diff options
Diffstat (limited to 'meta/recipes-devtools/qemu/qemu/CVE-2018-16872.patch')
-rw-r--r-- | meta/recipes-devtools/qemu/qemu/CVE-2018-16872.patch | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2018-16872.patch b/meta/recipes-devtools/qemu/qemu/CVE-2018-16872.patch new file mode 100644 index 0000000000..9f2c5d3ec1 --- /dev/null +++ b/meta/recipes-devtools/qemu/qemu/CVE-2018-16872.patch @@ -0,0 +1,89 @@ +From 7347a04da35ec6284ce83e8bcd72dc4177d17b10 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 +(cherry picked from commit bab9df35ce73d1c8e19a37e2737717ea1c984dc1) +Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> + +Upstream-Status: Backport +CVE: CVE-2018-16872 +Affects: < 3.1.0 + +Signed-off-by: Armin Kuster <akuster@mvista.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 899c8a3..f4223fb 100644 +--- a/hw/usb/dev-mtp.c ++++ b/hw/usb/dev-mtp.c +@@ -649,13 +649,18 @@ 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; + } +@@ -1003,7 +1008,7 @@ 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; +@@ -1027,7 +1032,7 @@ 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; +@@ -1608,7 +1613,7 @@ 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); +-- +2.7.4 + |