13f7806690
Allow CFI enabled entry code to make indirect calls by also mapping CFI jump tables, and add a check to ensure the jump table section is not empty. Bug: 145210207 Change-Id: I4ad3506f7a365cd068009348d45b54e228e42e33 Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
39 lines
941 B
C
39 lines
941 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_SECTIONS_H
|
|
#define _ASM_X86_SECTIONS_H
|
|
|
|
#define arch_is_kernel_initmem_freed arch_is_kernel_initmem_freed
|
|
|
|
#include <asm-generic/sections.h>
|
|
#include <asm/extable.h>
|
|
|
|
extern char __brk_base[], __brk_limit[];
|
|
extern char __cfi_jt_start[], __cfi_jt_end[];
|
|
extern char __end_rodata_aligned[];
|
|
|
|
#if defined(CONFIG_X86_64)
|
|
extern char __end_rodata_hpage_align[];
|
|
#endif
|
|
|
|
extern char __end_of_kernel_reserve[];
|
|
|
|
extern unsigned long _brk_start, _brk_end;
|
|
|
|
static inline bool arch_is_kernel_initmem_freed(unsigned long addr)
|
|
{
|
|
/*
|
|
* If _brk_start has not been cleared, brk allocation is incomplete,
|
|
* and we can not make assumptions about its use.
|
|
*/
|
|
if (_brk_start)
|
|
return 0;
|
|
|
|
/*
|
|
* After brk allocation is complete, space between _brk_end and _end
|
|
* is available for allocation.
|
|
*/
|
|
return addr >= _brk_end && addr < (unsigned long)&_end;
|
|
}
|
|
|
|
#endif /* _ASM_X86_SECTIONS_H */
|