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| author | Reiji Watanabe <reijiw@google.com> | 2021-12-06 03:47:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 13:03:28 +0300 |
| commit | c7f0c087d483b586516520bd88deb712d3b31925 (patch) | |
| tree | 408a14b7caea98f9d0675e4ddf23dd434cf7d8b2 /samples | |
| parent | 338c297e08851387d26eca98b6069fb5c812fad1 (diff) | |
| download | linux-c7f0c087d483b586516520bd88deb712d3b31925.tar.xz | |
arm64: mte: DC {GVA,GZVA} shouldn't be used when DCZID_EL0.DZP == 1
[ Upstream commit 685e2564daa1493053fcd7f1dbed38b35ee2f3cb ]
Currently, mte_set_mem_tag_range() and mte_zero_clear_page_tags() use
DC {GVA,GZVA} unconditionally. But, they should make sure that
DCZID_EL0.DZP, which indicates whether or not use of those instructions
is prohibited, is zero when using those instructions.
Use ST{G,ZG,Z2G} instead when DCZID_EL0.DZP == 1.
Fixes: 013bb59dbb7c ("arm64: mte: handle tags zeroing at page allocation time")
Fixes: 3d0cca0b02ac ("kasan: speed up mte_set_mem_tag_range")
Signed-off-by: Reiji Watanabe <reijiw@google.com>
Link: https://lore.kernel.org/r/20211206004736.1520989-3-reijiw@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions