Merge with 2.4.0-test1.

1 files changed, 31 insertions, 1 deletions

diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
index ff12b9e8d..1f70c98e6 100644
--- a/arch/alpha/kernel/signal.c
+++ b/arch/alpha/kernel/signal.c
@@ -36,6 +36,36 @@ asmlinkage int do_signal(sigset_t *, struct pt_regs *,
 			 struct switch_stack *, unsigned long, unsigned long);
 
 
+int copy_siginfo_to_user(siginfo_t *to, siginfo_t *from)
+{
+	if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t)))
+		return -EFAULT;
+	if (from->si_code < 0)
+		return __copy_to_user(to, from, sizeof(siginfo_t));
+	else {
+		int err;
+
+		/* If you change siginfo_t structure, please be sure
+		   this code is fixed accordingly.
+		   It should never copy any pad contained in the structure
+		   to avoid security leaks, but must copy the generic
+		   3 ints plus the relevant union member.  */
+		err = __put_user(*(long *)&from->si_signo, (long *)&to->si_signo);
+		err |= __put_user((short)from->si_code, &to->si_code);
+		switch (from->si_code >> 16) {
+		case __SI_CHLD >> 16:
+			err |= __put_user(from->si_utime, &to->si_utime);
+			err |= __put_user(from->si_stime, &to->si_stime);
+			err |= __put_user(from->si_status, &to->si_status);
+		default:
+			err |= __put_user(from->si_addr, &to->si_addr);
+			break;
+		/* case __SI_RT: This is not generated by the kernel as of now.  */
+		}
+		return err;
+	}
+}
+
 /*
  * The OSF/1 sigprocmask calling sequence is different from the
  * C sigprocmask() sequence..
@@ -489,7 +519,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	if (verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
 		goto give_sigsegv;
 
-	err |= __copy_to_user(&frame->info, info, sizeof(siginfo_t));
+	err |= copy_siginfo_to_user(&frame->info, info);
 
 	/* Create the ucontext.  */
 	err |= __put_user(0, &frame->uc.uc_flags);