selftests, arm64: add a selftest for passing tagged pointers to kernel
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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tools/testing/selftests/arm64/.gitignore
vendored
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tools/testing/selftests/arm64/.gitignore
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tags_test
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tools/testing/selftests/arm64/Makefile
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tools/testing/selftests/arm64/Makefile
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# SPDX-License-Identifier: GPL-2.0
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# ARCH can be overridden by the user for cross compiling
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ARCH ?= $(shell uname -m 2>/dev/null || echo not)
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ifneq (,$(filter $(ARCH),aarch64 arm64))
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TEST_GEN_PROGS := tags_test
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TEST_PROGS := run_tags_test.sh
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endif
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include ../lib.mk
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tools/testing/selftests/arm64/run_tags_test.sh
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tools/testing/selftests/arm64/run_tags_test.sh
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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echo "--------------------"
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echo "running tags test"
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echo "--------------------"
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./tags_test
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if [ $? -ne 0 ]; then
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echo "[FAIL]"
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else
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echo "[PASS]"
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fi
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tools/testing/selftests/arm64/tags_test.c
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tools/testing/selftests/arm64/tags_test.c
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// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <sys/prctl.h>
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#include <sys/utsname.h>
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#define SHIFT_TAG(tag) ((uint64_t)(tag) << 56)
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#define SET_TAG(ptr, tag) (((uint64_t)(ptr) & ~SHIFT_TAG(0xff)) | \
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SHIFT_TAG(tag))
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int main(void)
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{
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static int tbi_enabled = 0;
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struct utsname *ptr, *tagged_ptr;
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int err;
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if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0)
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tbi_enabled = 1;
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ptr = (struct utsname *)malloc(sizeof(*ptr));
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if (tbi_enabled)
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tagged_ptr = (struct utsname *)SET_TAG(ptr, 0x42);
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err = uname(tagged_ptr);
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free(ptr);
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return err;
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}
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