diff mbox series

[4.4,047/190] ftrace: Handle commands when closing set_ftrace_filter file

Message ID 20210520092103.728121583@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg KH May 20, 2021, 9:21 a.m. UTC 
From: Steven Rostedt (VMware) <rostedt@goodmis.org>

commit 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 upstream.

 # echo switch_mm:traceoff > /sys/kernel/tracing/set_ftrace_filter

will cause switch_mm to stop tracing by the traceoff command.

 # echo -n switch_mm:traceoff > /sys/kernel/tracing/set_ftrace_filter

does nothing.

The reason is that the parsing in the write function only processes
commands if it finished parsing (there is white space written after the
command). That's to handle:

 write(fd, "switch_mm:", 10);
 write(fd, "traceoff", 8);

cases, where the command is broken over multiple writes.

The problem is if the file descriptor is closed, then the write call is
not processed, and the command needs to be processed in the release code.
The release code can handle matching of functions, but does not handle
commands.

Cc: stable@vger.kernel.org
Fixes: eda1e32855656 ("tracing: handle broken names in ftrace filter")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 kernel/trace/ftrace.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -4401,8 +4401,11 @@  int ftrace_regex_release(struct inode *i
 
 	parser = &iter->parser;
 	if (trace_parser_loaded(parser)) {
+		int enable = !(iter->flags & FTRACE_ITER_NOTRACE);
+
 		parser->buffer[parser->idx] = 0;
-		ftrace_match_records(iter->hash, parser->buffer, parser->idx);
+		ftrace_process_regex(iter->hash, parser->buffer,
+				     parser->idx, enable);
 	}
 
 	trace_parser_put(parser);