int __audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fba
|
2102 |
{ |
3ec3b2fba
|
2103 |
struct audit_context *context = current->audit_context; |
2950fa9d3
|
2104 2105 |
if (nargs <= 0 || nargs > AUDITSC_ARGS || !args) return -EINVAL; |
f3298dc4f
|
2106 2107 2108 |
context->type = AUDIT_SOCKETCALL; context->socketcall.nargs = nargs; memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); |
2950fa9d3
|
2109 |
return 0; |
3ec3b2fba
|
2110 |
} |
b0dd25a82
|
2111 |
/** |
db3495099
|
2112 2113 2114 2115 |
* __audit_fd_pair - record audit data for pipe and socketpair * @fd1: the first file descriptor * @fd2: the second file descriptor * |
db3495099
|
2116 |
*/ |
157cf649a
|
2117 |
void __audit_fd_pair(int fd1, int fd2) |
db3495099
|
2118 2119 |
{ struct audit_context *context = current->audit_context; |
157cf649a
|
2120 2121 |
context->fds[0] = fd1; context->fds[1] = fd2; |
db3495099
|
2122 2123 2124 |
} /** |
b0dd25a82
|
2125 2126 2127 2128 2129 2130 |
* 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. */ |
07c494178
|
2131 |
int __audit_sockaddr(int len, void *a) |
3ec3b2fba
|
2132 |
{ |
3ec3b2fba
|
2133 |
struct audit_context *context = current->audit_context; |
4f6b434fe
|
2134 2135 2136 2137 2138 2139 |
if (!context->sockaddr) { void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); if (!p) return -ENOMEM; context->sockaddr = p; } |
3ec3b2fba
|
2140 |
|
4f6b434fe
|
2141 2142 |
context->sockaddr_len = len; memcpy(context->sockaddr, a, len); |
3ec3b2fba
|
2143 2144 |
return 0; } |
a5cb013da
|
2145 2146 2147 |
void __audit_ptrace(struct task_struct *t) { struct audit_context *context = current->audit_context; |
fa2bea2f5
|
2148 |
context->target_pid = task_tgid_nr(t); |
c2a7780ef
|
2149 |
context->target_auid = audit_get_loginuid(t); |
c69e8d9c0
|
2150 |
context->target_uid = task_uid(t); |
4746ec5b0
|
2151 |
context->target_sessionid = audit_get_sessionid(t); |
2a862b32f
|
2152 |
security_task_getsecid(t, &context->target_sid); |
c2a7780ef
|
2153 |
memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013da
|
2154 |
} |
b0dd25a82
|
2155 |
/** |
b0dd25a82
|
2156 2157 2158 2159 2160 2161 2162 |
* 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. */ |
e54dc2431
|
2163 |
int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c35
|
2164 |
{ |
e54dc2431
|
2165 2166 2167 |
struct audit_aux_data_pids *axp; struct task_struct *tsk = current; struct audit_context *ctx = tsk->audit_context; |
cca080d9b
|
2168 |
kuid_t uid = current_uid(), t_uid = task_uid(t); |
e1396065e
|
2169 |
|
175fc4842
|
2170 |
if (audit_pid && t->tgid == audit_pid) { |
ee1d31566
|
2171 |
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) { |
fa2bea2f5
|
2172 |
audit_sig_pid = task_tgid_nr(tsk); |
e1760bd5f
|
2173 |
if (uid_valid(tsk->loginuid)) |
bfef93a5d
|
2174 |
audit_sig_uid = tsk->loginuid; |
175fc4842
|
2175 |
else |
c69e8d9c0
|
2176 |
audit_sig_uid = uid; |
2a862b32f
|
2177 |
security_task_getsecid(tsk, &audit_sig_sid); |
175fc4842
|
2178 2179 2180 |
} if (!audit_signals || audit_dummy_context()) return 0; |
c2f0c7c35
|
2181 |
} |
e54dc2431
|
2182 |
|
e54dc2431
|
2183 2184 2185 |
/* optimize the common case by putting first signal recipient directly * in audit_context */ if (!ctx->target_pid) { |
f1dc4867f
|
2186 |
ctx->target_pid = task_tgid_nr(t); |
c2a7780ef
|
2187 |
ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c0
|
2188 |
ctx->target_uid = t_uid; |
4746ec5b0
|
2189 |
ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32f
|
2190 |
security_task_getsecid(t, &ctx->target_sid); |
c2a7780ef
|
2191 |
memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc2431
|
2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 |
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; } |
88ae704c2
|
2205 |
BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc2431
|
2206 |
|
f1dc4867f
|
2207 |
axp->target_pid[axp->pid_count] = task_tgid_nr(t); |
c2a7780ef
|
2208 |
axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c0
|
2209 |
axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b0
|
2210 |
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32f
|
2211 |
security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780ef
|
2212 |
memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc2431
|
2213 2214 2215 |
axp->pid_count++; return 0; |
c2f0c7c35
|
2216 |
} |
0a4ff8c25
|
2217 2218 |
/** |
3fc689e96
|
2219 |
* __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps |
d84f4f992
|
