diff options
Diffstat (limited to '')
-rw-r--r-- | arch/mips/kernel/signal.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index c9b2a75563e1..479999b7f2de 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -25,7 +25,7 @@ #include <linux/compiler.h> #include <linux/syscalls.h> #include <linux/uaccess.h> -#include <linux/tracehook.h> +#include <linux/resume_user_mode.h> #include <asm/abi.h> #include <asm/asm.h> @@ -35,7 +35,6 @@ #include <asm/sim.h> #include <asm/ucontext.h> #include <asm/cpu-features.h> -#include <asm/war.h> #include <asm/dsp.h> #include <asm/inst.h> #include <asm/msa.h> @@ -563,6 +562,13 @@ void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, sp = regs->regs[29]; /* + * If we are on the alternate signal stack and would overflow it, don't. + * Return an always-bogus address instead so we will die with SIGSEGV. + */ + if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size))) + return (void __user __force *)(-1UL); + + /* * FPU emulator may have it's own trampoline active just * above the user stack, 16-bytes before the next lowest * 16 byte boundary. Try to avoid trashing it. @@ -747,23 +753,25 @@ static int setup_rt_frame(void *sig_return, struct ksignal *ksig, struct pt_regs *regs, sigset_t *set) { struct rt_sigframe __user *frame; - int err = 0; frame = get_sigframe(ksig, regs, sizeof(*frame)); if (!access_ok(frame, sizeof (*frame))) return -EFAULT; /* Create siginfo. */ - err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info); + if (copy_siginfo_to_user(&frame->rs_info, &ksig->info)) + return -EFAULT; /* Create the ucontext. */ - err |= __put_user(0, &frame->rs_uc.uc_flags); - err |= __put_user(NULL, &frame->rs_uc.uc_link); - err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); - err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); - err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); - - if (err) + if (__put_user(0, &frame->rs_uc.uc_flags)) + return -EFAULT; + if (__put_user(NULL, &frame->rs_uc.uc_link)) + return -EFAULT; + if (__save_altstack(&frame->rs_uc.uc_stack, regs->regs[29])) + return -EFAULT; + if (setup_sigcontext(regs, &frame->rs_uc.uc_mcontext)) + return -EFAULT; + if (__copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set))) return -EFAULT; /* @@ -907,7 +915,7 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, do_signal(regs); if (thread_info_flags & _TIF_NOTIFY_RESUME) - tracehook_notify_resume(regs); + resume_user_mode_work(regs); user_enter(); } |