diff options
| -rw-r--r-- | arch/mips/kernel/signal.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index c9b2a75563e1..c1632e87b679 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -563,6 +563,13 @@ 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. |