From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 02172CC6B34 for ; Thu, 15 Oct 2026 11:22:40 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1xHJXQ-000592-5U; Thu, 15 Oct 2026 07:22:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xHJXM-0004sn-Uk for qemu-devel@nongnu.org; Thu, 15 Oct 2026 07:22:17 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xHJXK-0004BQ-Q3 for qemu-devel@nongnu.org; Thu, 15 Oct 2026 07:22:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1792063334; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d0V+1Yt9bM+H+erMJRFKkFIUv64UmwFBKlWbudq0rME=; b=gDgrkQS1uMU3t1oSNpZhk9GZ45TDEzkW+N9tjYWm9MRPqIZir1vDD/SY9HF/OH7Bsre4NZ 5DTKndG1GvxEfJFE4ebDP1bqK9/DO/nHSCUPda9BVq1dBv6LPalP6bl4urzUqiOcvA/K2S AlGI6IX4EtRQ9TtwLFRJpJiPet9MSms= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-223-KeOFUiyfMz-5cIQtDWHduQ-1; Thu, 15 Oct 2026 11:22:10 +0000 X-MC-Unique: KeOFUiyfMz-5cIQtDWHduQ-1 X-Mimecast-MFC-AGG-ID: KeOFUiyfMz-5cIQtDWHduQ_1792063329 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 22AE91800BC6; Thu, 15 Oct 2026 11:22:09 +0000 (UTC) Received: from berrange.csb (headnet04.pony-001.prod.iad2.dc.redhat.com [10.2.32.116]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id BEE051800257; Thu, 15 Oct 2026 11:22:05 +0000 (UTC) From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Michael Roth , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Fabiano Rosas , Richard Henderson , "Dr. David Alan Gilbert" , Paolo Bonzini , Markus Armbruster , Pierrick Bouvier , Eric Blake , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Laurent Vivier Subject: [PATCH 20/21] qtest: add 'crash' command to generate 'authentic' process crashes Date: Thu, 15 Oct 2026 12:20:43 +0100 Message-ID: <20261015112044.1999748-21-berrange@redhat.com> In-Reply-To: <20261015112044.1999748-1-berrange@redhat.com> References: <20261015112044.1999748-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.24, 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_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The 'crash' command provides a mechanism to generate process crashes, which serve to test the signal catching and handling facilities in a more authentic manner than simply running 'raise(SIG..)' against ourself. Available usage is crash null-pointer -> SIGSEGV on null pointer crash invalid-addr -> SIGSEGV on derefence invalid address crash mapping-not-backed -> SIGBUS on writing to map with no storage crash bad-alignment -> SIGBUS on unaligned data write crash fpe-div-zero -> SIGFPE on floating point divide by zero crash assert -> SIGABRT on assertion failure crash illegal-inst -> SIGILL on illegal instruction Signed-off-by: Daniel P. Berrangé --- system/qtest.c | 50 ++++++++++++++++++++++++++++++++++++++++++ tests/qtest/libqtest.c | 26 ++++++++++++++++++++++ tests/qtest/libqtest.h | 16 ++++++++++++++ 3 files changed, 92 insertions(+) diff --git a/system/qtest.c b/system/qtest.c index 47c954838dd..0ff04cf24e8 100644 --- a/system/qtest.c +++ b/system/qtest.c @@ -811,6 +811,56 @@ static void qtest_process_command(CharFrontend *chr, gchar **words) qtest_sendf(chr, err ? "FAIL %s\n" : "OK\n", err ? error_get_pretty(err) : NULL); error_free(err); + } else if (strcmp(words[0], "crash") == 0) { + if (strcmp(words[1], "null-pointer") == 