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Fri, 20 Jun 2025 02:48:17 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20250611-kunit-kselftests-v3-0-55e3d148cbc6@linutronix.de> <20250611-kunit-kselftests-v3-15-55e3d148cbc6@linutronix.de> In-Reply-To: <20250611-kunit-kselftests-v3-15-55e3d148cbc6@linutronix.de> From: David Gow Date: Fri, 20 Jun 2025 17:48:03 +0800 X-Gm-Features: Ac12FXw0vvK0kNUL8PLM_I85MLksd3wdHePhrJe7vZL6QWot_OYNXjXBHL8Pg2A Message-ID: Subject: Re: [PATCH v3 15/16] kunit: uapi: Introduce preinit executable To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= Cc: Masahiro Yamada , Nathan Chancellor , Andrew Morton , Willy Tarreau , =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= , Brendan Higgins , Rae Moar , Shuah Khan , Jonathan Corbet , Nicolas Schier , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Christophe Leroy , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, workflows@vger.kernel.org Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000fe8f410637fdc24b" --000000000000fe8f410637fdc24b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 11 Jun 2025 at 15:38, Thomas Wei=C3=9Fschuh wrote: > > UAPI selftests may expect a "normal" userspace environment. > For example the normal kernel API pseudo-filesystems should be mounted. > This could be done from kernel code but it is non-idiomatic. > > Add a preinit userspace executable which performs these setup steps > before running the final test executable. > This preinit executable is only ever run from the kernel. > Give it access to autoconf.h and kconfig.h to adapt itself to the > tested kernel. > > Signed-off-by: Thomas Wei=C3=9Fschuh > --- Looks good and works here. Reviewed-by: David Gow (Although, personally, _I wish_ it were more idiomatic to mount things from kernelspace.) Cheers, -- David > lib/kunit/Makefile | 9 ++++++- > lib/kunit/uapi-preinit.c | 63 ++++++++++++++++++++++++++++++++++++++++++= ++++++ > lib/kunit/uapi.c | 11 +++++++-- > 3 files changed, 80 insertions(+), 3 deletions(-) > > diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile > index e406a31df1df834a87961663de0b7921b59481c2..19493ec320c61e2ccbb58e8b2= e943e9a4ec447e2 100644 > --- a/lib/kunit/Makefile > +++ b/lib/kunit/Makefile > @@ -12,7 +12,14 @@ kunit-objs +=3D test.o = \ > device.o \ > platform.o > > -kunit-$(CONFIG_KUNIT_UAPI) +=3D uapi.o > +userprogs +=3D uapi-preinit > +uapi-preinit-nolibc :=3D $(CONFIG_ARCH_HAS_NOLIBC) > +uapi-preinit-userccflags +=3D -static \ > + -include include/generated/autoco= nf.h \ > + -include $(srctree)/tools/include= /linux/kconfig.h > +blobs +=3D uapi-preinit.blob.o > +uapi-preinit.blob-symbol :=3D kunit_uapi_preinit > +kunit-$(CONFIG_KUNIT_UAPI) +=3D uapi.o uapi-preinit.blob.o > > ifeq ($(CONFIG_KUNIT_DEBUGFS),y) > kunit-objs +=3D debugfs.o > diff --git a/lib/kunit/uapi-preinit.c b/lib/kunit/uapi-preinit.c > new file mode 100644 > index 0000000000000000000000000000000000000000..81182039965a8c93aebb2d5d7= 6f4113bfef277a6 > --- /dev/null > +++ b/lib/kunit/uapi-preinit.c > @@ -0,0 +1,63 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * KUnit Userspace environment setup. > + * > + * Copyright (C) 2025, Linutronix GmbH. > + * Author: Thomas Wei=C3=9Fschuh > + * > + * This is *userspace* code. > + */ > + > +#include > +#include > + > +#include "../../tools/testing/selftests/kselftest.h" > + > +static int setup_api_mount(const char *target, const char *fstype) > +{ > + int ret; > + > + ret =3D mkdir(target, 0755); > + if (ret && errno !