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tracing: Have event inject files inc the trace array ref count

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commit e5c624f027 upstream.

The event inject files add events for a specific trace array. For an
instance, if the file is opened and the instance is deleted, reading or
writing to the file will cause a use after free.

Up the ref count of the trace_array when a event inject file is opened.

Link: https://lkml.kernel.org/r/20230907024804.292337868@goodmis.org
Link: https://lore.kernel.org/all/1cb3aee2-19af-c472-e265-05176fe9bd84@huawei.com/

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Zheng Yejian <zhengyejian1@huawei.com>
Fixes: 6c3edaf9fd ("tracing: Introduce trace event injection")
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Google) 2023-09-06 22:47:16 -04:00 committed by Greg Kroah-Hartman
parent d65553fe52
commit 0c2982b015
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/trace_events_inject.c
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@ -328,7 +328,8 @@ event_inject_read(struct file *file, char __user *buf, size_t size,
}
const struct file_operations event_inject_fops = {
.open = tracing_open_generic,
.open = tracing_open_file_tr,
.read = event_inject_read,
.write = event_inject_write,
.release = tracing_release_file_tr,
};