| Message ID | 20220421082042.1167967-4-tongtiangen@huawei.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm: page_table_check: add support on arm64 and riscv | expand |
On 4/21/22 13:50, Tong Tiangen wrote: > Move ptep_clear() to the include/linux/pgtable.h and add page table check > relate hooks to some helpers, it's prepare for support page table check > feature on new architecture. Could instrumenting generic page table helpers (fallback instances when its corresponding __HAVE_ARCH_XXX is not defined on the platform), might add all the page table check hooks into paths on platforms which have not subscribed ARCH_SUPPORTS_PAGE_TABLE_CHECK in the first place ? Although these looks have !CONFIG_PAGE_TABLE_CHECK fallback stubs in the header, hence a build problem gets avoided. > > Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> > Acked-by: Pasha Tatashin <pasha.tatashin@soleen.com> > --- > arch/x86/include/asm/pgtable.h | 10 ---------- > include/linux/pgtable.h | 26 ++++++++++++++++++-------- > 2 files changed, 18 insertions(+), 18 deletions(-) > > diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h > index 564abe42b0f7..51cd39858f81 100644 > --- a/arch/x86/include/asm/pgtable.h > +++ b/arch/x86/include/asm/pgtable.h > @@ -1073,16 +1073,6 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, > return pte; > } > > -#define __HAVE_ARCH_PTEP_CLEAR AFICS X86 is the only platform subscribing __HAVE_ARCH_PTEP_CLEAR. Hence if this is getting dropped for generic ptep_clear(), then no need to add back #ifnded __HAVE_ARCH_PTEP_CLEAR construct. Generic ptep_clear() is the only definition for all platforms ? Also if this patch is trying to drop off __HAVE_ARCH_PTEP_CLEAR along with other page table check related changes, it needs to be done via a separate patch instead. > -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, > - pte_t *ptep) > -{ > - if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) > - ptep_get_and_clear(mm, addr, ptep); > - else > - pte_clear(mm, addr, ptep); > -} > - > #define __HAVE_ARCH_PTEP_SET_WRPROTECT > static inline void ptep_set_wrprotect(struct mm_struct *mm, > unsigned long addr, pte_t *ptep) > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h > index 49ab8ee2d6d7..10d2d91edf20 100644 > --- a/include/linux/pgtable.h > +++ b/include/linux/pgtable.h > @@ -12,6 +12,7 @@ > #include <linux/bug.h> > #include <linux/errno.h> > #include <asm-generic/pgtable_uffd.h> > +#include <linux/page_table_check.h> > > #if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ > defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS > @@ -272,14 +273,6 @@ static inline bool arch_has_hw_pte_young(void) > } > #endif > > -#ifndef __HAVE_ARCH_PTEP_CLEAR > -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, > - pte_t *ptep) > -{ > - pte_clear(mm, addr, ptep); > -} > -#endif > - > #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR > static inline pte_t ptep_get_and_clear(struct mm_struct *mm, > unsigned long address, > @@ -287,10 +280,22 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, > { > pte_t pte = *ptep; > pte_clear(mm, address, ptep); > + page_table_check_pte_clear(mm, address, pte); > return pte; > } > #endif > > +#ifndef __HAVE_ARCH_PTEP_CLEAR > +static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, > + pte_t *ptep) > +{ > + if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) > + ptep_get_and_clear(mm, addr, ptep); > + else > + pte_clear(mm, addr, ptep); Could not this be reworked to avoid IS_ENABLED() ? This is confusing. If the page table hooks can be added to all potential page table paths via generic helpers, irrespective of CONFIG_PAGE_TABLE_CHECK option, there is no rationale for doing a IS_ENABLED() check here. > +} > +#endif > + > #ifndef __HAVE_ARCH_PTEP_GET > static inline pte_t ptep_get(pte_t *ptep) > { > @@ -360,7 +365,10 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, > pmd_t *pmdp) > { > pmd_t pmd = *pmdp; > + > pmd_clear(pmdp); > + page_table_check_pmd_clear(mm, address, pmd); > + > return pmd; > } > #endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */ > @@ -372,6 +380,8 @@ static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, > pud_t pud = *pudp; > > pud_clear(pudp); > + page_table_check_pud_clear(mm, address, pud); > + > return pud; > } > #endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */
