Hi
On 23/08/2019 18:16, Andrey Konovalov wrote:
On Fri, Aug 23, 2019 at 3:56 PM Cristian Marussi cristian.marussi@arm.com wrote:
Hi Andrey
On 24/06/2019 15:33, Andrey Konovalov wrote:
This patch is a part of a series that extends kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments.
This patch adds a simple test, that calls the uname syscall with a tagged user pointer as an argument. Without the kernel accepting tagged user pointers the test fails with EFAULT.
Signed-off-by: Andrey Konovalov andreyknvl@google.com
tools/testing/selftests/arm64/.gitignore | 1 + tools/testing/selftests/arm64/Makefile | 11 +++++++ .../testing/selftests/arm64/run_tags_test.sh | 12 ++++++++ tools/testing/selftests/arm64/tags_test.c | 29 +++++++++++++++++++ 4 files changed, 53 insertions(+) create mode 100644 tools/testing/selftests/arm64/.gitignore create mode 100644 tools/testing/selftests/arm64/Makefile create mode 100755 tools/testing/selftests/arm64/run_tags_test.sh create mode 100644 tools/testing/selftests/arm64/tags_test.c
After building a fresh Kernel from arm64/for-next-core from scratch at:
commit 239ab658bea3b387424501e7c416640d6752dc0c Merge: 6bfa3134bd3a 42d038c4fb00 1243cb6a676f d55c5f28afaf d06fa5a118f1 34b5560db40d Author: Will Deacon will@kernel.org Date: Thu Aug 22 18:23:53 2019 +0100
Merge branches 'for-next/error-injection', 'for-next/tbi', 'for-next/psci-cpuidle', 'for-next/cpu-topology' and 'for-next/52-bit-kva' into for-next/coreKSFT arm64 tests build is broken for me, both setting or not KBUILD_OUTPUT=
13:30 $ make TARGETS=arm64 kselftest-clean make[1]: Entering directory '/home/crimar01/ARM/dev/src/pdsw/out_linux' rm -f -r /home/crimar01/ARM/dev/src/pdsw/out_linux//kselftest/arm64/tags_test make[1]: Leaving directory '/home/crimar01/ARM/dev/src/pdsw/out_linux'
✔ ~/ARM/dev/src/pdsw/linux [arm64_for_next_core|…8⚑ 23]
13:30 $ make TARGETS=arm64 kselftest make[1]: Entering directory '/home/crimar01/ARM/dev/src/pdsw/out_linux' arch/arm64/Makefile:56: CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built make --no-builtin-rules INSTALL_HDR_PATH=$BUILD/usr \ ARCH=arm64 -C ../../.. headers_install HOSTCC scripts/basic/fixdep HOSTCC scripts/unifdef ... ... HDRINST usr/include/asm/msgbuf.h HDRINST usr/include/asm/shmbuf.h INSTALL /home/crimar01/ARM/dev/src/pdsw/out_linux//kselftest/usr/include /opt/toolchains/gcc-arm-8.3-2019.03-x86_64-aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc tags_test.c -o /home/crimar01/ARM/dev/src/pdsw/out_linux//kselftest/arm64/tags_test tags_test.c: In function ‘main’: tags_test.c:21:12: error: ‘PR_SET_TAGGED_ADDR_CTRL’ undeclared (first use in this function); did you mean ‘PR_GET_TID_ADDRESS’? if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0) ^~~~~~~~~~~~~~~~~~~~~~~ PR_GET_TID_ADDRESS tags_test.c:21:12: note: each undeclared identifier is reported only once for each function it appears in tags_test.c:21:37: error: ‘PR_TAGGED_ADDR_ENABLE’ undeclared (first use in this function); did you mean ‘PR_GET_DUMPABLE’? if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0) ^~~~~~~~~~~~~~~~~~~~~ PR_GET_DUMPABLE ../lib.mk:138: recipe for target '/home/crimar01/ARM/dev/src/pdsw/out_linux//kselftest/arm64/tags_test' failed make[3]: *** [/home/crimar01/ARM/dev/src/pdsw/out_linux//kselftest/arm64/tags_test] Error 1 Makefile:136: recipe for target 'all' failed make[2]: *** [all] Error 2 /home/crimar01/ARM/dev/src/pdsw/linux/Makefile:1237: recipe for target 'kselftest' failed make[1]: *** [kselftest] Error 2 make[1]: Leaving directory '/home/crimar01/ARM/dev/src/pdsw/out_linux' Makefile:179: recipe for target 'sub-make' failed make: *** [sub-make] Error 2
Despite seeing KSFT installing Kernel Headers, they cannot be found.
