[{"id":3683862,"web_url":"http://patchwork.ozlabs.org/comment/3683862/","msgid":"<20260429073433.4027-1-linuxtestproject.agent@gmail.com>","list_archive_url":null,"date":"2026-04-29T07:34:33","subject":"Re: [LTP] syscalls/file_attr01: Dynamically expect EOPNOTSUPP on\n tmpfs without xattr","submitter":{"id":93132,"url":"http://patchwork.ozlabs.org/api/people/93132/","name":null,"email":"linuxtestproject.agent@gmail.com"},"content":"Hi Wake,\n\nOn Wed, 29 Apr 2026, Wake Liu wrote:\n> syscalls/file_attr01: Dynamically expect EOPNOTSUPP on tmpfs without xattr\n\n> +\tif (tc->ufattr == (struct file_attr **)(&null_ptr) && missing_tmpfs_xattr)\n> +\t\texp_errno = EOPNOTSUPP;\n\nThe override is scoped only to the null-ufattr tcase. The commit message says\nthe kernel checks xattr support \"before dereferencing the user pointer\", which\nraises the question of whether usize validation (EINVAL/E2BIG tcases) also\noccurs after the support check. If so, those tcases would also return\nEOPNOTSUPP on tmpfs without xattr and need the same treatment. Please clarify\nthe kernel's validation order for usize relative to the xattr support check.\n\n> Changes in v3:\n[...]\n> Changes in v2:\n[...]\n\nVersion changelogs should be stripped from the commit message before merging;\nthey belong in the cover letter only.\n\n---\nNote:\n\nOur agent completed the review of the patch. The full review can be\nfound at: https://github.com/linux-test-project/ltp-agent/actions/runs/25096139400\n\nThe agent can sometimes produce false positives although often its\nfindings are genuine. If you find issues with the review, please\ncomment this email or ignore the suggestions.\n\nRegards,\nLTP AI Reviewer","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=me4nIWZX;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; helo=picard.linux.it;\n envelope-from=ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it;\n receiver=patchwork.ozlabs.org)"],"Received":["from picard.linux.it (picard.linux.it [213.254.12.146])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g58Ft13VCz1yHv\n\tfor ; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3683949,"web_url":"http://patchwork.ozlabs.org/comment/3683949/","msgid":"","list_archive_url":null,"date":"2026-04-29T09:22:53","subject":"Re: [LTP] syscalls/file_attr01: Dynamically expect EOPNOTSUPP on\n tmpfs without xattr","submitter":{"id":92108,"url":"http://patchwork.ozlabs.org/api/people/92108/","name":"Wake Liu","email":"wakel@google.com"},"content":"Regarding the validation order of usize: I have verified that usize\nvalidation (EINVAL/E2BIG) occurs before the filesystem support check\nin the kernel. This is confirmed by the LTP test results on a kernel\nwith CONFIG_TMPFS_XATTR=n.\n\n 於 2026年4月29日週三 下午3:34寫道：\n>\n> Hi Wake,\n>\n> On Wed, 29 Apr 2026, Wake Liu wrote:\n> > syscalls/file_attr01: Dynamically expect EOPNOTSUPP on tmpfs without xattr\n>\n> > + if (tc->ufattr == (struct file_attr **)(&null_ptr) && missing_tmpfs_xattr)\n> > + exp_errno = EOPNOTSUPP;\n>\n> The override is scoped only to the null-ufattr tcase. The commit message says\n> the kernel checks xattr support \"before dereferencing the user pointer\", which\n> raises the question of whether usize validation (EINVAL/E2BIG tcases) also\n> occurs after the support check. If so, those tcases would also return\n> EOPNOTSUPP on tmpfs without xattr and need the same treatment. Please clarify\n> the kernel's validation order for usize relative to the xattr support check.\n>\n> > Changes in v3:\n> [...]\n> > Changes in v2:\n> [...]\n>\n> Version changelogs should be stripped from the commit message before merging;\n> they belong in the cover letter only.\n>\n> ---\n> Note:\n>\n> Our agent completed the review of the patch. The full review can be\n> found at: https://github.com/linux-test-project/ltp-agent/actions/runs/25096139400\n>\n> The agent can sometimes produce false positives although often its\n> findings are genuine. If you find issues with the review, please\n> comment this email or ignore the suggestions.\n>\n> Regards,\n> LTP AI Reviewer","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=lists.linux.it header.i=@lists.linux.it\n header.a=rsa-sha256 header.s=picard header.b=f2KQVRpC;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256\n header.s=20251104 header.b=WUMkkVZM;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; helo=picard.linux.it;\n envelope-from=ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it;\n receiver=patchwork.ozlabs.org)"],"Received":["from picard.linux.it (picard.linux.it [IPv6:2001:1418:10:5::2])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g5Bgd0XwYz1xqf\n\tfor ; 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