From nobody Sun Feb 8 14:31:29 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4C69C2820C7; Wed, 18 Jun 2025 08:45:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750236332; cv=none; b=g78giDvGVOGRaMLVCCufEgNZT+yj99df5aEF2dfKMPT8J5BVI227nc2frlPTUfmctx9kubySHdHfSKN1f8A1vLjWc+dNgm4UtnGO25/r8jAiPjA6l9jXtEvluOKlIl4kj10TzY3MqRvqEdIpEGxMCodJ6Lz2T+Owm8hNIj9jaCg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750236332; c=relaxed/simple; bh=2k+/Ki0NTtqVgGnbH15IcLWubCSrgd5KKXBaHhocAUg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=IiyyyMxpUxRVLl0N1+7zsSsfKJlcnA3UhAl4an3Ej/t4AOYrQuAdw9c1cib1DVocl6+2ah6UGvpXE5wWK4CpyjtSTbIY/CHClcEN2rPmm4NihGsDOMcTg+GPUpqxO8xmhxoJ4WXomxTo98iZw8QjC7a69mZZDMXBfCleuOaKo/g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1601C14BF; Wed, 18 Jun 2025 01:45:10 -0700 (PDT) Received: from e129823.cambridge.arm.com (e129823.arm.com [10.1.197.6]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 708403F66E; Wed, 18 Jun 2025 01:45:28 -0700 (PDT) From: Yeoreum Yun To: catalin.marinas@arm.com, pcc@google.com, will@kernel.org, broonie@kernel.org, anshuman.khandual@arm.com, joey.gouly@arm.com, yury.khrustalev@arm.com, maz@kernel.org, oliver.upton@linux.dev, frederic@kernel.org, akpm@linux-foundation.org, surenb@google.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Yeoreum Yun Subject: [PATCH v9 05/10] kselftest/arm64/mte: register mte signal handler with SA_EXPOSE_TAGBITS Date: Wed, 18 Jun 2025 09:45:08 +0100 Message-Id: <20250618084513.1761345-6-yeoreum.yun@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250618084513.1761345-1-yeoreum.yun@arm.com> References: <20250618084513.1761345-1-yeoreum.yun@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" To test address tag[63:60] and memory tag[59:56] is preserved when memory tag fault happen, Let mte_register_signal() to register signal handler with SA_EXPOSE_TAGBITS. Signed-off-by: Yeoreum Yun Reviewed-by: Mark Brown --- tools/testing/selftests/arm64/mte/check_buffer_fill.c | 2 +- .../testing/selftests/arm64/mte/check_child_memory.c | 4 ++-- .../selftests/arm64/mte/check_hugetlb_options.c | 4 ++-- tools/testing/selftests/arm64/mte/check_ksm_options.c | 4 ++-- .../testing/selftests/arm64/mte/check_mmap_options.c | 4 ++-- .../selftests/arm64/mte/check_tags_inclusion.c | 2 +- tools/testing/selftests/arm64/mte/check_user_mem.c | 2 +- tools/testing/selftests/arm64/mte/mte_common_util.c | 11 ++++++++++- tools/testing/selftests/arm64/mte/mte_common_util.h | 3 ++- 9 files changed, 23 insertions(+), 13 deletions(-) diff --git a/tools/testing/selftests/arm64/mte/check_buffer_fill.c b/tools/= testing/selftests/arm64/mte/check_buffer_fill.c index 2ee7f114d7fa..5248b5265aa4 100644 --- a/tools/testing/selftests/arm64/mte/check_buffer_fill.c +++ b/tools/testing/selftests/arm64/mte/check_buffer_fill.c @@ -415,7 +415,7 @@ int main(int argc, char *argv[]) return err; =20 /* Register SIGSEGV handler */ - mte_register_signal(SIGSEGV, mte_default_handler); + mte_register_signal(SIGSEGV, mte_default_handler, false); =20 /* Set test plan */ ksft_set_plan(20); diff --git a/tools/testing/selftests/arm64/mte/check_child_memory.c b/tools= /testing/selftests/arm64/mte/check_child_memory.c index 7597fc632cad..b97ea3981c21 100644 --- a/tools/testing/selftests/arm64/mte/check_child_memory.c +++ b/tools/testing/selftests/arm64/mte/check_child_memory.c @@ -160,8 +160,8 @@ int main(int argc, char *argv[]) return err; =20 /* Register SIGSEGV handler */ - mte_register_signal(SIGSEGV, mte_default_handler); - mte_register_signal(SIGBUS, mte_default_handler); + mte_register_signal(SIGSEGV, mte_default_handler, false); + mte_register_signal(SIGBUS, mte_default_handler, false); =20 /* Set test plan */ ksft_set_plan(12); diff --git a/tools/testing/selftests/arm64/mte/check_hugetlb_options.c b/to= ols/testing/selftests/arm64/mte/check_hugetlb_options.c index 3bfcd3848432..4e644a606394 100644 --- a/tools/testing/selftests/arm64/mte/check_hugetlb_options.c +++ b/tools/testing/selftests/arm64/mte/check_hugetlb_options.c @@ -235,8 +235,8 @@ int main(int argc, char *argv[]) return err; =20 /* Register signal handlers */ - mte_register_signal(SIGBUS, mte_default_handler); - mte_register_signal(SIGSEGV, mte_default_handler); + mte_register_signal(SIGBUS, mte_default_handler, false); + mte_register_signal(SIGSEGV, mte_default_handler, false); =20 