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 BCB3A373141; Sat, 28 Feb 2026 17:58:31 +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=1772301511; cv=none; b=drADyRNYEnIIfvQsQ4ELnhyDX1IivOZMsbor8l8dl8jwqxp0PoJRJ5r1+4lm8VQ3bK0oXx5LxgTa0xsNzvc9jHt7QnBC6doOpDHpH5Qlanui5anXutyOcFlgNC7U6XILUMBNOd6O6KHnrY3zXBorzhvIbSy1vaNObgxpK16hvVA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772301511; c=relaxed/simple; bh=G4eFtNv3Fsch3fZYKLdT73Hxi+luVylOgZvfXpQleOI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AujUmNZboWVAVnBi1vsSWe9CwK9Z4xC2c4lgmapd5O8a8062t4XwLAc5yPk7yGnYRzAXGiVhXXGJt6Zxa4dMUzzxSbeKUjVoQyqTGOCcNx9eYisdu3GU5Mlh77WZUUz0a8+I7KJB7Y+/CFtBaITwsC6dXW/JhbkYfk/Cw1zVCzw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gHYkeb8k; 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="gHYkeb8k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00120C19423; Sat, 28 Feb 2026 17:58:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772301511; bh=G4eFtNv3Fsch3fZYKLdT73Hxi+luVylOgZvfXpQleOI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gHYkeb8k2htw2/kE5eorRxMH3u0Q1Vcn4WgvvxxMOUyKMgjPZfTCyFnYNZnw6kW8O MC+3IYUScMtfPI1iu/4rV2pIWYDXcwqE1bOFi1Bvp7Fcy/liKsEtYKIzPOA7DjPQgK vtuyz3qwumrFpsURJiWvZU0bHJgB2zu8SCpT9iBqosHNtP1TeSd2BYOwnQqY3jmlfM si2F5F4GdV/pN1dea8mhAsUf9gUFT0gSNG0mk5lsjgJW4QAl4nO2t2Ths+T50DV6r8 M5o7j/8bFeVkgxIns7wFPYepZzvLJsOgm+f9vsD+9KE363ejnzboNlkpOt9spBNdhj PmP33N8YQFOug== From: Sasha Levin To: patches@lists.linux.dev Cc: "Masami Hiramatsu (Google)" , stable@vger.kernel.org, Mathieu Desnoyers , "Steven Rostedt (Google)" , Sasha Levin Subject: [PATCH 6.18 697/752] tracing: Fix to set write permission to per-cpu buffer_size_kb Date: Sat, 28 Feb 2026 12:46:48 -0500 Message-ID: <20260228174750.1542406-697-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228174750.1542406-1-sashal@kernel.org> References: <20260228174750.1542406-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: "Masami Hiramatsu (Google)" [ Upstream commit f844282deed7481cf2f813933229261e27306551 ] 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. Cc: stable@vger.kernel.org Cc: Mathieu Desnoyers Link: https://patch.msgid.link/177071301597.2293046.11683339475076917920.stgit@mhiramat.tok.corp.google.com Fixes: 21ccc9cd7211 ("tracing: Disable "other" permission bits in the tracefs files") Signed-off-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) Signed-off-by: Sasha Levin --- 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 907923d5f8bbb..e1d902464e080 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9183,7 +9183,7 @@ tracing_init_tracefs_percpu(struct trace_array *tr, long cpu) trace_create_cpu_file("stats", TRACE_MODE_READ, d_cpu, tr, cpu, &tracing_stats_fops); - 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); if (tr->range_addr_start) -- 2.51.0