From d26654e5f9cd27815ab5bc8148c826f3b960396c Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 20 Sep 2012 15:49:09 -0400 Subject: [PATCH] openrisk: fix altstack switching on sigreturn do_sigaltstack() expects _userland_ address, TYVM... Signed-off-by: Al Viro --- arch/openrisc/kernel/signal.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index 30110297f4f9..ddedc8a77861 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -84,7 +84,6 @@ asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs) { struct rt_sigframe *frame = (struct rt_sigframe __user *)regs->sp; sigset_t set; - stack_t st; /* * Since we stacked the signal on a dword boundary, @@ -104,11 +103,10 @@ asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs) if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) goto badframe; - if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) - goto badframe; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ - do_sigaltstack(&st, NULL, regs->sp); + if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) + goto badframe; return regs->gpr[11]; -- 2.20.1