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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2023-53216

arm64: efi: Make efi_rt_lock a raw_spinlock

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: arm64: efi: Make efi_rt_lock a raw_spinlock Running a rt-kernel base on 6.2.0-rc3-rt1 on an Ampere Altra outputs the following: BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9, name: kworker/u320:0 preempt_count: 2, expected: 0 RCU nest depth: 0, expected: 0 3 locks held by kworker/u320:0/9: #0: ffff3fff8c27d128 ((wq_completion)efi_rts_wq){+.+.}-{0:0}, at: process_one_work (./include/linux/atomic/atomic-long.h:41) #1: ffff80000861bdd0 ((work_completion)(&efi_rts_work.work)){+.+.}-{0:0}, at: process_one_work (./include/linux/atomic/atomic-long.h:41) #2: ffffdf7e1ed3e460 (efi_rt_lock){+.+.}-{3:3}, at: efi_call_rts (drivers/firmware/efi/runtime-wrappers.c:101) Preemption disabled at: efi_virtmap_load (./arch/arm64/include/asm/mmu_context.h:248) CPU: 0 PID: 9 Comm: kworker/u320:0 Tainted: G W 6.2.0-rc3-rt1 Hardware name: WIWYNN Mt.Jade Server System B81.03001.0005/Mt.Jade Motherboard, BIOS 1.08.20220218 (SCP: 1.08.20220218) 2022/02/18 Workqueue: efi_rts_wq efi_call_rts Call trace: dump_backtrace (arch/arm64/kernel/stacktrace.c:158) show_stack (arch/arm64/kernel/stacktrace.c:165) dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4)) dump_stack (lib/dump_stack.c:114) __might_resched (kernel/sched/core.c:10134) rt_spin_lock (kernel/locking/rtmutex.c:1769 (discriminator 4)) efi_call_rts (drivers/firmware/efi/runtime-wrappers.c:101) [...] This seems to come from commit ff7a167961d1 ("arm64: efi: Execute runtime services from a dedicated stack") which adds a spinlock. This spinlock is taken through: efi_call_rts() \-efi_call_virt() \-efi_call_virt_pointer() \-arch_efi_call_virt_setup() Make 'efi_rt_lock' a raw_spinlock to avoid being preempted. [ardb: The EFI runtime services are called with a different set of translation tables, and are permitted to use the SIMD registers. The context switch code preserves/restores neither, and so EFI calls must be made with preemption disabled, rather than only disabling migration.]

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 4012603cbd469223f225637d265a233f034c567a to < 030b1c4217a4f504c7d0795a2bd86b7181e56f11affected
  • de2af657cab92afc13a4ccd8780370481ed0eb61 to < 6a72729ed6accc86dad5522895e8fa2f96642a2caffected
  • f75a91c82dc805af8f718ff106ec9c090234b37b to < 8b38969fa01662ec539a0d08a8ea5ec6f31fa4edaffected
  • ff7a167961d1b97e0e205f245f806e564d3505e7 to < 4e8f7d998b582a99aadedd07ae6086e99b89c97aaffected
  • ff7a167961d1b97e0e205f245f806e564d3505e7 to < 0e68b5517d3767562889f1d83fdb828c26adb24faffected
  • 5.10.165 to < 5.10.175affected
  • 5.15.90 to < 5.15.103affected
  • 6.1.8 to < 6.1.18affected

Linux Linux

Default version status: affected

  • 6.2affected
  • 0 to < 6.2unaffected
  • 5.10.175 to ≤ 5.10.*unaffected
  • 5.15.103 to ≤ 5.15.*unaffected
  • 6.1.18 to ≤ 6.1.*unaffected
  • 6.2.5 to ≤ 6.2.*unaffected
  • 6.3 to ≤ *unaffected

References