lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20250327114911.2c713511@gandalf.local.home>
Date: Thu, 27 Mar 2025 11:49:11 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Libo Chen <libo.chen@...cle.com>
Subject: [PATCH] tracing: Verify event formats that have "%*p.."

From: Steven Rostedt <rostedt@...dmis.org>

The trace event verifier checks the formats of trace events to make sure
that they do not point at memory that is not in the trace event itself or
in data that will never be freed. If an event references data that was
allocated when the event triggered and that same data is freed before the
event is read, then the kernel can crash by reading freed memory.

The verifier runs at boot up (or module load) and scans the print formats
of the events and checks their arguments to make sure that dereferenced
pointers are safe. If the format uses "%*p.." the verifier will ignore it,
and that could be dangerous. Cover this case as well.

Also add to the sample code a use case of "%*pbl".

Link: https://lore.kernel.org/all/bcba4d76-2c3f-4d11-baf0-02905db953dd@oracle.com/

Reported-by: Libo Chen <libo.chen@...cle.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_events.c                | 7 +++++++
 samples/trace_events/trace-events-sample.h | 8 ++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 7b3ef1d26167..34e7b4af9f88 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -470,6 +470,7 @@ static void test_event_printk(struct trace_event_call *call)
 			case '%':
 				continue;
 			case 'p':
+ do_pointer:
 				/* Find dereferencing fields */
 				switch (fmt[i + 1]) {
 				case 'B': case 'R': case 'r':
@@ -498,6 +499,12 @@ static void test_event_printk(struct trace_event_call *call)
 						continue;
 					if (fmt[i + j] == '*') {
 						star = true;
+						/* Handle %*pbl case */
+						if (!j && fmt[i + 1] == 'p') {
+							arg++;
+							i++;
+							goto do_pointer;
+						}
 						continue;
 					}
 					if ((fmt[i + j] == 's')) {
diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
index 999f78d380ae..0622c9e3f2be 100644
--- a/samples/trace_events/trace-events-sample.h
+++ b/samples/trace_events/trace-events-sample.h
@@ -319,7 +319,8 @@ TRACE_EVENT(foo_bar,
 		__assign_cpumask(cpum, cpumask_bits(mask));
 	),
 
-	TP_printk("foo %s %d %s %s %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
+	TP_printk("foo %s %d %s %s %s %s %s %s (%s) (%s) %s [%d] %*pbl",
+		  __entry->foo, __entry->bar,
 
 /*
  * Notice here the use of some helper functions. This includes:
@@ -370,7 +371,10 @@ TRACE_EVENT(foo_bar,
 
 		  __get_str(str), __get_str(lstr),
 		  __get_bitmask(cpus), __get_cpumask(cpum),
-		  __get_str(vstr))
+		  __get_str(vstr),
+	         __get_dynamic_array_len(cpus),
+	         __get_dynamic_array_len(cpus),
+	         __get_dynamic_array(cpus))
 );
 
 /*
-- 
2.47.2


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