diff options
Diffstat (limited to 'gnu/packages/patches/qemu-CVE-2018-16872.patch')
| -rw-r--r-- | gnu/packages/patches/qemu-CVE-2018-16872.patch | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/gnu/packages/patches/qemu-CVE-2018-16872.patch b/gnu/packages/patches/qemu-CVE-2018-16872.patch new file mode 100644 index 0000000000..094e823ee4 --- /dev/null +++ b/gnu/packages/patches/qemu-CVE-2018-16872.patch @@ -0,0 +1,88 @@ +Fixes CVE-2018-16872: + +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16872 + +Patch copied from upstream source repository: + +https://git.qemu.org/?p=qemu.git;a=commitdiff;h=bab9df35ce73d1c8e19a37e2737717ea1c984dc1 + +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 + |