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GET /api/patches/2196622/?format=api
{ "id": 2196622, "url": "http://patchwork.ozlabs.org/api/patches/2196622/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260215150914.3392479-3-den@valinux.co.jp/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260215150914.3392479-3-den@valinux.co.jp>", "list_archive_url": null, "date": "2026-02-15T15:09:12", "name": "[2/4] PCI: endpoint: pci-epf-test: Sanity-check doorbell offset within BAR", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "60273bc3601b57a0db3ced5c03f0397ee594d837", "submitter": { "id": 91573, "url": "http://patchwork.ozlabs.org/api/people/91573/?format=api", "name": "Koichiro Den", "email": "den@valinux.co.jp" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260215150914.3392479-3-den@valinux.co.jp/mbox/", "series": [ { "id": 492223, "url": "http://patchwork.ozlabs.org/api/series/492223/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=492223", "date": "2026-02-15T15:09:10", "name": "PCI: endpoint: Doorbell-related fixes", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492223/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196622/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196622/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-47308-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ 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dkim=pass header.d=valinux.co.jp; arc=none" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=valinux.co.jp;\n s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=MMGAMfnYWSEiNEZdjlnOA56dlSnnOIuiXrZgESk1T8o=;\n b=hGTPGU46KixCn67PoKEYlNcxZA5YGy+5YSf1uctaVWhltUO7o8cqmkXgSoWJekd2I03jYhmNZqsnjwEGJwx+sGalDOMMkUkp/44+c/ScTbo2dTYP3L7OLyf5vIL0s70xZtmK7wdKzEqyULWQEWgAOlJ0GCuVF5+sc/fMSGMr6rY=", "From": "Koichiro Den <den@valinux.co.jp>", "To": "mani@kernel.org,\n\tkwilczynski@kernel.org,\n\tkishon@kernel.org,\n\tbhelgaas@google.com,\n\tjdmason@kudzu.us,\n\tdave.jiang@intel.com,\n\tallenbh@gmail.com,\n\tcassel@kernel.org,\n\tFrank.Li@nxp.com", "Cc": "linux-pci@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tntb@lists.linux.dev", "Subject": "[PATCH 2/4] PCI: endpoint: pci-epf-test: Sanity-check doorbell offset\n within BAR", "Date": "Mon, 16 Feb 2026 00:09:12 +0900", "Message-ID": "<20260215150914.3392479-3-den@valinux.co.jp>", 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", "X-OriginatorOrg": "valinux.co.jp", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n d0734216-9ac8-4689-ed32-08de6ca432fe", "X-MS-Exchange-CrossTenant-AuthSource": "TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "15 Feb 2026 15:09:21.9624\n (UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "7a57bee8-f73d-4c5f-a4f7-d72c91c8c111", "X-MS-Exchange-CrossTenant-MailboxType": "HOSTED", "X-MS-Exchange-CrossTenant-UserPrincipalName": "\n rzKAK+8W16kTGfWQshXx623UgIDOTVUiNveTXw9Kc5hkldORkfpkMIQGJ+2jVSql+CKGB9OuY1oDTHMQyET1UQ==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "TY4P286MB7240" }, "content": "pci-epf-test advertises the doorbell target to the RC as a BAR number\nand an offset. The RC rings the doorbell with a single DWORD MMIO write\nto BAR + offset.\n\nFor MSI/MSI-X-based doorbells, the message address is required to be\nDWORD-aligned, so the computed offset should not straddle a BAR boundary\nin normal operation.\n\nHowever, with support for doorbells based on mechanisms other than\nMSI/MSI-X (via pci_epf_alloc_doorbell()), the returned message address\nmay not necessarily be DWORD-aligned. In such a case, offset plus the\n32-bit write width could cross the end of the BAR aperture. The offset\nreturned by pci_epf_align_inbound_addr() is guaranteed to be within the\nBAR size, but this alone does not ensure that a 32-bit write starting at\nthat offset stays within the BAR.\n\nAdd a bounds check to ensure that the 32-bit doorbell write always stays\nwithin the BAR aperture. While this should not trigger for\nspec-compliant MSI/MSI-X addresses, it provides a defensive guard\nagainst unexpected offsets from future doorbell implementations.\n\nSuggested-by: Niklas Cassel <cassel@kernel.org>\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\n drivers/pci/endpoint/functions/pci-epf-test.c | 3 +++\n 1 file changed, 3 insertions(+)", "diff": "diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c\nindex 0cb7af0919dc..148a34e51f6b 100644\n--- a/drivers/pci/endpoint/functions/pci-epf-test.c\n+++ b/drivers/pci/endpoint/functions/pci-epf-test.c\n@@ -761,6 +761,9 @@ static void pci_epf_test_enable_doorbell(struct pci_epf_test *epf_test,\n \tif (ret)\n \t\tgoto err_doorbell_cleanup;\n \n+\tif (size_add(offset, sizeof(u32)) > epf->bar[bar].size)\n+\t\tgoto err_doorbell_cleanup;\n+\n \treg->doorbell_offset = cpu_to_le32(offset);\n \n \tepf_test->db_bar.barno = bar;\n", "prefixes": [ "2/4" ] }