在 2022/4/22 14:05, Anshuman Khandual 写道: > > > On 4/21/22 13:50, Tong Tiangen wrote: >> Move ptep_clear() to the include/linux/pgtable.h and add page table check >> relate hooks to some helpers, it's prepare for support page table check >> feature on new architecture. > > Could instrumenting generic page table helpers (fallback instances when its > corresponding __HAVE_ARCH_XXX is not defined on the platform), might add all > the page table check hooks into paths on platforms which have not subscribed > ARCH_SUPPORTS_PAGE_TABLE_CHECK in the first place ? Although these looks have > !CONFIG_PAGE_TABLE_CHECK fallback stubs in the header, hence a build problem > gets avoided. Right, build problems are avoided by fallback stubs in the header file. > >> >> Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> >> Acked-by: Pasha Tatashin <pasha.tatashin@soleen.com> >> --- >> arch/x86/include/asm/pgtable.h | 10 ---------- >> include/linux/pgtable.h | 26 ++++++++++++++++++-------- >> 2 files changed, 18 insertions(+), 18 deletions(-) >> >> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h >> index 564abe42b0f7..51cd39858f81 100644 >> --- a/arch/x86/include/asm/pgtable.h >> +++ b/arch/x86/include/asm/pgtable.h >> @@ -1073,16 +1073,6 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, >> return pte; >> } >> >> -#define __HAVE_ARCH_PTEP_CLEAR > > AFICS X86 is the only platform subscribing __HAVE_ARCH_PTEP_CLEAR. Hence if > this is getting dropped for generic ptep_clear(), then no need to add back > #ifnded __HAVE_ARCH_PTEP_CLEAR construct. Generic ptep_clear() is the only > definition for all platforms ? > > Also if this patch is trying to drop off __HAVE_ARCH_PTEP_CLEAR along with > other page table check related changes, it needs to be done via a separate > patch instead. Agreed. IMO, this fix can be patched later. > >> -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >> - pte_t *ptep) >> -{ >> - if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) >> - ptep_get_and_clear(mm, addr, ptep); >> - else >> - pte_clear(mm, addr, ptep); >> -} >> - >> #define __HAVE_ARCH_PTEP_SET_WRPROTECT >> static inline void ptep_set_wrprotect(struct mm_struct *mm, >> unsigned long addr, pte_t *ptep) >> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h >> index 49ab8ee2d6d7..10d2d91edf20 100644 >> --- a/include/linux/pgtable.h >> +++ b/include/linux/pgtable.h >> @@ -12,6 +12,7 @@ >> #include <linux/bug.h> >> #include <linux/errno.h> >> #include <asm-generic/pgtable_uffd.h> >> +#include <linux/page_table_check.h> >> >> #if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ >> defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS >> @@ -272,14 +273,6 @@ static inline bool arch_has_hw_pte_young(void) >> } >> #endif >> >> -#ifndef __HAVE_ARCH_PTEP_CLEAR >> -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >> - pte_t *ptep) >> -{ >> - pte_clear(mm, addr, ptep); >> -} >> -#endif >> - >> #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR >> static inline pte_t ptep_get_and_clear(struct mm_struct *mm, >> unsigned long address, >> @@ -287,10 +280,22 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, >> { >> pte_t pte = *ptep; >> pte_clear(mm, address, ptep); >> + page_table_check_pte_clear(mm, address, pte); >> return pte; >> } >> #endif >> >> +#ifndef __HAVE_ARCH_PTEP_CLEAR >> +static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >> + pte_t *ptep) >> +{ >> + if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) >> + ptep_get_and_clear(mm, addr, ptep); >> + else >> + pte_clear(mm, addr, ptep); > > Could not this be reworked to avoid IS_ENABLED() ? This is confusing. If the page > table hooks can be added to all potential page table paths via generic helpers, > irrespective of CONFIG_PAGE_TABLE_CHECK option, there is no rationale for doing > a IS_ENABLED() check here. > From the perspective of code logic, we need to check the pte before being cleared. Whether pte check is required depends on IS_ENABLED(). Are there any suggestions for better implementation? Thank you, Tong. >> +} >> +#endif >> + >> #ifndef __HAVE_ARCH_PTEP_GET >> static inline pte_t ptep_get(pte_t *ptep) >> { >> @@ -360,7 +365,10 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, >> pmd_t *pmdp) >> { >> pmd_t pmd = *pmdp; >> + >> pmd_clear(pmdp); >> + page_table_check_pmd_clear(mm, address, pmd); >> + >> return pmd; >> } >> #endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */ >> @@ -372,6 +380,8 @@ static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, >> pud_t pud = *pudp; >> >> pud_clear(pudp); >> + page_table_check_pud_clear(mm, address, pud); >> + >> return pud; >> } >> #endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */ > .
