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    Subject[RFC PATCH V1 02/12] audit: log container info of syscalls
    Date
    Create a new audit record AUDIT_CONTAINER_INFO to document the container
    ID of a process if it is present.

    Called from audit_log_exit(), syscalls are covered.

    A sample raw event:
    type=SYSCALL msg=audit(1519924845.499:257): arch=c000003e syscall=257 success=yes exit=3 a0=ffffff9c a1=56374e1cef30 a2=241 a3=1b6 items=2 ppid=606 pid=635 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=3 comm="bash" exe="/usr/bin/bash" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key="tmpcontainerid"
    type=CWD msg=audit(1519924845.499:257): cwd="/root"
    type=PATH msg=audit(1519924845.499:257): item=0 name="/tmp/" inode=13863 dev=00:27 mode=041777 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:tmp_t:s0 nametype= PARENT cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0
    type=PATH msg=audit(1519924845.499:257): item=1 name="/tmp/tmpcontainerid" inode=17729 dev=00:27 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=unconfined_u:object_r:user_tmp_t:s0 nametype=CREATE cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0
    type=PROCTITLE msg=audit(1519924845.499:257): proctitle=62617368002D6300736C65657020313B206563686F2074657374203E202F746D702F746D70636F6E7461696E65726964
    type=UNKNOWN[1332] msg=audit(1519924845.499:257): op=task contid=123458

    See: https://github.com/linux-audit/audit-kernel/issues/32
    Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
    ---
    include/linux/audit.h | 5 +++++
    include/uapi/linux/audit.h | 1 +
    kernel/audit.c | 20 ++++++++++++++++++++
    kernel/auditsc.c | 2 ++
    4 files changed, 28 insertions(+)

    diff --git a/include/linux/audit.h b/include/linux/audit.h
    index fe4ba3f..3acbe9d 100644
    --- a/include/linux/audit.h
    +++ b/include/linux/audit.h
    @@ -154,6 +154,8 @@ extern void audit_log_link_denied(const char *operation,
    extern int audit_log_task_context(struct audit_buffer *ab);
    extern void audit_log_task_info(struct audit_buffer *ab,
    struct task_struct *tsk);
    +extern int audit_log_container_info(struct task_struct *tsk,
    + struct audit_context *context);

    extern int audit_update_lsm_rules(void);

    @@ -205,6 +207,9 @@ static inline int audit_log_task_context(struct audit_buffer *ab)
    static inline void audit_log_task_info(struct audit_buffer *ab,
    struct task_struct *tsk)
    { }
    +static inline int audit_log_container_info(struct task_struct *tsk,
    + struct audit_context *context);
    +{ }
    #define audit_enabled 0
    #endif /* CONFIG_AUDIT */

    diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
    index 921a71f..e83ccbd 100644
    --- a/include/uapi/linux/audit.h
    +++ b/include/uapi/linux/audit.h
    @@ -115,6 +115,7 @@
    #define AUDIT_REPLACE 1329 /* Replace auditd if this packet unanswerd */
    #define AUDIT_KERN_MODULE 1330 /* Kernel Module events */
    #define AUDIT_FANOTIFY 1331 /* Fanotify access decision */
    +#define AUDIT_CONTAINER_INFO 1332 /* Container ID information */

    #define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
    #define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
    diff --git a/kernel/audit.c b/kernel/audit.c
    index 5c25449..8dc745f 100644
    --- a/kernel/audit.c
    +++ b/kernel/audit.c
    @@ -1996,6 +1996,26 @@ void audit_log_session_info(struct audit_buffer *ab)
    audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
    }

    +/*
    + * audit_log_container_info - report container info
    + * @tsk: task to be recorded
    + * @context: task or local context for record
    + */
    +int audit_log_container_info(struct task_struct *tsk, struct audit_context *context)
    +{
    + struct audit_buffer *ab;
    +
    + if (!audit_containerid_set(tsk))
    + return 0;
    + /* Generate AUDIT_CONTAINER_INFO with container ID */
    + ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONTAINER_INFO);
    + if (!ab)
    + return -ENOMEM;
    + audit_log_format(ab, "contid=%llu", audit_get_containerid(tsk));
    + audit_log_end(ab);
    + return 0;
    +}
    +
    void audit_log_key(struct audit_buffer *ab, char *key)
    {
    audit_log_format(ab, " key=");
    diff --git a/kernel/auditsc.c b/kernel/auditsc.c
    index 0ee1e59..f015c25 100644
    --- a/kernel/auditsc.c
    +++ b/kernel/auditsc.c
    @@ -1453,6 +1453,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts

    audit_log_proctitle(tsk, context);

    + audit_log_container_info(tsk, context);
    +
    /* Send end of event record to help user space know we are finished */
    ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
    if (ab)
    --
    1.8.3.1
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