x86/split-lock: Avoid returning with interrupts enabled

When a split lock is detected always make sure to disable interrupts
before returning from the trap handler.

The kernel exit code assumes that all exits run with interrupts
disabled, otherwise the SWAPGS sequence can race against interrupts and
cause recursing page faults and later panics.

The problem will only happen on CPUs with split lock disable
functionality, so Icelake Server, Tiger Lake, Snow Ridge, Jacobsville.

Fixes: ca4c6a9858c2 ("x86/traps: Make interrupt enable/disable symmetric in C code")
Fixes: bce9b042ec73 ("x86/traps: Disable interrupts in exc_aligment_check()") # v5.8+
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index fb55981f2a0d0d55459944ac0025e87c0d4c05dc..7f5aec758f0eeac2d9bcebcd80963bc9d79e7ab3 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -303,11 +303,12 @@ DEFINE_IDTENTRY_ERRORCODE(exc_alignment_check)
        local_irq_enable();
 
        if (handle_user_split_lock(regs, error_code))
-               return;
+               goto out;
 
        do_trap(X86_TRAP_AC, SIGBUS, "alignment check", regs,
                error_code, BUS_ADRALN, NULL);
 
+out:
        local_irq_disable();
 }