From patchwork Fri Feb 3 21:35:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Guy Briggs X-Patchwork-Id: 13128416 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0320C05027 for ; Fri, 3 Feb 2023 21:36:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233781AbjBCVgY (ORCPT ); Fri, 3 Feb 2023 16:36:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41308 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233150AbjBCVgW (ORCPT ); Fri, 3 Feb 2023 16:36:22 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3BD26A58ED for ; Fri, 3 Feb 2023 13:35:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675460139; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=yodz909gQLcsaRT2R9pZz/clnDYmt0URiuiWmBb/3AM=; b=ObQYSpnNC5nAYGzWXcxWvuC//ImQ9+udE6kKnXZ8dpzm/wmENZE7SZdzGv4eNGipOIn3mp njVotFkZZOmVFJ+WTxtWqDKnt2IEW0CxWZBVh4lwz9xAKl6e+dvRGqkGEHD9+GFX0+3KmP Y6UbwKI+GE0ZznmWmdCcGtyDJqm4HjM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-126-Nol1wclAOWakrkcCYDgbxA-1; Fri, 03 Feb 2023 16:35:38 -0500 X-MC-Unique: Nol1wclAOWakrkcCYDgbxA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 72D821800077; Fri, 3 Feb 2023 21:35:37 +0000 (UTC) Received: from madcap2.tricolour.com (unknown [10.22.50.7]) by smtp.corp.redhat.com (Postfix) with ESMTP id F199240CF8EA; Fri, 3 Feb 2023 21:35:35 +0000 (UTC) From: Richard Guy Briggs To: Linux-Audit Mailing List , LKML , linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Cc: Paul Moore , Eric Paris , Steve Grubb , Richard Guy Briggs , Jan Kara , Amir Goldstein Subject: [PATCH v7 1/3] fanotify: Ensure consistent variable type for response Date: Fri, 3 Feb 2023 16:35:14 -0500 Message-Id: <3778cb0b3501bc4e686ba7770b20eb9ab0506cf4.1675373475.git.rgb@redhat.com> In-Reply-To: References: MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org The user space API for the response variable is __u32. This patch makes sure that the whole path through the kernel uses u32 so that there is no sign extension or truncation of the user space response. Suggested-by: Steve Grubb Link: https://lore.kernel.org/r/12617626.uLZWGnKmhe@x2 Signed-off-by: Richard Guy Briggs Acked-by: Paul Moore --- fs/notify/fanotify/fanotify.h | 2 +- fs/notify/fanotify/fanotify_user.c | 6 +++--- include/linux/audit.h | 6 +++--- kernel/auditsc.c | 2 +- 4 files changed, 8 insertions(+), 8 deletions(-) diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h index 57f51a9a3015..f899d610bc08 100644 --- a/fs/notify/fanotify/fanotify.h +++ b/fs/notify/fanotify/fanotify.h @@ -425,7 +425,7 @@ FANOTIFY_PE(struct fanotify_event *event) struct fanotify_perm_event { struct fanotify_event fae; struct path path; - unsigned short response; /* userspace answer to the event */ + u32 response; /* userspace answer to the event */ unsigned short state; /* state of the event */ int fd; /* fd we passed to userspace for this event */ }; diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index 4546da4a54f9..caa1211bac8c 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -289,7 +289,7 @@ static int create_fd(struct fsnotify_group *group, const struct path *path, */ static void finish_permission_event(struct fsnotify_group *group, struct fanotify_perm_event *event, - unsigned int response) + u32 response) __releases(&group->notification_lock) { bool destroy = false; @@ -310,9 +310,9 @@ static int process_access_response(struct fsnotify_group *group, { struct fanotify_perm_event *event; int fd = response_struct->fd; - int response = response_struct->response; + u32 response = response_struct->response; - pr_debug("%s: group=%p fd=%d response=%d\n", __func__, group, + pr_debug("%s: group=%p fd=%d response=%u\n", __func__, group, fd, response); /* * make sure the response is valid, if invalid we do