Fixing this patch like this make it work for me:
diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile index a61b2e743e99..f9f79fb272f0 100644 --- a/tools/testing/selftests/arm64/Makefile +++ b/tools/testing/selftests/arm64/Makefile @@ -4,6 +4,7 @@ ARCH ?= $(shell uname -m 2>/dev/null || echo not)
ifneq (,$(filter $(ARCH),aarch64 arm64)) +CFLAGS += -I../../../../usr/include/ TEST_GEN_PROGS := tags_test TEST_PROGS := run_tags_test.sh endif
but is not really a proper fix since it does NOT account for case in which you have installed the Kernel Headers in a non standard location like when you use KBUILD_OUTPUT.
Am I missing something ?
Hm, PR_SET_TAGGED_ADDR_CTRL is defined in include/uapi/linux/prctl.h, and the test has #include <sys/prctl.h> so as long as you've updated your kernel headers this should work.
(I'm OOO next week, I'll see if I can reproduce this once I'm back).
Ok. Thanks for the reply.
I think I've got it in my local tree having cloned arm64/for-next-core:
18:32 $ egrep -A 10 PR_SET_TAG ./include/uapi/linux/prctl.h #define PR_SET_TAGGED_ADDR_CTRL 55 #define PR_GET_TAGGED_ADDR_CTRL 56 # define PR_TAGGED_ADDR_ENABLE (1UL << 0)
#endif /* _LINUX_PRCTL_H */
and Kernel header are locally installed in my kernel src dir (by KSFT indeed)
18:34 $ egrep -RA 10 PR_SET_TAG usr/include/ usr/include/linux/prctl.h:#define PR_SET_TAGGED_ADDR_CTRL 55 usr/include/linux/prctl.h-#define PR_GET_TAGGED_ADDR_CTRL 56 usr/include/linux/prctl.h-# define PR_TAGGED_ADDR_ENABLE (1UL << 0) usr/include/linux/prctl.h- usr/include/linux/prctl.h-#endif /* _LINUX_PRCTL_H */
but how are they supposed to be found if nor the test Makefile neither the KSFT Makefile who installs them pass any -I options to the compiler ? I suppose <sys/prctl.h> tries to include arch specific headers from the regular system path, but when you are cross-compiling ?
