From nobody Wed Feb 11 00:59:43 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1770066146463162.25329850436174; Mon, 2 Feb 2026 13:02:26 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vn13a-0002eT-Lu; Mon, 02 Feb 2026 16:02:03 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vn12x-000168-EB; Mon, 02 Feb 2026 16:01:23 -0500 Received: from isrv.corpit.ru ([212.248.84.144]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vn12v-0004Px-QN; Mon, 02 Feb 2026 16:01:23 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 069411851AA; Mon, 02 Feb 2026 23:57:54 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id B8E0735B321; Mon, 02 Feb 2026 23:58:35 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Matthew Lugg , Richard Henderson , Michael Tokarev Subject: [Stable-10.1.4 30/74] linux-user: fix mremap unmapping adjacent region Date: Mon, 2 Feb 2026 23:57:41 +0300 Message-ID: <20260202205833.941615-30-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: 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=lists.gnu.org; Received-SPF: pass client-ip=212.248.84.144; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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 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-ZM-MESSAGEID: 1770066148438154100 Content-Type: text/plain; charset="utf-8" From: Matthew Lugg This typo meant that calls to `mremap` which shrink a mapping by some N bytes would, when the virtual address space was pre-reserved (e.g. 32-bit guest on 64-bit host), unmap the N bytes following the *original* mapping. Signed-off-by: Matthew Lugg Reviewed-by: Richard Henderson Signed-off-by: Richard Henderson Message-ID: <20251117170954.31451-2-mlugg@mlugg.co.uk> (cherry picked from commit aaed9ca1797d70a507371aea688c5cd60b074e2d) Signed-off-by: Michael Tokarev diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 002e1e668e..7a5f7c3660 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -1170,7 +1170,8 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong = old_size, errno =3D ENOMEM; host_addr =3D MAP_FAILED; } else if (reserved_va && old_size > new_size) { - mmap_reserve_or_unmap(old_addr + old_size, + /* Re-reserve pages we just shrunk out of the mapping = */ + mmap_reserve_or_unmap(old_addr + new_size, old_size - new_size); } } --=20 2.47.3