From: Mark Rutland Date: Wed, 16 Oct 2019 11:03:04 +0000 (+0100) Subject: arm64: mm: fix inverted PAR_EL1.F check X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3813733595c0c7c0674d106309b04e871d54dc1c;p=linux.git arm64: mm: fix inverted PAR_EL1.F check When detecting a spurious EL1 translation fault, we have the CPU retry the translation using an AT S1E1R instruction, and inspect PAR_EL1 to determine if the fault was spurious. When PAR_EL1.F == 0, the AT instruction successfully translated the address without a fault, which implies the original fault was spurious. However, in this case we return false and treat the original fault as if it was not spurious. Invert the return value so that we treat such a case as spurious. Cc: Catalin Marinas Fixes: 42f91093b043 ("arm64: mm: Ignore spurious translation faults taken from the kernel") Tested-by: James Morse Signed-off-by: Mark Rutland Signed-off-by: Will Deacon --- diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 855f2a7954e69..9fc6db0bcbad0 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -268,8 +268,12 @@ static bool __kprobes is_spurious_el1_translation_fault(unsigned long addr, par = read_sysreg(par_el1); local_irq_restore(flags); + /* + * If we now have a valid translation, treat the translation fault as + * spurious. + */ if (!(par & SYS_PAR_EL1_F)) - return false; + return true; /* * If we got a different type of fault from the AT instruction,