allocate_hugetlb(); =20 diff --git a/tools/testing/selftests/arm64/mte/check_ksm_options.c b/tools/= testing/selftests/arm64/mte/check_ksm_options.c index 88c74bc46d4f..afea4e381862 100644 --- a/tools/testing/selftests/arm64/mte/check_ksm_options.c +++ b/tools/testing/selftests/arm64/mte/check_ksm_options.c @@ -141,8 +141,8 @@ int main(int argc, char *argv[]) return KSFT_FAIL; } /* Register signal handlers */ - mte_register_signal(SIGBUS, mte_default_handler); - mte_register_signal(SIGSEGV, mte_default_handler); + mte_register_signal(SIGBUS, mte_default_handler, false); + mte_register_signal(SIGSEGV, mte_default_handler, false); =20 /* Set test plan */ ksft_set_plan(4); diff --git a/tools/testing/selftests/arm64/mte/check_mmap_options.c b/tools= /testing/selftests/arm64/mte/check_mmap_options.c index 17694caaff53..b37bf481c9f9 100644 --- a/tools/testing/selftests/arm64/mte/check_mmap_options.c +++ b/tools/testing/selftests/arm64/mte/check_mmap_options.c @@ -201,8 +201,8 @@ int main(int argc, char *argv[]) sizes[item - 1] =3D page_size + 1; =20 /* Register signal handlers */ - mte_register_signal(SIGBUS, mte_default_handler); - mte_register_signal(SIGSEGV, mte_default_handler); + mte_register_signal(SIGBUS, mte_default_handler, false); + mte_register_signal(SIGSEGV, mte_default_handler, false); =20 /* Set test plan */ ksft_set_plan(22); diff --git a/tools/testing/selftests/arm64/mte/check_tags_inclusion.c b/too= ls/testing/selftests/arm64/mte/check_tags_inclusion.c index a3d1e23fe02a..b96296ab9870 100644 --- a/tools/testing/selftests/arm64/mte/check_tags_inclusion.c +++ b/tools/testing/selftests/arm64/mte/check_tags_inclusion.c @@ -180,7 +180,7 @@ int main(int argc, char *argv[]) return err; =20 /* Register SIGSEGV handler */ - mte_register_signal(SIGSEGV, mte_default_handler); + mte_register_signal(SIGSEGV, mte_default_handler, false); =20 /* Set test plan */ ksft_set_plan(4); diff --git a/tools/testing/selftests/arm64/mte/check_user_mem.c b/tools/tes= ting/selftests/arm64/mte/check_user_mem.c index f4ae5f87a3b7..d1d14aaaba16 100644 --- a/tools/testing/selftests/arm64/mte/check_user_mem.c +++ b/tools/testing/selftests/arm64/mte/check_user_mem.c @@ -211,7 +211,7 @@ int main(int argc, char *argv[]) return err; =20 /* Register signal handlers */ - mte_register_signal(SIGSEGV, mte_default_handler); + mte_register_signal(SIGSEGV, mte_default_handler, false); =20 /* Set test plan */ ksft_set_plan(64); diff --git a/tools/testing/selftests/arm64/mte/mte_common_util.c b/tools/te= sting/selftests/arm64/mte/mte_common_util.c index a1dc2fe5285b..83240b980f9c 100644 --- a/tools/testing/selftests/arm64/mte/mte_common_util.c +++ b/tools/testing/selftests/arm64/mte/mte_common_util.c @@ -19,6 +19,10 @@ #include "mte_common_util.h" #include "mte_def.h" =20 +#ifndef SA_EXPOSE_TAGBITS +#define SA_EXPOSE_TAGBITS 0x00000800 +#endif + #define INIT_BUFFER_SIZE 256 =20 struct mte_fault_cxt cur_mte_cxt; @@ -79,12 +83,17 @@ void mte_default_handler(int signum, siginfo_t *si, voi= d *uc) } } =20 -void mte_register_signal(int signal, void (*handler)(int, siginfo_t *, voi= d *)) +void mte_register_signal(int signal, void (*handler)(int, siginfo_t *, voi= d *), + bool export_tags) { struct sigaction sa; =20 sa.sa_sigaction =3D handler; sa.sa_flags =3D SA_SIGINFO; + + if (export_tags && signal =3D=3D SIGSEGV) + sa.sa_flags |=3D SA_EXPOSE_TAGBITS; + sigemptyset(&sa.sa_mask); sigaction(signal, &sa, NULL); } diff --git a/tools/testing/selftests/arm64/mte/mte_common_util.h b/tools/te= sting/selftests/arm64/mte/mte_common_util.h index a0017a303beb..6b109e84fa39 100644 --- a/tools/testing/selftests/arm64/mte/mte_common_util.h +++ b/tools/testing/selftests/arm64/mte/mte_common_util.h @@ -40,7 +40,8 @@ extern struct mte_fault_cxt cur_mte_cxt; =20 /* MTE utility functions */ void mte_default_handler(int signum, siginfo_t *si, void *uc); -void mte_register_signal(int signal, void (*handler)(int, siginfo_t *, voi= d *)); +void mte_register_signal(int signal, void (*handler)(int, siginfo_t *, voi= d *), + bool export_tags); void mte_wait_after_trig(void); void *mte_allocate_memory(size_t size, int mem_type, int mapping, bool tag= s); void *mte_allocate_memory_tag_range(size_t size, int mem_type, int mapping, --=20 LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}