selftests, arm64: add a selftest for passing tagged pointers to kernel

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This patch is a part of a series that extends kernel ABI to allow to pass
tagged user pointers (with the top byte set to something else other than
0x00) as syscall arguments.

This patch adds a simple test, that calls the uname syscall with a
tagged user pointer as an argument. Without the kernel accepting tagged
user pointers the test fails with EFAULT.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Andrey Konovalov 2019-07-23 19:58:52 +02:00 • committed by Will Deacon

parent 63f0c60379

commit 9ce1263033

4 changed files with 53 additions and 0 deletions

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tools/testing/selftests/arm64/.gitignore vendored

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tools/testing/selftests/arm64/Makefile

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tools/testing/selftests/arm64/run_tags_test.sh Executable file

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tools/testing/selftests/arm64/tags_test.c

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