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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>, Harman Kalra <hkalra@marvell.com>
Thread-Topic: [PATCH v3] mk: add support for UBSAN
Thread-Index: AQHVm8oeMwfcY0KD3Uq9x+Bcnh2VbQ==
Date: Fri, 15 Nov 2019 15:34:06 +0000
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definitions=2019-11-15_04:2019-11-15,2019-11-15 signatures=0
Subject: [dpdk-dev] [PATCH v3] mk: add support for UBSAN
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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.
This patch introduces support for UBSan to the DPDK.
See: doc/guides/prog_guide/ubsan.rst for more information.
Signed-off-by: Harman Kalra <hkalra@marvell.com>
---
V2:
* Addressed review comment regarding combining two
ifeq into one.
V3:
* Added version change logs.
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 | 8 ++
mk/rte.lib.mk | 12 +++
mk/toolchain/clang/rte.vars.mk | 4 +
mk/toolchain/gcc/rte.vars.mk | 8 ++
10 files changed, 175 insertions(+)
create mode 100644 doc/guides/prog_guide/ubsan.rst
diff --git a/config/common_base b/config/common_base
index 914277856..f1bb3e0b2 100644
--- a/config/common_base
+++ b/config/common_base
@@ -1098,3 +1098,9 @@ 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 2b1cb92e7..a43c23f50 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -238,3 +238,18 @@ if get_option('b_lto')
add_project_link_arguments('-Wno-lto-type-mismatch', language: 'c')
endif
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/index.=
rst
index dc4851c57..911b82a41 100644
--- a/doc/guides/prog_guide/index.rst
+++ b/doc/guides/prog_guide/index.rst
@@ -67,4 +67,5 @@ Programmer's Guide
writing_efficient_code
lto
profile_app
+ ubsan
glossary
diff --git a/doc/guides/prog_guide/ubsan.rst b/doc/guides/prog_guide/ubsan.=
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 detecto=
r.
+UBSan uses compile-time instrumentation and modifies the program by adding
+some stubs which perform certain checks before operations that might cause
+undefined behaviour. If some UB detected, respective _UBSan_handle_* handl=
ers
+(which are defined in libUBSan library) are called to prints the error mes=
sage.
+
+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 functi=
on
+ 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 shift 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 configurati=
on:
+
+.. code-block:: console
+
+ CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dy
+
+2. Enable UBSan on a particular library or PMD - add the following line to=
the
+ respective Makefile of the library or PMD
+ (make sure ``CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dn``). This will instrument=
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 line =
to
+ the respective Makefile of the library or PMD. Make sure
+ ``CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dy`` config is set. This will instrume=
nt
+ 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 not ad=
ded
+ 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 UBSan fl=
ags.
+ Hence UBSan check is enabled for all standard DPDK applications as soon =
as
+ ``CONFIG_RTE_UBSAN=3Dy`` is set.
+
+meson build
+^^^^^^^^^^^
+
+To enable UBSan in meson build system, use following meson build command:
+
+**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 make b=
uild.
diff --git a/doc/guides/rel_notes/release_19_11.rst b/doc/guides/rel_notes/=
release_19_11.rst
index c0045a91f..61fd1bcc2 100644
--- a/doc/guides/rel_notes/release_19_11.rst
+++ b/doc/guides/rel_notes/release_19_11.rst
@@ -294,6 +294,13 @@ New Features
=20
See :doc:`../prog_guide/lto` for more information:
=20
+* **Added Undefined Behavior Sanitizer framework.**
+
+ UBSan is a fast runtime undefined behavior detector which uses compile-t=
ime
+ instrumentation and modifies the program by adding some stubs that perfo=
rm
+ certain checks before operations that might cause undefined behavior.
+
+ See :doc:`../prog_guide/ubsan` for more information:
=20
=20
Removed Items
diff --git a/meson_options.txt b/meson_options.txt
index 89650b0e9..f3b42d2b1 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -10,6 +10,8 @@ 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 683e3a4e3..1304227cf 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -385,6 +385,14 @@ 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)$(UBSAN_ENABLE),yy)
+CFLAGS +=3D -fsanitize=3Dundefined
+endif
+
.PHONY: all
all: install
=20
diff --git a/mk/rte.lib.mk b/mk/rte.lib.mk
index 4df8849a0..33f5746c8 100644
--- a/mk/rte.lib.mk
+++ b/mk/rte.lib.mk
@@ -29,6 +29,18 @@ CPU_LDFLAGS +=3D --version-script=3D$(SRCDIR)/$(EXPORT_M=
AP)
endif
endif
=20
+#
+# If UBSAN is enabled, lib to undergo check can be chosen
+# by setting UBSAN_SANITIZE=3Dy in respective lib Makefile
+# else set CONFIG_RTE_UBSAN_SANITIZE_ALL=3Dy to enforce check
+# on entire repo.
+#
+ifeq ($(CONFIG_RTE_UBSAN),y)
+ifeq ($(UBSAN_ENABLE),y)
+CFLAGS +=3D $(if $(patsubst %n,,$(CONFIG_RTE_UBSAN_SANITIZE_ALL)$(UBSAN_SA=
NITIZE)) \
+ , -fsanitize=3Dundefined)
+endif
+endif
=20
_BUILD =3D $(LIB)
PREINSTALL =3D $(SYMLINK-FILES-y)
diff --git a/mk/toolchain/clang/rte.vars.mk b/mk/toolchain/clang/rte.vars.m=
k
index 3c49dc568..623780106 100644
--- a/mk/toolchain/clang/rte.vars.mk
+++ b/mk/toolchain/clang/rte.vars.mk
@@ -56,5 +56,9 @@ ifeq ($(shell test $(CLANG_MAJOR_VERSION) -ge 4 && echo 1=
), 1)
WERROR_FLAGS +=3D -Wno-address-of-packed-member
endif
=20
+ifeq ($(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.mk
index 9fc704193..43e7d139b 100644
--- a/mk/toolchain/gcc/rte.vars.mk
+++ b/mk/toolchain/gcc/rte.vars.mk
@@ -102,5 +102,13 @@ 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