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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Aug 28, 2020 at 02:16:05PM +0100, Boyan Karatotev wrote: > Kernel documentation states that it will change PAuth keys on exec() calls. > > Verify that all keys are correctly switched to new ones. > > Cc: Shuah Khan > Cc: Catalin Marinas > Cc: Will Deacon > Signed-off-by: Boyan Karatotev > --- > tools/testing/selftests/arm64/pauth/Makefile | 4 + > .../selftests/arm64/pauth/exec_target.c | 35 +++++ > tools/testing/selftests/arm64/pauth/helper.h | 10 ++ > tools/testing/selftests/arm64/pauth/pac.c | 148 ++++++++++++++++++ > 4 files changed, 197 insertions(+) > create mode 100644 tools/testing/selftests/arm64/pauth/exec_target.c > > diff --git a/tools/testing/selftests/arm64/pauth/Makefile b/tools/testing/selftests/arm64/pauth/Makefile > index a017d1c8dd58..2e237b21ccf6 100644 > --- a/tools/testing/selftests/arm64/pauth/Makefile > +++ b/tools/testing/selftests/arm64/pauth/Makefile > @@ -5,6 +5,7 @@ CFLAGS += -mbranch-protection=pac-ret > > TEST_GEN_PROGS := pac > TEST_GEN_FILES := pac_corruptor.o helper.o > +TEST_GEN_PROGS_EXTENDED := exec_target > > include ../../lib.mk > > @@ -20,6 +21,9 @@ $(OUTPUT)/helper.o: helper.c > # greater, gcc emits pac* instructions which are not in HINT NOP space, > # preventing the tests from occurring at all. Compile for ARMv8.2 so tests can > # run on earlier targets and print a meaningful error messages > +$(OUTPUT)/exec_target: exec_target.c $(OUTPUT)/helper.o > + $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a > + > $(OUTPUT)/pac: pac.c $(OUTPUT)/pac_corruptor.o $(OUTPUT)/helper.o > $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a > > diff --git a/tools/testing/selftests/arm64/pauth/exec_target.c b/tools/testing/selftests/arm64/pauth/exec_target.c > new file mode 100644 > index 000000000000..07addef5a1d7 > --- /dev/null > +++ b/tools/testing/selftests/arm64/pauth/exec_target.c > @@ -0,0 +1,35 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (C) 2020 ARM Limited > + > +#include > +#include > +#include > + > +#include "helper.h" > + > + > +int main(void) > +{ > + struct signatures signed_vals; > + unsigned long hwcaps; > + size_t val; > + > + fread(&val, sizeof(size_t), 1, stdin); > + > + /* don't try to execute illegal (unimplemented) instructions) caller > + * should have checked this and keep worker simple > + */ > + hwcaps = getauxval(AT_HWCAP); > + > + if (hwcaps & HWCAP_PACA) { > + signed_vals.keyia = keyia_sign(val); > + signed_vals.keyib = keyib_sign(val); > + signed_vals.keyda = keyda_sign(val); > + signed_vals.keydb = keydb_sign(val); > + } > + signed_vals.keyg = (hwcaps & HWCAP_PACG) ? keyg_sign(val) : 0; > + > + fwrite(&signed_vals, sizeof(struct signatures), 1, stdout); > + > + return 0; > +} > diff --git a/tools/testing/selftests/arm64/pauth/helper.h b/tools/testing/selftests/arm64/pauth/helper.h > index b3cf709e249d..fceaa1e4824a 100644 > --- a/tools/testing/selftests/arm64/pauth/helper.h > +++ b/tools/testing/selftests/arm64/pauth/helper.h > @@ -6,6 +6,16 @@ > > #include > > +#define NKEYS 5 > + > + > +struct signatures { > + size_t keyia; > + size_t keyib; > + size_t keyda; > + size_t keydb; > + size_t keyg; > +}; > > void pac_corruptor(void); > > diff --git a/tools/testing/selftests/arm64/pauth/pac.c b/tools/testing/selftests/arm64/pauth/pac.c > index cdbffa8bf61e..16dea47b11c7 100644 > --- a/tools/testing/selftests/arm64/pauth/pac.c > +++ b/tools/testing/selftests/arm64/pauth/pac.c > @@ -2,6 +2,8 @@ > // Copyright (C) 2020 ARM Limited > > #include > +#include > +#include > #include > > #include "../../kselftest_harness.h" > @@ -33,6 +35,117 @@ do { \ > } while (0) > > > +void sign_specific(struct signatures *sign, size_t val) > +{ > + sign->keyia = keyia_sign(val); > + sign->keyib = keyib_sign(val); > + sign->keyda = keyda_sign(val); > + sign->keydb = keydb_sign(val); > +} > + > +void sign_all(struct signatures *sign, size_t val) > +{ > + sign->keyia = keyia_sign(val); > + sign->keyib = keyib_sign(val); > + sign->keyda = keyda_sign(val); > + sign->keydb = keydb_sign(val); > + sign->keyg = keyg_sign(val); > +} > + > +int are_same(struct signatures *old, struct signatures *new, int nkeys) > +{ > + int res = 0; > + > + res |= old->keyia == new->keyia; > + res |= old->keyib == new->keyib; > + res |= old->keyda == new->keyda; > + res |= old->keydb == new->keydb; > + if (nkeys == NKEYS) > + res |= old->keyg == new->keyg; > + > + return res; > +} > + > +int exec_sign_all(struct signatures *signed_vals, size_t val) > +{ Could popen(3) be used here? Fork-and-exec is notoriously fiddly, so it's preferable to use a library function to do it where applicable. [...] Cheers ---Dave _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel