[ Bernd, Josip, and Fabio, I think I finally nailed this
cpu hang bug we were all seeing on sparc64. ]
[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-bits 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 <[email protected]>
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 00b5726..8089e7e 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -76,11 +76,16 @@ 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;
+ compat_uptr_t base;
+
+ base = ptr_to_compat(entry);
+ uaddr = compat_ptr(base + futex_offset);
+ if (handle_futex_death(uaddr, curr, pi))
+ return;
+ }
if (rc)
return;
uentry = next_uentry;
-
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