Description

In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: dvm: Fix memcpy: detected field-spanning write backtrace A received TKIP key may be up to 32 bytes because it may contain MIC rx/tx keys too. These are not used by iwl and copying these over overflows the iwl_keyinfo.key field. Add a check to not copy more data to iwl_keyinfo.key then will fit. This fixes backtraces like this one: memcpy: detected field-spanning write (size 32) of single field "sta_cmd.key.key" at drivers/net/wireless/intel/iwlwifi/dvm/sta.c:1103 (size 16) WARNING: CPU: 1 PID: 946 at drivers/net/wireless/intel/iwlwifi/dvm/sta.c:1103 iwlagn_send_sta_key+0x375/0x390 [iwldvm] <snip> Hardware name: Dell Inc. Latitude E6430/0H3MT5, BIOS A21 05/08/2017 RIP: 0010:iwlagn_send_sta_key+0x375/0x390 [iwldvm] <snip> Call Trace: <TASK> iwl_set_dynamic_key+0x1f0/0x220 [iwldvm] iwlagn_mac_set_key+0x1e4/0x280 [iwldvm] drv_set_key+0xa4/0x1b0 [mac80211] ieee80211_key_enable_hw_accel+0xa8/0x2d0 [mac80211] ieee80211_key_replace+0x22d/0x8e0 [mac80211] <snip>

References 8

• git.kernel.org https://git.kernel.org/stable/c/3ed3c1c2fc3482b72e755820261779cd2e2c5a3e
• git.kernel.org https://git.kernel.org/stable/c/57189c885149825be8eb8c3524b5af017fdeb941
• git.kernel.org https://git.kernel.org/stable/c/6cd644f66b43709816561d63e0173cb0c7aab159
• git.kernel.org https://git.kernel.org/stable/c/76b5ea43ad2fb4f726ddfaff839430a706e7d7c2
• git.kernel.org https://git.kernel.org/stable/c/87940e4030e4705e1f3fd2bbb1854eae8308314b
• git.kernel.org https://git.kernel.org/stable/c/91ad1ab3cc7e981cb6d6ee100686baed64e1277e
• git.kernel.org https://git.kernel.org/stable/c/ef16799640865f937719f0771c93be5dca18adc6
• git.kernel.org https://git.kernel.org/stable/c/fa57021262e998e2229d6383b1081638df2fe238

Remediation