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 5A8EC2F6167; Tue, 30 Sep 2025 15:14:28 +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=1759245268; cv=none; b=nmUH+9qkQHulp2MlCG/P5+Lv873evTkZvroUZvwocizGKPpDvQLbj+H79Rtm1TGpHSKHmlvpDt0lIX7ULFYPBeIxbPrQyUJN3cLLpgUNOFLyD+xMqmtjkCSphbogXWy3VpKzjKc5fKeWDeNU5IBvWV8ZGcnoMjcYtH9D2/1ADSs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759245268; c=relaxed/simple; bh=a456hYY0xl7NYpwZNS5UMyHykqmZlK8FW9XHD0Tk3nw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iKMLbUB6Wl9zwzAuzrAOaUNS/vQe9OF+zT3CWgsj3Wfqh1xVjqkY7FQosyntxQqihgVGGKdqsqqj5Wy78U8d1LI6hhgutss/IZY6DLnLAth2mq5FnZt4Oq95aPmXqvdikVFk6/xE1QMxo2grYCqosuq3Hq66uHRrSj6LSszkh9I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=DsSc+RbK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="DsSc+RbK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BB81FC4CEF0; Tue, 30 Sep 2025 15:14:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1759245268; bh=a456hYY0xl7NYpwZNS5UMyHykqmZlK8FW9XHD0Tk3nw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DsSc+RbKlOpH9BFVf+JB0/4bNKOJqY8eJ3iomlJnwzZVKSiE5eWnUs+SbDkuYka59 Qm+Qr6zzVnp5V2/zCa6sRPSootP564yIu51o2bGWsShERfJ2TRuvB3zauC3MMujOzV TCXrPzStN+5wJM6J231GVhm+XcCIP55OaTQfjsNk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Leon Hwang , Alexei Starovoitov , Sasha Levin Subject: [PATCH 5.15 116/151] bpf: Reject bpf_timer for PREEMPT_RT Date: Tue, 30 Sep 2025 16:47:26 +0200 Message-ID: <20250930143832.228868098@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250930143827.587035735@linuxfoundation.org> References: <20250930143827.587035735@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Leon Hwang [ Upstream commit e25ddfb388c8b7e5f20e3bf38d627fb485003781 ] When enable CONFIG_PREEMPT_RT, the kernel will warn when run timer selftests by './test_progs -t timer': BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48 In order to avoid such warning, reject bpf_timer in verifier when PREEMPT_RT is enabled. Signed-off-by: Leon Hwang Link: https://lore.kernel.org/r/20250910125740.52172-2-leon.hwang@linux.dev Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin --- kernel/bpf/verifier.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 89b4fa815a9ba..4b7c9a60a7352 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -5071,6 +5071,10 @@ static int process_timer_func(struct bpf_verifier_env *env, int regno, verbose(env, "verifier bug. Two map pointers in a timer helper\n"); return -EFAULT; } + if (IS_ENABLED(CONFIG_PREEMPT_RT)) { + verbose(env, "bpf_timer cannot be used for PREEMPT_RT.\n"); + return -EOPNOTSUPP; + } meta->map_uid = reg->map_uid; meta->map_ptr = map; return 0; -- 2.51.0