[PATCH -next v7 3/4] arm64: add uaccess to machine check safe

Tong Tiangen tongtiangen at huawei.com
Fri Aug 12 17:05:56 AEST 2022


If user access fail due to hardware memory error, only the relevant
processes are affected, so killing the user process and isolate the
error page with hardware memory errors is a more reasonable choice
than kernel panic.

Signed-off-by: Tong Tiangen <tongtiangen at huawei.com>
---
 arch/arm64/mm/extable.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c
index 478e639f8680..28ec35e3d210 100644
--- a/arch/arm64/mm/extable.c
+++ b/arch/arm64/mm/extable.c
@@ -85,10 +85,10 @@ bool fixup_exception_mc(struct pt_regs *regs)
 	if (!ex)
 		return false;
 
-	/*
-	 * This is not complete, More Machine check safe extable type can
-	 * be processed here.
-	 */
+	switch (ex->type) {
+	case EX_TYPE_UACCESS_ERR_ZERO:
+		return ex_handler_uaccess_err_zero(ex, regs);
+	}
 
 	return false;
 }
-- 
2.25.1



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