Ubuntu: (Multiple Advisories) (CVE-2024-35860): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: support deferring bpf_link dealloc to after RCU grace period BPF link for some program types is passed as a "context" which can be used by those BPF programs to look up additional information. E.g., for multi-kprobes and multi-uprobes, link is used to fetch BPF cookie values. Because of this runtime dependency, when bpf_link refcnt drops to zero there could still be active BPF programs running accessing link data. This patch adds generic support to defer bpf_link dealloc callback to after RCU GP, if requested. This is done by exposing two different deallocation callbacks, one synchronous and one deferred. If deferred one is provided, bpf_link_free() will schedule dealloc_deferred() callback to happen after RCU GP. BPF is using two flavors of RCU: "classic" non-sleepable one and RCU tasks trace one. The latter is used when sleepable BPF programs are used. bpf_link_free() accommodates that by checking underlying BPF program's sleepable flag, and goes either through normal RCU GP only for non-sleepable, or through RCU tasks trace GP *and* then normal RCU GP (taking into account rcu_trace_implies_rcu_gp() optimization), if BPF program is sleepable. We use this for multi-kprobe and multi-uprobe links, which dereference link during program run. We also preventively switch raw_tp link to use deferred dealloc callback, as upcoming changes in bpf-next tree expose raw_tp link data (specifically, cookie value) to BPF program at runtime as well.
Solution(s)
- ubuntu-upgrade-linux-image-6-8-0-1006-gke
- ubuntu-upgrade-linux-image-6-8-0-1007-intel
- ubuntu-upgrade-linux-image-6-8-0-1007-raspi
- ubuntu-upgrade-linux-image-6-8-0-1008-ibm
- ubuntu-upgrade-linux-image-6-8-0-1008-oem
- ubuntu-upgrade-linux-image-6-8-0-1008-oracle
- ubuntu-upgrade-linux-image-6-8-0-1008-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1009-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1009-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1010-azure
- ubuntu-upgrade-linux-image-6-8-0-1010-azure-fde
- ubuntu-upgrade-linux-image-6-8-0-1010-gcp
- ubuntu-upgrade-linux-image-6-8-0-1011-aws
- ubuntu-upgrade-linux-image-6-8-0-38-generic
- ubuntu-upgrade-linux-image-6-8-0-38-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-38-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-38-lowlatency-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-azure
- ubuntu-upgrade-linux-image-azure-fde
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- ubuntu-upgrade-linux-image-generic-hwe-24-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-ibm
- ubuntu-upgrade-linux-image-ibm-classic
- ubuntu-upgrade-linux-image-ibm-lts-24-04
- ubuntu-upgrade-linux-image-intel
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-64k
- ubuntu-upgrade-linux-image-oem-24-04
- ubuntu-upgrade-linux-image-oem-24-04a
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-64k
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
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