From patchwork Fri Aug 2 23:56:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Warner Losh X-Patchwork-Id: 13752108 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 2834EC3DA4A for ; Fri, 2 Aug 2024 23:59:55 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sa29p-0002Le-HP; Fri, 02 Aug 2024 19:58:01 -0400 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 1sa29o-0002Fm-56 for qemu-devel@nongnu.org; Fri, 02 Aug 2024 19:58:00 -0400 Received: from mail-io1-xd2c.google.com ([2607:f8b0:4864:20::d2c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sa29m-0004Kz-7o for qemu-devel@nongnu.org; Fri, 02 Aug 2024 19:57:59 -0400 Received: by mail-io1-xd2c.google.com with SMTP id ca18e2360f4ac-81fd520fee5so57865339f.2 for ; Fri, 02 Aug 2024 16:57:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20230601.gappssmtp.com; s=20230601; t=1722643076; x=1723247876; 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; bh=g3kDJhuVOCuA9YqIFpqwx9TDE8LgGOs4efk+QHLf3Y4=; b=BE+MpRiwRcM4QOanS7lGaJDEZtqKGsYRIQWOdNm/MFsOfS0BRuo0vj7hqDocFoR/CT LxtP8azy8sBFQY5fPQ/eb8sGWt4BSgGUIfLb6MyRlol/SLdRm+6YxyN4B1xCtso18Dov K8D/Vf0ScqVOJphU76Fag7/iHWY0fRLPTJYYjLXYA9gATbgOIlnh4ye5xZ3vGDywWtq7 EoU2o/T5DEswQOyQTuvr0Xzh1pnSMNztPHN2JceIPxG6A++XjfFxplVFMRStrvg6Ztsm HNHjPhQu0va8oVHsmP5WZYKZqZynRRLc12C4RFXOFCay+PXGSQU9QKNX/lH2vfi9PsK7 9zDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722643076; x=1723247876; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=g3kDJhuVOCuA9YqIFpqwx9TDE8LgGOs4efk+QHLf3Y4=; b=SiDMu4uJ0uQHYtUc8jb3AGJieEVZEF4V1N20RXE1v5I4sqoxqNct7ktfeBlnzbbZYB XktW9WYhCXJMnrZHTWuljFN74+YPdU3crnqpkTHWrQTKz8PPpJgloLWV5WrR3RZH7+bI 87fyhx1i+TbnWePgmQmreJELnOb+XzfjuWSuro63oVgy2XqwtGoe8DE4ZYEEdOZ48ZVd NFqPjYrYqb7w/1/VX5wmuoiMnPBfttW7KIHbG4ygQBku1VuZrAb6BHF08nxiXBJZqS7h pCOgWBonnRYOcLqcs7cJGRzvQM+Nv/Gn9W2toE1xIoiYFy+GRzYnUuhQef08cF5+82Bu CbGg== X-Gm-Message-State: AOJu0Yy2Y6WlYbEDLoMab25dmDGjvPpTyNp4NgajjPVAIUtSdG/iqBqv T1sPzIRSf1dLJ8GLW5py7egga8QLb8AhOdf10BN0FHD498QtSgDdm60JWQ++vEUWr3+yGTYxcCr DE/M= X-Google-Smtp-Source: AGHT+IELASuw97UAzcir4BinQoP3HvesnqYEnH2VyaF/0j3lz2iudTNLtU7/pPm3syqcaltgUWIGAw== X-Received: by 2002:a05:6602:3fcb:b0:81e:23e8:8d4 with SMTP id ca18e2360f4ac-81fd435b40bmr628481439f.6.1722643076330; Fri, 02 Aug 2024 16:57:56 -0700 (PDT) Received: from dune.bsdimp.com ([50.253.99.174]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4c8d69a8227sm683131173.47.2024.08.02.16.57.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Aug 2024 16:57:55 -0700 (PDT) From: Warner Losh To: qemu-devel@nongnu.org Cc: Warner Losh , Kyle Evans , Jessica Clarke Subject: [PATCH 16/17] bsd-user: Define validate_prot_to_pageflags and use in mprotect Date: Fri, 2 Aug 2024 17:56:16 -0600 Message-ID: <20240802235617.7971-17-imp@bsdimp.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240802235617.7971-1-imp@bsdimp.com> References: <20240802235617.7971-1-imp@bsdimp.com> MIME-Version: 1.0 Received-SPF: none client-ip=2607:f8b0:4864:20::d2c; envelope-from=imp@bsdimp.com; helo=mail-io1-xd2c.google.com 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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: 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 Define validate_prot_to_pageflags. Use it in target_mprotect to validate the flags. Our taraget_mmap needs more work before it can be used there, do don't copy linux-user's use of it there. This should hvae no net functional change, but does make target_mprotect more similar to linux-user's. Signed-off-by: Warner Losh Reviewed-by: Richard Henderson --- bsd-user/mmap.c | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-) diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c index ffecf52a72a..3c48a188e88 100644 --- a/bsd-user/mmap.c +++ b/bsd-user/mmap.c @@ -60,12 +60,26 @@ void mmap_fork_end(int child) pthread_mutex_unlock(&mmap_mutex); } +/* + * Validate target prot bitmask. + * Return the prot bitmask for the host in *HOST_PROT. + * Return 0 if the target prot bitmask is invalid, otherwise + * the internal qemu page_flags (which will include PAGE_VALID). + */ +static int validate_prot_to_pageflags(int prot) +{ + int valid = PROT_READ | PROT_WRITE | PROT_EXEC; + int page_flags = (prot & PAGE_RWX) | PAGE_VALID; + + return prot & ~valid ? 0 : page_flags; +} + /* NOTE: all the constants are the HOST ones, but addresses are target. */ int target_mprotect(abi_ulong start, abi_ulong len, int target_prot) { int host_page_size = qemu_real_host_page_size(); abi_ulong end, host_start, host_end, addr; - int prot1, ret; + int prot1, ret, page_flags; qemu_log_mask(CPU_LOG_PAGE, "mprotect: start=0x" TARGET_ABI_FMT_lx " len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c\n", start, len, @@ -74,14 +88,18 @@ int target_mprotect(abi_ulong start, abi_ulong len, int target_prot) target_prot & PROT_EXEC ? 'x' : '-'); if ((start & ~TARGET_PAGE_MASK) != 0) return -EINVAL; + page_flags = validate_prot_to_pageflags(target_prot); + if (!page_flags) { + return -TARGET_EINVAL; + } len = TARGET_PAGE_ALIGN(len); + if (len == 0) + return 0; if (!guest_range_valid_untagged(start, len)) { return -ENOMEM; } - end = start + len; target_prot &= PROT_READ | PROT_WRITE | PROT_EXEC; - if (len == 0) - return 0; + end = start + len; mmap_lock(); host_start = start & -host_page_size; @@ -122,7 +140,7 @@ int target_mprotect(abi_ulong start, abi_ulong len, int target_prot) if (ret != 0) goto error; } - page_set_flags(start, start + len - 1, target_prot | PAGE_VALID); + page_set_flags(start, start + len - 1, page_flags); mmap_unlock(); return 0; error: