From nobody Mon May 6 13:36:02 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1592935053; cv=none; d=zohomail.com; s=zohoarc; b=kKWE9lC0Tsr2iFtidfjsIYvAMtqa2SLJfj82+a4CZy0666LK0XVRul4ysV588fhB8sInqYlYOucqjFKsR4JOAmcmOT3DYf17JNj3Cafy1+TJSUfF0cC7BdPczydwlhN9gIFg3pmFwTMzsVUbbI6nhEvnYq7iao5t/vOQx7oMvLE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1592935053; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=Is2tIf/0DtLHm8mVWWn82hWvvU03LrDXNghp6ja0Zdw=; b=Q8ToDt5W8Q2cCdxjtzI9rhulvvAwmq3VBoI6csm0416nmmDYGlE+me5dTP/7Zjlz43nJmZ4zySGJjQqsnh/Y3biqhcMipTy+6omjtoOTrAf5fQOl0bpv1Jc3UYyyW5b25LUf9PmSNdpsIrfHGVKhyGCqeI8oF/bzWqe8AGXA/Ao= ARC-Authentication-Results: i=1; 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Tue, 23 Jun 2020 13:56:06 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-375-wODfEqFEMdiC6HtJeFfl9g-1; Tue, 23 Jun 2020 13:55:59 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 47222100A61E; Tue, 23 Jun 2020 17:55:57 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-115-78.ams2.redhat.com [10.36.115.78]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2161C71688; Tue, 23 Jun 2020 17:55:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592934963; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Is2tIf/0DtLHm8mVWWn82hWvvU03LrDXNghp6ja0Zdw=; b=eKGT/JyePkgOWR7pTGpOQIBrnu4/CJkFq62JpsSVVJvSpBvwr+QLs8w2R7IPTE/GohP2MF 9E+UhdvcIgYeveqQWg2lUsfAAYTs4AgwBnkNkKw8b/pA2VpZ7s8rQLBbt8/3kGb7rW60Ee 6BGEWjKMKal8ZqA6OJHkjYWjSRhlzVw= X-MC-Unique: wODfEqFEMdiC6HtJeFfl9g-1 From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PATCH 1/2] vvfat: Check that updated filenames are valid Date: Tue, 23 Jun 2020 19:55:33 +0200 Message-Id: <20200623175534.38286-2-kwolf@redhat.com> In-Reply-To: <20200623175534.38286-1-kwolf@redhat.com> References: <20200623175534.38286-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=207.211.31.120; envelope-from=kwolf@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/23 02:55:19 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, nhuck15@gmail.com, qemu-devel@nongnu.org, ppandit@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" FAT allows only a restricted set of characters in file names, and for some of the illegal characters, it's actually important that we catch them: If filenames can contain '/', the guest can construct filenames containing "../" and escape from the assigned vvfat directory. The same problem could arise if ".." was ever accepted as a literal filename. Fix this by adding a check that all filenames are valid in check_directory_consistency(). Reported-by: Nathan Huckleberry Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake --- block/vvfat.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/block/vvfat.c b/block/vvfat.c index c65a98e3ee..2fab371258 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -520,6 +520,25 @@ static void set_begin_of_direntry(direntry_t* direntry= , uint32_t begin) direntry->begin_hi =3D cpu_to_le16((begin >> 16) & 0xffff); } =20 +static bool valid_filename(const unsigned char *name) +{ + unsigned char c; + if (!strcmp((const char*)name, ".") || !strcmp((const char*)name, ".."= )) { + return false; + } + for (; (c =3D *name); name++) { + if (!((c >=3D '0' && c <=3D '9') || + (c >=3D 'A' && c <=3D 'Z') || + (c >=3D 'a' && c <=3D 'z') || + c > 127 || + strchr("$%'-_@~`!(){}^#&.+,;=3D[]", c) !