[PATCH v2 2/3] arm64: mm: don't print out page table entries on EL0 faults

[Kristina Martsenko]

When we take a fault from EL0 that can't be handled, we print out the
page table entries associated with the faulting address. This allows
userspace to print out any current page table entries, including kernel
(TTBR1) entries. Exposing kernel mappings like this could pose a
security risk, so don't print out page table information on EL0 faults.
(But still print it out for EL1 faults.) This also follows the same
behaviour as x86, printing out page table entries on kernel mode faults
but not user mode faults.

Signed-off-by: Kristina Martsenko <kristina.martsenko at arm.com>
---

v2:
 - mention x86 in commit message

 arch/arm64/mm/fault.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index a9dfb37c87a2..b070dcd50ed0 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -259,7 +259,6 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
 		pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
 			tsk->comm, task_pid_nr(tsk), inf->name, sig,
 			addr, esr);
-		show_pte(addr);
 		__show_regs(regs);
 	}
 
-- 
2.1.4