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Tue, 21 Jan 2020 12:30:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579609857; 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=gaEl8piEqPiD/Ywy09GGNeI1MpOB5XRCawXztqN1ZtY=; b=NL2py8enmbKF1b5KnASEDKSNhYP8kMc5jmxOTfRud5CyZr6cXBgi4UeVjJTcpBMIG9tiaL O/8Whl006fOo/KHLjiOQptsNIDfNfyh0ezAykbHG58Ibu2gfGNJGYrm/i/S3Yz9SI8QgQF fJmXMm/h/TfSeme9s+BT2Jsy9+My878= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com, berrange@redhat.com, slp@redhat.com, philmd@redhat.com Subject: [PATCH v2 072/109] virtiofsd: fail when parent inode isn't known in lo_do_lookup() Date: Tue, 21 Jan 2020 12:23:56 +0000 Message-Id: <20200121122433.50803-73-dgilbert@redhat.com> In-Reply-To: <20200121122433.50803-1-dgilbert@redhat.com> References: <20200121122433.50803-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: TuxXSrJyMYSooh0Ox3fLhg-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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: m.mizuma@jp.fujitsu.com, misono.tomohiro@jp.fujitsu.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: Miklos Szeredi The Linux file handle APIs (struct export_operations) can access inodes that are not attached to parents because path name traversal is not performed. Refuse if there is no parent in lo_do_lookup(). Also clean up lo_do_lookup() while we're here. Signed-off-by: Miklos Szeredi Signed-off-by: Stefan Hajnoczi Reviewed-by: Misono Tomohiro --- tools/virtiofsd/passthrough_ll.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough= _ll.c index 57be7cf007..2d2c10ada9 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -777,6 +777,15 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t par= ent, const char *name, struct lo_data *lo =3D lo_data(req); struct lo_inode *inode, *dir =3D lo_inode(req, parent); =20 + /* + * name_to_handle_at() and open_by_handle_at() can reach here with fuse + * mount point in guest, but we don't have its inode info in the + * ino_map. + */ + if (!dir) { + return ENOENT; + } + memset(e, 0, sizeof(*e)); e->attr_timeout =3D lo->timeout; e->entry_timeout =3D lo->timeout; @@ -786,7 +795,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t pare= nt, const char *name, name =3D "."; } =20 - newfd =3D openat(lo_fd(req, parent), name, O_PATH | O_NOFOLLOW); + newfd =3D openat(dir->fd, name, O_PATH | O_NOFOLLOW); if (newfd =3D=3D -1) { goto out_err; } @@ -796,7 +805,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t pare= nt, const char *name, goto out_err; } =20 - inode =3D lo_find(lo_data(req), &e->attr); + inode =3D lo_find(lo, &e->attr); if (inode) { close(newfd); newfd =3D -1; @@ -812,6 +821,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t pare= nt, const char *name, inode->is_symlink =3D S_ISLNK(e->attr.st_mode); inode->refcount =3D 1; inode->fd =3D newfd; + newfd =3D -1; inode->ino =3D e->attr.st_ino; inode->dev =3D e->attr.st_dev; =20 --=20 2.24.1