From nobody Sat Sep 26 20:50:42 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1788220487; cv=none; d=zohomail.com; s=zohoarc; b=ezEqFYUm5Qn4IuFRshfn2FcgEB5RRWTOiClsUplWQtILLM4ZG/GdQOJfqUuzfCU1zqEwEoFydPaN+8CoXB+9+ZP24XDJiY13Hk/DWAbMLOEelaO4BE83Wu+4I9+VLRWXOu3NpVA2zdOHYw07chFSxAw11yl4Sjl1l8RhaNv9YfU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1788220487; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=Z9WafF8jVdm/lbhcxOaSLb+RwsFR/e0Er5SXOPxwqg8=; b=d/AW1sHvMFmgnKaKOSUT0+rkKFGKrtXCHNnOUklfxVYaDZGmV00ue2MnLTVh5n7feP9yLvg2FBLcANsS95newNmTFCTmGT8FxKOBYJEmA7w8+NiDJ7DnLhL7u75VTc6jkFtNTkhSW2KakVU+hwK2oFy1SgtFurlPY633H5mhJ0U= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1788220487439865.0634015145579; Mon, 31 Aug 2026 16:54:47 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1x1BpJ-0007J2-OZ; Mon, 31 Aug 2026 19:54:09 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x19SQ-0000fj-U4 for qemu-devel@nongnu.org; Mon, 31 Aug 2026 17:22:22 -0400 Received: from mail-wm1-x32f.google.com ([2a00:1450:4864:20::32f]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1x19SP-0004nf-2b for qemu-devel@nongnu.org; Mon, 31 Aug 2026 17:22:22 -0400 Received: by mail-wm1-x32f.google.com with SMTP id 5b1f17b1804b1-49b0eab380eso3770095e9.0 for ; Mon, 31 Aug 2026 14:22:19 -0700 (PDT) Received: from sima-pc.tail8094aa.ts.net (CBL217-132-71-241.bb.netvision.net.il. [217.132.71.241]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49cdce10148sm18749815e9.5.2026.08.31.14.22.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Aug 2026 14:22:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1788211338; x=1788816138; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Z9WafF8jVdm/lbhcxOaSLb+RwsFR/e0Er5SXOPxwqg8=; b=bdIU5ytxG8jgqTTJWU+/o8BsstSHcws3vsK97ElTLg76V2jPq8w2RkiN+Zwbo5wMKL 7UwOKu193cc7OyJBu/aSRkTt/zgbXx5iPSQWCO8Te0AH+B/hfj1efurFZ025uI02Xl2B SHcJBuTrjzQ00RsPhg1c6xDUmJHXfrNz/JGnFSdf3gVWNqJXa8WRv6xZJofzL67SOOa/ +hBfHVX5rhjuISvUt+ce/Fy4oE6efxUAa5uR8ENQ2BnYAY2jlPRoLtdbmwHVCi65Pyqr Z2aR1A0VRTgZLiWMvBPKrZ6nOdkVlUVfuyFg4ogNYgZmgt35dKeGli7EUu1H7iKNmAZf xvog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788211338; x=1788816138; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=Z9WafF8jVdm/lbhcxOaSLb+RwsFR/e0Er5SXOPxwqg8=; b=HyeIrcvZs/HNYxQAE1xGT8oPpYt6wtuz/HjAkVI1fF8mgtUEb/TGi7lYxKJEkZUfS1 xGl63RoEpqbr2Z0qjMw6eDUy6fhHOGbh1BvqlM+CMqxx53XAJwIexAnXLsLb1iIdolA3 smQyXb08Sth1IrZWkAftA/j3/kox0CCfnR6ebeb3MuE042ZZwlOvi/XkTFf8GGeZhjRZ dlPO2IQydvttK227B6ruqpvjwE4ERt53sRdfhVrL2UCi+qrVtwP2P95sKqh31+v6dWl8 0L0pHtdIyCmNUlFF4HEeY/LOulykZiVeVEU533YIq++44cv74K2ryspkvPbQsLAkoyRi Zj+A== X-Gm-Message-State: AFuF++lqtI6BIVzQ/LBTu7YE37niJ+zK3a7iaUg1r4BFW7vguj4Ol4Jw yt5qMdHe8nLEcx7SEHbfQipowqanigJYt91Z8jL4RxBJwfB1py2csYVt2Hps6x7X9sjf5A== X-Gm-Gg: AR+sD11PC5JvuXKsfkY6edYSTFvhou5UV1+5JryDSsohpvgZPCHSF/WTztA5AtGRh67 NFEMD8tubBS8UAhOJbgf7s40eR6wDvEhdcOpVoO9z/Usc8GExIqalAvSSbuQd64jmujvrnZB7zm