nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()

Overview

In the Linux kernel, the following vulnerability has been resolved:

nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()

nvmet_auth_challenge() receives its output buffer as a void pointer. sizeof(*d) therefore evaluates to one with GCC and undercounts the fixed challenge header by 15 bytes. A short AUTH_RECEIVE buffer can pass the check before the challenge is copied past the end of its allocation.

Use the typed challenge pointer when calculating the response size.

BUG: KASAN: slab-out-of-bounds in nvmet_execute_auth_receive (drivers/nvme/target/fabrics-cmd-auth.c:442 drivers/nvme/target/fabrics-cmd-auth.c:569) Write of size 32 by task kworker/1:1H/64 Workqueue: nvmet_tcp_wq nvmet_tcp_io_work Call Trace: nvmet_execute_auth_receive (drivers/nvme/target/fabrics-cmd-auth.c:442 drivers/nvme/target/fabrics-cmd-auth.c:569) nvmet_tcp_try_recv_pdu (drivers/nvme/target/tcp.c:1119 drivers/nvme/target/tcp.c:1243) nvmet_tcp_io_work (drivers/nvme/target/tcp.c:1350 drivers/nvme/target/tcp.c:1382 drivers/nvme/target/tcp.c:1445) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) The buggy address is located 16 bytes inside of allocated 33-byte region [ffff888000554e80, ffff888000554ea1) Kernel panic - not syncing: KASAN: panic_on_warn set ...

Affected

• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 9d61131acd742cf97ee64e453383e41b46568513
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 7fd3c363eba4f2aceb4b3f31cd1cf65e0dcbaee4
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 8a9b4c0eef19c207663c1ee888257307c869ca86
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < fa6778e030bed9841ddcdf96bc7018da9ac03562
• Linux 6.0

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.