linux-kernel - [PATCH AUTOSEL 5.4 256/266] tracing/probe: Fix bpf_task_fd

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Message-Id: <20200618011631.604574-256-sashal@kernel.org>
Date:   Wed, 17 Jun 2020 21:16:21 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Yonghong Song <yhs@...com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 256/266] tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes

From: Jean-Philippe Brucker <jean-philippe@...aro.org>

[ Upstream commit 22d5bd6867364b41576a712755271a7d6161abd6 ]

Commit 60d53e2c3b75 ("tracing/probe: Split trace_event related data from
trace_probe") removed the trace_[ku]probe structure from the
trace_event_call->data pointer. As bpf_get_[ku]probe_info() were
forgotten in that change, fix them now. These functions are currently
only used by the bpf_task_fd_query() syscall handler to collect
information about a perf event.

Fixes: 60d53e2c3b75 ("tracing/probe: Split trace_event related data from trace_probe")
Signed-off-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Acked-by: Yonghong Song <yhs@...com>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Link: https://lore.kernel.org/bpf/20200608124531.819838-1-jean-philippe@linaro.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/trace/trace_kprobe.c | 2 +-
 kernel/trace/trace_uprobe.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index fba4b48451f6..26de9c654956 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1464,7 +1464,7 @@ int bpf_get_kprobe_info(const struct perf_event *event, u32 *fd_type,
 	if (perf_type_tracepoint)
 		tk = find_trace_kprobe(pevent, group);
 	else
-		tk = event->tp_event->data;
+		tk = trace_kprobe_primary_from_call(event->tp_event);
 	if (!tk)
 		return -EINVAL;
 
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 2619bc5ed520..5294843de6ef 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1405,7 +1405,7 @@ int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type,
 	if (perf_type_tracepoint)
 		tu = find_probe_event(pevent, group);
 	else
-		tu = event->tp_event->data;
+		tu = trace_uprobe_primary_from_call(event->tp_event);
 	if (!tu)
 		return -EINVAL;
 
-- 
2.25.1