tracing: Fix test_event_printk() to process entire print argument

tracing: Fix test_event_printk() to process entire print argument

The test_event_printk() analyzes print formats of trace events looking for
cases where it may dereference a pointer that is not in the ring buffer
which can possibly be a bug when the trace event is read from the ring
buffer and the content of that pointer no longer exists.

The function needs to accurately go from one print format argument to the
next. It handles quotes and parenthesis that may be included in an
argument. When it finds the start of the next argument, it uses a simple
"c = strstr(fmt + i, ',')" to find the end of that argument!

In order to include "%s" dereferencing, it needs to process the entire
content of the print format argument and not just the content of the first
',' it finds. As there may be content like:

 ({ const char *saved_ptr = trace_seq_buffer_ptr(p); static const char
   *access_str[] = { "---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux"
   }; union kvm_mmu_page_role role; role.word = REC->role;
   trace_seq_printf(p, "sp gen %u gfn %llx l%u %u-byte q%u%s %s%s" " %snxe
   %sad root %u %s%c", REC->mmu_valid_gen, REC->gfn, role.level,
   role.has_4_byte_gpte ? 4 : 8, role.quadrant, role.direct ? " direct" : "",
   access_str[role.access], role.invalid ? " invalid" : "", role.efer_nx ? ""
   : "!", role.ad_disabled ? "!" : "", REC->root_count, REC->unsync ?
   "unsync" : "sync", 0); saved_ptr; })

Which is an example of a full argument of an existing event. As the code
already handles finding the next print format argument, process the
argument at the end of it and not the start of it. This way it has both
the start of the argument as well as the end of it.

Add a helper function "process_pointer()" that will do the processing during
the loop as well as at the end. It also makes the code cleaner and easier
to read.

Cc: [email protected]
Cc: Masami Hiramatsu <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: https://lore.kernel.org/[email protected]
Fixes: 5013f454a352c ("tracing: Add check of trace event print fmts for dereferencing pointers")
Signed-off-by: Steven Rostedt (Google) <[email protected]>