This is a note to let you know that I've just added the patch titled
tracing/uprobes: Fix the usage of uprobe_buffer_enable() in probe_event_enable()
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-uprobes-fix-the-usage-of-uprobe_buffer_enable-in-probe_event_enable.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fb6bab6a5ad46d00b5ffa22268f21df1cd7c59df Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Date: Fri, 27 Jun 2014 19:01:46 +0200
Subject: tracing/uprobes: Fix the usage of uprobe_buffer_enable() in probe_event_enable()
From: Oleg Nesterov <oleg@xxxxxxxxxx>
commit fb6bab6a5ad46d00b5ffa22268f21df1cd7c59df upstream.
The usage of uprobe_buffer_enable() added by dcad1a20 is very wrong,
1. uprobe_buffer_enable() and uprobe_buffer_disable() are not balanced,
_enable() should be called only if !enabled.
2. If uprobe_buffer_enable() fails probe_event_enable() should clear
tp.flags and free event_file_link.
3. If uprobe_register() fails it should do uprobe_buffer_disable().
Link: http://lkml.kernel.org/p/20140627170146.GA18332@xxxxxxxxxx
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Acked-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Fixes: dcad1a204f72 "tracing/uprobes: Fetch args before reserving a ring buffer"
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace_uprobe.c | 31 +++++++++++++++++++------------
1 file changed, 19 insertions(+), 12 deletions(-)
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -911,26 +911,33 @@ probe_event_enable(struct trace_uprobe *
tu->tp.flags |= TP_FLAG_PROFILE;
}
- ret = uprobe_buffer_enable();
- if (ret < 0)
- return ret;
-
WARN_ON(!uprobe_filter_is_empty(&tu->filter));
if (enabled)
return 0;
+ ret = uprobe_buffer_enable();
+ if (ret)
+ goto err_flags;
+
tu->consumer.filter = filter;
ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
- if (ret) {
- if (file) {
- list_del(&link->list);
- kfree(link);
- tu->tp.flags &= ~TP_FLAG_TRACE;
- } else
- tu->tp.flags &= ~TP_FLAG_PROFILE;
- }
+ if (ret)
+ goto err_buffer;
+
+ return 0;
+ err_buffer:
+ uprobe_buffer_disable();
+
+ err_flags:
+ if (file) {
+ list_del(&link->list);
+ kfree(link);
+ tu->tp.flags &= ~TP_FLAG_TRACE;
+ } else {
+ tu->tp.flags &= ~TP_FLAG_PROFILE;
+ }
return ret;
}
Patches currently in stable-queue which might be from oleg@xxxxxxxxxx are
queue-3.15/tracing-uprobes-fix-the-usage-of-uprobe_buffer_enable-in-probe_event_enable.patch
queue-3.15/tracing-uprobes-revert-support-mix-of-ftrace-and-perf.patch
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