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R. Silva" To: Gregory Greenman , Kalle Valo , Haim Dreyfuss , Johannes Berg Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH v2] wifi: iwlwifi: mvm: Fix -Warray-bounds bug in iwl_mvm_wait_d3_notif() Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org kmemdup() at line 2735 is not duplicating enough memory for notif->tid_tear_down and notif->station_id. As it only duplicates 612 bytes: up to offsetofend(struct iwl_wowlan_info_notif, received_beacons), this is the range of [0, 612) bytes. 2735 notif =3D kmemdup(notif_v1, 2736 offsetofend(struct iwl_wowlan_info_notif, 2737 received_beacons), 2738 GFP_ATOMIC); which evidently does not cover bytes 612 and 613 for members tid_tear_down and station_id in struct iwl_wowlan_info_notif. See below: $ pahole -C iwl_wowlan_info_notif drivers/net/wireless/intel/iwlwifi/mvm/d3= .o struct iwl_wowlan_info_notif { struct iwl_wowlan_gtk_status_v3 gtk[2]; /* 0 488 */ /* --- cacheline 7 boundary (448 bytes) was 40 bytes ago --- */ struct iwl_wowlan_igtk_status igtk[2]; /* 488 80 */ /* --- cacheline 8 boundary (512 bytes) was 56 bytes ago --- */ __le64 replay_ctr; /* 568 8 */ /* --- cacheline 9 boundary (576 bytes) --- */ __le16 pattern_number; /* 576 2 */ __le16 reserved1; /* 578 2 */ __le16 qos_seq_ctr[8]; /* 580 16 */ __le32 wakeup_reasons; /* 596 4 */ __le32 num_of_gtk_rekeys; /* 600 4 */ __le32 transmitted_ndps; /* 604 4 */ __le32 received_beacons; /* 608 4 */ u8 tid_tear_down; /* 612 1 */ u8 station_id; /* 613 1 */ u8 reserved2[2]; /* 614 2 */ /* size: 616, cachelines: 10, members: 13 */ /* last cacheline: 40 bytes */ }; Therefore, when the following assignments take place, actually no memory has been allocated for those objects: 2743 notif->tid_tear_down =3D notif_v1->tid_tear_down; 2744 notif->station_id =3D notif_v1->station_id; Fix this by allocating space for the whole notif object and zero out the remaining space in memory after member station_id. This also fixes the following -Warray-bounds issues: CC drivers/net/wireless/intel/iwlwifi/mvm/d3.o drivers/net/wireless/intel/iwlwifi/mvm/d3.c: In function =E2=80=98iwl_mvm_w= ait_d3_notif=E2=80=99: drivers/net/wireless/intel/iwlwifi/mvm/d3.c:2743:30: warning: array subscri= pt =E2=80=98struct iwl_wowlan_info_notif[0]=E2=80=99 is partly outside arra= y bounds of =E2=80=98unsigned char[612]=E2=80=99 [-Warray-bounds=3D] 2743 | notif->tid_tear_down =3D notif_v1->tid_tear= _down; | from drivers/net/wireless/intel/iwlwifi/mvm/d3.c:7: In function =E2=80=98kmemdup=E2=80=99, inlined from =E2=80=98iwl_mvm_wait_d3_notif=E2=80=99 at drivers/net/wir= eless/intel/iwlwifi/mvm/d3.c:2735:12: include/linux/fortify-string.h:765:16: note: object of size 612 allocated b= y =E2=80=98__real_kmemdup=E2=80=99 765 | return __real_kmemdup(p, size, gfp); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/wireless/intel/iwlwifi/mvm/d3.c: In function =E2=80=98iwl_mvm_w= ait_d3_notif=E2=80=99: drivers/net/wireless/intel/iwlwifi/mvm/d3.c:2744:30: warning: array subscri= pt =E2=80=98struct iwl_wowlan_info_notif[0]=E2=80=99 is partly outside arra= y bounds of =E2=80=98unsigned char[612]=E2=80=99 [-Warray-bounds=3D] 2744 | notif->station_id =3D notif_v1->station_id; | ^~ In function =E2=80=98kmemdup=E2=80=99, inlined from =E2=80=98iwl_mvm_wait_d3_notif=E2=80=99 at drivers/net/wir= eless/intel/iwlwifi/mvm/d3.c:2735:12: include/linux/fortify-string.h:765:16: note: object of size 612 allocated b= y =E2=80=98__real_kmemdup=E2=80=99 765 | return __real_kmemdup(p, size, gfp); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ Link: https://github.com/KSPP/linux/issues/306 Fixes: 905d50ddbc83 ("wifi: iwlwifi: mvm: support wowlan info notification = version 2") Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva Acked-by: Gregory Greenman --- Changes in v2: - Use sizeof(*notif), instead of sizeof(struct iwl_wowlan_info_notif). - Fix typo in the changelog text s/bouds/bounds. v1: - Link: https://lore.kernel.org/linux-hardening/ZHpEjTmBys5cCOGZ@work/ drivers/net/wireless/intel/iwlwifi/mvm/d3.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wire= less/intel/iwlwifi/mvm/d3.c index 37aa4676dc94..6d1007f24b4a 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c @@ -2732,17 +2732,13 @@ static bool iwl_mvm_wait_d3_notif(struct iwl_notif_= wait_data *notif_wait, if (wowlan_info_ver < 2) { struct iwl_wowlan_info_notif_v1 *notif_v1 =3D (void *)pkt->data; =20 - notif =3D kmemdup(notif_v1, - offsetofend(struct iwl_wowlan_info_notif, - received_beacons), - GFP_ATOMIC); - + notif =3D kmemdup(notif_v1, sizeof(*notif), GFP_ATOMIC); if (!notif) return false; =20 notif->tid_tear_down =3D notif_v1->tid_tear_down; notif->station_id =3D notif_v1->station_id; - + memset_after(notif, 0, station_id); } else { notif =3D (void *)pkt->data; } --=20 2.34.1