2220 2221 2222 |
* @bprm: pointer to the bprm being processed * @new: the proposed new credentials * @old: the old credentials |
3fc689e96
|
2223 2224 2225 2226 |
* * 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 * |
3fc689e96
|
2227 2228 |
* -Eric */ |
d84f4f992
|
2229 2230 |
int __audit_log_bprm_fcaps(struct linux_binprm *bprm, const struct cred *new, const struct cred *old) |
3fc689e96
|
2231 2232 2233 2234 |
{ struct audit_aux_data_bprm_fcaps *ax; struct audit_context *context = current->audit_context; struct cpu_vfs_cap_data vcaps; |
3fc689e96
|
2235 2236 2237 |
ax = kmalloc(sizeof(*ax), GFP_KERNEL); if (!ax) |
d84f4f992
|
2238 |
return -ENOMEM; |
3fc689e96
|
2239 2240 2241 2242 |
ax->d.type = AUDIT_BPRM_FCAPS; ax->d.next = context->aux; context->aux = (void *)ax; |
f4a4a8b12
|
2243 |
get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps); |
3fc689e96
|
2244 2245 2246 2247 2248 |
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; |
d84f4f992
|
2249 2250 2251 |
ax->old_pcap.permitted = old->cap_permitted; ax->old_pcap.inheritable = old->cap_inheritable; ax->old_pcap.effective = old->cap_effective; |
3fc689e96
|
2252 |
|
d84f4f992
|
2253 2254 2255 2256 |
ax->new_pcap.permitted = new->cap_permitted; ax->new_pcap.inheritable = new->cap_inheritable; ax->new_pcap.effective = new->cap_effective; return 0; |
3fc689e96
|
2257 2258 2259 |
} /** |
e68b75a02
|
2260 |
* __audit_log_capset - store information about the arguments to the capset syscall |
d84f4f992
|
2261 2262 |
* @new: the new credentials * @old: the old (current) credentials |
e68b75a02
|
2263 |
* |
da3dae54e
|
2264 |
* Record the arguments userspace sent to sys_capset for later printing by the |
e68b75a02
|
2265 2266 |
* audit system if applicable */ |
ca24a23eb
|
2267 |
void __audit_log_capset(const struct cred *new, const struct cred *old) |
e68b75a02
|
2268 |
{ |
e68b75a02
|
2269 |
struct audit_context *context = current->audit_context; |
fa2bea2f5
|
2270 |
context->capset.pid = task_tgid_nr(current); |
57f71a0af
|
2271 2272 2273 2274 |
context->capset.cap.effective = new->cap_effective; context->capset.cap.inheritable = new->cap_effective; context->capset.cap.permitted = new->cap_permitted; context->type = AUDIT_CAPSET; |
e68b75a02
|
2275 |
} |
120a795da
|
2276 2277 2278 2279 2280 2281 2282 |
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; } |
7b9205bd7
|
2283 |
static void audit_log_task(struct audit_buffer *ab) |
85e7bac33
|
2284 |
{ |
cca080d9b
|
2285 2286 |
kuid_t auid, uid; kgid_t gid; |
85e7bac33
|
2287 |
unsigned int sessionid; |
9eab339b1
|
2288 |
char comm[sizeof(current->comm)]; |
85e7bac33
|
2289 2290 2291 2292 2293 2294 |
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", |
cca080d9b
|
2295 2296 2297 2298 |
from_kuid(&init_user_ns, auid), from_kuid(&init_user_ns, uid), from_kgid(&init_user_ns, gid), sessionid); |
85e7bac33
|
2299 |
audit_log_task_context(ab); |
fa2bea2f5
|
2300 |
audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); |
9eab339b1
|
2301 |
audit_log_untrustedstring(ab, get_task_comm(comm, current)); |
4766b199e
|
2302 |
audit_log_d_path_exe(ab, current->mm); |
7b9205bd7
|
2303 |
} |
e68b75a02
|
2304 |
/** |
0a4ff8c25
|
2305 |
* audit_core_dumps - record information about processes that end abnormally |
6d9525b52
|
2306 |
* @signr: signal value |
0a4ff8c25
|
2307 2308 2309 2310 2311 2312 2313 |
* * 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; |
0a4ff8c25
|
2314 2315 2316 2317 2318 2319 2320 2321 |
if (!audit_enabled) return; if (signr == SIGQUIT) /* don't care for those */ return; ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); |
0644ec0cc
|
2322 2323 |
if (unlikely(!ab)) return; |
61c0ee879
|
2324 2325 |
audit_log_task(ab); audit_log_format(ab, " sig=%ld", signr); |
85e7bac33
|
2326 2327 |
audit_log_end(ab); } |
0a4ff8c25
|
2328 |
|
3dc1c1b2d
|
2329 |
void __audit_seccomp(unsigned long syscall, long signr, int code) |
85e7bac33
|
2330 2331 |
{ struct audit_buffer *ab; |
7b9205bd7
|
2332 2333 2334 2335 |
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP); if (unlikely(!ab)) return; audit_log_task(ab); |
84db564aa
|
2336 |
audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x", |
efbc0fbf3
|
2337 2338 |
signr, syscall_get_arch(), syscall, in_compat_syscall(), KSTK_EIP(current), code); |
0a4ff8c25
|
2339 2340 |
audit_log_end(ab); } |
916d75761
|
2341 2342 2343 2344 2345 2346 2347 2348 |
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; } |