From nobody Tue Feb 10 20:14:26 2026 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 C79F433C534; Tue, 10 Feb 2026 08:43:38 +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=1770713018; cv=none; b=kfpagvDhoyBVi7csjjxbWGIgLZi1np3bjC2oqJdloeTkGMeQdhBA2WXVpZJIEL97ozsTWfsa1s1GbXtLjfdvrg0WkpDgP6pcvDpOaISf2eTHZAyS5PJm0uA3eur++najXjDyH/LDuwQBOJnb89o1j7MMfq9C/osk7ot+jfyIXos= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770713018; c=relaxed/simple; bh=sPfczV+iQh/5YeCLjihJxq4iEgnUbU7vuVeJkK5BiRU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Jjp/QDL/McaKheYDhkJrZVPtpKaijLTQnmDXdb9PPr/mDSS5jViKFFtN4LyPUMNstJWQlOk7wlFUaN73bMJvoMcu0hMzqu2tx6HbtHfAgtbS7fGDYyrE6wiXqzDXln0bRGf0jX8aQSTeH/DqJYMzw/Yumh4pRHkoGNdOP/rDkt4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dchPzW8t; 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="dchPzW8t" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A41B7C19424; Tue, 10 Feb 2026 08:43:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770713018; bh=sPfczV+iQh/5YeCLjihJxq4iEgnUbU7vuVeJkK5BiRU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dchPzW8tt8rU3Gmko/LqV/ekJNo8TKBj94/zIrRP+bq/fK9UVnuT2Ss4PN/+FJ6uu NvKhvo15okbhLDcGbYdRp9/p/FzWUR+iSCTRb8ElMB1gHPXo0U+zTC05IZlwPRLAun pbA1ME9+284ClW0sXQYCTxg1kECIhuXAcZMUaddwO1hoPIoaFgsVMFqDcEYjoL0HQu w/Nu97YGMmJDWyAvj52Y4x3btfh4kxZOeXbzKy04m5QIZojQzcequhZnJoQL3/PAb1 CXEPoHT/02q41yl8e8olwsaw7iepC96NGkbI8VbOf/JX3Eb2auoxfSDkLtufGcmdG+ Pub8d2wad+Tpw== From: "Masami Hiramatsu (Google)" To: Steven Rostedt Cc: Masami Hiramatsu , Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v8 1/6] tracing: Fix to set write permission to per-cpu buffer_size_kb Date: Tue, 10 Feb 2026 17:43:36 +0900 Message-ID: <177071301597.2293046.11683339475076917920.stgit@mhiramat.tok.corp.google.com> X-Mailer: git-send-email 2.53.0.239.g8d8fc8a987-goog In-Reply-To: <177071300558.2293046.12057922262682243630.stgit@mhiramat.tok.corp.google.com> References: <177071300558.2293046.12057922262682243630.stgit@mhiramat.tok.corp.google.com> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) Since the per-cpu buffer_size_kb file is writable for changing per-cpu ring buffer size, the file should have the write access permission. Fixes: 21ccc9cd7211 ("tracing: Disable "other" permission bits in the trace= fs files") Signed-off-by: Masami Hiramatsu (Google) --- Changes in v8: Newly added. --- 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 845b8a165daf..fd470675809b 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -8613,7 +8613,7 @@ tracing_init_tracefs_percpu(struct trace_array *tr, l= ong cpu) trace_create_cpu_file("stats", TRACE_MODE_READ, d_cpu, tr, cpu, &tracing_stats_fops); =20 - trace_create_cpu_file("buffer_size_kb", TRACE_MODE_READ, d_cpu, + trace_create_cpu_file("buffer_size_kb", TRACE_MODE_WRITE, d_cpu, tr, cpu, &tracing_entries_fops); =20 if (tr->range_addr_start)