From a8a4b03ab95f3e99196b0a4dd40804620ea77e74 Mon Sep 17 00:00:00 2001 From: Madhavan Srinivasan Date: Sun, 20 Aug 2017 23:28:24 +0530 Subject: powerpc: Hard wire PT_SOFTE value to 1 in ptrace & signals We have always had softe in pt_regs, and accessible via PT_SOFTE, even though it is not userspace state. The value userspace sees should always be 1, because we should never be in userspace with interrupts soft disabled. In a subsequent patch we will be changing the semantics of the kernel softe value, so hard wire the value to 1 to retain the existing semantics. As far as we know nothing ever looks at it, but better safe than sorry. Signed-off-by: Madhavan Srinivasan [mpe: Split out of larger patch, write change log] Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/signal_64.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/powerpc/kernel/signal_64.c') diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c index 4b9ca3570344..2705fba544ad 100644 --- a/arch/powerpc/kernel/signal_64.c +++ b/arch/powerpc/kernel/signal_64.c @@ -110,6 +110,8 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs = tsk->thread.regs; unsigned long msr = regs->msr; long err = 0; + /* Force usr to alway see softe as 1 (interrupts enabled) */ + unsigned long softe = 0x1; BUG_ON(tsk != current); @@ -169,6 +171,7 @@ static long setup_sigcontext(struct sigcontext __user *sc, WARN_ON(!FULL_REGS(regs)); err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE); err |= __put_user(msr, &sc->gp_regs[PT_MSR]); + err |= __put_user(softe, &sc->gp_regs[PT_SOFTE]); err |= __put_user(signr, &sc->signal); err |= __put_user(handler, &sc->handler); if (set != NULL) -- cgit v1.2.3