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From: Harman Kalra <hkalra@marvell.com>
To: Thomas Monjalon <thomas@monjalon.net>, John McNamara
<john.mcnamara@intel.com>, Marko Kovacevic <marko.kovacevic@intel.com>,
"Bruce Richardson" <bruce.richardson@intel.com>
CC: "dev@dpdk.org" <dev@dpdk.org>
Thread-Topic: [dpdk-dev] [PATCH] mk: add support for UBSAN
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Date: Wed, 9 Oct 2019 14:25:52 +0000
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Subject: Re: [dpdk-dev] [PATCH] mk: add support for UBSAN
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Ping..
On Fri, Sep 13, 2019 at 11:40:40AM +0000, Harman Kalra wrote:
> Ping..
> Kindly review this patch.
>=20
> On Mon, Aug 19, 2019 at 07:18:21PM +0530, Harman Kalra wrote:
> > UndefinedBehaviorSanitizer (UBSan) is a fast undefined behavior
> > detector. UBSan modifies the program at compile-time to catch
> > various kinds of undefined behavior during program execution.
> >=20
> > This patch implements support for UBSan to the DPDK.
> >=20
> > See: doc/guides/prog_guide/ubsan.rst for more information.
> >=20
> > Signed-off-by: Harman Kalra <hkalra@marvell.com>
> > ---
> > config/common_base | 6 ++
> > config/meson.build | 15 ++++
> > doc/guides/prog_guide/index.rst | 1 +
> > doc/guides/prog_guide/ubsan.rst | 112 +++++++++++++++++++++++++
> > doc/guides/rel_notes/release_19_11.rst | 7 ++
> > meson_options.txt | 2 +
> > mk/rte.app.mk | 10 +++
> > mk/rte.lib.mk | 12 +++
> > mk/toolchain/clang/rte.vars.mk | 4 +
> > mk/toolchain/gcc/rte.vars.mk | 8 ++
> > 10 files changed, 177 insertions(+)
> > create mode 100644 doc/guides/prog_guide/ubsan.rst
> >=20
> > diff --git a/config/common_base b/config/common_base
> > index 8ef75c203..b47a6f28e 100644
> > --- a/config/common_base
> > +++ b/config/common_base
> > @@ -1067,3 +1067,9 @@ CONFIG_RTE_APP_CRYPTO_PERF=3Dy
> > # Compile the eventdev application
> > #
> > CONFIG_RTE_APP_EVENTDEV=3Dy
> > +
> > +#
> > +# Enable undefined behavior sanitizer
> > +#
> > +CONFIG_RTE_UBSAN=3Dn
> > +CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dn
> > diff --git a/config/meson.build b/config/meson.build
> > index 2bafea530..6a2fa117d 100644
> > --- a/config/meson.build
> > +++ b/config/meson.build
> > @@ -196,3 +196,18 @@ add_project_arguments('-D_GNU_SOURCE', language: '=
c')
> > if is_freebsd
> > add_project_arguments('-D__BSD_VISIBLE', language: 'c')
> > endif
> > +
> > +# enable ubsan
> > +if get_option('enable_ubsan')
> > + if cc.has_argument('-fsanitize=3Dundefined')
> > + ubsan_dep =3D cc.find_library('libubsan', required: false)
> > + if ubsan_dep.found()
> > + add_project_arguments('-fsanitize=3Dundefined', language: 'c')
> > + add_project_link_arguments('-fsanitize=3Dundefined', language: 'c')
> > + else
> > + message('libubsan not found, UBSAN cannot be enabled')
> > + endif
> > + else
> > + message('gcc version does not support UBSAN')
> > + endif
> > +endif
> > diff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/in=
dex.rst
> > index 692409af8..970901e9a 100644
> > --- a/doc/guides/prog_guide/index.rst
> > +++ b/doc/guides/prog_guide/index.rst
> > @@ -66,4 +66,5 @@ Programmer's Guide
> > perf_opt_guidelines
> > writing_efficient_code
> > profile_app
> > + ubsan
> > glossary
> > diff --git a/doc/guides/prog_guide/ubsan.rst b/doc/guides/prog_guide/ub=
san.rst
> > new file mode 100644
> > index 000000000..cb19f3bd9
> > --- /dev/null
> > +++ b/doc/guides/prog_guide/ubsan.rst
> > @@ -0,0 +1,112 @@
> > +.. SPDX-License-Identifier: BSD-3-Clause
> > + Copyright(c) 2019 Marvell International Ltd.
> > +
> > +The Undefined Behavior Sanitizer - UBSan
> > +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > +
> > +UndefinedBehaviorSanitizer (UBSan) is a runtime undefined behavior det=
ector.
