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selinux: log anon inode class name

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Log the anonymous inode class name in the security hook
inode_init_security_anon.  This name is the key for name based type
transitions on the anon_inode security class on creation.  Example:

    type=AVC msg=audit(02/16/22 22:02:50.585:216) : avc:  granted \
        { create } for  pid=2136 comm=mariadbd anonclass=[io_uring] \
        scontext=system_u:system_r:mysqld_t:s0 \
        tcontext=system_u:system_r:mysqld_iouring_t:s0 tclass=anon_inode

Add a new LSM audit data type holding the inode and the class name.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: adjusted 'anonclass' to be a trusted string, cgzones approved]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Christian Göttsche 2022-03-08 18:09:26 +01:00 committed by Paul Moore
parent ded34574d4
commit c29722fad4
3 changed files with 7 additions and 2 deletions
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2
include/linux/lsm_audit.h
View file

@ -76,6 +76,7 @@ struct common_audit_data {
#define LSM_AUDIT_DATA_IBENDPORT 14
#define LSM_AUDIT_DATA_LOCKDOWN 15
#define LSM_AUDIT_DATA_NOTIFICATION 16
#define LSM_AUDIT_DATA_ANONINODE 17
union {
struct path path;
struct dentry *dentry;
@ -96,6 +97,7 @@ struct common_audit_data {
struct lsm_ibpkey_audit *ibpkey;
struct lsm_ibendport_audit *ibendport;
int reason;
const char *anonclass;
} u;
/* this union contains LSM specific data */
union {

3
security/lsm_audit.c
View file

@ -433,6 +433,9 @@ static void dump_common_audit_data(struct audit_buffer *ab,
audit_log_format(ab, " lockdown_reason=\"%s\"",
lockdown_reasons[a->u.reason]);
break;
case LSM_AUDIT_DATA_ANONINODE:
audit_log_format(ab, " anonclass=%s", a->u.anonclass);
break;
} /* switch (a->type) */
}

4
security/selinux/hooks.c
View file

@ -2964,8 +2964,8 @@ static int selinux_inode_init_security_anon(struct inode *inode,
* allowed to actually create this type of anonymous inode.
*/
ad.type = LSM_AUDIT_DATA_INODE;
ad.u.inode = inode;
ad.type = LSM_AUDIT_DATA_ANONINODE;
ad.u.anonclass = name ? (const char *)name->name : "?";
return avc_has_perm(&selinux_state,
tsec->sid,