Re: [PATCH v18 15/15] selftests, arm64: add a selftest for passing tagged pointers to kernel
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2019-06-24 17:38:16
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amd-gfx, dri-devel, kvm, linux-kselftest, linux-media, linux-mm, linux-rdma, lkml
On Mon, Jun 24, 2019 at 04:33:00PM +0200, Andrey Konovalov wrote:
quoted hunk ↗ jump to hunk
--- /dev/null +++ b/tools/testing/selftests/arm64/tags_test.c@@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <stdint.h> +#include <sys/prctl.h> +#include <sys/utsname.h> + +#define SHIFT_TAG(tag) ((uint64_t)(tag) << 56) +#define SET_TAG(ptr, tag) (((uint64_t)(ptr) & ~SHIFT_TAG(0xff)) | \ + SHIFT_TAG(tag)) + +int main(void) +{ + static int tbi_enabled = 0; + struct utsname *ptr, *tagged_ptr; + int err; + + if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0) + tbi_enabled = 1;
Nitpick: with the latest prctl() patch, you can skip the last three arguments as they are ignored. Either way: Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel