Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
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>
|
|
|
|
#ifdef CONFIG_PPC64_ELF_ABI_V1
|
|
#define ARCH_FUNC_PREFIX "."
|
|
#endif
|
|
|
|
extern bool kfence_early_init;
|
|
extern bool kfence_disabled;
|
|
|
|
static inline void disable_kfence(void)
|
|
{
|
|
kfence_disabled = true;
|
|
}
|
|
|
|
static inline bool arch_kfence_init_pool(void)
|
|
{
|
|
return !kfence_disabled;
|
|
}
|
|
|
|
static inline bool kfence_early_init_enabled(void)
|
|
{
|
|
return IS_ENABLED(CONFIG_KFENCE) && kfence_early_init;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC64
|
|
static inline bool kfence_protect_page(unsigned long addr, bool protect)
|
|
{
|
|
struct page *page = virt_to_page((void *)addr);
|
|
|
|
__kernel_map_pages(page, 1, !protect);
|
|
|
|
return true;
|
|
}
|
|
#else
|
|
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
|
|
|
|
#endif /* __ASM_POWERPC_KFENCE_H */
|