GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-07 06:52:07 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

x86/{fault,efi}: Fix and rename efi_recover_from_page_fault()

Browse source 
efi_recover_from_page_fault() doesn't recover -- it does a special EFI
mini-oops.  Rename it to make it clear that it crashes.

While renaming it, I noticed a blatant bug: a page fault oops in a
different thread happening concurrently with an EFI runtime service call
would be misinterpreted as an EFI page fault.  Fix that.

This isn't quite exact. The situation could be improved by using a
special CS for calls into EFI.

 [ bp: Massage commit message and simplify in interrupt check. ]

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/f43b1e80830dc78ed60ed8b0826f4f189254570c.1612924255.git.luto@kernel.org
This commit is contained in:
Andy Lutomirski 2021-02-09 18:33:46 -08:00 • committed by Borislav Petkov
parent ca24728378
commit c46f52231e
3 changed files with 20 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/include/asm/efi.h
View file

@ -150,7 +150,7 @@ extern void __init efi_apply_memmap_quirks(void);
extern int __init efi_reuse_config(u64 tables, int nr_tables);
extern void efi_delete_dummy_variable(void);
extern void efi_switch_mm(struct mm_struct *mm);
extern void efi_recover_from_page_fault(unsigned long phys_addr);
extern void efi_crash_gracefully_on_page_fault(unsigned long phys_addr);
extern void efi_free_boot_services(void);
/* kexec external ABI */