[PATCH] net: stmmac: fix out-of-bounds read via memcpy detected by KASAN
From: Ray Zhang
Date: Tue Nov 21 2023 - 13:45:56 EST
CONFIG_KASAN detected out-of-bounds read via memcpy in stmmac_get_strings.
The fix is to change memcpy to strscpy.
Tested:
<machine_obfuscated>:~# ethtool -i <interface_obfuscated>
driver: st_gmac
<machine_obfuscated>:~# ethtool -S <interface_obfuscated>
NIC statistics:
ATPES: 0
TPES: 0
RDPES: 0
MPES: 0
MTSPES: 0
ARPES: 0
CWPES: 0
ASRPES: 0
TTES: 0
RTES: 0
CTES: 0
ATES: 0
PTES: 0
T125ES: 0
R125ES: 0
RVCTES: 0
MSTTES: 0
SLVTES: 0
ATITES: 0
ARITES: 0
FSMPES: 0
TXCES: 0
TXAMS: 0
TXUES: 0
RXCES: 0
RXAMS: 0
RXUES: 0
ECES: 0
EAMS: 0
EUES: 0
RPCES: 0
RPAMS: 0
RPUES: 0
TCES: 0
TAMS: 0
TUES: 0
mmc_tx_octetcount_gb: 11612
mmc_tx_framecount_gb: 100
mmc_tx_broadcastframe_g: 0
mmc_tx_multicastframe_g: 42
mmc_tx_64_octets_gb: 0
mmc_tx_65_to_127_octets_gb: 62
mmc_tx_128_to_255_octets_gb: 38
mmc_tx_256_to_511_octets_gb: 0
mmc_tx_512_to_1023_octets_gb: 0
mmc_tx_1024_to_max_octets_gb: 0
mmc_tx_unicast_gb: 58
mmc_tx_multicast_gb: 42
mmc_tx_broadcast_gb: 0
mmc_tx_underflow_error: 0
mmc_tx_singlecol_g: 0
mmc_tx_multicol_g: 0
mmc_tx_deferred: 0
mmc_tx_latecol: 0
mmc_tx_exesscol: 0
mmc_tx_carrier_error: 0
mmc_tx_octetcount_g: 11612
mmc_tx_framecount_g: 100
mmc_tx_excessdef: 0
mmc_tx_pause_frame: 0
mmc_tx_vlan_frame_g: 0
mmc_rx_framecount_gb: 64
mmc_rx_octetcount_gb: 30235
mmc_rx_octetcount_g: 30235
mmc_rx_broadcastframe_g: 0
mmc_rx_multicastframe_g: 0
mmc_rx_crc_error: 0
mmc_rx_align_error: 0
mmc_rx_run_error: 0
mmc_rx_jabber_error: 0
mmc_rx_undersize_g: 0
mmc_rx_oversize_g: 0
mmc_rx_64_octets_gb: 0
mmc_rx_65_to_127_octets_gb: 9
mmc_rx_128_to_255_octets_gb: 22
mmc_rx_256_to_511_octets_gb: 21
mmc_rx_512_to_1023_octets_gb: 2
mmc_rx_1024_to_max_octets_gb: 10
mmc_rx_unicast_g: 64
mmc_rx_length_error: 0
mmc_rx_autofrangetype: 0
mmc_rx_pause_frames: 0
mmc_rx_fifo_overflow: 0
mmc_rx_vlan_frames_gb: 0
mmc_rx_watchdog_error: 0
mmc_rx_ipc_intr_mask: 0
mmc_rx_ipc_intr: 0
mmc_rx_ipv4_gd: 0
mmc_rx_ipv4_hderr: 0
mmc_rx_ipv4_nopay: 0
mmc_rx_ipv4_frag: 0
mmc_rx_ipv4_udsbl: 0
mmc_rx_ipv4_gd_octets: 0
mmc_rx_ipv4_hderr_octets: 0
mmc_rx_ipv4_nopay_octets: 0
mmc_rx_ipv4_frag_octets: 0
mmc_rx_ipv4_udsbl_octets: 0
mmc_rx_ipv6_gd_octets: 0
mmc_rx_ipv6_hderr_octets: 0
mmc_rx_ipv6_nopay_octets: 0
mmc_rx_ipv6_gd: 0
mmc_rx_ipv6_hderr: 0
mmc_rx_ipv6_nopay: 0
mmc_rx_udp_gd: 0
mmc_rx_udp_err: 0
mmc_rx_tcp_gd: 0
mmc_rx_tcp_err: 0
mmc_rx_icmp_gd: 0
mmc_rx_icmp_err: 0
mmc_rx_udp_gd_octets: 0
mmc_rx_udp_err_octets: 0
mmc_rx_tcp_gd_octets: 0
mmc_rx_tcp_err_octets: 0
mmc_rx_icmp_gd_octets: 0
mmc_rx_icmp_err_octets: 0
mmc_tx_fpe_fragment_cntr: 0
mmc_tx_hold_req_cntr: 0
mmc_rx_packet_assembly_err_cntr: 0
mmc_rx_packet_smd_err_cntr: 0
mmc_rx_packet_assembly_ok_cntr: 0
mmc_rx_fpe_fragment_cntr: 0
tx_underflow: 0
tx_carrier: 0
tx_losscarrier: 0
vlan_tag: 0
tx_deferred: 0
tx_vlan: 0
tx_jabber: 0
tx_frame_flushed: 0
tx_payload_error: 0
tx_ip_header_error: 0
rx_desc: 0
sa_filter_fail: 0
overflow_error: 0
ipc_csum_error: 0
rx_collision: 0
rx_crc_errors: 0
dribbling_bit: 0
rx_length: 0
rx_mii: 0
rx_multicast: 0
rx_gmac_overflow: 0
rx_watchdog: 0
da_rx_filter_fail: 0
sa_rx_filter_fail: 0
rx_missed_cntr: 0
