In the Linux kernel, the following vulnerability has been resolved:
virtio_net: Fix napi_skb_cache_put warning
After the commit bdacf3e34945 ("net: Use nested-BH locking for
napi_alloc_cache.") was merged, the following warning began to appear:
WARNING: CPU: 5 PID: 1 at net/core/skbuff.c:1451 napi_skb_cache_put+0x82/0x4b0
__warn+0x12f/0x340
napi_skb_cache_put+0x82/0x4b0
napi_skb_cache_put+0x82/0x4b0
report_bug+0x165/0x370
handle_bug+0x3d/0x80
exc_invalid_op+0x1a/0x50
asm_exc_invalid_op+0x1a/0x20
__free_old_xmit+0x1c8/0x510
napi_skb_cache_put+0x82/0x4b0
__free_old_xmit+0x1c8/0x510
__free_old_xmit+0x1c8/0x510
__pfx___free_old_xmit+0x10/0x10
The issue arises because virtio is assuming it's running in NAPI context
even when it's not, such as in the netpoll case.
To resolve this, modify virtnet_poll_tx() to only set NAPI when budget
is available. Same for virtnet_poll_cleantx(), which always assumed that
it was in a NAPI context.
Metrics
Affected Vendors & Products
References
History
Tue, 17 Sep 2024 10:30:00 +0000
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Weaknesses | CWE-667 |
Thu, 12 Sep 2024 12:00:00 +0000
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Wed, 11 Sep 2024 13:30:00 +0000
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ssvc
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Sun, 08 Sep 2024 07:30:00 +0000
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Mon, 19 Aug 2024 19:15:00 +0000
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threat_severity
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cvssV3_1
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Sat, 17 Aug 2024 09:30:00 +0000
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Description | In the Linux kernel, the following vulnerability has been resolved: virtio_net: Fix napi_skb_cache_put warning After the commit bdacf3e34945 ("net: Use nested-BH locking for napi_alloc_cache.") was merged, the following warning began to appear: WARNING: CPU: 5 PID: 1 at net/core/skbuff.c:1451 napi_skb_cache_put+0x82/0x4b0 __warn+0x12f/0x340 napi_skb_cache_put+0x82/0x4b0 napi_skb_cache_put+0x82/0x4b0 report_bug+0x165/0x370 handle_bug+0x3d/0x80 exc_invalid_op+0x1a/0x50 asm_exc_invalid_op+0x1a/0x20 __free_old_xmit+0x1c8/0x510 napi_skb_cache_put+0x82/0x4b0 __free_old_xmit+0x1c8/0x510 __free_old_xmit+0x1c8/0x510 __pfx___free_old_xmit+0x10/0x10 The issue arises because virtio is assuming it's running in NAPI context even when it's not, such as in the netpoll case. To resolve this, modify virtnet_poll_tx() to only set NAPI when budget is available. Same for virtnet_poll_cleantx(), which always assumed that it was in a NAPI context. | |
Title | virtio_net: Fix napi_skb_cache_put warning | |
References |
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MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-08-17T09:21:52.425Z
Updated: 2024-09-15T17:53:58.685Z
Reserved: 2024-08-17T09:11:59.274Z
Link: CVE-2024-43835
Vulnrichment
Updated: 2024-09-11T12:42:23.121Z
NVD
Status : Awaiting Analysis
Published: 2024-08-17T10:15:09.183
Modified: 2024-09-12T12:15:48.653
Link: CVE-2024-43835
Redhat