nothing and either diff --git a/include/linux/audit.h b/include/linux/audit.h index 3608992848d3..d6b7d0c7ce43 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -416,7 +416,7 @@ extern void __audit_log_capset(const struct cred *new, const struct cred *old); extern void __audit_mmap_fd(int fd, int flags); extern void __audit_openat2_how(struct open_how *how); extern void __audit_log_kern_module(char *name); -extern void __audit_fanotify(unsigned int response); +extern void __audit_fanotify(u32 response); extern void __audit_tk_injoffset(struct timespec64 offset); extern void __audit_ntp_log(const struct audit_ntp_data *ad); extern void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries, @@ -523,7 +523,7 @@ static inline void audit_log_kern_module(char *name) __audit_log_kern_module(name); } -static inline void audit_fanotify(unsigned int response) +static inline void audit_fanotify(u32 response) { if (!audit_dummy_context()) __audit_fanotify(response); @@ -679,7 +679,7 @@ static inline void audit_log_kern_module(char *name) { } -static inline void audit_fanotify(unsigned int response) +static inline void audit_fanotify(u32 response) { } static inline void audit_tk_injoffset(struct timespec64 offset) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 547c88be8a28..d1fb821de104 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -2877,7 +2877,7 @@ void __audit_log_kern_module(char *name) context->type = AUDIT_KERN_MODULE; } -void __audit_fanotify(unsigned int response) +void __audit_fanotify(u32 response) { audit_log(audit_context(), GFP_KERNEL, AUDIT_FANOTIFY, "resp=%u", response); From patchwork Fri Feb 3 21:35:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Guy Briggs X-Patchwork-Id: 13128419 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C880C05027 for ; Fri, 3 Feb 2023 21:37:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233343AbjBCVhP (ORCPT ); Fri, 3 Feb 2023 16:37:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41386 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233150AbjBCVhM (ORCPT ); Fri, 3 Feb 2023 16:37:12 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90391A7ECD for ; Fri, 3 Feb 2023 13:35:43 -0800 (PST) DKIM-Signature: v=1; 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Fri, 3 Feb 2023 21:35:39 +0000 (UTC) Received: from madcap2.tricolour.com (unknown [10.22.50.7]) by smtp.corp.redhat.com (Postfix) with ESMTP id AE409400F756; Fri, 3 Feb 2023 21:35:37 +0000 (UTC) From: Richard Guy Briggs To: Linux-Audit Mailing List , LKML , linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Cc: Paul Moore , Eric Paris , Steve Grubb , Richard Guy Briggs , Jan Kara , Amir Goldstein Subject: [PATCH v7 2/3] fanotify: define struct members to hold response decision context Date: Fri, 3 Feb 2023 16:35:15 -0500 Message-Id: <10177cfcae5480926b7176321a28d9da6835b667.1675373475.git.rgb@redhat.com> In-Reply-To: References: MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This patch adds a flag, FAN_INFO and an extensible buffer to provide additional information about response decisions. The buffer contains one or more headers defining the information type and the length of the following information. The patch defines one additional information type, FAN_RESPONSE_INFO_AUDIT_RULE, to audit a rule number. This will allow for the creation of other information types in the future if other users of the API identify different needs. The kernel can be tested if it supports a given info type by supplying the complete info extension but setting fd to FAN_NOFD. It will return the expected size but not issue an audit record. Suggested-by: Steve Grubb Link: https://lore.kernel.org/r/2745105.e9J7NaK4W3@x2 Suggested-by: Jan Kara Link: