qemu-kvm/SOURCES/kvm-virtiofsd-prevent-.-escape-in-lo_do_lookup.patch

55 lines
1.9 KiB
Diff

From feb005dfeb15dd5ac5156c994f323ab4c573b1fc Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Mon, 27 Jan 2020 19:01:24 +0100
Subject: [PATCH 053/116] virtiofsd: prevent ".." escape in lo_do_lookup()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20200127190227.40942-50-dgilbert@redhat.com>
Patchwork-id: 93500
O-Subject: [RHEL-AV-8.2 qemu-kvm PATCH 049/112] virtiofsd: prevent ".." escape in lo_do_lookup()
Bugzilla: 1694164
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
From: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 854684bc0b3d63eb90b3abdfe471c2e4271ef176)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
tools/virtiofsd/passthrough_ll.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index e375406..79d5966 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -624,12 +624,17 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
int res;
int saverr;
struct lo_data *lo = lo_data(req);
- struct lo_inode *inode;
+ struct lo_inode *inode, *dir = lo_inode(req, parent);
memset(e, 0, sizeof(*e));
e->attr_timeout = lo->timeout;
e->entry_timeout = lo->timeout;
+ /* Do not allow escaping root directory */
+ if (dir == &lo->root && strcmp(name, "..") == 0) {
+ name = ".";
+ }
+
newfd = openat(lo_fd(req, parent), name, O_PATH | O_NOFOLLOW);
if (newfd == -1) {
goto out_err;
--
1.8.3.1