CVE-2024-36936 — efi/unaccepted: touch soft lockup during memory accept

Affected: Linux

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

efi/unaccepted: touch soft lockup during memory accept

Commit 50e782a86c98 ("efi/unaccepted: Fix soft lockups caused by parallel memory acceptance") has released the spinlock so other CPUs can do memory acceptance in parallel and not triggers softlockup on other CPUs.

However the softlock up was intermittent shown up if the memory of the TD guest is large, and the timeout of softlockup is set to 1 second:

RIP: 0010:_raw_spin_unlock_irqrestore Call Trace: ? __hrtimer_run_queues <IRQ> ? hrtimer_interrupt ? watchdog_timer_fn ? __sysvec_apic_timer_interrupt ? __pfx_watchdog_timer_fn ? sysvec_apic_timer_interrupt </IRQ> ? __hrtimer_run_queues <TASK> ? hrtimer_interrupt ? asm_sysvec_apic_timer_interrupt ? _raw_spin_unlock_irqrestore ? __sysvec_apic_timer_interrupt ? sysvec_apic_timer_interrupt accept_memory try_to_accept_memory do_huge_pmd_anonymous_page get_page_from_freelist __handle_mm_fault __alloc_pages __folio_alloc ? __tdx_hypercall handle_mm_fault vma_alloc_folio do_user_addr_fault do_huge_pmd_anonymous_page exc_page_fault ? __do_huge_pmd_anonymous_page asm_exc_page_fault __handle_mm_fault

When the local irq is enabled at the end of accept_memory(), the softlockup detects that the watchdog on single CPU has not been fed for a while. That is to say, even other CPUs will not be blocked by spinlock, the current CPU might be stunk with local irq disabled for a while, which…

USN-6949-1 — linux, linux-aws, linux-gcp, linux-gke, linux-ibm, linux-nvidia, linux-nvidia-6.8 vulnerabilities

Affected: Ubuntu:22.04:LTS: linux-nvidia-6.8, Ubuntu:24.04:LTS: linux, Ubuntu:24.04:LTS: linux-aws, Ubuntu:24.04:LTS: linux-gcp, Ubuntu:24.04:LTS: linux-gke, Ubuntu:24.04:LTS: linux-ibm, Ubuntu:24.04:LTS: linux-nvidia

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: - ARM32 architecture; - ARM64 architecture; - M68K architecture; - OpenRISC architecture; - PowerPC architecture; - RISC-V architecture; - x86 architecture; - Block layer subsystem; - Accessibility subsystem; - Bluetooth drivers; - Clock framework and drivers; - CPU frequency scaling framework; - Hardware crypto device drivers; - DMA engine subsystem; - DPLL subsystem; - FireWire subsystem; - EFI core; - Qualcomm firmware drivers; - GPIO subsystem; - GPU drivers; - Microsoft Hyper-V drivers; - InfiniBand drivers; - IOMMU subsystem; - IRQ chip drivers; - Macintosh device drivers; - Multiple devices driver; - Media drivers; - EEPROM drivers; - MMC subsystem; - Network drivers; - STMicroelectronics network drivers; - Device tree and open firmware driver; - HiSilicon SoC PMU drivers; - PHY drivers; - Pin controllers subsystem; - Remote Processor subsystem; - S/390 drivers; - SCSI drivers; - SPI subsystem; - Media staging drivers; - Thermal drivers; - Userspace I/O drivers; - USB subsystem; - DesignWare USB3 driver; - ACRN Hypervisor Service Module driver; - Virtio drivers; - 9P distributed file system; - BTRFS file system; - eCrypt file system; - EROFS file system; - File systems infrastructure; - GF…

Most recent entries from all

CVE-2024-36936 — efi/unaccepted: touch soft lockup during memory accept

USN-6949-1 — linux, linux-aws, linux-gcp, linux-gke, linux-ibm, linux-nvidia, linux-nvidia-6.8 vulnerabilities