https://lore.kernel.org/r/20201001101219.GE17860@quack2.suse.cz Signed-off-by: Richard Guy Briggs --- fs/notify/fanotify/fanotify.c | 5 +- fs/notify/fanotify/fanotify.h | 4 ++ fs/notify/fanotify/fanotify_user.c | 86 ++++++++++++++++++++++-------- include/linux/fanotify.h | 5 ++ include/uapi/linux/fanotify.h | 30 ++++++++++- 5 files changed, 107 insertions(+), 23 deletions(-) diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c index a2a15bc4df28..24ec1d66d5a8 100644 --- a/fs/notify/fanotify/fanotify.c +++ b/fs/notify/fanotify/fanotify.c @@ -262,7 +262,7 @@ static int fanotify_get_response(struct fsnotify_group *group, } /* userspace responded, convert to something usable */ - switch (event->response & ~FAN_AUDIT) { + switch (event->response & FANOTIFY_RESPONSE_ACCESS) { case FAN_ALLOW: ret = 0; break; @@ -563,6 +563,9 @@ static struct fanotify_event *fanotify_alloc_perm_event(const struct path *path, pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH_PERM; pevent->response = 0; + pevent->hdr.type = FAN_RESPONSE_INFO_NONE; + pevent->hdr.pad = 0; + pevent->hdr.len = 0; pevent->state = FAN_EVENT_INIT; pevent->path = *path; path_get(path); diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h index f899d610bc08..e8a3c28c5d12 100644 --- a/fs/notify/fanotify/fanotify.h +++ b/fs/notify/fanotify/fanotify.h @@ -428,6 +428,10 @@ struct fanotify_perm_event { u32 response; /* userspace answer to the event */ unsigned short state; /* state of the event */ int fd; /* fd we passed to userspace for this event */ + union { + struct fanotify_response_info_header hdr; + struct fanotify_response_info_audit_rule audit_rule; + }; }; static inline struct fanotify_perm_event * diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index caa1211bac8c..8f430bfad487 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -283,19 +283,42 @@ static int create_fd(struct fsnotify_group *group, const struct path *path, return client_fd; } +static int process_access_response_info(const char __user *info, + size_t info_len, + struct fanotify_response_info_audit_rule *friar) +{ + if (info_len != sizeof(*friar)) + return -EINVAL; + + if (copy_from_user(friar, info, sizeof(*friar))) + return -EFAULT; + + if (friar->hdr.type != FAN_RESPONSE_INFO_AUDIT_RULE) + return -EINVAL; + if (friar->hdr.pad != 0) + return -EINVAL; + if (friar->hdr.len != sizeof(*friar)) + return -EINVAL; + + return info_len; +} + /* * Finish processing of permission event by setting it to ANSWERED state and * drop group->notification_lock. */ static void finish_permission_event(struct fsnotify_group *group, - struct fanotify_perm_event *event, - u32 response) + struct fanotify_perm_event *event, u32 response, + struct fanotify_response_info_audit_rule *friar) __releases(&group->notification_lock) { bool destroy = false; assert_spin_locked(&group->notification_lock); - event->response = response; + event->response = response & ~FAN_INFO; + if (response & FAN_INFO) + memcpy(&event->audit_rule, friar, sizeof(*friar)); + if (event->state == FAN_EVENT_CANCELED) destroy = true; else @@ -306,20 +329,27 @@ static void finish_permission_event(struct fsnotify_group *group, } static int process_access_response(struct fsnotify_group *group, - struct fanotify_response *response_struct) + struct fanotify_response *response_struct, + const char __user *info, + size_t info_len) { struct fanotify_perm_event *event; int fd = response_struct->fd; u32 response = response_struct->response; + int ret = info_len; + struct fanotify_response_info_audit_rule friar; - pr_debug("%s: group=%p fd=%d response=%u\n", __func__, group, - fd, response); + pr_debug("%s: group=%p fd=%d response=%u buf=%p size=%zu\n", __func__, + group, fd, response, info, info_len); /* * make sure the response