mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 03:15:23 +07:00
78cac48c04
Commit:e2b32e6785("x86, kaslr: randomize module base load address") made module base address randomization unconditional and didn't regard disabled KKASLR due to CONFIG_HIBERNATION and command line option "nokaslr". For more info see (now reverted) commit:f47233c2d3("x86/mm/ASLR: Propagate base load address calculation") In order to propagate KASLR status to kernel proper, we need a single bit in boot_params.hdr.loadflags and we've chosen bit 1 thus leaving the top-down allocated bits for bits supposed to be used by the bootloader. Originally-From: Jiri Kosina <jkosina@suse.cz> Suggested-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
#ifndef _ASM_X86_SETUP_H
|
|
#define _ASM_X86_SETUP_H
|
|
|
|
#include <uapi/asm/setup.h>
|
|
|
|
#define COMMAND_LINE_SIZE 2048
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
#ifdef __i386__
|
|
|
|
#include <linux/pfn.h>
|
|
/*
|
|
* Reserved space for vmalloc and iomap - defined in asm/page.h
|
|
*/
|
|
#define MAXMEM_PFN PFN_DOWN(MAXMEM)
|
|
#define MAX_NONPAE_PFN (1 << 20)
|
|
|
|
#endif /* __i386__ */
|
|
|
|
#define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
|
|
|
|
#define OLD_CL_MAGIC 0xA33F
|
|
#define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
|
|
#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm/bootparam.h>
|
|
#include <asm/x86_init.h>
|
|
|
|
extern u64 relocated_ramdisk;
|
|
|
|
/* Interrupt control for vSMPowered x86_64 systems */
|
|
#ifdef CONFIG_X86_64
|
|
void vsmp_init(void);
|
|
#else
|
|
static inline void vsmp_init(void) { }
|
|
#endif
|
|
|
|
void setup_bios_corruption_check(void);
|
|
|
|
extern unsigned long saved_video_mode;
|
|
|
|
extern void reserve_standard_io_resources(void);
|
|
extern void i386_reserve_resources(void);
|
|
extern void setup_default_timer_irq(void);
|
|
|
|
#ifdef CONFIG_X86_INTEL_MID
|
|
extern void x86_intel_mid_early_setup(void);
|
|
#else
|
|
static inline void x86_intel_mid_early_setup(void) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_INTEL_CE
|
|
extern void x86_ce4100_early_setup(void);
|
|
#else
|
|
static inline void x86_ce4100_early_setup(void) { }
|
|
#endif
|
|
|
|
#ifndef _SETUP
|
|
|
|
#include <asm/espfix.h>
|
|
|
|
/*
|
|
* This is set up by the setup-routine at boot-time
|
|
*/
|
|
extern struct boot_params boot_params;
|
|
|
|
static inline bool kaslr_enabled(void)
|
|
{
|
|
return !!(boot_params.hdr.loadflags & KASLR_FLAG);
|
|
}
|
|
|
|
/*
|
|
* Do NOT EVER look at the BIOS memory size location.
|
|
* It does not work on many machines.
|
|
*/
|
|
#define LOWMEMSIZE() (0x9f000)
|
|
|
|
/* exceedingly early brk-like allocator */
|
|
extern unsigned long _brk_end;
|
|
void *extend_brk(size_t size, size_t align);
|
|
|
|
/*
|
|
* Reserve space in the brk section. The name must be unique within
|
|
* the file, and somewhat descriptive. The size is in bytes. Must be
|
|
* used at file scope.
|
|
*
|
|
* (This uses a temp function to wrap the asm so we can pass it the
|
|
* size parameter; otherwise we wouldn't be able to. We can't use a
|
|
* "section" attribute on a normal variable because it always ends up
|
|
* being @progbits, which ends up allocating space in the vmlinux
|
|
* executable.)
|
|
*/
|
|
#define RESERVE_BRK(name,sz) \
|
|
static void __section(.discard.text) __used notrace \
|
|
__brk_reservation_fn_##name##__(void) { \
|
|
asm volatile ( \
|
|
".pushsection .brk_reservation,\"aw\",@nobits;" \
|
|
".brk." #name ":" \
|
|
" 1:.skip %c0;" \
|
|
" .size .brk." #name ", . - 1b;" \
|
|
" .popsection" \
|
|
: : "i" (sz)); \
|
|
}
|
|
|
|
/* Helper for reserving space for arrays of things */
|
|
#define RESERVE_BRK_ARRAY(type, name, entries) \
|
|
type *name; \
|
|
RESERVE_BRK(name, sizeof(type) * entries)
|
|
|
|
extern void probe_roms(void);
|
|
#ifdef __i386__
|
|
|
|
asmlinkage void __init i386_start_kernel(void);
|
|
|
|
#else
|
|
asmlinkage void __init x86_64_start_kernel(char *real_mode);
|
|
asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
|
|
|
|
#endif /* __i386__ */
|
|
#endif /* _SETUP */
|
|
#else
|
|
#define RESERVE_BRK(name,sz) \
|
|
.pushsection .brk_reservation,"aw",@nobits; \
|
|
.brk.name: \
|
|
1: .skip sz; \
|
|
.size .brk.name,.-1b; \
|
|
.popsection
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* _ASM_X86_SETUP_H */
|