rx_overflow_cntr: 0
rx_vlan: 0
rx_split_hdr_pkt_n: 0
tx_undeflow_irq: 0
tx_process_stopped_irq: 0
tx_jabber_irq: 0
rx_overflow_irq: 0
rx_buf_unav_irq: 0
rx_process_stopped_irq: 0
rx_watchdog_irq: 0
tx_early_irq: 0
fatal_bus_error_irq: 0
rx_early_irq: 0
threshold: 64
tx_pkt_n: 100
rx_pkt_n: 64
normal_irq_n: 62
rx_normal_irq_n: 58
napi_poll: 215
tx_normal_irq_n: 4
tx_clean: 157
tx_set_ic_bit: 4
irq_receive_pmt_irq_n: 0
mmc_tx_irq_n: 0
mmc_rx_irq_n: 0
mmc_rx_csum_offload_irq_n: 0
irq_tx_path_in_lpi_mode_n: 0
irq_tx_path_exit_lpi_mode_n: 0
irq_rx_path_in_lpi_mode_n: 0
irq_rx_path_exit_lpi_mode_n: 0
phy_eee_wakeup_error_n: 0
ip_hdr_err: 0
ip_payload_err: 0
ip_csum_bypassed: 0
ipv4_pkt_rcvd: 0
ipv6_pkt_rcvd: 64
no_ptp_rx_msg_type_ext: 64
ptp_rx_msg_type_sync: 0
ptp_rx_msg_type_follow_up: 0
ptp_rx_msg_type_delay_req: 0
ptp_rx_msg_type_delay_resp: 0
ptp_rx_msg_type_pdelay_req: 0
ptp_rx_msg_type_pdelay_resp: 0
ptp_rx_msg_type_pdelay_follow_up: 0
ptp_rx_msg_type_announce: 0
ptp_rx_msg_type_management: 0
ptp_rx_msg_pkt_reserved_type: 0
ptp_frame_type: 0
ptp_ver: 0
timestamp_dropped: 0
av_pkt_rcvd: 0
av_tagged_pkt_rcvd: 0
vlan_tag_priority_val: 0
l3_filter_match: 0
l4_filter_match: 0
l3_l4_filter_no_match: 0
irq_pcs_ane_n: 0
irq_pcs_link_n: 0
irq_rgmii_n: 0
mtl_tx_status_fifo_full: 0
mtl_tx_fifo_not_empty: 0
mmtl_fifo_ctrl: 0
mtl_tx_fifo_read_ctrl_write: 0
mtl_tx_fifo_read_ctrl_wait: 0
mtl_tx_fifo_read_ctrl_read: 0
mtl_tx_fifo_read_ctrl_idle: 0
mac_tx_in_pause: 0
mac_tx_frame_ctrl_xfer: 0
mac_tx_frame_ctrl_idle: 0
mac_tx_frame_ctrl_wait: 0
mac_tx_frame_ctrl_pause: 0
mac_gmii_tx_proto_engine: 0
mtl_rx_fifo_fill_level_full: 0
mtl_rx_fifo_fill_above_thresh: 0
mtl_rx_fifo_fill_below_thresh: 0
mtl_rx_fifo_fill_level_empty: 0
mtl_rx_fifo_read_ctrl_flush: 0
mtl_rx_fifo_read_ctrl_read_data: 0
mtl_rx_fifo_read_ctrl_status: 0
mtl_rx_fifo_read_ctrl_idle: 0
mtl_rx_fifo_ctrl_active: 0
mac_rx_frame_ctrl_fifo: 0
mac_gmii_rx_proto_engine: 0
tx_tso_frames: 0
tx_tso_nfrags: 0
mtl_est_cgce: 0
mtl_est_hlbs: 0
mtl_est_hlbf: 0
mtl_est_btre: 0
mtl_est_btrlm: 0
q0_tx_pkt_n: 100
q0_tx_irq_n: 4
q0_rx_pkt_n: 64
q0_rx_irq_n: 58
Signed-off-by: Ray Zhang <sgzhang@xxxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index f628411ae4ae..127cde8f976e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -749,23 +749,24 @@ static void stmmac_get_strings(struct net_device *dev, u32 stringset, u8 *data)
if (!stmmac_safety_feat_dump(priv,
&priv->sstats, i,
NULL, &desc)) {
- memcpy(p, desc, ETH_GSTRING_LEN);
+ strscpy(p, desc, ETH_GSTRING_LEN);
p += ETH_GSTRING_LEN;
}
}
}
if (priv->dma_cap.rmon)
for (i = 0; i < STMMAC_MMC_STATS_LEN; i++) {
- memcpy(p, stmmac_mmc[i].stat_string,
- ETH_GSTRING_LEN);
+ strscpy(p, stmmac_mmc[i].stat_string,
+ ETH_GSTRING_LEN);
p += ETH_GSTRING_LEN;
}
for (i = 0; i < STMMAC_STATS_LEN; i++) {
- memcpy(p, stmmac_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
+ strscpy(p, stmmac_gstrings_stats[i].stat_string,
+ ETH_GSTRING_LEN);
p += ETH_GSTRING_LEN;
}
for (i = 0; i < STMMAC_QSTATS; i++) {
- memcpy(p, stmmac_qstats_string[i], ETH_GSTRING_LEN);
+ strscpy(p, stmmac_qstats_string[i], ETH_GSTRING_LEN);
p += ETH_GSTRING_LEN;
}
stmmac_get_qstats_string(priv, p);
--
2.43.0.rc1.413.gea7ed67945-goog