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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-03-18 10:58:09 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-03 06:22:10 +0200 |
| commit | 0c99d0dc291d5f310ad64ceda22ec52006848cd8 (patch) | |
| tree | c2aea68ab2a16889f548ba1f58eee83330abbe27 /arch/arm64 | |
| parent | ea4147e618204318775668fe5016cb3f0fb505c6 (diff) | |
| download | linux-rt-0c99d0dc291d5f310ad64ceda22ec52006848cd8.tar.gz | |
arm64/kernel: fix incorrect EL0 check in inv_entry macro
[ 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 <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kernel/entry.S | 2 |
1 files changed, 1 insertions, 1 deletions
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 |