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First batch of EFI fixes for v6.2:

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- avoid a potential crash on the efi_subsys_init() error path
 - use more appropriate error code for runtime services calls issued
   after a crash in the firmware occurred
 - avoid READ_ONCE() for accessing firmware tables that may appear
   misaligned in memory
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Merge tag 'efi-fixes-for-v6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI fixes from Ard Biesheuvel:

 - avoid a potential crash on the efi_subsys_init() error path

 - use more appropriate error code for runtime services calls issued
   after a crash in the firmware occurred

 - avoid READ_ONCE() for accessing firmware tables that may appear
   misaligned in memory

* tag 'efi-fixes-for-v6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
  efi: tpm: Avoid READ_ONCE() for accessing the event log
  efi: rt-wrapper: Add missing include
  efi: fix userspace infinite retry read efivars after EFI runtime services page fault
  efi: fix NULL-deref in init error path
This commit is contained in:
Linus Torvalds 2023-01-13 10:37:10 -06:00
commit 0bf913e07b
4 changed files with 10 additions and 5 deletions
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4
include/linux/tpm_eventlog.h
View file

@ -198,8 +198,8 @@ static __always_inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *ev
* The loop below will unmap these fields if the log is larger than
* one page, so save them here for reference:
*/
count = READ_ONCE(event->count);
event_type = READ_ONCE(event->event_type);
count = event->count;
event_type = event->event_type;
/* Verify that it's the log header */
if (event_header->pcr_idx != 0 ||