On Fri, 07 May 2021 15:51:14 +0200 gregkh@linuxfoundation.org wrote:

The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

This works for both 4.9 and 4.4.

-- Steve

From 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 Mon Sep 17 00:00:00 2001

From: "Steven Rostedt (VMware)" rostedt@goodmis.org Date: Wed, 5 May 2021 10:38:24 -0400 Subject: [PATCH] ftrace: Handle commands when closing set_ftrace_filter file

# 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

Index: linux-test.git/kernel/trace/ftrace.c =================================================================== --- linux-test.git.orig/kernel/trace/ftrace.c +++ linux-test.git/kernel/trace/ftrace.c @@ -4486,8 +4486,11 @@ 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);