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powerpc: add machine check safe copy_to_user 

Use  memcpy_mcsafe() implementation to define copy_to_user_mcsafe()

Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820081352.8641-8-santosh@fossix.org
This commit is contained in:
Santosh Sivaraj 2019-08-20 13:43:52 +05:30 committed by Michael Ellerman
parent 4d4a273854
commit 42ac26d253
2 changed files with 15 additions and 0 deletions
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1
arch/powerpc/Kconfig
View File

@ -137,6 +137,7 @@ config PPC
select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION) 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_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAS_UACCESS_FLUSHCACHE select ARCH_HAS_UACCESS_FLUSHCACHE
select ARCH_HAS_UACCESS_MCSAFE if PPC64
select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_KEEP_MEMBLOCK select ARCH_KEEP_MEMBLOCK

14
arch/powerpc/include/asm/uaccess.h
View File

@ -387,6 +387,20 @@ static inline unsigned long raw_copy_to_user(void __user *to,
return ret; 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); extern unsigned long __clear_user(void __user *addr, unsigned long size);
static inline unsigned long clear_user(void __user *addr, unsigned long size) static inline unsigned long clear_user(void __user *addr, unsigned long size)