From 8b0d3b3b41ab6f14f1ce6d4a6b1c5f60b825123f Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Mon, 7 Sep 2020 15:15:16 +0200 Subject: x86/boot/compressed/64: Add page-fault handler Install a page-fault handler to add an identity mapping to addresses not yet mapped. Also do some checking whether the error code is sane. This makes non SEV-ES machines use the exception handling infrastructure in the pre-decompressions boot code too, making it less likely to break in the future. Signed-off-by: Joerg Roedel Signed-off-by: Borislav Petkov Reviewed-by: Kees Cook Link: https://lkml.kernel.org/r/20200907131613.12703-16-joro@8bytes.org --- arch/x86/boot/compressed/misc.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/x86/boot/compressed/misc.h') diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index 98b7a1df9c59..f0e199174c5f 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -37,6 +37,9 @@ #define memptr unsigned #endif +/* boot/compressed/vmlinux start and end markers */ +extern char _head[], _end[]; + /* misc.c */ extern memptr free_mem_ptr; extern memptr free_mem_end_ptr; @@ -146,4 +149,7 @@ extern pteval_t __default_kernel_pte_mask; extern gate_desc boot_idt[BOOT_IDT_ENTRIES]; extern struct desc_ptr boot_idt_desc; +/* IDT Entry Points */ +void boot_page_fault(void); + #endif /* BOOT_COMPRESSED_MISC_H */ -- cgit v1.2.3