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parisc: Don't call faulthandler_disabled() in do_page_fault()

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It is dangerous to call faulthandler_disabled() when user_mode(regs)
is true.  The task pagefault_disabled counter is racy and it is not
updated atomically on parisc. As a result, calling faulthandler_disabled()
may cause erroneous termination.

We now handle execption fixups and termination when user_mode(regs) is
false in handle_interruption(). Thus, we can just remove the
faulthandler_disabled() check from do_page_fault().

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
John David Anglin 2022-01-04 21:34:26 +00:00 committed by Helge Deller
parent 4b9d2a731c
commit 9d90a90855
1 changed files with 0 additions and 3 deletions
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3
arch/parisc/mm/fault.c
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@ -267,9 +267,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
vm_fault_t fault = 0;
unsigned int flags;
if (faulthandler_disabled())
goto no_context;
tsk = current;
mm = tsk->mm;
if (!mm)