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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-49357

efi: Do not import certificates from UEFI Secure Boot for T2 Macs

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: efi: Do not import certificates from UEFI Secure Boot for T2 Macs On Apple T2 Macs, when Linux attempts to read the db and dbx efi variables at early boot to load UEFI Secure Boot certificates, a page fault occurs in Apple firmware code and EFI runtime services are disabled with the following logs: [Firmware Bug]: Page fault caused by firmware at PA: 0xffffb1edc0068000 WARNING: CPU: 3 PID: 104 at arch/x86/platform/efi/quirks.c:735 efi_crash_gracefully_on_page_fault+0x50/0xf0 (Removed some logs from here) Call Trace: <TASK> page_fault_oops+0x4f/0x2c0 ? search_bpf_extables+0x6b/0x80 ? search_module_extables+0x50/0x80 ? search_exception_tables+0x5b/0x60 kernelmode_fixup_or_oops+0x9e/0x110 __bad_area_nosemaphore+0x155/0x190 bad_area_nosemaphore+0x16/0x20 do_kern_addr_fault+0x8c/0xa0 exc_page_fault+0xd8/0x180 asm_exc_page_fault+0x1e/0x30 (Removed some logs from here) ? __efi_call+0x28/0x30 ? switch_mm+0x20/0x30 ? efi_call_rts+0x19a/0x8e0 ? process_one_work+0x222/0x3f0 ? worker_thread+0x4a/0x3d0 ? kthread+0x17a/0x1a0 ? process_one_work+0x3f0/0x3f0 ? set_kthread_struct+0x40/0x40 ? ret_from_fork+0x22/0x30 </TASK> ---[ end trace 1f82023595a5927f ]--- efi: Froze efi_rts_wq and disabled EFI Runtime Services integrity: Couldn't get size: 0x8000000000000015 integrity: MODSIGN: Couldn't get UEFI db list efi: EFI Runtime Services are disabled! integrity: Couldn't get size: 0x8000000000000015 integrity: Couldn't get UEFI dbx list integrity: Couldn't get size: 0x8000000000000015 integrity: Couldn't get mokx list integrity: Couldn't get size: 0x80000000 So we avoid reading these UEFI variables and thus prevent the crash.

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

  • 15ea0e1e3e185040bed6119f815096f2e4326242 to < b1cda6dd2c44771f042d65f0d17bec322ef99a0aaffected
  • 15ea0e1e3e185040bed6119f815096f2e4326242 to < c072cab98bac11f6ef9db640fb51834d9552e2e6affected
  • 15ea0e1e3e185040bed6119f815096f2e4326242 to < 65237307f88f5200782ae7f243bdd385e37cde5daffected
  • 15ea0e1e3e185040bed6119f815096f2e4326242 to < b34786b25d75f9c119696e6bdf3827f54ae3601baffected
  • 15ea0e1e3e185040bed6119f815096f2e4326242 to < 1f7264f0510f519b4e4f575a8f0579ea65e7592eaffected
  • 15ea0e1e3e185040bed6119f815096f2e4326242 to < 155ca952c7ca19aa32ecfb7373a32bbc2e1ec6ebaffected

Linux Linux

Default version status: affected

  • 5.0affected
  • 0 to < 5.0unaffected
  • 5.4.198 to ≤ 5.4.*unaffected
  • 5.10.121 to ≤ 5.10.*unaffected
  • 5.15.46 to ≤ 5.15.*unaffected
  • 5.17.14 to ≤ 5.17.*unaffected
  • 5.18.3 to ≤ 5.18.*unaffected
  • 5.19 to ≤ *unaffected

References