From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Mon, 11 Sep 2017 11:24:22 +0200
Subject: [PATCH] s390/guarded storage: fix possible memory corruption
Git-commit: fa1edf3f63c05ca8eacafcd7048ed91e5360f1a8
Patch-Mainline: v4.15-rc1
References: bsc#1079840

For PREEMPT enabled kernels the guarded storage (GS) code contains a
possible use-after-free bug. If a task that makes use of GS exits, it
will execute do_exit() while still enabled for preemption.

That function will call exit_thread_runtime_instr() via exit_thread().
If exit_thread_gs() gets preempted after the GS control block of the
task has been freed but before the pointer to it is set to NULL, then
save_gs_cb(), called from switch_to(), will write to already freed
memory.

Avoid this and simply disable preemption while freeing the control
block and setting the pointer to NULL.

Fixes: 916cda1aa1b4 ("s390: add a system call for guarded storage")
Cc: <stable@vger.kernel.org> # v4.12+
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 arch/s390/kernel/guarded_storage.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/kernel/guarded_storage.c b/arch/s390/kernel/guarded_storage.c
index 6f064745c3b1..4920cf6ffa00 100644
--- a/arch/s390/kernel/guarded_storage.c
+++ b/arch/s390/kernel/guarded_storage.c
@@ -13,9 +13,11 @@
 
 void exit_thread_gs(void)
 {
+	preempt_disable();
 	kfree(current->thread.gs_cb);
 	kfree(current->thread.gs_bc_cb);
 	current->thread.gs_cb = current->thread.gs_bc_cb = NULL;
+	preempt_enable();
 }
 
 static int gs_enable(void)
-- 
2.12.3