On Mon, Feb 20, 2017 at 03:42:11PM +0100, Greg Kurz wrote: > The local_link() callback is vulnerable to symlink attacks because it calls: > > (1) link() which follows symbolic links for all path elements but the > rightmost one > (2) local_create_mapped_attr_dir()->mkdir() which follows symbolic links > for all path elements but the rightmost one > > This patch converts local_link() to rely on opendir_nofollow() and linkat() > to fix (1), mkdirat() to fix (2). > > This partly fixes CVE-2016-9602. > > Signed-off-by: Greg Kurz <gr...@kaod.org> > --- > hw/9pfs/9p-local.c | 86 > ++++++++++++++++++++++++++++++++++------------------ > 1 file changed, 57 insertions(+), 29 deletions(-)
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
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