W2Zmt/PScyavXVNsrfXqCIg5+g3+49HawXGKlO7zwgyv4dq0wEVqoxVL/NWJDOxKBwWYZymHmto m6lSArWtlyfTzxI+6Ts02Tm0I8LCU7XWqSZl9K2YysMRz0W0bX/57k04zyo0del4c6kReqioJBF 5vAyLUKdKaOjj2U8WWQUoJjWp1mQlrtbiIgWlx1arYmLLoHQPRBt1ThmCK7EryHO5GNoC91I9cW STOrdKLY8LtrP3kuUlI+ek6XduOriurW9t/uoUd2EAfuElBQOE7wyv+J/l5xM86zeIgPrtOCiEz 8g7UX1glswM0prq11cn5UcTYZg7vxvzOSVbao9VjjrzFF5g7S77h66qOo2Dti1ncCYAVk6lCh92 ACbyP0WKJEhhrXKiYGOciwLs1LDcYR+BUfIcxmR6UddjL7iIr3YFv5zKSIUnQ== X-Received: by 2002:a05:600c:4e4c:b0:49b:e22:4ee4 with SMTP id 5b1f17b1804b1-49cdd416ef1mr14051705e9.4.1788211338104; Mon, 31 Aug 2026 14:22:18 -0700 (PDT) From: Roi Klevansky To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , Laurent Vivier , Helge Deller , Pierrick Bouvier , Roi Klevansky Subject: [PATCH 1/2] linux-user: return ENOMEM from madvise on unmapped ranges Date: Tue, 1 Sep 2026 00:20:39 +0300 Message-ID: <20260831212040.1833650-2-roiklevansky@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260831212040.1833650-1-roiklevansky@gmail.com> References: <20260831212040.1833650-1-roiklevansky@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::32f; envelope-from=roiklevansky@gmail.com; helo=mail-wm1-x32f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Mon, 31 Aug 2026 19:54:06 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1788220490442158500 Content-Type: text/plain; charset="utf-8" The kernel fails with ENOMEM when madvise() is called with a partially or fully unmapped address range. This fix allows target_madvise() to emulate this behavior by calling page_check_range() upfront while still allowing advice specific errors to take precedence. Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/4382 Signed-off-by: Roi Klevansky --- linux-user/mmap.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index cc0c2ee6c2..e5195cf501 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -1305,8 +1305,14 @@ abi_long target_madvise(abi_ulong start, abi_ulong l= en_in, int advice) * success, which is broken but some userspace programs fail to work * otherwise. Completely implementing such emulation is quite complica= ted * though. + * + * When some (or all) of the pages in the range are not mapped, madvise + * should fail with -ENOMEM. If another error occurs, its value is + * returned instead. */ mmap_lock(); + ret =3D page_check_range(start, len, PAGE_VALID) ? 0 : -TARGET_ENOMEM; + switch (advice) { case MADV_NORMAL: case MADV_RANDOM: @@ -1316,7 +1322,6 @@ abi_long target_madvise(abi_ulong start, abi_ulong le= n_in, int advice) case MADV_FREE: case MADV_COLD: case MADV_PAGEOUT: - ret =3D 0; /* OK */ break; case MADV_REMOVE: ret =3D -EOPNOTSUPP; --=20 2.55.0 From nobody Sat Sep 26 20:50:42 