From nobody Tue Feb 10 06:59:04 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 1770070193711971.0464029480669; Mon, 2 Feb 2026 14:09:53 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vn279-0005h0-IE; Mon, 02 Feb 2026 17:09:47 -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 1vn25u-0004ry-J4; Mon, 02 Feb 2026 17:08:30 -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 1vn25t-0002bS-7F; Mon, 02 Feb 2026 17:08:30 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 8271D1852B7; Tue, 03 Feb 2026 01:07:34 +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 61AD635B3CA; Tue, 03 Feb 2026 01:08:16 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, =?UTF-8?q?Jean-Christian=20C=C3=8ERSTEA?= , Richard Henderson , Michael Tokarev Subject: [Stable-10.2.1 10/56] linux-user: allow null `pathname` for statx()/fstatat() Date: Tue, 3 Feb 2026 01:07:15 +0300 Message-ID: <20260202220805.945271-10-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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: 1770070195963158500 From: Jean-Christian C=C3=8ERSTEA Since Linux 6.11, the path argument may be NULL. Before this patch, qemu-*-linux-user failed with EFAULT when `pathname` was specified as NULL, even for Linux kernel hosts > 6.10. This patch fixes this issue by checking whether `arg2` is 0. If so, don't return EFAULT, but inst= ead perform the appropiate syscall and let the host's kernel handle null `pathn= ame`. Cc: qemu-stable@nongnu.org Signed-off-by: Jean-Christian C=C3=8ERSTEA Reviewed-by: Richard Henderson Signed-off-by: Richard Henderson Message-ID: <20251229121416.2209295-1-jean.christian.cirstea@gmail.com> (cherry picked from commit 82ae60c8b5cb98d610056a1e2d0ba72e9ef7907c) Signed-off-by: Michael Tokarev diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 2060e561a2..ee7c34027e 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -12141,9 +12141,13 @@ static abi_long do_syscall1(CPUArchState *cpu_env,= int num, abi_long arg1, int dirfd =3D arg1; int flags =3D arg3; =20 - p =3D lock_user_string(arg2); - if (p =3D=3D NULL) { - return -TARGET_EFAULT; + p =3D NULL; + /* Since Linux 6.11, the path argument may be NULL */ + if (arg2 !=3D 0) { + p =3D lock_user_string(arg2); + if (p =3D=3D NULL) { + return -TARGET_EFAULT; + } } #if defined(__NR_statx) { --=20 2.47.3