=3D EEXIST) > + return -errno; > + > + ret =3D mount("none", target, fstype, 0, NULL); > + if (ret && errno !=3D EBUSY) > + return -errno; > + > + return 0; > +} > + > +static void exit_failure(const char *stage, int err) > +{ > + /* If preinit fails synthesize a failed test report. */ > + ksft_print_header(); > + ksft_set_plan(1); > + ksft_test_result_fail("Failed during test setup: %s: %s\n", stage= , strerror(-err)); > + ksft_finished(); > +} > + > +int main(int argc, char **argv, char **envp) > +{ > + int ret; > + > + ret =3D setup_api_mount("/proc", "proc"); > + if (ret) > + exit_failure("mount /proc", ret); > + > + ret =3D setup_api_mount("/sys", "sysfs"); > + if (ret) > + exit_failure("mount /sys", ret); > + > + if (IS_ENABLED(CONFIG_DEVTMPFS)) { > + ret =3D setup_api_mount("/dev", "devtmpfs"); > + if (ret) > + exit_failure("mount /dev", ret); > + } > + > + ret =3D execve(argv[0], argv, envp); > + if (ret) > + exit_failure("execve", ret); > + > + return 0; > +} > diff --git a/lib/kunit/uapi.c b/lib/kunit/uapi.c > index 121146dda533b3f90aca37c20bd0e7a1d20cb3b5..bccc081a6538507724c1ef340= 203cfd147170dc4 100644 > --- a/lib/kunit/uapi.c > +++ b/lib/kunit/uapi.c > @@ -139,7 +139,7 @@ static int kunit_uapi_user_mode_thread_init(void *dat= a) > kernel_sigaction(SIGABRT, SIG_DFL); > > complete(&ctx->setup_done); > - ctx->exec_err =3D kernel_execve(ctx->executable, argv, NULL); > + ctx->exec_err =3D kernel_execve(kbasename(BLOB(kunit_uapi_preinit= )->path), argv, NULL); > if (!ctx->exec_err) > return 0; > do_exit(0); > @@ -239,6 +239,7 @@ static int kunit_uapi_run_executable_in_mount(struct = kunit *test, const char *ex > > static int kunit_uapi_run_executable(struct kunit *test, const struct bl= ob *executable) > { > + const struct blob *preinit =3D BLOB(kunit_uapi_preinit); > const char *exe_name =3D kbasename(executable->path); > struct vfsmount *mnt; > int err; > @@ -247,7 +248,13 @@ static int kunit_uapi_run_executable(struct kunit *t= est, const struct blob *exec > if (IS_ERR(mnt)) > return PTR_ERR(mnt); > > - err =3D kunit_uapi_write_file(mnt, exe_name, 0755, executable->da= ta, blob_size(executable)); > + err =3D kunit_uapi_write_file(mnt, kbasename(preinit->path), 0755= , > + preinit->data, > + blob_size(preinit)); > + > + if (!err) > + err =3D kunit_uapi_write_file(mnt, exe_name, 0755, > + executable->data, blob_size(e= xecutable)); > > if (!err) > err =3D kunit_uapi_run_executable_in_mount(test, exe_name= , mnt); > > -- > 2.49.0 > --000000000000fe8f410637fdc24b Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIUnQYJKoZIhvcNAQcCoIIUjjCCFIoCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ghIEMIIGkTCCBHmgAwIBAgIQfofDAVIq0iZG5Ok+mZCT2TANBgkqhkiG9w0BAQwFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSNjETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMzA0MTkwMzUzNDdaFw0zMjA0MTkwMDAwMDBaMFQxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMSowKAYDVQQDEyFHbG9iYWxTaWduIEF0bGFz IFI2IFNNSU1FIENBIDIwMjMwggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQDYydcdmKyg 4IBqVjT4XMf6SR2Ix+1ChW2efX6LpapgGIl63csmTdJQw8EcbwU9C691spkltzTASK2Ayi4aeosB 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