is valid, if invalid we do nothing and either * userspace can send a valid response or we will clean it up after the * timeout */ - switch (response & ~FAN_AUDIT) { + if (response & ~FANOTIFY_RESPONSE_VALID_MASK) + return -EINVAL; + + switch (response & FANOTIFY_RESPONSE_ACCESS) { case FAN_ALLOW: case FAN_DENY: break; @@ -327,10 +357,20 @@ static int process_access_response(struct fsnotify_group *group, return -EINVAL; } - if (fd < 0) + if ((response & FAN_AUDIT) && !FAN_GROUP_FLAG(group, FAN_ENABLE_AUDIT)) return -EINVAL; - if ((response & FAN_AUDIT) && !FAN_GROUP_FLAG(group, FAN_ENABLE_AUDIT)) + if (response & FAN_INFO) { + ret = process_access_response_info(info, info_len, &friar); + if (ret < 0) + return ret; + if (fd == FAN_NOFD) + return ret; + } else { + ret = 0; + } + + if (fd < 0) return -EINVAL; spin_lock(&group->notification_lock); @@ -340,9 +380,9 @@ static int process_access_response(struct fsnotify_group *group, continue; list_del_init(&event->fae.fse.list); - finish_permission_event(group, event, response); + finish_permission_event(group, event, response, &friar); wake_up(&group->fanotify_data.access_waitq); - return 0; + return ret; } spin_unlock(&group->notification_lock); @@ -804,7 +844,7 @@ static ssize_t fanotify_read(struct file *file, char __user *buf, if (ret <= 0) { spin_lock(&group->notification_lock); finish_permission_event(group, - FANOTIFY_PERM(event), FAN_DENY); + FANOTIFY_PERM(event), FAN_DENY, NULL); wake_up(&group->fanotify_data.access_waitq); } else { spin_lock(&group->notification_lock); @@ -827,28 +867,32 @@ static ssize_t fanotify_read(struct file *file, char __user *buf, static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) { - struct fanotify_response response = { .fd = -1, .response = -1 }; + struct fanotify_response response; struct fsnotify_group *group; int ret; + const char __user *info_buf = buf + sizeof(struct fanotify_response); + size_t info_len; if (!IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) return -EINVAL; group = file->private_data; + pr_debug("%s: group=%p count=%zu\n", __func__, group, count); + if (count < sizeof(response)) return -EINVAL; - count = sizeof(response); - - pr_debug("%s: group=%p count=%zu\n", __func__, group, count); - - if (copy_from_user(&response, buf, count)) + if (copy_from_user(&response, buf, sizeof(response))) return -EFAULT; - ret = process_access_response(group, &response); + info_len = count - sizeof(response); + + ret = process_access_response(group, &response, info_buf, info_len); if (ret < 0) count = ret; + else + count = sizeof(response) + ret; return count; } @@ -876,7 +920,7 @@ static int fanotify_release(struct inode *ignored, struct file *file) event = list_first_entry(&group->fanotify_data.access_list, struct fanotify_perm_event, fae.fse.list); list_del_init(&event->fae.fse.list); - finish_permission_event(group, event, FAN_ALLOW); + finish_permission_event(group, event, FAN_ALLOW, NULL); spin_lock(&group->notification_lock); } @@ -893,7 +937,7 @@ static int fanotify_release(struct inode *ignored, struct file *file) fsnotify_destroy_event(group, fsn_event); } else { finish_permission_event(group, FANOTIFY_PERM(event), - FAN_ALLOW); + FAN_ALLOW, NULL); } spin_lock(&group->notification_lock); } diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h index 8ad743def6f3..4f1c4f603118 100644 --- a/include/linux/fanotify.h +++ b/include/linux/fanotify.h @@ -122,6 +122,11 @@ #define ALL_FANOTIFY_EVENT_BITS (FANOTIFY_OUTGOING_EVENTS | \ FANOTIFY_EVENT_FLAGS) +/* These masks check for invalid bits in permission responses. */ +#define FANOTIFY_RESPONSE_ACCESS (FAN_ALLOW | FAN_DENY) +#define FANOTIFY_RESPONSE_FLAGS (FAN_AUDIT | FAN_INFO) +#define FANOTIFY_RESPONSE_VALID_MASK (FANOTIFY_RESPONSE_ACCESS | FANOTIFY_RESPONSE_FLAGS) + /* Do not use these old uapi constants internally */ #undef FAN_ALL_CLASS_BITS #undef FAN_ALL_INIT_FLAGS diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h index 436258214bb0..cd14c94e9a1e 100644 --- a/include/uapi/linux/fanotify.h +++ b/include/uapi/linux/fanotify.h @@ -188,15 +188,43 @@ struct fanotify_event_info_error { __u32 error_count; }; +/* + * User space may need to record additional information about its decision. + * The extra information type records what kind of information is included. + * The default is none. We also define an extra information buffer whose + * size is determined by the extra information type. + * + * If the information type is Audit Rule, then the information following + * is the rule number that triggered the user space decision that + * requires auditing. + */ + +#define FAN_RESPONSE_INFO_NONE 0 +#define FAN_RESPONSE_INFO_AUDIT_RULE 1 + struct fanotify_response { __s32 fd; __u32 response; }; +struct fanotify_response_info_header { + __u8 type; + __u8 pad; + __u16 len; +}; + +struct fanotify_response_info_audit_rule { + struct fanotify_response_info_header hdr; + __u32 rule_number; + __u32 subj_trust; + __u32 obj_trust; +}; + /* Legit userspace responses to a _PERM event */ #define FAN_ALLOW 0x01 #define FAN_DENY 0x02 -#define FAN_AUDIT 0x10 /* Bit mask to create audit record for result */ +#define FAN_AUDIT 0x10 /* Bitmask to create audit record for result */ +#define FAN_INFO 0x20 /* Bitmask to indicate additional information */ /* No fd set in event */ #define FAN_NOFD -1 From patchwork Fri Feb 3 21:35:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Guy Briggs X-Patchwork-Id: 13128418 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A8FFC61DA4 for ; Fri, 3 Feb 2023 21:37:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233664AbjBCVhO (ORCPT ); Fri, 3 Feb 2023 16:37:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41392 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233250AbjBCVhM (ORCPT ); Fri, 3 Feb 2023 16:37:12 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 960E5A8429 for ; Fri, 3 Feb 2023 13:35:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675460145; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WTWZ2Ef2CfyxEGVxp7yzT3b+CQOijHFN2HB2ijuK9AA=; b=DucWH364pwOChSzp+F1mZeWD5xT/f76WF+vFZo+gamXSlfPkLNPeEgp6unlezE/iuHT8Rv nc1tlANAfgCbGToWL/HD19m9M5IwNYohpT8jmqUfQ1dEwTKw010PKpaR6AxqW9siy/Q0Hp odhSAvdw+MiyDgDPYgHmhByfR3ESmxU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-13-dddXBdJWPGu1O0UyFFjw0w-1; Fri, 03 Feb 2023 16:35:42 -0500 X-MC-Unique: dddXBdJWPGu1O0UyFFjw0w-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 4AF533815F77; Fri, 3 Feb 2023 21:35:41 +0000 (UTC) Received: from madcap2.tricolour.com (unknown [10.22.50.7]) by smtp.corp.redhat.com (Postfix) with ESMTP id 65280400F756; Fri, 3 Feb 2023 21:35:39 +0000 (UTC) From: Richard Guy Briggs To: Linux-Audit Mailing List , LKML , linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Cc: Paul Moore , Eric Paris , Steve Grubb , Richard Guy Briggs , Jan Kara , Amir Goldstein Subject: [PATCH v7 3/3] fanotify,audit: Allow audit to use the full permission event response Date: Fri, 3 Feb 2023 16:35:16 -0500 Message-Id: In-Reply-To: References: MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This patch passes the full response so that the audit function can use all of it. The audit function was updated to log the additional information in the AUDIT_FANOTIFY record. Currently the only type of fanotify info that is defined is an audit rule number, but convert it to hex encoding to future-proof the field. Hex encoding suggested by Paul Moore . The {subj,obj}_trust values are {0,1,2}, corresponding to