kselftest/arm64: Check mte tagged user address in kernel

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Add a testcase to check that user address with valid/invalid
mte tag works in kernel mode. This test verifies that the kernel
API's __arch_copy_from_user/__arch_copy_to_user works by considering
if the user pointer has valid/invalid allocation tags.

In MTE sync mode, file memory read/write and other similar interfaces
fails if a user memory with invalid tag is accessed in kernel. In async
mode no such failure occurs.

Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201002115630.24683-7-amit.kachhap@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

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Amit Daniel Kachhap 2020-10-02 17:26:30 +05:30 • committed by Will Deacon

parent f981d8fa26

commit 4dafc08d0b

4 changed files with 127 additions and 0 deletions

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1

tools/testing/selftests/arm64/mte/.gitignore vendored

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111

tools/testing/selftests/arm64/mte/check_user_mem.c

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1

tools/testing/selftests/arm64/mte/mte_common_util.h

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14

tools/testing/selftests/arm64/mte/mte_helper.S

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