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Mon, 09 Mar 2026 15:00:55 -0700 (PDT) From: Gabriel Brookman Date: Mon, 09 Mar 2026 17:59:45 -0400 Subject: [PATCH v4 13/13] tests/tcg: add test for MTE_STORE_ONLY MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260309-feat-mte4-v4-13-daaf0375620d@gmail.com> References: <20260309-feat-mte4-v4-0-daaf0375620d@gmail.com> In-Reply-To: <20260309-feat-mte4-v4-0-daaf0375620d@gmail.com> To: qemu-devel@nongnu.org Cc: Peter Maydell , Gustavo Romero , Richard Henderson , qemu-arm@nongnu.org, Laurent Vivier , Pierrick Bouvier , Gabriel Brookman X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1773093641; l=2991; i=brookmangabriel@gmail.com; s=20251009; h=from:subject:message-id; bh=BR2qvqK3g1qrJmisJ+SFI6LAMFWBhUqYUn2heQVrBI8=; b=STvzJdu25MkIR4UqGyc+cKtDJk+xVOeuYof3CSz/AxmgCOC6/rsNMs/bUByxcBAVdTxxgQ6vq O1jVnvR8rubD0LMJcOURPSHuEuW9DjrLiCgYOTW9rv9bJzGEdvG+N3z X-Developer-Key: i=brookmangabriel@gmail.com; a=ed25519; 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Signed-off-by: Gabriel Brookman Reviewed-by: Richard Henderson --- tests/tcg/aarch64/Makefile.target | 2 +- tests/tcg/aarch64/mte-10.c | 49 +++++++++++++++++++++++++++++++++++= ++++ tests/tcg/aarch64/mte.h | 4 ++-- 3 files changed, 52 insertions(+), 3 deletions(-) diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile= .target index b491cfb5e1..6203ac9b51 100644 --- a/tests/tcg/aarch64/Makefile.target +++ b/tests/tcg/aarch64/Makefile.target @@ -64,7 +64,7 @@ AARCH64_TESTS +=3D bti-2 =20 # MTE Tests ifneq ($(CROSS_CC_HAS_ARMV8_MTE),) -AARCH64_TESTS +=3D mte-1 mte-2 mte-3 mte-4 mte-5 mte-6 mte-7 mte-8 mte-9 +AARCH64_TESTS +=3D mte-1 mte-2 mte-3 mte-4 mte-5 mte-6 mte-7 mte-8 mte-9 m= te-10 mte-%: CFLAGS +=3D $(CROSS_CC_HAS_ARMV8_MTE) endif =20 diff --git a/tests/tcg/aarch64/mte-10.c b/tests/tcg/aarch64/mte-10.c new file mode 100644 index 0000000000..46d26fe97f --- /dev/null +++ b/tests/tcg/aarch64/mte-10.c @@ -0,0 +1,49 @@ +/* + * Memory tagging, write-only tag checking + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "mte.h" + +void pass(int sig, siginfo_t *info, void *uc) +{ + exit(0); +} + +int main(int ac, char **av) +{ + struct sigaction sa; + int *p0, *p1, *p2; + long excl =3D 1; + + enable_mte(PR_MTE_TCF_SYNC | PR_MTE_STORE_ONLY); + p0 =3D alloc_mte_mem(sizeof(*p0)); + + /* Create two differently tagged pointers. */ + asm("irg %0,%1,%2" : "=3Dr"(p1) : "r"(p0), "r"(excl)); + asm("gmi %0,%1,%0" : "+r"(excl) : "r" (p1)); + assert(excl !=3D 1); + asm("irg %0,%1,%2" : "=3Dr"(p2) : "r"(p0), "r"(excl)); + assert(p1 !=3D p2); + + /* Store the tag from the first pointer. */ + asm("stg %0, [%0]" : : "r"(p1)); + + /* + * We write to p1 (stg above makes this check pass) and read from + * p2 (improperly tagged, but since it's a read, we don't care). + */ + *p1 =3D *p2; + + /* enable handler */ + memset(&sa, 0, sizeof(sa)); + sa.sa_sigaction =3D pass; + sa.sa_flags =3D SA_SIGINFO; + sigaction(SIGSEGV, &sa, NULL); + + /* now we write to badly tagged p2, should fault. */ + *p2 =3D 0; + + abort(); +} diff --git a/tests/tcg/aarch64/mte.h b/tests/tcg/aarch64/mte.h index 17b932f3f1..7093b93dc7 100644 --- a/tests/tcg/aarch64/mte.h +++ b/tests/tcg/aarch64/mte.h @@ -40,10 +40,10 @@ # define SEGV_MTESERR 9 #endif =20 -static void enable_mte(int tcf) +static void enable_mte(int flags) { int r =3D prctl(PR_SET_TAGGED_ADDR_CTRL, - PR_TAGGED_ADDR_ENABLE | tcf | (0xfffe << PR_MTE_TAG_SHIF= T), + PR_TAGGED_ADDR_ENABLE | flags | (0xfffe << PR_MTE_TAG_SH= IFT), 0, 0, 0); if (r < 0) { perror("PR_SET_TAGGED_ADDR_CTRL"); --=20 2.52.0