From 90653a84052cfbbc1f46427f851dad14083e36df Mon Sep 17 00:00:00 2001 From: "Naveen N. Rao" Date: Thu, 29 Jun 2017 23:19:20 +0530 Subject: [PATCH] powerpc/64s: Blacklist rtas entry/exit from kprobes We can't take traps with relocation off, so blacklist enter_rtas() and rtas_return_loc(). However, instead of blacklisting all of enter_rtas(), introduce a new symbol __enter_rtas from where on we can't take a trap and blacklist that. Signed-off-by: Naveen N. Rao Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/entry_64.S | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index d5be463b2fa4..49d8422767b4 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -1091,6 +1091,8 @@ _GLOBAL(enter_rtas) rldicr r9,r9,MSR_SF_LG,(63-MSR_SF_LG) ori r9,r9,MSR_IR|MSR_DR|MSR_FE0|MSR_FE1|MSR_FP|MSR_RI|MSR_LE andc r6,r0,r9 + +__enter_rtas: sync /* disable interrupts so SRR0/1 */ mtmsrd r0 /* don't get trashed */ @@ -1127,6 +1129,8 @@ rtas_return_loc: mtspr SPRN_SRR1,r4 rfid b . /* prevent speculative execution */ +_ASM_NOKPROBE_SYMBOL(__enter_rtas) +_ASM_NOKPROBE_SYMBOL(rtas_return_loc) .align 3 1: .llong rtas_restore_regs -- 2.20.1