CVE: CVE-2024-35909
Published: 2024-05-19
Description: In the Linux kernel, the following vulnerability has been resolved:

net: wwan: t7xx: Split 64bit accesses to fix alignment issues

Some of the registers are aligned on a 32bit boundary, causing
alignment faults on 64bit platforms.

 Unable to handle kernel paging request at virtual address ffffffc084a1d004
 Mem abort info:
 ESR = 0x[PII_REDACTED]000061
 EC = 0x25: DABT (current EL), IL = 32 bits
 SET = 0, FnV = 0
 EA = 0, S1PTW = 0
 FSC = 0x21: alignment fault
 Data abort info:
 ISV = 0, ISS = 0x00000061, ISS2 = 0x00000000
 CM = 0, WnR = 1, TnD = 0, TagAccess = 0
 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
 swapper pgtable: 4k pages, 39-bit VAs, pgdp=[PII_REDACTED]ad6000
 [ffffffc084a1d004] pgd=100000013ffff003, p4d=100000013ffff003, pud=100000013ffff003, pmd=[PII_REDACTED]a00711
 Internal error: Oops: [PII_REDACTED] [#1] SMP
 Modules linked in: mtk_t7xx(+) qcserial pppoe ppp_async option nft_fib_inet nf_flow_table_inet mt7921u(O) mt7921s(O) mt7921e(O) mt7921_common(O) iwlmvm(O) iwldvm(O) usb_wwan rndis_host qmi_wwan pppox ppp_generic nft_reject_ipv6 nft_reject_ipv4 nft_reject_inet nft_reject nft_redir nft_quota nft_numgen nft_nat nft_masq nft_log nft_limit nft_hash nft_flow_offload nft_fib_ipv6 nft_fib_ipv4 nft_fib nft_ct nft_chain_nat nf_tables nf_nat nf_flow_table nf_conntrack mt7996e(O) mt792x_usb(O) mt792x_lib(O) mt7915e(O) mt76_usb(O) mt76_sdio(O) mt76_connac_lib(O) mt76(O) mac80211(O) iwlwifi(O) huawei_cdc_ncm cfg80211(O) cdc_ncm cdc_ether wwan usbserial usbnet slhc sfp rtc_pcf8563 nfnetlink nf_reject_ipv6 nf_reject_ipv4 nf_log_syslog nf_defrag_ipv6 nf_defrag_ipv4 mt6577_auxadc mdio_i2c libcrc32c compat(O) cdc_wdm cdc_acm at24 crypto_safexcel pwm_fan i2c_gpio i2c_smbus industrialio i2c_algo_bit i2c_mux_reg i2c_mux_pca954x i2c_mux_pca9541 i2c_mux_gpio i2c_mux dummy oid_registry tun sha512_arm64 sha1_ce sha1_generic seqiv
 md5 geniv des_generic libdes cbc authencesn authenc leds_gpio xhci_plat_hcd xhci_pci xhci_mtk_hcd xhci_hcd nvme nvme_core gpio_button_hotplug(O) dm_mirror dm_region_hash dm_log dm_crypt dm_mod dax usbcore usb_common ptp aquantia pps_core mii tpm encrypted_keys trusted
 CPU: 3 PID: 5266 Comm: kworker/u9:1 Tainted: G O 6.6.22 #0
 Hardware name: Bananapi BPI-R4 (DT)
 Workqueue: md_hk_wq t7xx_fsm_uninit [mtk_t7xx]
 pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : t7xx_cldma_hw_set_start_addr+0x1c/0x3c [mtk_t7xx]
 lr : t7xx_cldma_start+0xac/0x13c [mtk_t7xx]
 sp : ffffffc085d63d30
 x29: ffffffc085d63d30 x28: [PII_REDACTED] x27: [PII_REDACTED]
 x26: [PII_REDACTED] x25: ffffff80c804f2c0 x24: ffffff80ca196c05
 x23: [PII_REDACTED] x22: ffffff80c814b9b8 x21: ffffff80c814b128
 x20: [PII_REDACTED] x19: ffffff80c814b080 x18: [PII_REDACTED]
 x17:[PII_REDACTED]c9806b x16: 000000007c5296d0 x15: 000000000f6bca68
 x14: 00000000dbdbdce4 x13: 000000001aeaf72a x12: [PII_REDACTED]
 x11: [PII_REDACTED] x10: [PII_REDACTED] x9 : [PII_REDACTED]
 x8 : ffffff80ca1ef6b4 x7 : ffffff80c814b818 x6 : [PII_REDACTED]
 x5 : [PII_REDACTED] x4 : [PII_REDACTED] x3 : [PII_REDACTED]
 x2 : 000000010a947000 x1 : ffffffc084a1d004 x0 : ffffffc084a1d004
 Call trace:
 t7xx_cldma_hw_set_start_addr+0x1c/0x3c [mtk_t7xx]
 t7xx_fsm_uninit+0x578/0x5ec [mtk_t7xx]
 process_one_work+0x154/0x2a0
 worker_thread+0x2ac/0x488
 kthread+0xe0/0xec
 ret_from_fork+0x10/0x20
 Code: f9[PII_REDACTED]1000 8b214001 d50332bf (f9000022)
 ---[ end trace [PII_REDACTED] ]---

The inclusion of io-64-nonatomic-lo-hi.h indicates that all 64bit
accesses can be replaced by pairs of nonatomic 32bit access.  Fix
alignment by forcing all accesses to be 32bit on 64bit platforms.
CVSS Score: 5.5 (MEDIUM)
References: https://git.kernel.org/stable/c/2e22c9cb618716b8e557fe17c3d[PII_REDACTED]082; https://git.kernel.org/stable/c/7d5a7dd5a35876f0ecc286f3602a88887a788217; https://git.kernel.org/stable/c/b4fdb3c197e35f655b2d9b6759ce29440eacdfda