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niu: Fix kernel buffer overflow for ETHTOOL_GRXCLSRLALL 

niu_get_ethtool_tcam_all() assumes that its output buffer is the right
size, and warns before returning if it is not.  However, the output
buffer size is under user control and ETHTOOL_GRXCLSRLALL is an
unprivileged ethtool command.  Therefore this is at least a local
denial-of-service vulnerability.

Change it to check before writing each entry and to return an error if
the buffer is already full.

Compile-tested only.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2010-09-07 04:35:19 +00:00 committed by David S. Miller
parent 6523ce1525
commit ee9c5cfad2
1 changed files with 6 additions and 10 deletions
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16
drivers/net/niu.c
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@ -7272,32 +7272,28 @@ static int niu_get_ethtool_tcam_all(struct niu *np,
struct niu_parent *parent = np->parent;
struct niu_tcam_entry *tp;
int i, idx, cnt;
u16 n_entries;
unsigned long flags;
int ret = 0;
/* put the tcam size here */
nfc->data = tcam_get_size(np);
niu_lock_parent(np, flags);
n_entries = nfc->rule_cnt;
for (cnt = 0, i = 0; i < nfc->data; i++) {
idx = tcam_get_index(np, i);
tp = &parent->tcam[idx];
if (!tp->valid)
continue;
if (cnt == nfc->rule_cnt) {
ret = -EMSGSIZE;
break;
}
rule_locs[cnt] = i;
cnt++;
}
niu_unlock_parent(np, flags);
if (n_entries != cnt) {
/* print warning, this should not happen */
netdev_info(np->dev, "niu%d: In %s(): n_entries[%d] != cnt[%d]!!!\n",
np->parent->index, __func__, n_entries, cnt);
}
return 0;
return ret;
}
static int niu_get_nfc(struct net_device *dev, struct ethtool_rxnfc *cmd,