[PATCH 4th revision] Add SELinux context support to AUDIT target

[Mr Dash Four]

> Do you think this should be hardcoded to be obj? Would we ever log the subj? Or should 
> obj be part of the function name to make it clear which piece is getting logged?
>   
I thought of that, though I don't know what variety of option names 
would be there to be used with that function.

If there is a need to use something other than "obj", like, "subj" or 
even "tcontext" or "scontext" for example, then I would favour passing 
the option name as function parameter - something like "void 
audit_log_secctx(struct audit_buffer *ab, char *secname, u32 secid)" or 
even "void audit_log_secctx(struct audit_buffer *ab, int secname, u32 
secid)" (secname here being one of 0, 1, 2 ... corresponding to "obj", 
"subj" etc).

Similar approach is already used in audit.c - in audit_log_config_change 
for example:

static int audit_log_config_change(char *function_name, int new, int 
old, uid_t loginuid, u32 sessionid, u32 sid, int allow_changes)
{
    struct audit_buffer *ab;
    int rc = 0;

    ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
    audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, 
new, old, loginuid, sessionid);