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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::1030; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1030.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-arm@nongnu.org, Stephen Long Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" Using mprotect() to change PROT_* does not change the MAP_ANON previously set with mmap(). Our linux-user version of MTE only works with MAP_ANON pages, so losing PAGE_ANON caused MTE to stop working. Reported-by: Stephen Long Signed-off-by: Richard Henderson Reviewed-by: Alex Benn=C3=A9e Tested-by: Alex Benn=C3=A9e --- tests/tcg/aarch64/mte.h | 3 ++- accel/tcg/translate-all.c | 9 +++++-- tests/tcg/aarch64/mte-6.c | 43 +++++++++++++++++++++++++++++++ tests/tcg/aarch64/Makefile.target | 2 +- 4 files changed, 53 insertions(+), 4 deletions(-) create mode 100644 tests/tcg/aarch64/mte-6.c diff --git a/tests/tcg/aarch64/mte.h b/tests/tcg/aarch64/mte.h index 141cef522c..0805676b11 100644 --- a/tests/tcg/aarch64/mte.h +++ b/tests/tcg/aarch64/mte.h @@ -48,7 +48,8 @@ static void enable_mte(int tcf) } } =20 -static void *alloc_mte_mem(size_t size) +static void * alloc_mte_mem(size_t size) __attribute__((unused)); +static void * alloc_mte_mem(size_t size) { void *p =3D mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_MTE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index f32df8b240..ba6ab09790 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -2714,6 +2714,8 @@ void page_set_flags(target_ulong start, target_ulong = end, int flags) a missing call to h2g_valid. */ assert(end - 1 <=3D GUEST_ADDR_MAX); assert(start < end); + /* Only set PAGE_ANON with new mappings. */ + assert(!(flags & PAGE_ANON) || (flags & PAGE_RESET)); assert_memory_lock(); =20 start =3D start & TARGET_PAGE_MASK; @@ -2737,11 +2739,14 @@ void page_set_flags(target_ulong start, target_ulon= g end, int flags) p->first_tb) { tb_invalidate_phys_page(addr, 0); } - if (reset_target_data && p->target_data) { + if (reset_target_data) { g_free(p->target_data); p->target_data =3D NULL; + p->flags =3D flags; + } else { + /* Using mprotect on a page does not change MAP_ANON. */ + p->flags =3D (p->flags & PAGE_ANON) | flags; } - p->flags =3D flags; } } =20 diff --git a/tests/tcg/aarch64/mte-6.c b/tests/tcg/aarch64/mte-6.c new file mode 100644 index 0000000000..60d51d18be --- /dev/null +++ b/tests/tcg/aarch64/mte-6.c @@ -0,0 +1,43 @@ +#include "mte.h" + +void pass(int sig, siginfo_t *info, void *uc) +{ + assert(info->si_code =3D=3D SEGV_MTESERR); + exit(0); +} + +int main(void) +{ + enable_mte(PR_MTE_TCF_SYNC); + + void *brk =3D sbrk(16); + if (brk =3D=3D (void *)-1) { + perror("sbrk"); + return 2; + } + + if (mprotect(brk, 16, PROT_READ | PROT_WRITE | PROT_MTE)) { + perror("mprotect"); + return 2; + } + + int *p1, *p2; + long excl =3D 1; + + asm("irg %0,%1,%2" : "=3Dr"(p1) : "r"(brk), "r"(excl)); + asm("gmi %0,%1,%0" : "+r"(excl) : "r"(p1)); + asm("irg %0,%1,%2" : "=3Dr"(p2) : "r"(brk), "r"(excl)); + asm("stg %0,[%0]" : : "r"(p1)); + + *p1 =3D 0; + + struct sigaction sa; + memset(&sa, 0, sizeof(sa)); + sa.sa_sigaction =3D pass; + sa.sa_flags =3D SA_SIGINFO; + sigaction(SIGSEGV, &sa, NULL); + + *p2 =3D 0; + + abort(); +} diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile= .target index 56e48f4b34..05b2622bfc 100644 --- a/tests/tcg/aarch64/Makefile.target +++ b/tests/tcg/aarch64/Makefile.target @@ -37,7 +37,7 @@ AARCH64_TESTS +=3D bti-2 =20 # MTE Tests ifneq ($(DOCKER_IMAGE)$(CROSS_CC_HAS_ARMV8_MTE),) -AARCH64_TESTS +=3D mte-1 mte-2 mte-3 mte-4 +AARCH64_TESTS +=3D mte-1 mte-2 mte-3 mte-4 mte-6 mte-%: CFLAGS +=3D -march=3Darmv8.5-a+memtag endif =20 --=20 2.25.1