no, yes, unknown. Sample records: type=FANOTIFY msg=audit(1600385147.372:590): resp=2 fan_type=1 fan_info=3137 subj_trust=3 obj_trust=5 type=FANOTIFY msg=audit(1659730979.839:284): resp=1 fan_type=0 fan_info=0 subj_trust=2 obj_trust=2 Suggested-by: Steve Grubb Link: https://lore.kernel.org/r/3075502.aeNJFYEL58@x2 Signed-off-by: Richard Guy Briggs --- fs/notify/fanotify/fanotify.c | 3 ++- include/linux/audit.h | 9 +++++---- kernel/auditsc.c | 18 +++++++++++++++--- 3 files changed, 22 insertions(+), 8 deletions(-) diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c index 24ec1d66d5a8..29bdd99b29fa 100644 --- a/fs/notify/fanotify/fanotify.c +++ b/fs/notify/fanotify/fanotify.c @@ -273,7 +273,8 @@ static int fanotify_get_response(struct fsnotify_group *group, /* Check if the response should be audited */ if (event->response & FAN_AUDIT) - audit_fanotify(event->response & ~FAN_AUDIT); + audit_fanotify(event->response & ~FAN_AUDIT, + &event->audit_rule); pr_debug("%s: group=%p event=%p about to return ret=%d\n", __func__, group, event, ret); diff --git a/include/linux/audit.h b/include/linux/audit.h index d6b7d0c7ce43..31086a72e32a 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -14,6 +14,7 @@ #include #include #include +#include #define AUDIT_INO_UNSET ((unsigned long)-1) #define AUDIT_DEV_UNSET ((dev_t)-1) @@ -416,7 +417,7 @@ extern void __audit_log_capset(const struct cred *new, const struct cred *old); extern void __audit_mmap_fd(int fd, int flags); extern void __audit_openat2_how(struct open_how *how); extern void __audit_log_kern_module(char *name); -extern void __audit_fanotify(u32 response); +extern void __audit_fanotify(u32 response, struct fanotify_response_info_audit_rule *friar); extern void __audit_tk_injoffset(struct timespec64 offset); extern void __audit_ntp_log(const struct audit_ntp_data *ad); extern void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries, @@ -523,10 +524,10 @@ static inline void audit_log_kern_module(char *name) __audit_log_kern_module(name); } -static inline void audit_fanotify(u32 response) +static inline void audit_fanotify(u32 response, struct fanotify_response_info_audit_rule *friar) { if (!audit_dummy_context()) - __audit_fanotify(response); + __audit_fanotify(response, friar); } static inline void audit_tk_injoffset(struct timespec64 offset) @@ -679,7 +680,7 @@ static inline void audit_log_kern_module(char *name) { } -static inline void audit_fanotify(u32 response) +static inline void audit_fanotify(u32 response, struct fanotify_response_info_audit_rule *friar) { } static inline void audit_tk_injoffset(struct timespec64 offset) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index d1fb821de104..5a5994659b44 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -64,6 +64,7 @@ #include #include #include // struct open_how +#include #include "audit.h" @@ -2877,10 +2878,21 @@ void __audit_log_kern_module(char *name) context->type = AUDIT_KERN_MODULE; } -void __audit_fanotify(u32 response) +void __audit_fanotify(u32 response, struct fanotify_response_info_audit_rule *friar) { - audit_log(audit_context(), GFP_KERNEL, - AUDIT_FANOTIFY, "resp=%u", response); + /* {subj,obj}_trust values are {0,1,2}: no,yes,unknown */ + switch (friar->hdr.type) { + case FAN_RESPONSE_INFO_NONE: + audit_log(audit_context(), GFP_KERNEL, AUDIT_FANOTIFY, + "resp=%u fan_type=%u fan_info=0 subj_trust=2 obj_trust=2", + response, FAN_RESPONSE_INFO_NONE); + break; + case FAN_RESPONSE_INFO_AUDIT_RULE: + audit_log(audit_context(), GFP_KERNEL, AUDIT_FANOTIFY, + "resp=%u fan_type=%u fan_info=%X subj_trust=%u obj_trust=%u", + response, friar->hdr.type, friar->rule_number, + friar->subj_trust, friar->obj_trust); + } } void __audit_tk_injoffset(struct timespec64 offset)