Oracle Linux: CVE-2024-42110: ELSA-2024-5928: kernel security update (IMPORTANT) (Multiple Advisories)

Oracle Linux: CVE-2024-42110: ELSA-2024-5928:kernel security update (IMPORTANT) (Multiple Advisories)

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

07/30/2024

Created

10/18/2024

Added

10/16/2024

Modified

11/29/2024

Description

In the Linux kernel, the following vulnerability has been resolved: net: ntb_netdev: Move ntb_netdev_rx_handler() to call netif_rx() from __netif_rx() The following is emitted when using idxd (DSA) dmanegine as the data mover for ntb_transport that ntb_netdev uses. [74412.546922] BUG: using smp_processor_id() in preemptible [00000000] code: irq/52-idxd-por/14526 [74412.556784] caller is netif_rx_internal+0x42/0x130 [74412.562282] CPU: 6 PID: 14526 Comm: irq/52-idxd-por Not tainted 6.9.5 #5 [74412.569870] Hardware name: Intel Corporation ArcherCity/ArcherCity, BIOS EGSDCRB1.E9I.1752.P05.2402080856 02/08/2024 [74412.581699] Call Trace: [74412.584514]<TASK> [74412.586933]dump_stack_lvl+0x55/0x70 [74412.591129]check_preemption_disabled+0xc8/0xf0 [74412.596374]netif_rx_internal+0x42/0x130 [74412.600957]__netif_rx+0x20/0xd0 [74412.604743]ntb_netdev_rx_handler+0x66/0x150 [ntb_netdev] [74412.610985]ntb_complete_rxc+0xed/0x140 [ntb_transport] [74412.617010]ntb_rx_copy_callback+0x53/0x80 [ntb_transport] [74412.623332]idxd_dma_complete_txd+0xe3/0x160 [idxd] [74412.628963]idxd_wq_thread+0x1a6/0x2b0 [idxd] [74412.634046]irq_thread_fn+0x21/0x60 [74412.638134]? irq_thread+0xa8/0x290 [74412.642218]irq_thread+0x1a0/0x290 [74412.646212]? __pfx_irq_thread_fn+0x10/0x10 [74412.651071]? __pfx_irq_thread_dtor+0x10/0x10 [74412.656117]? __pfx_irq_thread+0x10/0x10 [74412.660686]kthread+0x100/0x130 [74412.664384]? __pfx_kthread+0x10/0x10 [74412.668639]ret_from_fork+0x31/0x50 [74412.672716]? __pfx_kthread+0x10/0x10 [74412.676978]ret_from_fork_asm+0x1a/0x30 [74412.681457]</TASK> The cause is due to the idxd driver interrupt completion handler uses threaded interrupt and the threaded handler is not hard or soft interrupt context. However __netif_rx() can only be called from interrupt context. Change the call to netif_rx() in order to allow completion via normal context for dmaengine drivers that utilize threaded irq handling. While the following commit changed from netif_rx() to __netif_rx(), baebdf48c360 ("net: dev: Makes sure netif_rx() can be invoked in any context."), the change should've been a noop instead. However, the code precedes this fix should've been using netif_rx_ni() or netif_rx_any_context().

Solution(s)

• oracle-linux-upgrade-kernel

References

• https://attackerkb.com/topics/cve-2024-42110
• CVE - 2024-42110
• ELSA-2024-5928