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fanotify,audit: Allow audit to use the full permission event response

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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 <paul@paul-moore.com>.

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 <sgrubb@redhat.com>
Link: https://lore.kernel.org/r/3075502.aeNJFYEL58@x2
Tested-by: Steve Grubb <sgrubb@redhat.com>
Acked-by: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <bcb6d552e517b8751ece153e516d8b073459069c.1675373475.git.rgb@redhat.com>
This commit is contained in:
Richard Guy Briggs 2023-02-03 16:35:16 -05:00 committed by Jan Kara
parent 70529a1995
commit 032bffd494
3 changed files with 22 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/notify/fanotify/fanotify.c
View File

@ -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);

9
include/linux/audit.h
View File

@ -14,6 +14,7 @@
#include <linux/audit_arch.h>
#include <uapi/linux/audit.h>
#include <uapi/linux/netfilter/nf_tables.h>
#include <uapi/linux/fanotify.h>
#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)

18
kernel/auditsc.c
View File

@ -64,6 +64,7 @@
#include <uapi/linux/limits.h>
#include <uapi/linux/netfilter/nf_tables.h>
#include <uapi/linux/openat2.h> // struct open_how
#include <uapi/linux/fanotify.h>
#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)