diff options
| author | Diana Craciun <diana.craciun@nxp.com> | 2019-04-11 21:46:18 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-17 08:36:42 +0200 |
| commit | d91460f2d0efc0fe6a197fc739e30edab6070456 (patch) | |
| tree | f8b159803a00736195ee0541c23a523df01188b4 /arch/powerpc/kernel/vmlinux.lds.S | |
| parent | ae361096d6857727275631d1d64bcd8fec2d8f25 (diff) | |
powerpc/fsl: Add infrastructure to fixup branch predictor flush
commit 76a5eaa38b15dda92cd6964248c39b5a6f3a4e9d upstream.
In order to protect against speculation attacks (Spectre
variant 2) on NXP PowerPC platforms, the branch predictor
should be flushed when the privillege level is changed.
This patch is adding the infrastructure to fixup at runtime
the code sections that are performing the branch predictor flush
depending on a boot arg parameter which is added later in a
separate patch.
Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/powerpc/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/powerpc/kernel/vmlinux.lds.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S index 5c6cf58943b9..50d365060855 100644 --- a/arch/powerpc/kernel/vmlinux.lds.S +++ b/arch/powerpc/kernel/vmlinux.lds.S @@ -164,6 +164,14 @@ SECTIONS } #endif /* CONFIG_PPC_BARRIER_NOSPEC */ +#ifdef CONFIG_PPC_FSL_BOOK3E + . = ALIGN(8); + __spec_btb_flush_fixup : AT(ADDR(__spec_btb_flush_fixup) - LOAD_OFFSET) { + __start__btb_flush_fixup = .; + *(__btb_flush_fixup) + __stop__btb_flush_fixup = .; + } +#endif EXCEPTION_TABLE(0) NOTES :kernel :notes |