Commit 308c5156 authored by Mark Rutland's avatar Mark Rutland Committed by Will Deacon

arm64: mm: fix spurious fault detection

When detecting a spurious EL1 translation fault, we attempt to compare
ESR_EL1.DFSC with PAR_EL1.FST. We erroneously use FIELD_PREP() to
extract PAR_EL1.FST, when we should be using FIELD_GET().

In the wise words of Robin Murphy:

| FIELD_GET() is a UBFX, FIELD_PREP() is a BFI

Using FIELD_PREP() means that that dfsc & ESR_ELx_FSC_TYPE is always
zero, and hence not equal to ESR_ELx_FSC_FAULT. Thus we detect any
unhandled translation fault as spurious.

... so let's use FIELD_GET() to ensure we don't decide all translation
faults are spurious. ESR_EL1.DFSC occupies bits [5:0], and requires no
shifting.

Fixes: 42f91093 ("arm64: mm: Ignore spurious translation faults taken from the kernel")
Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Reported-by: default avatarRobin Murphy <robin.murphy@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will.deacon@kernel.org>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent dd8a1f13
......@@ -275,7 +275,7 @@ static bool __kprobes is_spurious_el1_translation_fault(unsigned long addr,
* If we got a different type of fault from the AT instruction,
* treat the translation fault as spurious.
*/
dfsc = FIELD_PREP(SYS_PAR_EL1_FST, par);
dfsc = FIELD_GET(SYS_PAR_EL1_FST, par);
return (dfsc & ESR_ELx_FSC_TYPE) != ESR_ELx_FSC_FAULT;
}
......
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