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 E793C244665; Tue, 30 Sep 2025 15:29:12 +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=1759246153; cv=none; b=BTpoPw88sDi5P6K7HLreG7/FpkSvR79maPzZAM6aeXFs3LS1TxzKMdkA0lKVBf+wsX5H3mbf0mh9Mgj/JjoT8AMiWmqj5rUdi0BEyPbkDFCwCIRoE5ieOsiADcQkotV9ARsmTMu6qHL0QTrNFHZPS9c61UmU+0Sl8+rZkhFY3UY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759246153; c=relaxed/simple; bh=6rRD3/bP41ILDxcV3CnZqgrQNgQqep+HHYQGPBTYm0U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QfVpcOrzLfF+XP7aoqG8EZHE8ghj0HYumeNRbdufMvowRiWT2+cdW57Rpey96tGMA4XWKVVyAKoRXPbApGEjEk9Ff/JT9CzmhRZ3atrtMZms297HSmfGDt6rzLGqR+A/ZioTF1vpeC2ZGlSuDaVVbjPng3xH7nLyO42+oPVbkcg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cxiadkz3; 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="cxiadkz3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 726EFC4CEF0; Tue, 30 Sep 2025 15:29:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1759246152; bh=6rRD3/bP41ILDxcV3CnZqgrQNgQqep+HHYQGPBTYm0U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cxiadkz30Pe+g97UaWjwAgfWdwEb8jThSPPXGUF+KBJlBbXmvjFW8n/G8ZNHA8ZMv IG81RfDQ3RRdubPrpHZoTzxKz7HWdF4xisTLSbl+i6V8AA0dlHS8iulqkFVUIazDLm N4cD7r7/weQKYhBTFFYUUVSBnQUiB1Sc1Tb3KWZY= 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 6.12 38/89] bpf: Reject bpf_timer for PREEMPT_RT Date: Tue, 30 Sep 2025 16:47:52 +0200 Message-ID: <20250930143823.500330298@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250930143821.852512002@linuxfoundation.org> References: <20250930143821.852512002@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 6.12-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 6e22abf3326b6..1829f62a74a9e 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -7799,6 +7799,10 @@ 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