> > +UBSan uses compile-time instrumentation and modifies the program by ad=
ding
> > +some stubs which perform certain checks before operations that might c=
ause
> > +undefined behaviour. If some UB detected, respective _UBSan_handle_* h=
andlers
> > +(which are defined in libUBSan library) are called to prints the error=
message.
> > +
> > +Some examples of undefined behaviour checks:
> > +
> > +* Misaligned memory access
> > +* Signed integer overflow
> > +* Load from/store to an object with insufficient space.
> > +* Integer divide by zero as well as INT_MIN / -1 division
> > +* Out-of-bounds memory accesses.
> > +* Null argument declared with nonnull attribute, returned null from fu=
nction
> > + which never returns null, null ptr dereference
> > +* Variable size array with non-positive length
> > +
> > +GCC supports this feature since 4.9, however GCC 5.0 onwards has many =
more
> > +checkers implemented.
> > +
> > +Example UBSan error
> > +--------------------
> > +
> > +Following error was reported when UBSan was enabled:
> > +
> > +.. code-block:: console
> > +
> > + drivers/net/octeontx2/otx2_stats.c:82:26: runtime error: left shif=
t of
> > + 1 by 31 places cannot be represented in type 'int'
> > +
> > +Code responsible for this error:
> > +
> > +.. code-block:: c
> > +
> > + if (dev->txmap[i] & (1 << 31)) {
> > +
> > +To fix this error:
> > +
> > +.. code-block:: c
> > +
> > + if (dev->txmap[i] & (1U << 31)) {
> > +
> > +Usage
> > +-----
> > +
> > +make build
> > +^^^^^^^^^^
> > +
> > +To enable UBSan, enable following configuration:
> > +
> > +.. code-block:: console
> > +
> > + CONFIG_RTE_UBSAN=3Dy
> > +
> > +UBSan framework supports three modes:
> > +
> > +1. Enable UBSan on the entire DPDK source code - set following configu=
ration:
> > +
> > +.. code-block:: console
> > +
> > + CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dy
> > +
> > +2. Enable UBSan on a particular library or PMD - add the following lin=
e to the
> > + respective Makefile of the library or PMD
> > + (make sure ``CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dn``). This will instru=
ment only
> > + the library or PMD and not the entire repository.
> > +
> > +.. code-block:: console
> > +
> > + UBSAN_SANITIZE :=3D y
> > +
> > +3. Disable UBSan for a particular library or PMD - add the following l=
ine to
> > + the respective Makefile of the library or PMD. Make sure
> > + ``CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dy`` config is set. This will inst=
rument
> > + entire DPDK repository but not this specific library or PMD.
> > +
> > +.. code-block:: console
> > +
> > + UBSAN_SANITIZE :=3D n
> > +
> > +.. Note::
> > +
> > + Standard DPDK applications like test, testpmd, etc. cannot be
> > + chosen explicitly for UBSan check, like libraries or PMD. The reason=
is,
> > + say UBSan is enabled for library X, and ``UBSAN_SANITIZE=3Dy`` is no=
t added
> > + in Makefile of app Y which uses X APIs. This will lead to undefined
> > + reference to _UBSan_handle_* handlers as Y is not compiled with UBSa=
n flags.
> > + Hence UBSan check is enabled for all standard DPDK applications as s=
oon as
> > + ``CONFIG_RTE_UBSAN=3Dy`` is set.
> > +
> > +meson build
> > +^^^^^^^^^^^
> > +
> > +To enable UBSan in meson build system, use following meson build comma=
nd:
> > +
> > +**Example usage:**
> > +
> > +.. code-block:: console
> > +
> > + meson build -Denable_ubsan=3Dtrue
> > + ninja -C build
> > +
> > +.. Note::
> > +
> > + Meson build works only in one mode i.e. UBSan can be enabled for
> > + the entire DPDK sources and not individual libraries or PMD, like ma=
ke build.
> > diff --git a/doc/guides/rel_notes/release_19_11.rst b/doc/guides/rel_no=
tes/release_19_11.rst
> > index 8490d897c..cfefdbeec 100644
> > --- a/doc/guides/rel_notes/release_19_11.rst
> > +++ b/doc/guides/rel_notes/release_19_11.rst
> > @@ -56,6 +56,13 @@ New Features
> > Also, make sure to start the actual text at the margin.
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > =20
> > +* **Added Undefined Behavior Sanitizer framework.**
> > +
> > + UBSan is a fast runtime undefined behavior detector which uses compi=
le-time
> > + instrumentation and modifies the program by adding some stubs that p=
erform
> > + certain checks before operations that might cause undefined behavior=
.
