Matt Fleming f6697df36b x86/efi: Prevent mixed mode boot corruption with CONFIG_VMAP_STACK=y ... Booting an EFI mixed mode kernel has been crashing since commit: e37e43a497 ("x86/mm/64: Enable vmapped stacks (CONFIG_HAVE_ARCH_VMAP_STACK=y)") The user-visible effect in my test setup was the kernel being unable to find the root file system ramdisk. This was likely caused by silent memory or page table corruption. Enabling CONFIG_DEBUG_VIRTUAL=y immediately flagged the thunking code as abusing virt_to_phys() because it was passing addresses that were not part of the kernel direct mapping. Use the slow version instead, which correctly handles all memory regions by performing a page table walk. Suggested-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20161112210424.5157-3-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>		2016-11-13 08:26:40 +01:00
..
early_printk.c	treewide: replace obsolete _refok by __ref	2016-08-02 17:31:41 -04:00
efi_32.c
efi_64.c	x86/efi: Prevent mixed mode boot corruption with CONFIG_VMAP_STACK=y	2016-11-13 08:26:40 +01:00
efi_stub_32.S
efi_stub_64.S
efi_thunk_64.S
efi-bgrt.c	x86/efi-bgrt: Use efi_mem_reserve() to avoid copying image data	2016-09-09 16:08:38 +01:00
efi.c	x86/efi: Fix EFI memmap pointer size warning	2016-11-13 08:26:40 +01:00
Makefile
quirks.c	x86/efi: Round EFI memmap reservations to EFI_PAGE_SIZE	2016-09-20 15:43:31 +01:00