mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-26 07:44:27 +08:00
90cbac0e99
Add architecture specific implementation details for KFENCE and enable KFENCE for the ppc32 architecture. In particular, this implements the required interface in <asm/kfence.h>. KFENCE requires that attributes for pages from its memory pool can individually be set. Therefore, force the Read/Write linear map to be mapped at page granularity. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Acked-by: Marco Elver <elver@google.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/8dfe1bd2abde26337c1d8c1ad0acfcc82185e0d5.1614868445.git.christophe.leroy@csgroup.eu
34 lines
650 B
C
34 lines
650 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* powerpc KFENCE support.
|
|
*
|
|
* Copyright (C) 2020 CS GROUP France
|
|
*/
|
|
|
|
#ifndef __ASM_POWERPC_KFENCE_H
|
|
#define __ASM_POWERPC_KFENCE_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
static inline bool arch_kfence_init_pool(void)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool kfence_protect_page(unsigned long addr, bool protect)
|
|
{
|
|
pte_t *kpte = virt_to_kpte(addr);
|
|
|
|
if (protect) {
|
|
pte_update(&init_mm, addr, kpte, _PAGE_PRESENT, 0, 0);
|
|
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
|
|
} else {
|
|
pte_update(&init_mm, addr, kpte, 0, _PAGE_PRESENT, 0);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#endif /* __ASM_POWERPC_KFENCE_H */
|