Patch Detail
get:
Show a patch.
patch:
Update a patch.
put:
Update a patch.
GET /api/1.1/patches/2229922/?format=api
{ "id": 2229922, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229922/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260428214626.13329-1-deller@kernel.org/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260428214626.13329-1-deller@kernel.org>", "date": "2026-04-28T21:46:26", "name": "linux-user: Allow getsockopt() with NULL optval address", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7d4c89f76fddf5fc4b59bba6b9d528514b4e948e", "submitter": { "id": 87076, "url": "http://patchwork.ozlabs.org/api/1.1/people/87076/?format=api", "name": "Helge Deller", "email": "deller@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260428214626.13329-1-deller@kernel.org/mbox/", "series": [ { "id": 501938, "url": "http://patchwork.ozlabs.org/api/1.1/series/501938/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501938", "date": "2026-04-28T21:46:26", "name": "linux-user: Allow getsockopt() with NULL optval address", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501938/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2229922/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229922/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=MFV8gaR6;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g4vDT3vRBz1yHv\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 29 Apr 2026 07:47:35 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wHqGU-0001NP-Eo; Tue, 28 Apr 2026 17:46:46 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <deller@kernel.org>) id 1wHqGS-0001NC-Vn\n for qemu-devel@nongnu.org; Tue, 28 Apr 2026 17:46:45 -0400", "from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <deller@kernel.org>) id 1wHqGQ-0002RA-W0\n for qemu-devel@nongnu.org; Tue, 28 Apr 2026 17:46:44 -0400", "from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58])\n by sea.source.kernel.org (Postfix) with ESMTP id D7F4143AFD;\n Tue, 28 Apr 2026 21:46:32 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id 0D414C2BCAF;\n Tue, 28 Apr 2026 21:46:31 +0000 (UTC)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n s=k20201202; t=1777412792;\n bh=fUbUBNOS+gTd8SfUVwl+U29Q6KEI5N2CjiBhvCbj49U=;\n h=From:To:Cc:Subject:Date:From;\n b=MFV8gaR6hgWnDQI1ScvT+fZ74vt1iNqbp8scngknORj6GilZyl4R7oEGLKeKfHRQn\n 8OiCsVRUBG51894hCqXeSmG8WECZF/KPjUKgrifvabdtJe4S10c2bX3c38qUzdb4n5\n ZeM80sainkrmJAAIEk3egoUnsnSuEQqc/A8g1+A2gY3NW8JBomBgV97lCfVO88qTLn\n 3V2FZZn1jhHT5b7WQDObu5MNJN6j9ZcLlcbcU2EbIQUwnfuDJ+u6dBxJyfCbNWnH85\n lAyVC1MFRDE93C6PvSQIVT5M3LUsLb9XW1Xwa1YzcZ8OpaALor8HN6Xhu86fQ/ReiH\n c9BkQGBorwmHA==", "From": "Helge Deller <deller@kernel.org>", "To": "qemu-devel@nongnu.org", "Cc": "deller@gmx.de", "Subject": "[PATCH] linux-user: Allow getsockopt() with NULL optval address", "Date": "Tue, 28 Apr 2026 23:46:26 +0200", "Message-ID": "<20260428214626.13329-1-deller@kernel.org>", "X-Mailer": "git-send-email 2.53.0", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=2600:3c0a:e001:78e:0:1991:8:25;\n envelope-from=deller@kernel.org; helo=sea.source.kernel.org", "X-Spam_score_int": "-21", "X-Spam_score": "-2.2", "X-Spam_bar": "--", "X-Spam_report": "(-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.109,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "From: Helge Deller <deller@gmx.de>\n\nSome programs test availability of socket options by asking for the\nvalue with an NULL optval address, which currenrly always trigger an\nEFAULT in qemu. Fix it by allowing a NULL address, in the same manner\nas the Linux kernel on physical machines.\n\nResolves: https://gitlab.com/qemu-project/qemu/-/work_items/2390\nSigned-off-by: Helge Deller <deller@gmx.de>\n---\n linux-user/syscall.c | 50 +++++++++++++++++++++++++-------------------\n 1 file changed, 28 insertions(+), 22 deletions(-)", "diff": "diff --git a/linux-user/syscall.c b/linux-user/syscall.c\nindex 4594909242..d68edb7afd 100644\n--- a/linux-user/syscall.c\n+++ b/linux-user/syscall.c\n@@ -2644,6 +2644,10 @@ get_timeout:\n if (ret < 0) {\n return ret;\n }\n+ /* special case: destination address is NULL, return 0 */\n+ if (optval_addr) {\n+ len = 0;\n+ }\n if (len == sizeof(struct target__kernel_sock_timeval)) {\n if (copy_to_user_timeval64(optval_addr, &tv)) {\n return -TARGET_EFAULT;\n@@ -2844,7 +2848,10 @@ get_timeout:\n }\n if (len > lv)\n len = lv;\n- if (len == 4) {\n+ if (!optval_addr) {\n+ /* writing to NULL does not give error */\n+ len = 0;\n+ } else if (len == 4) {\n if (put_user_u32(val, optval_addr))\n return -TARGET_EFAULT;\n } else {\n@@ -2877,18 +2884,24 @@ get_timeout:\n return -TARGET_EINVAL;\n lv = sizeof(lv);\n ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));\n+write_ret:\n if (ret < 0)\n return ret;\n- if (len < sizeof(int) && len > 0 && val >= 0 && val < 255) {\n+ if (!optval_addr) {\n+ len = 0;\n+ } else if (len < sizeof(int) && len > 0 && val >= 0 && val < 255) {\n len = 1;\n- if (put_user_u32(len, optlen)\n- || put_user_u8(val, optval_addr))\n+ if (put_user_u8(val, optval_addr)) {\n return -TARGET_EFAULT;\n+ }\n } else {\n if (len > sizeof(int))\n len = sizeof(int);\n- if (put_user_u32(len, optlen)\n- || put_user_u32(val, optval_addr))\n+ if (put_user_u32(val, optval_addr)) {\n+ return -TARGET_EFAULT;\n+ }\n+ }\n+ if (put_user_u32(len, optlen)) {\n return -TARGET_EFAULT;\n }\n break;\n@@ -2939,20 +2952,7 @@ get_timeout:\n return -TARGET_EINVAL;\n lv = sizeof(lv);\n ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));\n- if (ret < 0)\n- return ret;\n- if (len < sizeof(int) && len > 0 && val >= 0 && val < 255) {\n- len = 1;\n- if (put_user_u32(len, optlen)\n- || put_user_u8(val, optval_addr))\n- return -TARGET_EFAULT;\n- } else {\n- if (len > sizeof(int))\n- len = sizeof(int);\n- if (put_user_u32(len, optlen)\n- || put_user_u32(val, optval_addr))\n- return -TARGET_EFAULT;\n- }\n+ goto write_ret;\n break;\n default:\n ret = -TARGET_ENOPROTOOPT;\n@@ -2986,8 +2986,14 @@ get_timeout:\n if (ret < 0) {\n return ret;\n }\n- if (put_user_u32(lv, optlen)\n- || put_user_u32(val, optval_addr)) {\n+ if (optval_addr) {\n+ if (put_user_u32(val, optval_addr)) {\n+ return -TARGET_EFAULT;\n+ }\n+ } else {\n+ lv = 0;\n+ }\n+ if (put_user_u32(lv, optlen)) {\n return -TARGET_EFAULT;\n }\n break;\n", "prefixes": [] }