| Message ID | 20190812092236.16648-8-santosh@fossix.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | powerpc: implement machine check safe memcpy | expand |
| Context | Check | Description |
|---|---|---|
| snowpatch_ozlabs/apply_patch | warning | Failed to apply on branch next (da206bd46848568e1aaf35f00e2d78bf9bc94f95) |
| snowpatch_ozlabs/apply_patch | fail | Failed to apply to any branch |
On 12/8/19 7:22 pm, Santosh Sivaraj wrote: > Use memcpy_mcsafe() implementation to define copy_to_user_mcsafe() > > Signed-off-by: Santosh Sivaraj <santosh@fossix.org> > --- > arch/powerpc/Kconfig | 1 + > arch/powerpc/include/asm/uaccess.h | 14 ++++++++++++++ > 2 files changed, 15 insertions(+) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 77f6ebf97113..4316e36095a2 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -137,6 +137,7 @@ config PPC > select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) > select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST > select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64 > + select ARCH_HAS_UACCESS_MCSAFE if PPC64 > select ARCH_HAS_UBSAN_SANITIZE_ALL > select ARCH_HAVE_NMI_SAFE_CMPXCHG > select ARCH_KEEP_MEMBLOCK > diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h > index 8b03eb44e876..15002b51ff18 100644 > --- a/arch/powerpc/include/asm/uaccess.h > +++ b/arch/powerpc/include/asm/uaccess.h > @@ -387,6 +387,20 @@ static inline unsigned long raw_copy_to_user(void __user *to, > return ret; > } > > +static __always_inline unsigned long __must_check > +copy_to_user_mcsafe(void __user *to, const void *from, unsigned long n) > +{ > + if (likely(check_copy_size(from, n, true))) { > + if (access_ok(to, n)) { > + allow_write_to_user(to, n); > + n = memcpy_mcsafe((void *)to, from, n); > + prevent_write_to_user(to, n); > + } > + } > + > + return n; Do we always return n independent of the check_copy_size return value and access_ok return values? Balbir Singh. > +} > + > extern unsigned long __clear_user(void __user *addr, unsigned long size); > > static inline unsigned long clear_user(void __user *addr, unsigned long size) >
Hi Balbir, Balbir Singh <bsingharora@gmail.com> writes: > On 12/8/19 7:22 pm, Santosh Sivaraj wrote: >> Use memcpy_mcsafe() implementation to define copy_to_user_mcsafe() >> >> Signed-off-by: Santosh Sivaraj <santosh@fossix.org> >> --- >> arch/powerpc/Kconfig | 1 + >> arch/powerpc/include/asm/uaccess.h | 14 ++++++++++++++ >> 2 files changed, 15 insertions(+) >> >> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >> index 77f6ebf97113..4316e36095a2 100644 >> --- a/arch/powerpc/Kconfig >> +++ b/arch/powerpc/Kconfig >> @@ -137,6 +137,7 @@ config PPC >> select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) >> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST >> select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64 >> + select ARCH_HAS_UACCESS_MCSAFE if PPC64 >> select ARCH_HAS_UBSAN_SANITIZE_ALL >> select ARCH_HAVE_NMI_SAFE_CMPXCHG >> select ARCH_KEEP_MEMBLOCK >> diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h >> index 8b03eb44e876..15002b51ff18 100644 >> --- a/arch/powerpc/include/asm/uaccess.h >> +++ b/arch/powerpc/include/asm/uaccess.h >> @@ -387,6 +387,20 @@ static inline unsigned long raw_copy_to_user(void __user *to, >> return ret; >> } >> >> +static __always_inline unsigned long __must_check >> +copy_to_user_mcsafe(void __user *to, const void *from, unsigned long n) >> +{ >> + if (likely(check_copy_size(from, n, true))) { >> + if (access_ok(to, n)) { >> + allow_write_to_user(to, n); >> + n = memcpy_mcsafe((void *)to, from, n); >> + prevent_write_to_user(to, n); >> + } >> + } >> + >> + return n; > > Do we always return n independent of the check_copy_size return value and > access_ok return values? Yes we always return the remaining bytes not copied even if check_copy_size or access_ok fails. Santosh > > Balbir Singh. > >> +} >> + >> extern unsigned long __clear_user(void __user *addr, unsigned long size); >> >> static inline unsigned long clear_user(void __user *addr, unsigned long size) >>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 77f6ebf97113..4316e36095a2 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -137,6 +137,7 @@ config PPC select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64 + select ARCH_HAS_UACCESS_MCSAFE if PPC64 select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_KEEP_MEMBLOCK diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h index 8b03eb44e876..15002b51ff18 100644 --- a/arch/powerpc/include/asm/uaccess.h +++ b/arch/powerpc/include/asm/uaccess.h @@ -387,6 +387,20 @@ static inline unsigned long raw_copy_to_user(void __user *to, return ret; } +static __always_inline unsigned long __must_check +copy_to_user_mcsafe(void __user *to, const void *from, unsigned long n) +{ + if (likely(check_copy_size(from, n, true))) { + if (access_ok(to, n)) { + allow_write_to_user(to, n); + n = memcpy_mcsafe((void *)to, from, n); + prevent_write_to_user(to, n); + } + } + + return n; +} + extern unsigned long __clear_user(void __user *addr, unsigned long size); static inline unsigned long clear_user(void __user *addr, unsigned long size)
Use memcpy_mcsafe() implementation to define copy_to_user_mcsafe() Signed-off-by: Santosh Sivaraj <santosh@fossix.org> --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/uaccess.h | 14 ++++++++++++++ 2 files changed, 15 insertions(+)