=3D 0)) + { + return false; + } + } + return true; +} + static uint8_t to_valid_short_char(gunichar c) { c =3D g_unichar_toupper(c); @@ -2098,6 +2117,10 @@ DLOG(fprintf(stderr, "check direntry %d:\n", i); pri= nt_direntry(direntries + i)) } lfn.checksum =3D 0x100; /* cannot use long name twice */ =20 + if (!valid_filename(lfn.name)) { + fprintf(stderr, "Invalid file name\n"); + goto fail; + } if (path_len + 1 + lfn.len >=3D PATH_MAX) { fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name); goto fail; --=20 2.25.4 From nobody Mon May 6 13:36:02 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1592935061; cv=none; d=zohomail.com; s=zohoarc; b=iaaVmLiysYkvCQuN9NWXeHa6CYNCgBA+vlgPbW8ldj22emkkntjXj64ishPdNSNV382CXHAPFT5kzH2e1hiiRHbM+rNdpgN4pO6xq4MGFh/MGcroOy1zLVCEA9wME/pF4ULX1wGVy0kJ/KrTW9PF7krF7BHNHpDi2Xc+TPAGhD8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1592935061; 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Tue, 23 Jun 2020 17:55:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592934973; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=FgdQVUU+c96FREVYYy6jwZmKqe+mIDuQTqsn1ngJqEw=; b=B/jQNGYjQSPYLfb5oD3UbTrarmlRnSSI2bYwygQHVwiMV9FF4uj52eryjKyqtVgaTJVbuh jXLyzTcqKrWRkoKsrTUhGTaU/9wcyISolr9qDiILIKtxP8rf24FTY0kw/Rho9gcTNy1VqO Ck01f3Vuws1j3Bni8QkLrUqJmvQazbs= X-MC-Unique: W5niruuhPbys0Amc5VqEeg-1 From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PATCH 2/2] vvfat: Fix array_remove_slice() Date: Tue, 23 Jun 2020 19:55:34 +0200 Message-Id: <20200623175534.38286-3-kwolf@redhat.com> In-Reply-To: <20200623175534.38286-1-kwolf@redhat.com> References: <20200623175534.38286-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; 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charset="utf-8" array_remove_slice() calls array_roll() with array->next - 1 as the destination index. This is only correct for count =3D=3D 1, otherwise we're writing past the end of the array. array->next - count would be correct. However, this is the only place ever calling array_roll(), so this rather complicated operation isn't even necessary. Fix the problem and simplify the code by replacing it with a single memmove() call. array_roll() can now be removed. Reported-by: Nathan Huckleberry Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake --- block/vvfat.c | 42 +++++------------------------------------- 1 file changed, 5 insertions(+), 37 deletions(-) diff --git a/block/vvfat.c b/block/vvfat.c index 2fab371258..d6e464c595 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -140,48 +140,16 @@ static inline void* array_insert(array_t* array,unsig= ned int index,unsigned int return array->pointer+index*array->item_size; } =20 -/* this performs a "roll", so that the element which was at index_from bec= omes - * index_to, but the order of all other elements is preserved. */ -static inline int array_roll(array_t* array,int index_to,int index_from,in= t count) -{ - char* buf; - char* from; - char* to; - int is; - - if(!array || - index_to<0 || index_to>=3Darray->next || - index_from<0 || index_from>=3Darray->next) - return -1; - - if(index_to=3D=3Dindex_from) - return 0; - - is=3Darray->item_size; - from=3Darray->pointer+index_from*is; - to=3Darray->pointer+index_to*is; - buf=3Dg_malloc(is*count); - memcpy(buf,from,is*count); - - if(index_to=3D0); assert(count > 0); assert(index + count <=3D array->next); - if(array_roll(array,array->next-1,index,count)) - return -1; + + memmove(array->pointer + index * array->item_size, + array->pointer + (index + count) * array->item_size, + (array->next - index - count) * array->item_size); + array->next -=3D count; return 0; } --=20 2.25.4