4.14-stable review patch. If anyone has any objections, please let me know.
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From: Diana Craciun diana.craciun@nxp.com
commit dfa88658fb0583abb92e062c7a9cd5a5b94f2a46 upstream.
Report branch predictor state flush as a mitigation for Spectre variant 2.
Signed-off-by: Diana Craciun diana.craciun@nxp.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/kernel/security.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -212,8 +212,11 @@ ssize_t cpu_show_spectre_v2(struct devic
if (count_cache_flush_type == COUNT_CACHE_FLUSH_HW) seq_buf_printf(&s, "(hardware accelerated)"); - } else + } else if (btb_flush_enabled) { + seq_buf_printf(&s, "Mitigation: Branch predictor state flush"); + } else { seq_buf_printf(&s, "Vulnerable"); + }
seq_buf_printf(&s, "\n");