0) { + char *c = (void *)0x0; + *c = 'a'; /* SIGSEGV */ + } else if (strcmp(words[1], "invalid-addr") == 0) { + /* Hopefully invalid addr on all supported targets */ + char *c = (void *)0x12345; + *c = 'b'; /* SIGSEGV */ +#ifndef WIN32 + } else if (strcmp(words[1], "mapping-not-backed") == 0) { + char *m; + g_autofree char *tmpname = NULL; + int tmpfd = g_file_open_tmp("qtestcrash-XXXXXX", &tmpname, NULL); + m = (char *)mmap(0, 4, PROT_WRITE, MAP_PRIVATE, tmpfd, 0); + unlink(tmpname); + assert(m != MAP_FAILED); + /* + * Since no writes have been made to 'tmpfd', the backing + * store is still zero-length, and thus writes should + * trigger a bus error + */ + m[0] = 0; /* SIGBUS */ +#if defined(__x86_64__) || defined(__aarch64__) + } else if (strcmp(words[1], "bad-alignment") == 0) { + /* + * XXX: can we assume any other arches will generate + * bus errors on unaligned writes ? + */ + char *cptr = g_malloc(sizeof(int) + 1) + 1; + int *iptr = (int *)cptr; +#ifdef __x86_64__ + /* Turn on alignment checks */ + __asm__("pushf\norl $0x40000,(%rsp)\npopf"); +#endif + *iptr = 42; /* SIGBUS */ +#endif +#endif + } else if (strcmp(words[1], "fpe-div-zero") == 0) { + volatile int foo = 1729; /* volatile to stop optimizing */ + volatile int bar = 0; /* volatile to stop optimizing */ + + foo = foo / bar; /* SIGFPE */ + (void)foo; + } else if (strcmp(words[1], "assert") == 0) { + assert(1 == 2); /* SIGABRT */ + } else if (strcmp(words[1], "illegal-inst") == 0) { + __builtin_trap(); /* SIGILL */ + } else { + qtest_sendf(chr, "FAIL unsupported crash action '%s'", words[1]); + } } else if (process_command_cb && process_command_cb(chr, words)) { /* Command got consumed by the callback handler */ } else { diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c index e65451171e4..d6ca97b1c11 100644 --- a/tests/qtest/libqtest.c +++ b/tests/qtest/libqtest.c @@ -828,6 +828,32 @@ static int qtest_query_target_endianness(QTestState *s) return big_endian; } +static const char *crashtypestr[] = { + "null-pointer", + "invalid-addr", + "mapping-not-backed", +#if defined(__x86_64__) || defined(__aarch64__) + "bad-alignment", +#endif + "fpe-div-zero", + "assert", + "illegal-inst", +}; +G_STATIC_ASSERT(G_N_ELEMENTS(crashtypestr) == QTEST_CRASH__MAX); + +void qtest_crash(QTestState *s, QTestCrashType type) +{ + char buf[1024]; + ssize_t len; + assert(type < QTEST_CRASH__MAX); + qtest_sendf(s, "crash %s\n", crashtypestr[type]); + len = recv(s->fd, buf, sizeof(buf), 0); + if (len != 0) { + g_printerr("Expected crash from QEMU but saw qtest reply"); + abort(); + } +} + QDict *qtest_qmp_receive(QTestState *s) { while (true) { diff --git a/tests/qtest/libqtest.h b/tests/qtest/libqtest.h index ddcf075e33a..4988e627592 100644 --- a/tests/qtest/libqtest.h +++ b/tests/qtest/libqtest.h @@ -1232,4 +1232,20 @@ bool mkimg(const char *file, const char *fmt, unsigned size_mb); */ bool qtest_verbose(const char *domain); +typedef enum { + QTEST_CRASH_NULL_POINTER, + QTEST_CRASH_INVALID_ADDR, + QTEST_CRASH_MAPPING_NOT_BACKED, +#if defined(__x86_64__) || defined(__aarch64__) + QTEST_CRASH_BAD_ALIGNMENT, +#endif + QTEST_CRASH_FPE_DIV_ZERO, + QTEST_CRASH_ASSERT, + QTEST_CRASH_ILLEGAL_INST, + + QTEST_CRASH__MAX, +} QTestCrashType; + +void qtest_crash(QTestState *s, QTestCrashType type); + #endif -- 2.56.0