linux-kernel - [PATCH v3] tracing: Fix out of bounds write in get_trace

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Message-Id: <20201029155714.3935-1-hqjagain@gmail.com>
Date:   Thu, 29 Oct 2020 23:57:14 +0800
From:   Qiujun Huang <hqjagain@...il.com>
To:     rostedt@...dmis.org, mingo@...hat.com, linux-kernel@...r.kernel.org
Cc:     Qiujun Huang <hqjagain@...il.com>
Subject: [PATCH v3] tracing: Fix out of bounds write in get_trace_buf

The subscript should be nesting - 1, as nesting had self-added.

Fixes: e2ace001176dc ("tracing: Choose static tp_printk buffer by explicit nesting count")
Signed-off-by: Qiujun Huang <hqjagain@...il.com>
---
v3:
Modify the way of array reference instead.
v2:
Fix a typo in the title.
---
 kernel/trace/trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 528971714fc6..daa96215e294 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3132,7 +3132,7 @@ static char *get_trace_buf(void)
 
 	/* Interrupts must see nesting incremented before we use the buffer */
 	barrier();
-	return &buffer->buffer[buffer->nesting][0];
+	return &buffer->buffer[buffer->nesting - 1][0];
 }
 
 static void put_trace_buf(void)
-- 
2.17.1