CVE-2024-42110: net: ntb_netdev: Move ntb_netdev_rx_handler() to call netif_rx() from __netif_rx()
First published: Tue Jul 30 2024(Updated: )
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().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.98 | 6.1.98 |
| redhat/kernel | <6.6.39 | 6.6.39 |
| redhat/kernel | <6.9.9 | 6.9.9 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/4b3b6c7efee69f077b86ef7f088fb96768e46e1f
- https://git.kernel.org/stable/c/858ae09f03677a4ab907a15516893bc2cc79d4c3
- https://git.kernel.org/stable/c/e15a5d821e5192a3769d846079bc9aa380139baf
- https://git.kernel.org/stable/c/e3af5b14e7632bf12058533d69055393e2d126c9
- https://lore.kernel.org/linux-cve-announce/2024073021-CVE-2024-42110-4b28@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2301772
- https://access.redhat.com/errata/RHSA-2024:5928
- https://bugzilla.redhat.com/show_bug.cgi?id=2301473
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42110
- https://nvd.nist.gov/vuln/detail/CVE-2024-42110
- https://launchpad.net/bugs/cve/CVE-2024-42110
- https://security-tracker.debian.org/tracker/CVE-2024-42110
- https://ubuntu.com/security/CVE-2024-42110
- https://git.kernel.org/linus/e15a5d821e5192a3769d846079bc9aa380139baf
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