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CVE: CVE-2018-16872
Upstream-Status: Backport [https://git.qemu.org/?p=qemu.git;a=commit;h=bab9df35]
Signed-off-by: Kai Kang <kai.kang@windriver.com>
From bab9df35ce73d1c8e19a37e2737717ea1c984dc1 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 13 Dec 2018 13:25:11 +0100
Subject: [PATCH] usb-mtp: use O_NOFOLLOW and O_CLOEXEC.
Open files and directories with O_NOFOLLOW to avoid symlinks attacks.
While being at it also add O_CLOEXEC.
usb-mtp only handles regular files and directories and ignores
everything else, so users should not see a difference.
Because qemu ignores symlinks, carrying out a successful symlink attack
requires swapping an existing file or directory below rootdir for a
symlink and winning the race against the inotify notification to qemu.
Fixes: CVE-2018-16872
Cc: Prasad J Pandit <ppandit@redhat.com>
Cc: Bandan Das <bsd@redhat.com>
Reported-by: Michael Hanselmann <public@hansmi.ch>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael Hanselmann <public@hansmi.ch>
Message-id: 20181213122511.13853-1-kraxel@redhat.com
---
hw/usb/dev-mtp.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c
index 100b7171f4..36c43b8c20 100644
--- a/hw/usb/dev-mtp.c
+++ b/hw/usb/dev-mtp.c
@@ -653,13 +653,18 @@ static void usb_mtp_object_readdir(MTPState *s, MTPObject *o)
{
struct dirent *entry;
DIR *dir;
+ int fd;
if (o->have_children) {
return;
}
o->have_children = true;
- dir = opendir(o->path);
+ fd = open(o->path, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW);
+ if (fd < 0) {
+ return;
+ }
+ dir = fdopendir(fd);
if (!dir) {
return;
}
@@ -1007,7 +1012,7 @@ static MTPData *usb_mtp_get_object(MTPState *s, MTPControl *c,
trace_usb_mtp_op_get_object(s->dev.addr, o->handle, o->path);
- d->fd = open(o->path, O_RDONLY);
+ d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
if (d->fd == -1) {
usb_mtp_data_free(d);
return NULL;
@@ -1031,7 +1036,7 @@ static MTPData *usb_mtp_get_partial_object(MTPState *s, MTPControl *c,
c->argv[1], c->argv[2]);
d = usb_mtp_data_alloc(c);
- d->fd = open(o->path, O_RDONLY);
+ d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
if (d->fd == -1) {
usb_mtp_data_free(d);
return NULL;
@@ -1658,7 +1663,7 @@ static void usb_mtp_write_data(MTPState *s)
0, 0, 0, 0);
goto done;
}
- d->fd = open(path, O_CREAT | O_WRONLY, mask);
+ d->fd = open(path, O_CREAT | O_WRONLY | O_CLOEXEC | O_NOFOLLOW, mask);
if (d->fd == -1) {
usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
0, 0, 0, 0);
--
2.20.1
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