https://github.com/torvalds/linux
Revision cf40361ede6cf9dc09349e4c049dc0d166ca2d8b authored by Guenter Roeck on 11 September 2018, 18:18:12 UTC, committed by Thomas Gleixner on 12 September 2018, 19:53:34 UTC
Commit eeb89e2bb1ac ("x86/efi: Load fixmap GDT in efi_call_phys_epilog()") moved loading the fixmap in efi_call_phys_epilog() after load_cr3() since it was assumed to be more logical. Turns out this is incorrect: In efi_call_phys_prolog(), the gdt with its physical address is loaded first, and when the %cr3 is reloaded in _epilog from initial_page_table to swapper_pg_dir again the gdt is no longer mapped. This results in a triple fault if an interrupt occurs after load_cr3() and before load_fixmap_gdt(0). Calling load_fixmap_gdt(0) first restores the execution order prior to commit eeb89e2bb1ac and fixes the problem. Fixes: eeb89e2bb1ac ("x86/efi: Load fixmap GDT in efi_call_phys_epilog()") Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: linux-efi@vger.kernel.org Cc: Andy Lutomirski <luto@amacapital.net> Cc: Joerg Roedel <jroedel@suse.de> Link: https://lkml.kernel.org/r/1536689892-21538-1-git-send-email-linux@roeck-us.net
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Tip revision: cf40361ede6cf9dc09349e4c049dc0d166ca2d8b authored by Guenter Roeck on 11 September 2018, 18:18:12 UTC
x86/efi: Load fixmap GDT in efi_call_phys_epilog() before setting %cr3
x86/efi: Load fixmap GDT in efi_call_phys_epilog() before setting %cr3
Tip revision: cf40361
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