From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4B336EA3F2A for ; Tue, 10 Feb 2026 09:26:47 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vpk0m-0000vB-18; Tue, 10 Feb 2026 04:26:24 -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 1vpk0a-0000cK-BN for qemu-devel@nongnu.org; Tue, 10 Feb 2026 04:26:12 -0500 Received: from smtp-out2.suse.de ([2a07:de40:b251:101:10:150:64:2]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1vpk0R-0001Dt-QE for qemu-devel@nongnu.org; Tue, 10 Feb 2026 04:26:11 -0500 Received: from hawking.nue2.suse.org (unknown [10.168.4.11]) by smtp-out2.suse.de (Postfix) with ESMTP id 31C135BCD3; Tue, 10 Feb 2026 09:26:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1770715562; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type; bh=PHWDImYY74MKpc3uiLbl38IhGD6EmOsNvNmAikAZizc=; b=gBrjMKoEmm2LI/EiopOqdNKslbz1yKGU8GV+S5IpyquO+dSJTv/viCsYbyK3zP3SqIt1sq 5Vr9PHkQMT15ZlojOB8qHY9+0ViIbiVagwmxmNh75Cm+xvxer+/7doYwNLYOd7c2J2qSXx MxzWVR8rTj/nn6Wuqd5eGTCO+KDLs8g= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1770715562; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type; bh=PHWDImYY74MKpc3uiLbl38IhGD6EmOsNvNmAikAZizc=; b=U0Jthf00lKX203CrJUf2+BPm9aJ0RtdZgOercnYYWQm2APdqnCt+yhwU+8C8sLyBejKHYY CNPOR9EJXWi6frCg== Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1770715562; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type; bh=PHWDImYY74MKpc3uiLbl38IhGD6EmOsNvNmAikAZizc=; b=gBrjMKoEmm2LI/EiopOqdNKslbz1yKGU8GV+S5IpyquO+dSJTv/viCsYbyK3zP3SqIt1sq 5Vr9PHkQMT15ZlojOB8qHY9+0ViIbiVagwmxmNh75Cm+xvxer+/7doYwNLYOd7c2J2qSXx MxzWVR8rTj/nn6Wuqd5eGTCO+KDLs8g= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1770715562; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type; bh=PHWDImYY74MKpc3uiLbl38IhGD6EmOsNvNmAikAZizc=; b=U0Jthf00lKX203CrJUf2+BPm9aJ0RtdZgOercnYYWQm2APdqnCt+yhwU+8C8sLyBejKHYY CNPOR9EJXWi6frCg== Received: by hawking.nue2.suse.org (Postfix, from userid 17005) id 231A04A0A2A; Tue, 10 Feb 2026 10:26:02 +0100 (CET) From: Andreas Schwab To: Laurent Vivier (odd fixer:Linux user) Subject: [PATCH] linux-user: properly check flags in openat2 CC: Pierrick Bouvier , qemu-devel@nongnu.org Date: Tue, 10 Feb 2026 10:26:02 +0100 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spamd-Result: default: False [-4.19 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.19)[-0.975]; RCVD_NO_TLS_LAST(0.10)[]; MIME_GOOD(-0.10)[text/plain]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; URIBL_BLOCKED(0.00)[suse.de:mid,suse.de:email]; RCPT_COUNT_THREE(0.00)[3]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_ONE(0.00)[1]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:email] Received-SPF: pass client-ip=2a07:de40:b251:101:10:150:64:2; envelope-from=schwab@suse.de; helo=smtp-out2.suse.de 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, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org target_to_host_bitmask truncates the bitmask to int. Check that the upper half of the flags do not have any bits set. Signed-off-by: Andreas Schwab --- linux-user/syscall.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 8469b81878..667aea6a03 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8822,6 +8822,10 @@ static int do_openat2(CPUArchState *cpu_env, abi_long dirfd, } return ret; } + if (tswap64(how.flags) >> 32) { + return -TARGET_EINVAL; + } + pathname = lock_user_string(guest_pathname); if (!pathname) { return -TARGET_EFAULT; -- 2.53.0 -- Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."