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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.236.115; envelope-from=alxndr@bu.edu; helo=NAM11-BN8-obe.outbound.protection.outlook.com X-Spam_score_int: 1 X-Spam_score: 0.1 X-Spam_bar: / X-Spam_report: (0.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HK_RANDOM_ENVFROM=0.999, HK_RANDOM_FROM=0.999, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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: Laurent Vivier , Thomas Huth , f4bug@amsat.org, Alexander Bulekov , Bandan Das , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" Using a custom timeout is useful to continue fuzzing complex devices, even after we run into some slow code-path. However, simply adding a fixed timeout to each input effectively caps the maximum input length/number of operations at some artificial value. There are two major problems with this: 1. Some code might only be reachable through long IO sequences. 2. Longer inputs can actually be _better_ for performance. While the raw number of fuzzer executions decreases with larger inputs, the number of MMIO/PIO/DMA operation/second actually increases, since were are speding proportionately less time fork()ing. With this change, we keep the custom-timeout, but we renew it, prior to each MMIO/PIO/DMA operation. Thus, we time-out only when a particaly operation takes a long time. Signed-off-by: Alexander Bulekov --- tests/qtest/fuzz/generic_fuzz.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuz= z.c index cea7d4058e..71d36e8f6f 100644 --- a/tests/qtest/fuzz/generic_fuzz.c +++ b/tests/qtest/fuzz/generic_fuzz.c @@ -661,15 +661,16 @@ static void generic_fuzz(QTestState *s, const unsigne= d char *Data, size_t Size) uint8_t op; =20 if (fork() =3D=3D 0) { + struct sigaction sact; + struct itimerval timer; /* * Sometimes the fuzzer will find inputs that take quite a long ti= me to * process. Often times, these inputs do not result in new coverag= e. * Even if these inputs might be interesting, they can slow down t= he - * fuzzer, overall. Set a timeout to avoid hurting performance, to= o much + * fuzzer, overall. Set a timeout for each command to avoid hurting + * performance, too much */ if (timeout) { - struct sigaction sact; - struct itimerval timer; =20 sigemptyset(&sact.sa_mask); sact.sa_flags =3D SA_NODEFER; @@ -679,13 +680,17 @@ static void generic_fuzz(QTestState *s, const unsigne= d char *Data, size_t Size) memset(&timer, 0, sizeof(timer)); timer.it_value.tv_sec =3D timeout / USEC_IN_SEC; timer.it_value.tv_usec =3D timeout % USEC_IN_SEC; - setitimer(ITIMER_VIRTUAL, &timer, NULL); } =20 op_clear_dma_patterns(s, NULL, 0); pci_disabled =3D false; =20 while (cmd && Size) { + /* Reset the timeout, each time we run a new command */ + if (timeout) { + setitimer(ITIMER_VIRTUAL, &timer, NULL); + } + /* Get the length until the next command or end of input */ nextcmd =3D memmem(cmd, Size, SEPARATOR, strlen(SEPARATOR)); cmd_len =3D nextcmd ? nextcmd - cmd : Size; --=20 2.28.0 From nobody Thu May 2 00:02:52 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.236.115; envelope-from=alxndr@bu.edu; helo=NAM11-BN8-obe.outbound.protection.outlook.com X-Spam_score_int: 1 X-Spam_score: 0.1 X-Spam_bar: / X-Spam_report: (0.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HK_RANDOM_ENVFROM=0.999, HK_RANDOM_FROM=0.999, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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: Thomas Huth , f4bug@amsat.org, Alexander Bulekov , Bandan Das , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bushare.