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Subject[PATCH 3.18 20/50] arm64/kernel: fix incorrect EL0 check in inv_entry macro
3.18-stable review patch.  If anyone has any objections, please let me know.


[ Upstream commit b660950c60a7278f9d8deb7c32a162031207c758 ]

The implementation of macro inv_entry refers to its 'el' argument without
the required leading backslash, which results in an undefined symbol
'el' to be passed into the kernel_entry macro rather than the index of
the exception level as intended.

This undefined symbol strangely enough does not result in build failures,
although it is visible in vmlinux:

$ nm -n vmlinux |head
U el
0000000000000000 A _kernel_flags_le_hi32
0000000000000000 A _kernel_offset_le_hi32
0000000000000000 A _kernel_size_le_hi32
000000000000000a A _kernel_flags_le_lo32

However, it does result in incorrect code being generated for invalid
exceptions taken from EL0, since the argument check in kernel_entry
assumes EL1 if its argument does not equal '0'.

Signed-off-by: Ard Biesheuvel <>
Signed-off-by: Catalin Marinas <>
Signed-off-by: Sasha Levin <>
arch/arm64/kernel/entry.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 00f7ba3d82b8..2dfbb831e4af 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -234,7 +234,7 @@ END(vectors)
* Invalid mode handlers
.macro inv_entry, el, reason, regsize = 64
- kernel_entry el, \regsize
+ kernel_entry \el, \regsize
mov x0, sp
mov x1, #\reason
mrs x2, esr_el1

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