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| author |   Amit Daniel Kachhap <amit.kachhap@arm.com> | 2020-10-02 17:26:30 +0530 |
|---|---|---|
| committer |   Will Deacon <will@kernel.org> | 2020-10-05 18:52:17 +0100 |
| commit | 4dafc08d0ba4768e8540f49ab40c3ea26e40d554 (patch) | |
| tree | abd3c2e5031537bd67107a13d31e129546a39fab /tools/testing/selftests/arm64/mte/mte_helper.S | |
| parent | kselftest/arm64: Verify KSM page merge for MTE pages (diff) | |
| download | wireguard-linux-4dafc08d0ba4768e8540f49ab40c3ea26e40d554.tar.xz wireguard-linux-4dafc08d0ba4768e8540f49ab40c3ea26e40d554.zip | |
kselftest/arm64: Check mte tagged user address in kernel
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>
Diffstat (limited to '')
| -rw-r--r-- | tools/testing/selftests/arm64/mte/mte_helper.S | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/mte/mte_helper.S b/tools/testing/selftests/arm64/mte/mte_helper.S index 48e049fbad9a..a02c04cd0aac 100644 --- a/tools/testing/selftests/arm64/mte/mte_helper.S +++ b/tools/testing/selftests/arm64/mte/mte_helper.S @@ -27,6 +27,20 @@ ENTRY(mte_insert_random_tag) ENDPROC(mte_insert_random_tag) /* + * mte_insert_new_tag: Insert new tag and different from the source tag if + * source pointer has it. + * Input: + * x0 - source pointer with a tag/no-tag + * Return: + * x0 - pointer with random tag + */ +ENTRY(mte_insert_new_tag) + gmi x1, x0, xzr + irg x0, x0, x1 + ret +ENDPROC(mte_insert_new_tag) + +/* * mte_get_tag_address: Get the tag from given address. * Input: * x0 - source pointer |