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" By default, -fsanitize=3Dfuzzer instruments all code with coverage information. However, this means that libfuzzer will track coverage over hundreds of source files that are unrelated to virtual-devices. This means that libfuzzer will optimize inputs for coverage observed in timer code, memory APIs etc. This slows down the fuzzer and stores many inputs that are not relevant to the actual virtual-devices. With this change, clang will only instrument a subset of the compiled code, that is directly related to virtual-devices. Signed-off-by: Alexander Bulekov --- configure | 4 ++++ scripts/oss-fuzz/instrumentation-filter | 14 ++++++++++++++ 2 files changed, 18 insertions(+) create mode 100644 scripts/oss-fuzz/instrumentation-filter diff --git a/configure b/configure index debd50c085..40412bcfcf 100755 --- a/configure +++ b/configure @@ -6089,6 +6089,10 @@ if test "$fuzzing" =3D "yes" ; then # If LIB_FUZZING_ENGINE is set, assume we are running on OSS-Fuzz, and t= he # needed CFLAGS have already been provided if test -z "${LIB_FUZZING_ENGINE+xxx}" ; then + # Specify a filter to only instrument code that is directly related to + # virtual-devices. + QEMU_CFLAGS=3D"$QEMU_CFLAGS -fsanitize-coverage-allowlist=3D$source_path/= scripts/oss-fuzz/instrumentation-filter" + # Add CFLAGS to tell clang to add fuzzer-related instrumentation to al= l the # compiled code. QEMU_CFLAGS=3D"$QEMU_CFLAGS -fsanitize=3Dfuzzer-no-link" diff --git a/scripts/oss-fuzz/instrumentation-filter b/scripts/oss-fuzz/ins= trumentation-filter new file mode 100644 index 0000000000..44e853159c --- /dev/null +++ b/scripts/oss-fuzz/instrumentation-filter @@ -0,0 +1,14 @@ +# Code that we actually want the fuzzer to target +# See: https://clang.llvm.org/docs/SanitizerCoverage.html#disabling-instru= mentation-without-source-modification +# +src:*/hw/* +src:*/include/hw/* +src:*/slirp/* + +# We don't care about coverage over fuzzer-specific code, however we should +# instrument the fuzzer entry-point so libFuzzer always sees at least some +# coverage - otherwise it will exit after the first input +src:*/tests/qtest/fuzz/fuzz.c + +# Enable instrumentation for all functions in those files +fun:* --=20 2.28.0 From nobody Thu May 2 00:02:52 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" TYPE_AC97 is "AC97", capitalized. Fix the config to account for that. Signed-off-by: Alexander Bulekov --- tests/qtest/fuzz/generic_fuzz_configs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests/qtest/fuzz/generic_fuzz_configs.h b/tests/qtest/fuzz/gen= eric_fuzz_configs.h index 004c701915..049697b974 100644 --- a/tests/qtest/fuzz/generic_fuzz_configs.h +++ b/tests/qtest/fuzz/generic_fuzz_configs.h @@ -218,7 +218,7 @@ const generic_fuzz_config predefined_configs[] =3D { .name =3D "ac97", .args =3D "-machine q35 -nodefaults " "-device ac97,audiodev=3Dsnd0 -audiodev none,id=3Dsnd0 -nodefaults= ", - .objects =3D "ac97*", + .objects =3D "ac97* AC97", },{ .name =3D "cs4231a", .args =3D "-machine q35 -nodefaults " --=20 2.28.0 From nobody Thu May 2 00:02:52 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1dmarc=pass fromdomain=bu.edu); 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dkim=none (message not signed) header.d=none;nongnu.org; dmarc=none action=none header.from=bu.edu; From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PATCH v2 4/4] fuzz: fix the ES1370 generic-fuzzer config. 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charset="utf-8" TYPE_ES1370 is "ES1370", capitalized. Fix the config to account for that. Signed-off-by: Alexander Bulekov --- tests/qtest/fuzz/generic_fuzz_configs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests/qtest/fuzz/generic_fuzz_configs.h b/tests/qtest/fuzz/gen= eric_fuzz_configs.h index 049697b974..5070bc175a 100644 --- a/tests/qtest/fuzz/generic_fuzz_configs.h +++ b/tests/qtest/fuzz/generic_fuzz_configs.h @@ -228,7 +228,7 @@ const generic_fuzz_config predefined_configs[] =3D { .name =3D "es1370", .args =3D "-machine q35 -nodefaults " "-device es1370,audiodev=3Dsnd0 -audiodev none,id=3Dsnd0 -nodefaul= ts", - .objects =3D "es1370*", + .objects =3D "es1370* ES1370", },{ .name =3D "sb16", .args =3D "-machine q35 -nodefaults " --=20 2.28.0