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Subject[PATCH] arm64: armv8_deprecated: Fix undef_hook mask for thumb setend
Date
Use a full 32-bit mask to prevent accidental matchings of thumb32
instructions where the second half-word is equal to the thumb16 setend
encoding.

This fixes the same problem as the following patch:

https://lkml.org/lkml/2020/3/16/341

but for setend emulation instead.

Signed-off-by: Fredrik Strupe <fredrik@strupe.net>
---
arch/arm64/kernel/armv8_deprecated.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
index 9d3442d62..8c06dfee0 100644
--- a/arch/arm64/kernel/armv8_deprecated.c
+++ b/arch/arm64/kernel/armv8_deprecated.c
@@ -609,7 +609,7 @@ static struct undef_hook setend_hooks[] = {
},
{
/* Thumb mode */
- .instr_mask = 0x0000fff7,
+ .instr_mask = 0xfffffff7,
.instr_val = 0x0000b650,
.pstate_mask = (PSR_AA32_T_BIT | PSR_AA32_MODE_MASK),
.pstate_val = (PSR_AA32_T_BIT | PSR_AA32_MODE_USR),
--
2.20.1
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