[FUTEX] Fix address computation in compat code.

compat_exit_robust_list() computes a pointer to the
futex entry in userspace as follows:

	(void __user *)entry + futex_offset

'entry' is a 'struct robust_list __user *', and
'futex_offset' is a 'compat_long_t' (typically a 's32').

Things explode if the 32-bit sign bit is set in futex_offset.

Type promotion sign extends futex_offset to a 64-bit value before
adding it to 'entry'.

This triggered a problem on sparc64 running 32-bit applications which
would lock up a cpu looping forever in the fault handling for the
userspace load in handle_futex_death().

Compat userspace runs with address masking (wherein the cpu zeros out
the top 32-bits of every effective address given to a memory operation
instruction) so the sparc64 fault handler accounts for this by
zero'ing out the top 32-bits of the fault address too.

Since the kernel properly uses the compat_uptr interfaces, kernel side
accesses to compat userspace work too since they will only use
addresses with the top 32-bit clear.

Because of this compat futex layer bug we get into the following loop
when executing the get_user() load near the top of handle_futex_death():

1) load from address '0xfffffffff7f16bd8', FAULT
2) fault handler clears upper 32-bits, processes fault
   for address '0xf7f16bd8' which succeeds
3) goto #1

I want to thank Bernd Zeimetz, Josip Rodin, and Fabio Massimo Di Nitto
for their tireless efforts helping me track down this bug.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 19 insertions, 7 deletions

diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 00b572666cc7..0a43def6fee7 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -30,6 +30,15 @@ fetch_robust_entry(compat_uptr_t *uentry, struct robust_list __user **entry,
         return 0;
 }
 
+static void __user *futex_uaddr(struct robust_list *entry,
+                                compat_long_t futex_offset)
+{
+        compat_uptr_t base = ptr_to_compat(entry);
+        void __user *uaddr = compat_ptr(base + futex_offset);
+
+        return uaddr;
+}
+
 /*
  * Walk curr->robust_list (very carefully, it's a userspace list!)
  * and mark any locks found there dead, and notify any waiters.
@@ -76,11 +85,12 @@ void compat_exit_robust_list(struct task_struct *curr)
                  * A pending lock might already be on the list, so
                  * dont process it twice:
                  */
-                if (entry != pending)
-                        if (handle_futex_death((void __user *)entry + futex_offset,
-                                                curr, pi))
-                                return;
+                if (entry != pending) {
+                        void __user *uaddr = futex_uaddr(entry, futex_offset);
 
+                        if (handle_futex_death(uaddr, curr, pi))
+                                return;
+                }
                 if (rc)
                         return;
                 uentry = next_uentry;
@@ -94,9 +104,11 @@ void compat_exit_robust_list(struct task_struct *curr)
 
                 cond_resched();
         }
-        if (pending)
-                handle_futex_death((void __user *)pending + futex_offset,
-                                   curr, pip);
+        if (pending) {
+                void __user *uaddr = futex_uaddr(pending, futex_offset);
+
+                handle_futex_death(uaddr, curr, pip);
+        }
 }
 
 asmlinkage long