From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5659E1EFFA1 for ; Fri, 15 May 2026 12:06:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778846814; cv=none; b=RlYl7naxVGdhamKpRKvEWM+cHjVYzCBrqWfmQYVIRX1BFeXuh1NVzQpLvmHw9XvNg1yRR3GCyH4u/SXJeTJVPeSZ2tDev6+lLxEJMfvlYS/lbsQaHeSU2DnRXhjOlMYdazTu4emMQErtAUrEd4fcOkQjYHYPhzKREOsw4OmnmI0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778846814; c=relaxed/simple; bh=pLtZn02GTohiVPsWz2akwsq7yMVOSlgb2BewredJLE0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SQiDCMBsgx2g4oyx+R5D6wZ/ZoBmbeJm+vsKE3dUapVKGQ3zDqrP8B9ysik5FaSWdP1RhhUC+yA54vnzIH1hvXqXNDt/o4KTvdPuqRlZgw64mnsCV9Q5kDPsBrxq3s3xGvsbxXrv1LGYK63EQcLkjUFlN0R+3lgF7i0YOAHjzI0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jKEYygvh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jKEYygvh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F65CC2BCB0; Fri, 15 May 2026 12:06:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778846814; bh=pLtZn02GTohiVPsWz2akwsq7yMVOSlgb2BewredJLE0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jKEYygvhHNFFl8DZ/NsS+sGazYDlXx6DEdZOdnFgJinX+j1Xkx3hmpfPC39xgXsQh k/gn8JmC0OMglamVw0WyfuzDzV5CNSL3piImxCq5vz9ErHU5hj9+YkCCqOG46J+KC1 ZCsgG+6LKOAvFH62SEEi+LeECtaaPV/O6CutMNTMOocI+1o5YtdB40gfa6m4uyDQmF FcRtDEU5cZ6Ypv8woyWtirRkq4aVBJsqtfsNNEpQYFlCSfPAnkyfLeXF0YwuTlExXf XqyHN68Gdr8aVJM3Xwyd9pk4TtHEQjD1Thd8mr0CuqwCYBFfJUvQwxHOIbI3zZhmP4 o9oxZRZREiGPQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Steven Rostedt , Mathieu Desnoyers , "Masami Hiramatsu (Google)" , Sasha Levin Subject: [PATCH 6.6.y] tracing/probes: Limit size of event probe to 3K Date: Fri, 15 May 2026 08:06:51 -0400 Message-ID: <20260515120651.3074726-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026051225-penny-nutcase-3d81@gregkh> References: <2026051225-penny-nutcase-3d81@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Steven Rostedt [ Upstream commit b2aa3b4d64e460ac606f386c24e7d8a873ce6f1a ] There currently isn't a max limit an event probe can be. One could make an event greater than PAGE_SIZE, which makes the event useless because if it's bigger than the max event that can be recorded into the ring buffer, then it will never be recorded. A event probe should never need to be greater than 3K, so make that the max size. As long as the max is less than the max that can be recorded onto the ring buffer, it should be fine. Cc: stable@vger.kernel.org Cc: Mathieu Desnoyers Acked-by: Masami Hiramatsu (Google) Fixes: 93ccae7a22274 ("tracing/kprobes: Support basic types on dynamic events") Link: https://patch.msgid.link/20260428122302.706610ba@gandalf.local.home Signed-off-by: Steven Rostedt [ adjusted context to place MAX_PROBE_EVENT_SIZE near MAX_STRING_SIZE and appended EVENT_TOO_BIG after NEED_STRING_TYPE ] Signed-off-by: Sasha Levin --- kernel/trace/trace_probe.c | 6 ++++++ kernel/trace/trace_probe.h | 4 +++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index d46a1033ba5b3..dee9494ed189a 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -1366,6 +1366,12 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size, parg->offset = *size; *size += parg->type->size * (parg->count ?: 1); + if (*size > MAX_PROBE_EVENT_SIZE) { + ret = -E2BIG; + trace_probe_log_err(ctx->offset, EVENT_TOO_BIG); + goto fail; + } + if (parg->count) { len = strlen(parg->type->fmttype) + 6; parg->fmt = kmalloc(len, GFP_KERNEL); diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index c71fa9c2f3815..ce5a0935cd45c 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -35,6 +35,7 @@ #define MAX_ARG_NAME_LEN 32 #define MAX_BTF_ARGS_LEN 128 #define MAX_STRING_SIZE PATH_MAX +#define MAX_PROBE_EVENT_SIZE 3072 /* Reserved field names */ #define FIELD_STRING_IP "__probe_ip" @@ -546,7 +547,8 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call, C(NO_BTF_FIELD, "This field is not found."), \ C(BAD_BTF_TID, "Failed to get BTF type info."),\ C(BAD_TYPE4STR, "This type does not fit for string."),\ - C(NEED_STRING_TYPE, "$comm and immediate-string only accepts string type"), + C(NEED_STRING_TYPE, "$comm and immediate-string only accepts string type"),\ + C(EVENT_TOO_BIG, "Event too big (too many fields?)"), #undef C #define C(a, b) TP_ERR_##a -- 2.53.0