diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-05-02 21:14:30 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-06-01 13:01:27 -0400 |
| commit | 29bf5dd895219e5111099908040aecfc1509f9bb (patch) | |
| tree | 222ad7f7a5dbcb92a58ce36f9b6bf1b4354c0980 | |
| parent | 35d51807577d4ab10f321ef22e4dcea30bee1caa (diff) | |
blackfin: check __get_user() return value
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | arch/blackfin/kernel/signal.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/arch/blackfin/kernel/signal.c b/arch/blackfin/kernel/signal.c index 35459e681483..6682b73a8523 100644 --- a/arch/blackfin/kernel/signal.c +++ b/arch/blackfin/kernel/signal.c @@ -187,17 +187,22 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t * info, err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); if (err) - goto give_sigsegv; + return -EFAULT; /* Set up registers for signal handler */ - wrusp((unsigned long)frame); if (current->personality & FDPIC_FUNCPTRS) { struct fdpic_func_descriptor __user *funcptr = (struct fdpic_func_descriptor *) ka->sa.sa_handler; - __get_user(regs->pc, &funcptr->text); - __get_user(regs->p3, &funcptr->GOT); + u32 pc, p3; + err |= __get_user(pc, &funcptr->text); + err |= __get_user(p3, &funcptr->GOT); + if (err) + return -EFAULT; + regs->pc = pc; + regs->p3 = p3; } else regs->pc = (unsigned long)ka->sa.sa_handler; + wrusp((unsigned long)frame); regs->rets = SIGRETURN_STUB; regs->r0 = frame->sig; @@ -205,10 +210,6 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t * info, regs->r2 = (unsigned long)(&frame->uc); return 0; - - give_sigsegv: - force_sigsegv(sig, current); - return -EFAULT; } static inline void @@ -248,20 +249,17 @@ static void handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs) { - int ret; - /* are we from a system call? to see pt_regs->orig_p0 */ if (regs->orig_p0 >= 0) /* If so, check system call restarting.. */ handle_restart(regs, ka, 1); /* set up the stack frame */ - ret = setup_rt_frame(sig, ka, info, sigmask_to_save(), regs); - if (ret) - return; - - signal_delivered(sig, info, ka, regs, - test_thread_flag(TIF_SINGLESTEP)); + if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs) < 0) + force_sigsegv(sig, current); + else + signal_delivered(sig, info, ka, regs, + test_thread_flag(TIF_SINGLESTEP)); } /* |