From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8DB58C64EC4 for ; Fri, 10 Mar 2023 14:35:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232577AbjCJOfa (ORCPT ); Fri, 10 Mar 2023 09:35:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232602AbjCJOfZ (ORCPT ); Fri, 10 Mar 2023 09:35:25 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DB784EFF6D for ; Fri, 10 Mar 2023 06:35:21 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 75E6961745 for ; Fri, 10 Mar 2023 14:35:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6AE50C433EF; Fri, 10 Mar 2023 14:35:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678458920; bh=/5qzUNehwR6VOaUQTzxrEyfDJdliRzDYisWRPDqXMk0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SH7kJe1jmJ1pxL2XjeAxMX8va7HZWlnALqn4iTaKEUa8XmTNGIimnWuZPndQiLIhd urPe8xa7W1cBscLDUuaTtEh36tpWuiY6CvJd7XBT5fTv2y396Wb2BlnyiZ1KSCH4Rl x9dwi5uLwweO9lAr0CStBPHOuB2uMeFiC1rvvFqM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Andrew Jeffery , Frederic Barrat , Michael Ellerman , Sasha Levin Subject: [PATCH 5.4 157/357] powerpc/powernv/ioda: Skip unallocated resources when mapping to PE Date: Fri, 10 Mar 2023 14:37:26 +0100 Message-Id: <20230310133741.635948839@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133733.973883071@linuxfoundation.org> References: <20230310133733.973883071@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Frederic Barrat [ Upstream commit e64e71056f323a1e178dccf04d4c0f032d84436c ] pnv_ioda_setup_pe_res() calls opal to map a resource with a PE. However, the code assumes the resource is allocated and it uses the resource address to find out the segment(s) which need to be mapped to the PE. In the unlikely case where the resource hasn't been allocated, the computation for the segment number is garbage, which can lead to invalid memory access and potentially a kernel crash, such as: [ ] pci_bus 0002:02: Configuring PE for bus [ ] pci 0002:02 : [PE# fc] Secondary bus 0x0000000000000002..0x0000000000000002 associated with PE#fc [ ] BUG: Kernel NULL pointer dereference on write at 0x00000000 [ ] Faulting instruction address: 0xc00000000005eac4 [ ] Oops: Kernel access of bad area, sig: 7 [#1] [ ] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV [ ] Modules linked in: [ ] CPU: 12 PID: 1 Comm: swapper/20 Not tainted 5.10.50-openpower1 #2 [ ] NIP: c00000000005eac4 LR: c00000000005ea44 CTR: 0000000030061b9c [ ] REGS: c000200007383650 TRAP: 0300 Not tainted (5.10.50-openpower1) [ ] MSR: 9000000000009033 CR: 44000224 XER: 20040000 [ ] CFAR: c00000000005eaa0 DAR: 0000000000000000 DSISR: 02080000 IRQMASK: 0 [ ] GPR00: c00000000005dd98 c0002000073838e0 c00000000185de00 c000200fff018960 [ ] GPR04: 00000000000000fc 0000000000000003 0000000000000000 0000000000000000 [ ] GPR08: 0000000000000000 0000000000000000 0000000000000000 9000000000001033 [ ] GPR12: 0000000031cb0000 c000000ffffe6a80 c000000000010a58 0000000000000000 [ ] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ ] GPR20: 0000000000000000 0000000000000000 0000000000000000 c00000000711e200 [ ] GPR24: 0000000000000100 c000200009501120 c00020000cee2800 00000000000003ff [ ] GPR28: c000200fff018960 0000000000000000 c000200ffcb7fd00 0000000000000000 [ ] NIP [c00000000005eac4] pnv_ioda_setup_pe_res+0x94/0x1a0 [ ] LR [c00000000005ea44] pnv_ioda_setup_pe_res+0x14/0x1a0 [ ] Call Trace: [ ] [c0002000073838e0] [c00000000005eb98] pnv_ioda_setup_pe_res+0x168/0x1a0 (unreliable) [ ] [c000200007383970] [c00000000005dd98] pnv_pci_ioda_dma_dev_setup+0x43c/0x970 [ ] [c000200007383a60] [c000000000032cdc] pcibios_bus_add_device+0x78/0x18c [ ] [c000200007383aa0] [c00000000028f2bc] pci_bus_add_device+0x28/0xbc [ ] [c000200007383b10] [c00000000028f3a0] pci_bus_add_devices+0x50/0x7c [ ] [c000200007383b50] [c00000000028f3c4] pci_bus_add_devices+0x74/0x7c [ ] [c000200007383b90] [c00000000028f3c4] pci_bus_add_devices+0x74/0x7c [ ] [c000200007383bd0] [c00000000069ad0c] pcibios_init+0xf0/0x104 [ ] [c000200007383c50] [c0000000000106d8] do_one_initcall+0x84/0x1c4 [ ] [c000200007383d20] [c0000000006910b8] kernel_init_freeable+0x264/0x268 [ ] [c000200007383dc0] [c000000000010a68] kernel_init+0x18/0x138 [ ] [c000200007383e20] [c00000000000cbfc] ret_from_kernel_thread+0x5c/0x80 [ ] Instruction dump: [ ] 7f89e840 409d000c 7fbbf840 409c000c 38210090 4848f448 809c002c e95e0120 [ ] 7ba91764 38a00003 57a7043e 38c00000 <7c8a492e> 5484043e e87e0018 4bff23bd Hitting the problem is not that easy. It was seen with a (semi-bogus) PCI device with a class code of 0. The generic PCI framework doesn't allocate resources in such a case. The patch is simply skipping resources which are still flagged with IORESOURCE_UNSET. We don't have the problem with 64-bit mem resources, as the address of the resource is checked to be within the range of the 64-bit mmio window. See pnv_ioda_reserve_dev_m64_pe() and pnv_pci_is_m64(). Reported-by: Andrew Jeffery Fixes: 23e79425fe7c ("powerpc/powernv: Simplify pnv_ioda_setup_pe_seg()") Signed-off-by: Frederic Barrat Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20230120093215.19496-1-fbarrat@linux.ibm.com Signed-off-by: Sasha Levin --- arch/powerpc/platforms/powernv/pci-ioda.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 058223233088e..df4457e743d33 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -3008,7 +3008,8 @@ static void pnv_ioda_setup_pe_res(struct pnv_ioda_pe *pe, int index; int64_t rc; - if (!res || !res->flags || res->start > res->end) + if (!res || !res->flags || res->start > res->end || + res->flags & IORESOURCE_UNSET) return; if (res->flags & IORESOURCE_IO) { -- 2.39.2