From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
To: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Florent Revest <revest@chromium.org>,
linux-trace-kernel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
bpf <bpf@vger.kernel.org>, Sven Schnelle <svens@linux.ibm.com>,
Alexei Starovoitov <ast@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Alan Maguire <alan.maguire@oracle.com>,
Mark Rutland <mark.rutland@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>, Guo Ren <guoren@kernel.org>
Subject: Re: [PATCH v5 11/34] function_graph: Have the instances use their own ftrace_ops for filtering
Date: Tue, 26 Dec 2023 09:20:23 +0900 [thread overview]
Message-ID: <20231226092023.2383d0d05c1120c094302685@kernel.org> (raw)
In-Reply-To: <170290522555.220107.1435543481968270637.stgit@devnote2>
Hi,
On Mon, 18 Dec 2023 22:13:46 +0900
"Masami Hiramatsu (Google)" <mhiramat@kernel.org> wrote:
> @@ -408,15 +395,51 @@ int function_graph_enter(unsigned long ret, unsigned long func,
> return -EBUSY;
> }
>
> +/* This is called from ftrace_graph_func() via ftrace */
> +int function_graph_enter_ops(unsigned long ret, unsigned long func,
> + unsigned long frame_pointer, unsigned long *retp,
> + struct fgraph_ops *gops)
> +{
> + struct ftrace_graph_ent trace;
> + int index;
> + int type;
> +
Here, I found that this needs to check whether the fgraph_array[gops->idx]
is still valid or not. When unregistering the fgraph, fgraph_array[idx] is
cleared (with fgraph_stub) and disable ftrace. So there is a chance to hit
this and it will mess up the shadow stack because gops->idx is already invalid.
Thank you,
--
Masami Hiramatsu (Google) <mhiramat@kernel.org>
next prev parent reply other threads:[~2023-12-26 0:20 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-18 13:11 [PATCH v5 00/34] tracing: fprobe: function_graph: Multi-function graph and fprobe on fgraph Masami Hiramatsu (Google)
2023-12-18 13:11 ` [PATCH v5 01/34] tracing: Add a comment about ftrace_regs definition Masami Hiramatsu (Google)
2024-01-05 17:12 ` Mark Rutland
2023-12-18 13:11 ` [PATCH v5 02/34] x86: tracing: Add ftrace_regs definition in the header Masami Hiramatsu (Google)
2023-12-18 13:12 ` [PATCH v5 03/34] function_graph: Convert ret_stack to a series of longs Masami Hiramatsu (Google)
2023-12-18 13:12 ` [PATCH v5 04/34] fgraph: Use BUILD_BUG_ON() to make sure we have structures divisible by long Masami Hiramatsu (Google)
2023-12-18 13:12 ` [PATCH v5 05/34] function_graph: Add an array structure that will allow multiple callbacks Masami Hiramatsu (Google)
2023-12-18 13:12 ` [PATCH v5 06/34] function_graph: Allow multiple users to attach to function graph Masami Hiramatsu (Google)
2023-12-19 13:23 ` Jiri Olsa
2023-12-19 15:45 ` Masami Hiramatsu
2023-12-26 15:24 ` Masami Hiramatsu
2023-12-18 13:12 ` [PATCH v5 07/34] function_graph: Remove logic around ftrace_graph_entry and return Masami Hiramatsu (Google)
2023-12-18 13:13 ` [PATCH v5 08/34] ftrace/function_graph: Pass fgraph_ops to function graph callbacks Masami Hiramatsu (Google)
2023-12-18 13:13 ` [PATCH v5 09/34] ftrace: Allow function_graph tracer to be enabled in instances Masami Hiramatsu (Google)
2023-12-18 13:13 ` [PATCH v5 10/34] ftrace: Allow ftrace startup flags exist without dynamic ftrace Masami Hiramatsu (Google)
2023-12-18 13:13 ` [PATCH v5 11/34] function_graph: Have the instances use their own ftrace_ops for filtering Masami Hiramatsu (Google)
