Arvind Sankar 41d90b0c11 efi/x86: Setup stack correctly for efi_pe_entry ... Commit 17054f492d ("efi/x86: Implement mixed mode boot without the handover protocol") introduced a new entry point for the EFI stub to be booted in mixed mode on 32-bit firmware. When entered via efi32_pe_entry, control is first transferred to startup_32 to setup for the switch to long mode, and then the EFI stub proper is entered via efi_pe_entry. efi_pe_entry is an MS ABI function, and the ABI requires 32 bytes of shadow stack space to be allocated by the caller, as well as the stack being aligned to 8 mod 16 on entry. Allocate 40 bytes on the stack before switching to 64-bit mode when calling efi_pe_entry to account for this. For robustness, explicitly align boot_stack_end to 16 bytes. It is currently implicitly aligned since .bss is cacheline-size aligned, head_64.o is the first object file with a .bss section, and the heap and boot sizes are aligned. Fixes: 17054f492d ("efi/x86: Implement mixed mode boot without the handover protocol") Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Link: https://lore.kernel.org/r/20200617131957.2507632-1-nivedita@alum.mit.edu Signed-off-by: Ard Biesheuvel <ardb@kernel.org>		2020-06-17 15:28:58 +02:00
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.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
acpi.c	x86/boot: Fix -Wint-to-pointer-cast build warning	2020-05-04 15:22:16 +02:00
cmdline.c
cpuflags.c
early_serial_console.c
efi_thunk_64.S	efi/x86: Drop the special GDT for the EFI thunk	2020-05-24 00:25:15 +02:00
error.c
error.h
head_32.S	x86/boot: Correct relocation destination on old linkers	2020-05-19 14:11:22 +02:00
head_64.S	efi/x86: Setup stack correctly for efi_pe_entry	2020-06-17 15:28:58 +02:00
kaslr.c
kaslr_64.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
kernel_info.S
Makefile	Linux 5.7-rc1	2020-04-13 09:44:39 +02:00
mem_encrypt.S
misc.c
misc.h	x86/boot/compressed: Fix debug_puthex() parameter type	2020-03-28 12:14:26 +01:00
mkpiggy.c
pgtable.h
pgtable_64.c
string.c
vmlinux.lds.S	Misc dependency fixes, plus a documentation update about memory protection keys support.	2020-06-01 13:45:59 -07:00