Add scenarios get_user to machine check safe. The processing of
EX_TYPE_UACCESS_ERR_ZERO and EX_TYPE_UACCESS_ERR_ZERO_UCE_RECOVERY is same
and both return -EFAULT.
Signed-off-by: Tong Tiangen <tongtiangen@xxxxxxxxxx>
---
arch/arm64/include/asm/asm-extable.h | 14 +++++++++++++-
arch/arm64/include/asm/uaccess.h | 2 +-
arch/arm64/mm/extable.c | 1 +
3 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/asm-extable.h b/arch/arm64/include/asm/asm-extable.h
index 74d1db74fd86..bfc2d224cbae 100644
--- a/arch/arm64/include/asm/asm-extable.h
+++ b/arch/arm64/include/asm/asm-extable.h
@@ -10,8 +10,11 @@
/* _MC indicates that can fixup from machine check errors */
#define EX_TYPE_FIXUP_MC 5
+#define EX_TYPE_UACCESS_ERR_ZERO_MC 6
-#define IS_EX_TYPE_MC(type) (type == EX_TYPE_FIXUP_MC)
+#define IS_EX_TYPE_MC(type) \
+ (type == EX_TYPE_FIXUP_MC || \
+ type == EX_TYPE_UACCESS_ERR_ZERO_MC)
#ifdef __ASSEMBLY__
@@ -77,6 +80,15 @@
#define EX_DATA_REG(reg, gpr) \
"((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
+#define _ASM_EXTABLE_UACCESS_ERR_ZERO_MC(insn, fixup, err, zero) \
+ __DEFINE_ASM_GPR_NUMS \
+ __ASM_EXTABLE_RAW(#insn, #fixup, \
+ __stringify(EX_TYPE_UACCESS_ERR_ZERO_MC), \
+ "(" \
+ EX_DATA_REG(ERR, err) " | " \
+ EX_DATA_REG(ZERO, zero) \
+ ")")
+
#define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
__DEFINE_ASM_GPR_NUMS \
__ASM_EXTABLE_RAW(#insn, #fixup, \
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
index e8dce0cc5eaa..24b662407fbd 100644
--- a/arch/arm64/include/asm/uaccess.h
+++ b/arch/arm64/include/asm/uaccess.h
@@ -236,7 +236,7 @@ static inline void __user *__uaccess_mask_ptr(const void __user *ptr)
asm volatile( \
"1: " load " " reg "1, [%2]\n" \
"2:\n" \
- _ASM_EXTABLE_UACCESS_ERR_ZERO(1b, 2b, %w0, %w1) \
+ _ASM_EXTABLE_UACCESS_ERR_ZERO_MC(1b, 2b, %w0, %w1) \
: "+r" (err), "=&r" (x) \
: "r" (addr))
diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c
index f1134c88e849..7c05f8d2bce0 100644
--- a/arch/arm64/mm/extable.c
+++ b/arch/arm64/mm/extable.c
@@ -95,6 +95,7 @@ bool fixup_exception(struct pt_regs *regs, unsigned int esr)
case EX_TYPE_BPF:
return ex_handler_bpf(ex, regs);
case EX_TYPE_UACCESS_ERR_ZERO:
+ case EX_TYPE_UACCESS_ERR_ZERO_MC:
return ex_handler_uaccess_err_zero(ex, regs);
case EX_TYPE_LOAD_UNALIGNED_ZEROPAD:
return ex_handler_load_unaligned_zeropad(ex, regs);
--
2.18.0.huawei.25
