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arm64: mm: don't print out page table entries on EL0 faults

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commit bf396c09c2447a787d02af34cf167e953f85fa42 upstream.

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.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kristina Martsenko 2017-06-09 16:35:53 +01:00 committed by Greg Kroah-Hartman
parent 9cec5be387
commit ee254b4d29
1 changed files with 0 additions and 1 deletions
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arch/arm64/mm/fault.c
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@ -231,7 +231,6 @@ 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);
}