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1788220487; cv=none; d=zohomail.com; s=zohoarc; b=OcgcaXoZGkhfuQc+fcaEYcVr92dDHqzSldc1lNw4PPBIegKVL4KuHJfZ0nMcg24lsVm0pYXSKesBfKMuX1q8mPXx7jvuEFADPGIGouP5TT/F/bxaKCoH539exNbQFrYYx4w/3pD85fDaXXymSVdXtv+RrftK9OZD0KCOdYqGMFI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1788220487; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=ENmYRrI7kULhz8hcx6PjQC48ovvVVI5t0LJpUviRTck=; b=Z42HcQUMk5QsIVTjb9UgiMGYKEYNFAKbmXzS31MJyJ+QymEUh3BgscADp4KKfJ2RHyvAKOmWz1kvM7LnpmPYdm1dgfhqPESas20ZStJ/j5ZDXkup1wpjO9QNINLMBJ6d/2xDqDhTR0NIgULbc4RxFSYiCYQEfT/UDaanI1ed/P4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 178822048770634.30180591991166; Mon, 31 Aug 2026 16:54:47 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1x1BpH-0007IT-Pb; Mon, 31 Aug 2026 19:54:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x19SS-0000g9-2w for qemu-devel@nongnu.org; Mon, 31 Aug 2026 17:22:24 -0400 Received: from mail-wm1-x32c.google.com ([2a00:1450:4864:20::32c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1x19SP-0004oM-3h for qemu-devel@nongnu.org; Mon, 31 Aug 2026 17:22:23 -0400 Received: by mail-wm1-x32c.google.com with SMTP id 5b1f17b1804b1-4921eed3fa2so38287915e9.0 for ; Mon, 31 Aug 2026 14:22:20 -0700 (PDT) Received: from sima-pc.tail8094aa.ts.net (CBL217-132-71-241.bb.netvision.net.il. 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Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/4382 Signed-off-by: Roi Klevansky --- tests/tcg/multiarch/linux/linux-madvise.c | 43 +++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/tests/tcg/multiarch/linux/linux-madvise.c b/tests/tcg/multiarc= h/linux/linux-madvise.c index 539fb3b772..b7a52abb6c 100644 --- a/tests/tcg/multiarch/linux/linux-madvise.c +++ b/tests/tcg/multiarch/linux/linux-madvise.c @@ -1,4 +1,5 @@ #include +#include #include #include #include @@ -63,10 +64,52 @@ static void test_file(void) assert(ret =3D=3D 0); } =20 +static void test_mapped_and_unmapped(void) +{ + int pagesize =3D getpagesize(); + void *page; + int ret; + + page =3D mmap(NULL, pagesize, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, = -1, 0); + assert(page !=3D MAP_FAILED); + + ret =3D madvise(page, pagesize, MADV_NORMAL); + assert(ret =3D=3D 0); + + ret =3D munmap(page, pagesize); + assert(ret =3D=3D 0); + + ret =3D madvise(page, pagesize, MADV_NORMAL); + assert(ret =3D=3D -1); + assert(errno =3D=3D ENOMEM); +} + +static void test_partially_unmapped_enomem(void) +{ + int pagesize =3D getpagesize(); + void *page; + int ret; + + page =3D mmap(NULL, 3 * pagesize, PROT_READ, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + assert(page !=3D MAP_FAILED); + ret =3D munmap((char *)page + pagesize, pagesize); + assert(ret =3D=3D 0); + + ret =3D madvise(page, 3 * pagesize, MADV_NORMAL); + assert(ret =3D=3D -1); + assert(errno =3D=3D ENOMEM); + + ret =3D munmap(page, 3 * pagesize); + assert(ret =3D=3D 0); +} + int main(void) { test_anonymous(); test_file(); + test_mapped_and_unmapped(); + test_partially_unmapped_enomem(); =20 return EXIT_SUCCESS; } --=20 2.55.0