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Date: Tue, 09 May 2017 21:33:17 -0700 From: Joe Perches <joe@...ches.com> To: Kees Cook <keescook@...omium.org>, netdev@...r.kernel.org Cc: Kalle Valo <kvalo@...eaurora.org>, libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org, Daniel Micay <danielmicay@...il.com> Subject: Re: [PATCH] libertas: Avoid reading past end of buffer On Tue, 2017-05-09 at 16:23 -0700, Kees Cook wrote: > Using memcpy() from a string that is shorter than the length copied means > the destination buffer is being filled with arbitrary data from the kernel > rodata segment. Instead, use strncpy() which will fill the trailing bytes > with zeros. Additionally adjust indentation to keep checkpatch.pl happy. > > This was found with the future CONFIG_FORTIFY_SOURCE feature. [] > diff --git a/drivers/net/wireless/marvell/libertas/mesh.c b/drivers/net/wireless/marvell/libertas/mesh.c [] > @@ -1177,9 +1177,9 @@ void lbs_mesh_ethtool_get_strings(struct net_device *dev, > switch (stringset) { > case ETH_SS_STATS: > for (i = 0; i < MESH_STATS_NUM; i++) { > - memcpy(s + i * ETH_GSTRING_LEN, > - mesh_stat_strings[i], > - ETH_GSTRING_LEN); > + strncpy(s + i * ETH_GSTRING_LEN, > + mesh_stat_strings[i], > + ETH_GSTRING_LEN); > } The better solution is to declare mesh_stat_strings in in the normal way --- drivers/net/wireless/marvell/libertas/mesh.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/net/wireless/marvell/libertas/mesh.c b/drivers/net/wireless/marvell/libertas/mesh.c index d0c881dd5846..a535e7f48d2d 100644 --- a/drivers/net/wireless/marvell/libertas/mesh.c +++ b/drivers/net/wireless/marvell/libertas/mesh.c @@ -1108,15 +1108,15 @@ void lbs_mesh_set_txpd(struct lbs_private *priv, * Ethtool related */ -static const char * const mesh_stat_strings[] = { - "drop_duplicate_bcast", - "drop_ttl_zero", - "drop_no_fwd_route", - "drop_no_buffers", - "fwded_unicast_cnt", - "fwded_bcast_cnt", - "drop_blind_table", - "tx_failed_cnt" +static const char mesh_stat_strings[][ETH_GSTRING_LEN] = { + "drop_duplicate_bcast", + "drop_ttl_zero", + "drop_no_fwd_route", + "drop_no_buffers", + "fwded_unicast_cnt", + "fwded_bcast_cnt", + "drop_blind_table", + "tx_failed_cnt", }; void lbs_mesh_ethtool_get_stats(struct net_device *dev,
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