tile: use si_int instead of si_ptr for compat_siginfo

To be compatible with the generic get_compat_sigevent(), the
copy_siginfo_to_user32() and thus copy_siginfo_from_user32()
have to use si_int instead of si_ptr.  Using si_ptr means that
for the case of ILP32 compat code running in big-endian mode,
we would end up copying the high 32 bits of the pointer value
into si_int instead of the desired low 32 bits.

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c
index 8c5abf2e4794..c52e6fd3c438 100644
--- a/arch/tile/kernel/compat_signal.c
+++ b/arch/tile/kernel/compat_signal.c
@@ -68,7 +68,7 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *fr
         if (from->si_code < 0) {
                 err |= __put_user(from->si_pid, &to->si_pid);
                 err |= __put_user(from->si_uid, &to->si_uid);
-                err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
+                err |= __put_user(from->si_int, &to->si_int);
         } else {
                 /*
                  * First 32bits of unions are always present:
@@ -93,8 +93,7 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *fr
                         break;
                 case __SI_TIMER >> 16:
                         err |= __put_user(from->si_overrun, &to->si_overrun);
-                        err |= __put_user(ptr_to_compat(from->si_ptr),
-                                          &to->si_ptr);
+                        err |= __put_user(from->si_int, &to->si_int);
                         break;
                          /* This is not generated by the kernel as of now.  */
                 case __SI_RT >> 16:
@@ -110,19 +109,19 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *fr
 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
 {
         int err;
-        u32 ptr32;
 
         if (!access_ok(VERIFY_READ, from, sizeof(struct compat_siginfo)))
                 return -EFAULT;
 
+        memset(to, 0, sizeof(*to));
+
         err = __get_user(to->si_signo, &from->si_signo);
         err |= __get_user(to->si_errno, &from->si_errno);
         err |= __get_user(to->si_code, &from->si_code);
 
         err |= __get_user(to->si_pid, &from->si_pid);
         err |= __get_user(to->si_uid, &from->si_uid);
-        err |= __get_user(ptr32, &from->si_ptr);
-        to->si_ptr = compat_ptr(ptr32);
+        err |= __get_user(to->si_int, &from->si_int);
 
         return err;
 }