18:34 $ make TARGETS=arm64 kselftest make[1]: Entering directory '/home/crimar01/ARM/dev/src/pdsw/out_linux' arch/arm64/Makefile:56: CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built make --no-builtin-rules INSTALL_HDR_PATH=$BUILD/usr \ ARCH=arm64 -C ../../.. headers_install INSTALL /home/crimar01/ARM/dev/src/pdsw/out_linux/kselftest/usr/include /opt/toolchains/gcc-arm-8.3-2019.03-x86_64-aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc -Wall -O2 -g tags_test.c -o /home/crimar01/ARM/dev/src/pdsw/out_linux/kselftest/arm64/tags/tags_test tags_test.c: In function ‘main’: tags_test.c:20:12: error: ‘PR_SET_TAGGED_ADDR_CTRL’ undeclared (first use in this function); did you mean ‘PR_GET_TID_ADDRESS’? if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0) ^~~~~~~~~~~~~~~~~~~~~~~ PR_GET_TID_ADDRESS tags_test.c:20:12: note: each undeclared identifier is reported only once for each function it appears in tags_test.c:20:37: error: ‘PR_TAGGED_ADDR_ENABLE’ undeclared (first use in this function); did you mean ‘PR_GET_DUMPABLE’? if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0) ^~~~~~~~~~~~~~~~~~~~~ PR_GET_DUMPABLE ../../lib.mk:138: recipe for target '/home/crimar01/ARM/dev/src/pdsw/out_linux/kselftest/arm64/tags/tags_test' failed make[4]: *** [/home/crimar01/ARM/dev/src/pdsw/out_linux/kselftest/arm64/tags/tags_test] Error 1 Makefile:19: recipe for target 'all' failed make[3]: *** [all] Error 2 Makefile:137: recipe for target 'all' failed make[2]: *** [all] Error 2 /home/crimar01/ARM/dev/src/pdsw/linux/Makefile:1236: recipe for target 'kselftest' failed make[1]: *** [kselftest] Error 2 make[1]: Leaving directory '/home/crimar01/ARM/dev/src/pdsw/out_linux' Makefile:179: recipe for target 'sub-make' failed make: *** [sub-make] Error 2
In fact many KSFT testcases seems to brutally add default headers path:
tools/testing/selftests/memfd/Makefile:CFLAGS += -I../../../../include/uapi/ tools/testing/selftests/memfd/Makefile:CFLAGS += -I../../../../include/ tools/testing/selftests/memfd/Makefile:CFLAGS += -I../../../../usr/include/ tools/testing/selftests/net/Makefile:CFLAGS += -I../../../../usr/include/ tools/testing/selftests/membarrier/Makefile:CFLAGS += -g -I../../../../usr/include/ ...
Cheers
Cristian
Thanks
Cristian
diff --git a/tools/testing/selftests/arm64/.gitignore b/tools/testing/selftests/arm64/.gitignore new file mode 100644 index 000000000000..e8fae8d61ed6 --- /dev/null +++ b/tools/testing/selftests/arm64/.gitignore @@ -0,0 +1 @@ +tags_test diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile new file mode 100644 index 000000000000..a61b2e743e99 --- /dev/null +++ b/tools/testing/selftests/arm64/Makefile @@ -0,0 +1,11 @@ +# SPDX-License-Identifier: GPL-2.0
+# ARCH can be overridden by the user for cross compiling +ARCH ?= $(shell uname -m 2>/dev/null || echo not)
+ifneq (,$(filter $(ARCH),aarch64 arm64)) +TEST_GEN_PROGS := tags_test +TEST_PROGS := run_tags_test.sh +endif
+include ../lib.mk diff --git a/tools/testing/selftests/arm64/run_tags_test.sh b/tools/testing/selftests/arm64/run_tags_test.sh new file mode 100755 index 000000000000..745f11379930 --- /dev/null +++ b/tools/testing/selftests/arm64/run_tags_test.sh @@ -0,0 +1,12 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0
+echo "--------------------" +echo "running tags test" +echo "--------------------" +./tags_test +if [ $? -ne 0 ]; then
echo "[FAIL]"+else
echo "[PASS]"+fi diff --git a/tools/testing/selftests/arm64/tags_test.c b/tools/testing/selftests/arm64/tags_test.c new file mode 100644 index 000000000000..22a1b266e373 --- /dev/null +++ b/tools/testing/selftests/arm64/tags_test.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <stdint.h> +#include <sys/prctl.h> +#include <sys/utsname.h>
+#define SHIFT_TAG(tag) ((uint64_t)(tag) << 56) +#define SET_TAG(ptr, tag) (((uint64_t)(ptr) & ~SHIFT_TAG(0xff)) | \
SHIFT_TAG(tag))+int main(void) +{
static int tbi_enabled = 0;struct utsname *ptr, *tagged_ptr;int err;if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0)tbi_enabled = 1;ptr = (struct utsname *)malloc(sizeof(*ptr));if (tbi_enabled)tagged_ptr = (struct utsname *)SET_TAG(ptr, 0x42);err = uname(tagged_ptr);free(ptr);return err;+}