On 4/24/22 09:40, Tong Tiangen wrote: > > > 在 2022/4/22 14:05, Anshuman Khandual 写道: >> >> >> On 4/21/22 13:50, Tong Tiangen wrote: >>> Move ptep_clear() to the include/linux/pgtable.h and add page table check >>> relate hooks to some helpers, it's prepare for support page table check >>> feature on new architecture. >> >> Could instrumenting generic page table helpers (fallback instances when its >> corresponding __HAVE_ARCH_XXX is not defined on the platform), might add all >> the page table check hooks into paths on platforms which have not subscribed >> ARCH_SUPPORTS_PAGE_TABLE_CHECK in the first place ? Although these looks have >> !CONFIG_PAGE_TABLE_CHECK fallback stubs in the header, hence a build problem >> gets avoided. > > Right, build problems are avoided by fallback stubs in the header file. Although there might not be a build problem as such, but should non subscribing platforms get their page table helpers instrumented with page table check hooks in the first place ? The commit message should address these questions. > >> >>> >>> Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> >>> Acked-by: Pasha Tatashin <pasha.tatashin@soleen.com> >>> --- >>> arch/x86/include/asm/pgtable.h | 10 ---------- >>> include/linux/pgtable.h | 26 ++++++++++++++++++-------- >>> 2 files changed, 18 insertions(+), 18 deletions(-) >>> >>> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h >>> index 564abe42b0f7..51cd39858f81 100644 >>> --- a/arch/x86/include/asm/pgtable.h >>> +++ b/arch/x86/include/asm/pgtable.h >>> @@ -1073,16 +1073,6 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, >>> return pte; >>> } >>> -#define __HAVE_ARCH_PTEP_CLEAR >> >> AFICS X86 is the only platform subscribing __HAVE_ARCH_PTEP_CLEAR. Hence if >> this is getting dropped for generic ptep_clear(), then no need to add back >> #ifnded __HAVE_ARCH_PTEP_CLEAR construct. Generic ptep_clear() is the only >> definition for all platforms ? >> >> Also if this patch is trying to drop off __HAVE_ARCH_PTEP_CLEAR along with >> other page table check related changes, it needs to be done via a separate >> patch instead. > > Agreed. > IMO, this fix can be patched later. > >> >>> -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >>> - pte_t *ptep) >>> -{ >>> - if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) >>> - ptep_get_and_clear(mm, addr, ptep); >>> - else >>> - pte_clear(mm, addr, ptep); >>> -} >>> - >>> #define __HAVE_ARCH_PTEP_SET_WRPROTECT >>> static inline void ptep_set_wrprotect(struct mm_struct *mm, >>> unsigned long addr, pte_t *ptep) >>> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h >>> index 49ab8ee2d6d7..10d2d91edf20 100644 >>> --- a/include/linux/pgtable.h >>> +++ b/include/linux/pgtable.h >>> @@ -12,6 +12,7 @@ >>> #include <linux/bug.h> >>> #include <linux/errno.h> >>> #include <asm-generic/pgtable_uffd.h> >>> +#include <linux/page_table_check.h> >>> #if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ >>> defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS >>> @@ -272,14 +273,6 @@ static inline bool arch_has_hw_pte_young(void) >>> } >>> #endif >>> -#ifndef __HAVE_ARCH_PTEP_CLEAR >>> -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >>> - pte_t *ptep) >>> -{ >>> - pte_clear(mm, addr, ptep); >>> -} >>> -#endif >>> - >>> #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR >>> static inline pte_t ptep_get_and_clear(struct mm_struct *mm, >>> unsigned long address, >>> @@ -287,10 +280,22 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, >>> { >>> pte_t pte = *ptep; >>> pte_clear(mm, address, ptep); >>> + page_table_check_pte_clear(mm, address, pte); >>> return pte; >>> } >>> #endif >>> +#ifndef __HAVE_ARCH_PTEP_CLEAR >>> +static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >>> + pte_t *ptep) >>> +{ >>> + if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) >>> + ptep_get_and_clear(mm, addr, ptep); >>> + else >>> + pte_clear(mm, addr, ptep); >> >> Could not this be reworked to avoid IS_ENABLED() ? This is confusing. If the page >> table hooks can be added to all potential page table paths via generic helpers, >> irrespective of CONFIG_PAGE_TABLE_CHECK option, there is no rationale for doing >> a IS_ENABLED() check here. >> > > From the perspective of code logic, we need to check the pte before being cleared. Whether pte check is required depends on IS_ENABLED(). > > Are there any suggestions for better implementation? But other generic page table helpers already have page table check hooks instrumented without IS_ENABLED() checks, then why this is any different. > > Thank you, > Tong. > >>> +} >>> +#endif >>> + >>> #ifndef __HAVE_ARCH_PTEP_GET >>> static inline pte_t ptep_get(pte_t *ptep) >>> { >>> @@ -360,7 +365,10 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, >>> pmd_t *pmdp) >>> { >>> pmd_t pmd = *pmdp; >>> + >>> pmd_clear(pmdp); >>> + page_table_check_pmd_clear(mm, address, pmd); >>> + >>> return pmd; >>> } >>> #endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */ >>> @@ -372,6 +380,8 @@ static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, >>> pud_t pud = *pudp; >>> pud_clear(pudp); >>> + page_table_check_pud_clear(mm, address, pud); >>> + >>> return pud; >>> } >>> #endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */ >> .
