| Message ID | 20230210054310.never.554-kees@kernel.org (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | bfcc8ba45eb87bfaaff900bbad2b87b204899d41 |
| Delegated to: | Kalle Valo |
| Headers | show |
| Series | wifi: ath: Silence memcpy run-time false positive warning | expand |
Kees Cook <keescook@chromium.org> wrote: > The memcpy() in ath_key_config() was attempting to write across > neighboring struct members in struct ath_keyval. Introduce a wrapping > struct_group, kv_values, to be the addressable target of the memcpy > without overflowing an individual member. Silences the false positive > run-time warning: > > memcpy: detected field-spanning write (size 32) of single field "hk.kv_val" at drivers/net/wireless/ath/key.c:506 (size 16) > > Link: https://bbs.archlinux.org/viewtopic.php?id=282254 > Cc: Kalle Valo <kvalo@kernel.org> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Eric Dumazet <edumazet@google.com> > Cc: Jakub Kicinski <kuba@kernel.org> > Cc: Paolo Abeni <pabeni@redhat.com> > Cc: linux-wireless@vger.kernel.org > Cc: netdev@vger.kernel.org > Signed-off-by: Kees Cook <keescook@chromium.org> > Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> Patch applied to ath-next branch of ath.git, thanks. bfcc8ba45eb8 wifi: ath: Silence memcpy run-time false positive warning
diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h index f083fb9038c3..f02a308a9ffc 100644 --- a/drivers/net/wireless/ath/ath.h +++ b/drivers/net/wireless/ath/ath.h @@ -96,11 +96,13 @@ struct ath_keyval { u8 kv_type; u8 kv_pad; u16 kv_len; - u8 kv_val[16]; /* TK */ - u8 kv_mic[8]; /* Michael MIC key */ - u8 kv_txmic[8]; /* Michael MIC TX key (used only if the hardware - * supports both MIC keys in the same key cache entry; - * in that case, kv_mic is the RX key) */ + struct_group(kv_values, + u8 kv_val[16]; /* TK */ + u8 kv_mic[8]; /* Michael MIC key */ + u8 kv_txmic[8]; /* Michael MIC TX key (used only if the hardware + * supports both MIC keys in the same key cache entry; + * in that case, kv_mic is the RX key) */ + ); }; enum ath_cipher { diff --git a/drivers/net/wireless/ath/key.c b/drivers/net/wireless/ath/key.c index 61b59a804e30..b7b61d4f02ba 100644 --- a/drivers/net/wireless/ath/key.c +++ b/drivers/net/wireless/ath/key.c @@ -503,7 +503,7 @@ int ath_key_config(struct ath_common *common, hk.kv_len = key->keylen; if (key->keylen) - memcpy(hk.kv_val, key->key, key->keylen); + memcpy(&hk.kv_values, key->key, key->keylen); if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) { switch (vif->type) {
The memcpy() in ath_key_config() was attempting to write across neighboring struct members in struct ath_keyval. Introduce a wrapping struct_group, kv_values, to be the addressable target of the memcpy without overflowing an individual member. Silences the false positive run-time warning: memcpy: detected field-spanning write (size 32) of single field "hk.kv_val" at drivers/net/wireless/ath/key.c:506 (size 16) Link: https://bbs.archlinux.org/viewtopic.php?id=282254 Cc: Kalle Valo <kvalo@kernel.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> --- drivers/net/wireless/ath/ath.h | 12 +++++++----- drivers/net/wireless/ath/key.c | 2 +- 2 files changed, 8 insertions(+), 6 deletions(-)