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 87F4915853A; Wed, 20 Nov 2024 12:58:27 +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=1732107507; cv=none; b=G20sOK8Dj6PjV0TNeRpIfsduGM498fPCflaFO968c1sP/4eO5GcbdEPZBJvLYJrvbdVMR9koWjZDyxwtwkbfRh0EjwT9oRUAyPiA8Ekki0hSdKX/rO7ZvmTaqERDncjULUa1M2RyXKWBvA/QwR7htcYkTQX+zXBe4WEBOBABdr0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732107507; c=relaxed/simple; bh=RA46DoDYlVKXpRMMGjYXncSGUpBjEof4Uhf4B6Nnq3U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=UpLZPiZGPW8YT1wYFxJhxJjJAY5GgfRjZwgh4lrS1FP0kGg8y+Clwpn6YHua++6d4aQz0RS7GAyb8xR26/kBL+3qyi32dXDYvlRpk85KfFmg2xwxsrJATV9OKixOHGD7SUbj8bR+7GveCDK+zvaJ3uaKVCyS82KkGUxAqOfYUKI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=D++EuP3T; 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="D++EuP3T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5B566C4CECD; Wed, 20 Nov 2024 12:58:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1732107507; bh=RA46DoDYlVKXpRMMGjYXncSGUpBjEof4Uhf4B6Nnq3U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D++EuP3TRz5Zs2+H/GRAO+8cdJBTT12kbvf1fUIYWQKq+fFIOJh2P4542kd4ektL0 VUJq5o1G0CrXVsxCGPJSqA4Bm7w5EljOiLPMFlnCTtDEEb+O1MwrvOfYQVw54xAb5F k1bIU+ectB7cLVlafml53SpfYL4DL8NVS40q2D3Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Micha=C5=82=20Pecio?= , "Russell King (Oracle)" , Sasha Levin Subject: [PATCH 6.11 033/107] ARM: fix cacheflush with PAN Date: Wed, 20 Nov 2024 13:56:08 +0100 Message-ID: <20241120125630.426610820@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241120125629.681745345@linuxfoundation.org> References: <20241120125629.681745345@linuxfoundation.org> User-Agent: quilt/0.67 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Russell King (Oracle) [ Upstream commit ca29cfcc4a21083d671522ad384532e28a43f033 ] It seems that the cacheflush syscall got broken when PAN for LPAE was implemented. User access was not enabled around the cache maintenance instructions, causing them to fault. Fixes: 7af5b901e847 ("ARM: 9358/2: Implement PAN for LPAE by TTBR0 page table walks disablement") Reported-by: Michał Pecio Tested-by: Michał Pecio Signed-off-by: Russell King (Oracle) Signed-off-by: Sasha Levin --- arch/arm/kernel/traps.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 480e307501bb4..6ea645939573f 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -570,6 +570,7 @@ static int bad_syscall(int n, struct pt_regs *regs) static inline int __do_cache_op(unsigned long start, unsigned long end) { + unsigned int ua_flags; int ret; do { @@ -578,7 +579,9 @@ __do_cache_op(unsigned long start, unsigned long end) if (fatal_signal_pending(current)) return 0; + ua_flags = uaccess_save_and_enable(); ret = flush_icache_user_range(start, start + chunk); + uaccess_restore(ua_flags); if (ret) return ret; -- 2.43.0