On Thu, Mar 01, 2012 at 10:39:03PM +0530, santosh nayak wrote: > From: Santosh Nayak <santoshprasadnayak@xxxxxxxxx> > > user-space ebtables expects 32 bytes-long names, but xt_match uses > 29 bytes. Fill the remaining bytes with zeroes. > > Signed-off-by: Santosh Nayak <santoshprasadnayak@xxxxxxxxx> > --- > net/bridge/netfilter/ebtables.c | 14 +++++++++++--- > 1 files changed, 11 insertions(+), 3 deletions(-) > > diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c > index 5864cc4..21f337a 100644 > --- a/net/bridge/netfilter/ebtables.c > +++ b/net/bridge/netfilter/ebtables.c > @@ -1335,7 +1335,10 @@ static inline int ebt_make_matchname(const struct ebt_entry_match *m, > const char *base, char __user *ubase) > { > char __user *hlp = ubase + ((char *)m - base); > - if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN)) > + char name[EBT_FUNCTION_MAXNAMELEN] = {}; > + > + strncpy(name, m->u.match->name, sizeof(name)); > + if (copy_to_user(hlp, name, EBT_FUNCTION_MAXNAMELEN)) > return -EFAULT; > return 0; > } > @@ -1344,7 +1347,10 @@ static inline int ebt_make_watchername(const struct ebt_entry_watcher *w, > const char *base, char __user *ubase) > { > char __user *hlp = ubase + ((char *)w - base); > - if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN)) > + char name[EBT_FUNCTION_MAXNAMELEN] = {}; > + > + strncpy(name, w->u.watcher->name, sizeof(name)); > + if (copy_to_user(hlp , name, EBT_FUNCTION_MAXNAMELEN)) > return -EFAULT; > return 0; > } > @@ -1355,10 +1361,12 @@ ebt_make_names(struct ebt_entry *e, const char *base, char __user *ubase) > int ret; > char __user *hlp; > const struct ebt_entry_target *t; > + char name[EBT_FUNCTION_MAXNAMELEN] = {}; > > if (e->bitmask == 0) > return 0; > > + strncpy(name, t->u.target->name, sizeof(name)); > hlp = ubase + (((char *)e + e->target_offset) - base); > t = (struct ebt_entry_target *)(((char *)e) + e->target_offset); This is broken, t dereference is incorrect. Unfortunately I've applied your patch. I'll apply a patch to fix this upon it. -- 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