2023-12-26 0:20 ` Masami Hiramatsu [this message]
2024-01-05 17:09 ` Mark Rutland
2024-01-08 1:14 ` Masami Hiramatsu
2024-01-08 12:25 ` Mark Rutland
2024-01-08 14:21 ` Mark Rutland
2024-01-08 15:03 ` Mark Rutland
2024-01-11 13:47 ` Masami Hiramatsu
2024-01-11 2:15 ` Masami Hiramatsu
2024-01-11 11:01 ` Mark Rutland
2024-01-11 13:45 ` Masami Hiramatsu
2023-12-18 13:13 ` [PATCH v5 12/34] function_graph: Use a simple LRU for fgraph_array index number Masami Hiramatsu (Google)
2023-12-18 13:14 ` [PATCH v5 13/34] function_graph: Add "task variables" per task for fgraph_ops Masami Hiramatsu (Google)
2023-12-18 13:14 ` [PATCH v5 14/34] function_graph: Move set_graph_function tests to shadow stack global var Masami Hiramatsu (Google)
2023-12-18 13:14 ` [PATCH v5 15/34] function_graph: Move graph depth stored data " Masami Hiramatsu (Google)
2023-12-18 13:14 ` [PATCH v5 16/34] function_graph: Move graph notrace bit " Masami Hiramatsu (Google)
2023-12-18 13:15 ` [PATCH v5 17/34] function_graph: Implement fgraph_reserve_data() and fgraph_retrieve_data() Masami Hiramatsu (Google)
2023-12-18 13:15 ` [PATCH v5 18/34] function_graph: Add selftest for passing local variables Masami Hiramatsu (Google)
2023-12-18 13:15 ` [PATCH v5 19/34] function_graph: Add a new entry handler with parent_ip and ftrace_regs Masami Hiramatsu (Google)
2023-12-18 13:15 ` [PATCH v5 20/34] function_graph: Add a new exit " Masami Hiramatsu (Google)
2023-12-18 13:15 ` [PATCH v5 21/34] x86/ftrace: Enable HAVE_FUNCTION_GRAPH_FREGS Masami Hiramatsu (Google)
2023-12-18 13:15 ` [PATCH v5 22/34] tracing: Rename ftrace_regs_return_value to ftrace_regs_get_return_value Masami Hiramatsu (Google)
2024-01-05 17:14 ` Mark Rutland
2024-01-08 1:09 ` Masami Hiramatsu
2023-12-18 13:16 ` [PATCH v5 23/34] arm64: ftrace: Enable HAVE_FUNCTION_GRAPH_FREGS Masami Hiramatsu (Google)
2023-12-18 13:16 ` [PATCH v5 24/34] fprobe: Use ftrace_regs in fprobe entry handler Masami Hiramatsu (Google)
2023-12-19 13:23 ` Jiri Olsa
2023-12-19 13:23 ` Jiri Olsa
2023-12-19 22:51 ` Masami Hiramatsu
2023-12-18 13:16 ` [PATCH v5 25/34] fprobe: Use ftrace_regs in fprobe exit handler Masami Hiramatsu (Google)
2023-12-18 13:16 ` [PATCH v5 26/34] tracing: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs Masami Hiramatsu (Google)
2023-12-18 13:16 ` [PATCH v5 27/34] tracing: Add ftrace_fill_perf_regs() for perf event Masami Hiramatsu (Google)
2023-12-18 13:17 ` [PATCH v5 28/34] fprobe: Rewrite fprobe on function-graph tracer Masami Hiramatsu (Google)
2023-12-19 14:39 ` Jiri Olsa
2023-12-20 1:00 ` Masami Hiramatsu
2023-12-18 13:17 ` [PATCH v5 29/34] tracing/fprobe: Remove nr_maxactive from fprobe Masami Hiramatsu (Google)
2023-12-18 13:17 ` [PATCH v5 30/34] tracing/fprobe: Enable fprobe events with CONFIG_DYNAMIC_FTRACE_WITH_ARGS Masami Hiramatsu (Google)
2023-12-18 13:17 ` [PATCH v5 31/34] bpf: Enable kprobe_multi feature if CONFIG_FPROBE is enabled Masami Hiramatsu (Google)
2023-12-18 13:17 ` [PATCH v5 32/34] selftests: ftrace: Remove obsolate maxactive syntax check Masami Hiramatsu (Google)
2023-12-18 13:18 ` [PATCH v5 33/34] selftests/ftrace: Add a test case for repeating register/unregister fprobe Masami Hiramatsu (Google)
2023-12-18 13:18 ` [PATCH v5 34/34] Documentation: probes: Update fprobe on function-graph tracer Masami Hiramatsu (Google)
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