ring-buffer: Allow splice to read previous partially read pages

commit fa8f4a89736b654125fb254b0db753ac68a5fced upstream.

If a page is partially read, and then the splice system call is run
against the ring buffer, it will always fail to read, no matter how much
is in the ring buffer. That's because the code path for a partial read of
the page does will fail if the "full" flag is set.

The splice system call wants full pages, so if the read of the ring buffer
is not yet full, it should return zero, and the splice will block. But if
a previous read was done, where the beginning has been consumed, it should
still be given to the splice caller if the rest of the page has been
written to.

This caused the splice command to never consume data in this scenario, and
let the ring buffer just fill up and lose events.

Link: https://lkml.kernel.org/r/20220927144317.46be6b80@gandalf.local.home
Cc: stable@vger.kernel.org
Fixes: 8789a9e7df6bf ("ring-buffer: read page interface")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index c30a70ab0e7ae57ab118d23a2711173f706ca577..4600b6fa2cf47c7d3145df0e212268418260d39e 100644 (file)
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4623,7 +4623,15 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
                unsigned int pos = 0;
                unsigned int size;
 
-               if (full)
+               /*
+                * If a full page is expected, this can still be returned
+                * if there's been a previous partial read and the
+                * rest of the page can be read and the commit page is off
+                * the reader page.
+                */
+               if (full &&
+                   (!read || (len < (commit - read)) ||
+                    cpu_buffer->reader_page == cpu_buffer->commit_page))
                        goto out_unlock;
 
                if (len > (commit - read))