CVE-2024-58237 — bpf: consider that tail calls invalidate packet pointers

Affected: Linux

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

bpf: consider that tail calls invalidate packet pointers

Tail-called programs could execute any of the helpers that invalidate packet pointers. Hence, conservatively assume that each tail call invalidates packet pointers.

Making the change in bpf_helper_changes_pkt_data() automatically makes use of check_cfg() logic that computes 'changes_pkt_data' effect for global sub-programs, such that the following program could be rejected:

int tail_call(struct __sk_buff *sk) { bpf_tail_call_static(sk, &jmp_table, 0); return 0; }

SEC("tc") int not_safe(struct __sk_buff *sk) { int *p = (void *)(long)sk->data; ... make p valid ... tail_call(sk); *p = 42; /* this is unsafe */ ... }

The tc_bpf2bpf.c:subprog_tc() needs change: mark it as a function that can invalidate packet pointers. Otherwise, it can't be freplaced with tailcall_freplace.c:entry_freplace() that does a tail call.

USN-7513-1 — linux, linux-aws, linux-aws-6.8, linux-ibm, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-oracle vulnerabilities

Affected: Ubuntu:22.04:LTS: linux-aws-6.8, Ubuntu:22.04:LTS: linux-lowlatency-hwe-6.8, Ubuntu:24.04:LTS: linux, Ubuntu:24.04:LTS: linux-aws, Ubuntu:24.04:LTS: linux-ibm, Ubuntu:24.04:LTS: linux-lowlatency, Ubuntu:24.04:LTS: linux-oracle

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - RISC-V architecture; - x86 architecture; - Block layer subsystem; - Compute Acceleration Framework; - ACPI drivers; - Drivers core; - Ublk userspace block driver; - Virtio block driver; - DMA engine subsystem; - GPU drivers; - Microsoft Hyper-V drivers; - Hardware monitoring drivers; - IIO ADC drivers; - IIO subsystem; - InfiniBand drivers; - Multiple devices driver; - Media drivers; - Microchip PCI driver; - Network drivers; - Mellanox network drivers; - STMicroelectronics network drivers; - PCI subsystem; - Pin controllers subsystem; - x86 platform drivers; - Power supply drivers; - SCSI subsystem; - USB Gadget drivers; - TDX Guest driver; - AFS file system; - BTRFS file system; - Ceph distributed file system; - EROFS file system; - File systems infrastructure; - Network file systems library; - NILFS2 file system; - Overlay file system; - SMB network file system; - VLANs driver; - Memory management; - LAPB network protocol; - io_uring subsystem; - BPF subsystem; - Control group (cgroup); - Tracing infrastructure; - Workqueue subsystem; - Bluetooth subsystem; - Networking core; - IPv4 networking; - IPv6 networking; - MAC80211 subsystem; - Multipath TCP; - Netfilter; - NET/ROM layer; - Pack…

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CVE-2024-58237 — bpf: consider that tail calls invalidate packet pointers

USN-7513-1 — linux, linux-aws, linux-aws-6.8, linux-ibm, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-oracle vulnerabilities