On Sat, 2010-10-30 at 18:26 +0400, Vasiliy Kulikov wrote: > al_hreq is copied from userland. If al_hreq.buflen is not properly aligned then > xfs_attr_list will ignore the last bytes of kbuf. These bytes are unitialized. > It leads to leaking of contents of kernel stack memory. > > Signed-off-by: Vasiliy Kulikov <segooon@xxxxxxxxx> > --- > Compile tested. > > fs/xfs/linux-2.6/xfs_ioctl.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c > index 2ea238f..ad442d9 100644 > --- a/fs/xfs/linux-2.6/xfs_ioctl.c > +++ b/fs/xfs/linux-2.6/xfs_ioctl.c > @@ -416,7 +416,7 @@ xfs_attrlist_by_handle( > if (IS_ERR(dentry)) > return PTR_ERR(dentry); > > - kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL); > + kbuf = kzalloc(al_hreq.buflen, GFP_KERNEL); > if (!kbuf) > goto out_dput; > Looks good. I will take this in and will send it to Linus for 2.6.37. Thanks. Reviewed-by: Alex Elder <aelder@xxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