> > +
> > + See :doc:`../prog_guide/ubsan` for more information:
> > =20
> > Removed Items
> > -------------
> > diff --git a/meson_options.txt b/meson_options.txt
> > index 448f3e63d..fb0aead00 100644
> > --- a/meson_options.txt
> > +++ b/meson_options.txt
> > @@ -8,6 +8,8 @@ option('enable_docs', type: 'boolean', value: false,
> > description: 'build documentation')
> > option('enable_kmods', type: 'boolean', value: true,
> > description: 'build kernel modules')
> > +option('enable_ubsan', type: 'boolean', value: false,
> > + description: 'Enables undefined behavior sanitizer')
> > option('examples', type: 'string', value: '',
> > description: 'Comma-separated list of examples to build by default')
> > option('flexran_sdk', type: 'string', value: '',
> > diff --git a/mk/rte.app.mk b/mk/rte.app.mk
> > index ba5c39e01..9ea421a83 100644
> > --- a/mk/rte.app.mk
> > +++ b/mk/rte.app.mk
> > @@ -374,6 +374,16 @@ endif
> > =20
> > MAPFLAGS =3D -Map=3D$@.map --cref
> > =20
> > +#
> > +# If UBSAN is enabled, all application will be compiled with
> > +# '-fsanitize=3Dundefined' flag
> > +#
> > +ifeq ($(CONFIG_RTE_UBSAN),y)
> > +ifeq ($(UBSAN_ENABLE),y)
> > +CFLAGS +=3D -fsanitize=3Dundefined
> > +endif
> > +endif
> > +
> > .PHONY: all
> > all: install
> > =20
> > diff --git a/mk/rte.lib.mk b/mk/rte.lib.mk
> > index 4df8849a0..33f5746c8 100644
> > --- a/mk/rte.lib.mk
> > +++ b/mk/rte.lib.mk
> > @@ -29,6 +29,18 @@ CPU_LDFLAGS +=3D --version-script=3D$(SRCDIR)/$(EXPO=
RT_MAP)
> > endif
> > endif
> > =20
> > +#
> > +# If UBSAN is enabled, lib to undergo check can be chosen
> > +# by setting UBSAN_SANITIZE=3Dy in respective lib Makefile
> > +# else set CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dy to enforce check
> > +# on entire repo.
> > +#
> > +ifeq ($(CONFIG_RTE_UBSAN),y)
> > +ifeq ($(UBSAN_ENABLE),y)
> > +CFLAGS +=3D $(if $(patsubst %n,,$(CONFIG_RTE_UBSAN_SANITIZE_ALL)$(UBSA=
N_SANITIZE)) \
> > + , -fsanitize=3Dundefined)
> > +endif
> > +endif
> > =20
> > _BUILD =3D $(LIB)
> > PREINSTALL =3D $(SYMLINK-FILES-y)
> > diff --git a/mk/toolchain/clang/rte.vars.mk b/mk/toolchain/clang/rte.va=
rs.mk
> > index 3c49dc568..623780106 100644
> > --- a/mk/toolchain/clang/rte.vars.mk
> > +++ b/mk/toolchain/clang/rte.vars.mk
> > @@ -56,5 +56,9 @@ ifeq ($(shell test $(CLANG_MAJOR_VERSION) -ge 4 && ec=
ho 1), 1)
> > WERROR_FLAGS +=3D -Wno-address-of-packed-member
> > endif
> > =20
> > +ifeq ($(CONFIG_RTE_UBSAN),y)
> > +UBSAN_ENABLE :=3D y
> > +endif
> > +
> > export CC AS AR LD OBJCOPY OBJDUMP STRIP READELF
> > export TOOLCHAIN_CFLAGS TOOLCHAIN_LDFLAGS TOOLCHAIN_ASFLAGS
> > diff --git a/mk/toolchain/gcc/rte.vars.mk b/mk/toolchain/gcc/rte.vars.m=
k
> > index b852fcfd7..d40e14d61 100644
> > --- a/mk/toolchain/gcc/rte.vars.mk
> > +++ b/mk/toolchain/gcc/rte.vars.mk
> > @@ -90,5 +90,13 @@ endif
> > # disable packed member unalign warnings
> > WERROR_FLAGS +=3D -Wno-address-of-packed-member
> > =20
> > +ifeq ($(CONFIG_RTE_UBSAN),y)
> > +ifeq ($(shell test $(GCC_VERSION) -lt 49 && echo 1), 1)
> > +$(warning UBSAN not supported gcc < 4.9)
> > +else
> > +UBSAN_ENABLE =3D y
> > +endif
> > +endif
> > +
> > export CC AS AR LD OBJCOPY OBJDUMP STRIP READELF
> > export TOOLCHAIN_CFLAGS TOOLCHAIN_LDFLAGS TOOLCHAIN_ASFLAGS
> > --=20
> > 2.18.0
> >=20