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    Subject[PATCH ghak90 V5 03/10] audit: read container ID of a process
    Date
    Add support for reading the audit container identifier from the proc
    filesystem.

    This is a read from the proc entry of the form
    /proc/PID/audit_containerid where PID is the process ID of the task
    whose audit container identifier is sought.

    The read expects up to a u64 value (unset: 18446744073709551615).

    This read requires CAP_AUDIT_CONTROL.

    Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
    Acked-by: Serge Hallyn <serge@hallyn.com>
    ---
    fs/proc/base.c | 23 +++++++++++++++++++++--
    1 file changed, 21 insertions(+), 2 deletions(-)

    diff --git a/fs/proc/base.c b/fs/proc/base.c
    index 2505c46c8701..0b833cbdf5b6 100644
    --- a/fs/proc/base.c
    +++ b/fs/proc/base.c
    @@ -1295,6 +1295,24 @@ static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
    .llseek = generic_file_llseek,
    };

    +static ssize_t proc_contid_read(struct file *file, char __user *buf,
    + size_t count, loff_t *ppos)
    +{
    + struct inode *inode = file_inode(file);
    + struct task_struct *task = get_proc_task(inode);
    + ssize_t length;
    + char tmpbuf[TMPBUFLEN*2];
    +
    + if (!task)
    + return -ESRCH;
    + /* if we don't have caps, reject */
    + if (!capable(CAP_AUDIT_CONTROL))
    + return -EPERM;
    + length = scnprintf(tmpbuf, TMPBUFLEN*2, "%llu", audit_get_contid(task));
    + put_task_struct(task);
    + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
    +}
    +
    static ssize_t proc_contid_write(struct file *file, const char __user *buf,
    size_t count, loff_t *ppos)
    {
    @@ -1325,6 +1343,7 @@ static ssize_t proc_contid_write(struct file *file, const char __user *buf,
    }

    static const struct file_operations proc_contid_operations = {
    + .read = proc_contid_read,
    .write = proc_contid_write,
    .llseek = generic_file_llseek,
    };
    @@ -3039,7 +3058,7 @@ static int proc_stack_depth(struct seq_file *m, struct pid_namespace *ns,
    #ifdef CONFIG_AUDIT
    REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
    REG("sessionid", S_IRUGO, proc_sessionid_operations),
    - REG("audit_containerid", S_IWUSR, proc_contid_operations),
    + REG("audit_containerid", S_IWUSR|S_IRUSR, proc_contid_operations),
    #endif
    #ifdef CONFIG_FAULT_INJECTION
    REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
    @@ -3428,7 +3447,7 @@ static int proc_tid_comm_permission(struct inode *inode, int mask)
    #ifdef CONFIG_AUDIT
    REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
    REG("sessionid", S_IRUGO, proc_sessionid_operations),
    - REG("audit_containerid", S_IWUSR, proc_contid_operations),
    + REG("audit_containerid", S_IWUSR|S_IRUSR, proc_contid_operations),
    #endif
    #ifdef CONFIG_FAULT_INJECTION
    REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
    --
    1.8.3.1
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