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bh=FVLJQBlpzqBBVnliqAGNcm2SnVqNp/hd2S0oSd+u5cU=; b=ZO8USNwytS+Robb89ZTXU3HeouIT0XbW7BH2/uJp2RqBMBiPextCh8245N/4E4++2vAGdV k8hJR7dE6eNaDDlGfymUUPMr31f5yFvvsgOoeMtDMNV1QJaJmU9Osw2gmQFGhtkAzZXDHj AtE0NfrFHfM9mOAShdwsxvkZgwe5SnQ= X-MC-Unique: NvykFi2-NbG1jOnfmzoVFQ-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH v3 2/4] util: introduce qemu_open and qemu_create with error reporting Date: Fri, 24 Jul 2020 14:25:08 +0100 Message-Id: <20200724132510.3250311-3-berrange@redhat.com> In-Reply-To: <20200724132510.3250311-1-berrange@redhat.com> References: <20200724132510.3250311-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.61; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/24 06:44:00 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, 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: Kevin Wolf , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , qemu-block@nongnu.org, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Markus Armbruster , Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) This introduces two new helper metohds int qemu_open(const char *name, int flags, Error **errp); int qemu_create(const char *name, int flags, mode_t mode, Error **errp); Note that with this design we no longer require or even accept the O_CREAT flag. Avoiding overloading the two distinct operations means we can avoid variable arguments which would prevent 'errp' from being the last argument. It also gives us a guarantee that the 'mode' is given when creating files, avoiding a latent security bug. Signed-off-by: Daniel P. Berrang=C3=A9 Reviewed-by: Eric Blake Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- include/qemu/osdep.h | 6 ++++ util/osdep.c | 78 ++++++++++++++++++++++++++++++++++++-------- 2 files changed, 71 insertions(+), 13 deletions(-) diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h index 3a16e58932..ca24ebe211 100644 --- a/include/qemu/osdep.h +++ b/include/qemu/osdep.h @@ -494,7 +494,13 @@ int qemu_madvise(void *addr, size_t len, int advice); int qemu_mprotect_rwx(void *addr, size_t size); int qemu_mprotect_none(void *addr, size_t size); =20 +/* + * Don't introduce new usage of this function, prefer the following + * qemu_open/qemu_create that take a "Error **errp" + */ int qemu_open_old(const char *name, int flags, ...); +int qemu_open(const char *name, int flags, Error **errp); +int qemu_create(const char *name, int flags, mode_t mode, Error **errp); int qemu_close(int fd); int qemu_unlink(const char *name); #ifndef _WIN32 diff --git a/util/osdep.c b/util/osdep.c index 9df1b6adec..5c0f4684b1 100644 --- a/util/osdep.c +++ b/util/osdep.c @@ -22,6 +22,7 @@ * THE SOFTWARE. */ #include "qemu/osdep.h" +#include "qapi/error.h" =20 /* Needed early for CONFIG_BSD etc. */ =20 @@ -282,10 +283,10 @@ int qemu_lock_fd_test(int fd, int64_t start, int64_t = len, bool exclusive) /* * Opens a file with FD_CLOEXEC set */ -int qemu_open_old(const char *name, int flags, ...) +static int +qemu_open_internal(const char *name, int flags, mode_t mode, Error **errp) { int ret; - int mode =3D 0; =20 #ifndef _WIN32 const char *fdset_id_str; @@ -297,24 +298,31 @@ int qemu_open_old(const char *name, int flags, ...) =20 fdset_id =3D qemu_parse_fdset(fdset_id_str); if (fdset_id =3D=3D -1) { + error_setg(errp, "Could not parse fdset %s", name); errno =3D EINVAL; return -1; } =20 fd =3D monitor_fdset_get_fd(fdset_id, flags); if (fd < 0) { + error_setg_errno(errp, -fd, "Could not acquire FD for %s flags= %x", + name, flags); errno =3D -fd; return -1; } =20 dupfd =3D qemu_dup_flags(fd, flags); if (dupfd =3D=3D -1) { + error_setg_errno(errp, errno, "Could not dup FD for %s flags %= x", + name, flags); return -1; } =20 ret =3D monitor_fdset_dup_fd_add(fdset_id, dupfd); if (ret =3D=3D -1) { close(dupfd); + error_setg(errp, "Could not save FD for %s flags %x", + name, flags); errno =3D EINVAL; return -1; } @@ -323,22 +331,66 @@ int qemu_open_old(const char *name, int flags, ...) } #endif =20 - if (flags & O_CREAT) { - va_list ap; - - va_start(ap, flags); - mode =3D va_arg(ap, int); - va_end(ap); - } - #ifdef O_CLOEXEC - ret =3D open(name, flags | O_CLOEXEC, mode); -#else + flags |=3D O_CLOEXEC; +#endif /* O_CLOEXEC */ + ret =3D open(name, flags, mode); + +#ifndef O_CLOEXEC if (ret >=3D 0) { qemu_set_cloexec(ret); } -#endif +#endif /* ! O_CLOEXEC */ + + if (ret =3D=3D -1) { + const char *action =3D "open"; + if (flags & O_CREAT) { + action =3D "create"; + } + error_setg_errno(errp, errno, "Could not %s '%s' flags 0x%x", + action, name, flags); + } + + + return ret; +} + + +int qemu_open(const char *name, int flags, Error **errp) +{ + if (flags & O_CREAT) { + error_setg(errp, + "Invalid O_CREAT flag passed to qemu_open, use qemu_cre= ate"); + return -1; + } + return qemu_open_internal(name, flags, 0, errp); +} + + +int qemu_create(const char *name, int flags, mode_t mode, Error **errp) +{ + if (flags & O_CREAT) { + error_setg(errp, "Redundant O_CREAT flag passed to qemu_create"); + return -1; + } + return qemu_open_internal(name, flags | O_CREAT, mode, errp); +} + + +int qemu_open_old(const char *name, int flags, ...) +{ + va_list ap; + mode_t mode =3D 0; + int ret; + + va_start(ap, flags); + if (flags & O_CREAT) { + mode =3D va_arg(ap, int); + } + va_end(ap); + + ret =3D qemu_open_internal(name, flags, mode, NULL); =20 #ifdef O_DIRECT if (ret =3D=3D -1 && errno =3D=3D EINVAL && (flags & O_DIRECT)) { --=20 2.26.2