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authorWill Deacon <will@kernel.org>2019-10-15 21:04:18 -0700
committerWill Deacon <will@kernel.org>2019-10-16 10:11:38 -0700
commit597399d0cb91d049fcb78fb45c7694771b583bb7 (patch)
tree3cb46f903b734e7bae7a63e3cde1f0872398efdc /arch/arm64/include/asm/kvm_hyp.h
parent3813733595c0c7c0674d106309b04e871d54dc1c (diff)
downloadlinux-597399d0cb91d049fcb78fb45c7694771b583bb7.tar.bz2
arm64: tags: Preserve tags for addresses translated via TTBR1
Sign-extending TTBR1 addresses when converting to an untagged address breaks the documented POSIX semantics for mlock() in some obscure error cases where we end up returning -EINVAL instead of -ENOMEM as a direct result of rewriting the upper address bits. Rework the untagged_addr() macro to preserve the upper address bits for TTBR1 addresses and only clear the tag bits for user addresses. This matches the behaviour of the 'clear_address_tag' assembly macro, so rename that and align the implementations at the same time so that they use the same instruction sequences for the tag manipulation. Link: https://lore.kernel.org/stable/20191014162651.GF19200@arrakis.emea.arm.com/ Reported-by: Jan Stancek <jstancek@redhat.com> Tested-by: Jan Stancek <jstancek@redhat.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/kvm_hyp.h')
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