[PATCH v4 4/8] s390/mm: Fix handling of vmalloc area in do_secure_storage_access()

[Heiko Carstens <hca@linux.ibm.com>]

Secure storage access exceptions in vmalloc area need to be handled
separately since folio_try_get() or virt_to_phys() do not work on such
addresses. Given that there cannot be a valid access let such exceptions
fail immediately. The kernel will either fixup or crash.

Tested-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
 arch/s390/mm/fault.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index f150d97cac2e..e650cdfa2523 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -438,6 +438,8 @@ void do_secure_storage_access(struct pt_regs *regs)
 		panic("Unexpected PGM 0x3d with TEID bit 61=0");
 	}
 	if (is_kernel_fault(regs)) {
+		if (is_vmalloc_addr((void *)addr))
+			return handle_fault_error_nolock(regs, 0);
 		folio = virt_to_folio((void *)addr);
 		if (unlikely(!folio_try_get(folio)))
 			return;
-- 
2.53.0