在 2022/4/25 13:52, Anshuman Khandual 写道: > > > On 4/24/22 09:40, Tong Tiangen wrote: >> >> >> 在 2022/4/22 14:05, Anshuman Khandual 写道: >>> >>> >>> On 4/21/22 13:50, Tong Tiangen wrote: >>>> Move ptep_clear() to the include/linux/pgtable.h and add page table check >>>> relate hooks to some helpers, it's prepare for support page table check >>>> feature on new architecture. >>> >>> Could instrumenting generic page table helpers (fallback instances when its >>> corresponding __HAVE_ARCH_XXX is not defined on the platform), might add all >>> the page table check hooks into paths on platforms which have not subscribed >>> ARCH_SUPPORTS_PAGE_TABLE_CHECK in the first place ? Although these looks have >>> !CONFIG_PAGE_TABLE_CHECK fallback stubs in the header, hence a build problem >>> gets avoided. >> >> Right, build problems are avoided by fallback stubs in the header file. > > Although there might not be a build problem as such, but should non subscribing > platforms get their page table helpers instrumented with page table check hooks > in the first place ? The commit message should address these questions. > Add description in commit message to explain that: Non subscription platforms will call a fallback ptc stubs when getting their page table helpers[1] in include/linux/pgtable.h. [1] ptep_clear/ptep_get_and_clear/pmdp_huge_get_and_clear/pudp_huge_get_and_clear Am i right? :) Thanks, Tong. >> >>> >>>> >>>> Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> >>>> Acked-by: Pasha Tatashin <pasha.tatashin@soleen.com> >>>> --- >>>> arch/x86/include/asm/pgtable.h | 10 ---------- >>>> include/linux/pgtable.h | 26 ++++++++++++++++++-------- >>>> 2 files changed, 18 insertions(+), 18 deletions(-) >>>> >>>> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h >>>> index 564abe42b0f7..51cd39858f81 100644 >>>> --- a/arch/x86/include/asm/pgtable.h >>>> +++ b/arch/x86/include/asm/pgtable.h >>>> @@ -1073,16 +1073,6 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, >>>> return pte; >>>> } >>>> -#define __HAVE_ARCH_PTEP_CLEAR >>> >>> AFICS X86 is the only platform subscribing __HAVE_ARCH_PTEP_CLEAR. Hence if >>> this is getting dropped for generic ptep_clear(), then no need to add back >>> #ifnded __HAVE_ARCH_PTEP_CLEAR construct. Generic ptep_clear() is the only >>> definition for all platforms ? >>> >>> Also if this patch is trying to drop off __HAVE_ARCH_PTEP_CLEAR along with >>> other page table check related changes, it needs to be done via a separate >>> patch instead. >> >> Agreed. >> IMO, this fix can be patched later. >> >>> >>>> -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >>>> - pte_t *ptep) >>>> -{ >>>> - if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) >>>> - ptep_get_and_clear(mm, addr, ptep); >>>> - else >>>> - pte_clear(mm, addr, ptep); >>>> -} >>>> - >>>> #define __HAVE_ARCH_PTEP_SET_WRPROTECT >>>> static inline void ptep_set_wrprotect(struct mm_struct *mm, >>>> unsigned long addr, pte_t *ptep) >>>> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h >>>> index 49ab8ee2d6d7..10d2d91edf20 100644 >>>> --- a/include/linux/pgtable.h >>>> +++ b/include/linux/pgtable.h >>>> @@ -12,6 +12,7 @@ >>>> #include <linux/bug.h> >>>> #include <linux/errno.h> >>>> #include <asm-generic/pgtable_uffd.h> >>>> +#include <linux/page_table_check.h> >>>> #if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ >>>> defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS >>>> @@ -272,14 +273,6 @@ static inline bool arch_has_hw_pte_young(void) >>>> } >>>> #endif >>>> -#ifndef __HAVE_ARCH_PTEP_CLEAR >>>> -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >>>> - pte_t *ptep) >>>> -{ >>>> - pte_clear(mm, addr, ptep); >>>> -} >>>> -#endif >>>> - >>>> #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR >>>> static inline pte_t ptep_get_and_clear(struct mm_struct *mm, >>>> unsigned long address, >>>> @@ -287,10 +280,22 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, >>>> { >>>> pte_t pte = *ptep; >>>> pte_clear(mm, address, ptep); >>>> + page_table_check_pte_clear(mm, address, pte); >>>> return pte; >>>> } >>>> #endif >>>> +#ifndef __HAVE_ARCH_PTEP_CLEAR >>>> +static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, >>>> + pte_t *ptep) >>>> +{ >>>> + if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) >>>> + ptep_get_and_clear(mm, addr, ptep); >>>> + else >>>> + pte_clear(mm, addr, ptep); >>> >>> Could not this be reworked to avoid IS_ENABLED() ? This is confusing. If the page >>> table hooks can be added to all potential page table paths via generic helpers, >>> irrespective of CONFIG_PAGE_TABLE_CHECK option, there is no rationale for doing >>> a IS_ENABLED() check here. >>> >> >> From the perspective of code logic, we need to check the pte before being cleared. Whether pte check is required depends on IS_ENABLED(). >> >> Are there any suggestions for better implementation? > > But other generic page table helpers already have page table check hooks > instrumented without IS_ENABLED() checks, then why this is any different. > Maybe i understand what you said, the more reasonable implement is: static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long address, pte_t *ptep) { pte_t pte = *ptep; pte_clear(mm, address, ptep); page_table_check_pte_clear(mm, address, pte); return pte; } static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { ptep_get_and_clear(mm, address, ptep); } >> >> Thank you, >> Tong. >> >>>> +} >>>> +#endif >>>> + >>>> #ifndef __HAVE_ARCH_PTEP_GET >>>> static inline pte_t ptep_get(pte_t *ptep) >>>> { >>>> @@ -360,7 +365,10 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, >>>> pmd_t *pmdp) >>>> { >>>> pmd_t pmd = *pmdp; >>>> + >>>> pmd_clear(pmdp); >>>> + page_table_check_pmd_clear(mm, address, pmd); >>>> + >>>> return pmd; >>>> } >>>> #endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */ >>>> @@ -372,6 +380,8 @@ static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, >>>> pud_t pud = *pudp; >>>> pud_clear(pudp); >>>> + page_table_check_pud_clear(mm, address, pud); >>>> + >>>> return pud; >>>> } >>>> #endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */ >>> . > .
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 564abe42b0f7..51cd39858f81 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1073,16 +1073,6 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, return pte; } -#define __HAVE_ARCH_PTEP_CLEAR -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, - pte_t *ptep) -{ - if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) - ptep_get_and_clear(mm, addr, ptep); - else - pte_clear(mm, addr, ptep); -} - #define __HAVE_ARCH_PTEP_SET_WRPROTECT static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 49ab8ee2d6d7..10d2d91edf20 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -12,6 +12,7 @@ #include <linux/bug.h> #include <linux/errno.h> #include <asm-generic/pgtable_uffd.h> +#include <linux/page_table_check.h> #if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS @@ -272,14 +273,6 @@ static inline bool arch_has_hw_pte_young(void) } #endif -#ifndef __HAVE_ARCH_PTEP_CLEAR -static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, - pte_t *ptep) -{ - pte_clear(mm, addr, ptep); -} -#endif - #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long address, @@ -287,10 +280,22 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, { pte_t pte = *ptep; pte_clear(mm, address, ptep); + page_table_check_pte_clear(mm, address, pte); return pte; } #endif +#ifndef __HAVE_ARCH_PTEP_CLEAR +static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, + pte_t *ptep) +{ + if (IS_ENABLED(CONFIG_PAGE_TABLE_CHECK)) + ptep_get_and_clear(mm, addr, ptep); + else + pte_clear(mm, addr, ptep); +} +#endif + #ifndef __HAVE_ARCH_PTEP_GET static inline pte_t ptep_get(pte_t *ptep) { @@ -360,7 +365,10 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, pmd_t *pmdp) { pmd_t pmd = *pmdp; + pmd_clear(pmdp); + page_table_check_pmd_clear(mm, address, pmd); + return pmd; } #endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */ @@ -372,6 +380,8 @@ static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, pud_t pud = *pudp; pud_clear(pudp); + page_table_check_pud_clear(mm, address, pud); + return pud; } #endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */