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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /tools/testing/selftests/arm64/pauth
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/arm64/pauth')
-rw-r--r--tools/testing/selftests/arm64/pauth/.gitignore2
-rw-r--r--tools/testing/selftests/arm64/pauth/Makefile39
-rw-r--r--tools/testing/selftests/arm64/pauth/exec_target.c34
-rw-r--r--tools/testing/selftests/arm64/pauth/helper.c39
-rw-r--r--tools/testing/selftests/arm64/pauth/helper.h28
-rw-r--r--tools/testing/selftests/arm64/pauth/pac.c370
-rw-r--r--tools/testing/selftests/arm64/pauth/pac_corruptor.S19
7 files changed, 531 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/pauth/.gitignore b/tools/testing/selftests/arm64/pauth/.gitignore
new file mode 100644
index 000000000..155137d92
--- /dev/null
+++ b/tools/testing/selftests/arm64/pauth/.gitignore
@@ -0,0 +1,2 @@
+exec_target
+pac
diff --git a/tools/testing/selftests/arm64/pauth/Makefile b/tools/testing/selftests/arm64/pauth/Makefile
new file mode 100644
index 000000000..72e290b0b
--- /dev/null
+++ b/tools/testing/selftests/arm64/pauth/Makefile
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020 ARM Limited
+
+# preserve CC value from top level Makefile
+ifeq ($(CC),cc)
+CC := $(CROSS_COMPILE)gcc
+endif
+
+CFLAGS += -mbranch-protection=pac-ret
+# check if the compiler supports ARMv8.3 and branch protection with PAuth
+pauth_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.3-a -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi)
+
+ifeq ($(pauth_cc_support),1)
+TEST_GEN_PROGS := pac
+TEST_GEN_FILES := pac_corruptor.o helper.o
+TEST_GEN_PROGS_EXTENDED := exec_target
+endif
+
+include ../../lib.mk
+
+ifeq ($(pauth_cc_support),1)
+# pac* and aut* instructions are not available on architectures berfore
+# ARMv8.3. Therefore target ARMv8.3 wherever they are used directly
+$(OUTPUT)/pac_corruptor.o: pac_corruptor.S
+ $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a
+
+$(OUTPUT)/helper.o: helper.c
+ $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a
+
+# when -mbranch-protection is enabled and the target architecture is ARMv8.3 or
+# greater, gcc emits pac* instructions which are not in HINT NOP space,
+# preventing the tests from occurring at all. Compile for ARMv8.2 so tests can
+# run on earlier targets and print a meaningful error messages
+$(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
+endif
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 000000000..4435600ca
--- /dev/null
+++ b/tools/testing/selftests/arm64/pauth/exec_target.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020 ARM Limited
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/auxv.h>
+
+#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.c b/tools/testing/selftests/arm64/pauth/helper.c
new file mode 100644
index 000000000..2c201e7d0
--- /dev/null
+++ b/tools/testing/selftests/arm64/pauth/helper.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020 ARM Limited
+
+#include "helper.h"
+
+size_t keyia_sign(size_t ptr)
+{
+ asm volatile("paciza %0" : "+r" (ptr));
+ return ptr;
+}
+
+size_t keyib_sign(size_t ptr)
+{
+ asm volatile("pacizb %0" : "+r" (ptr));
+ return ptr;
+}
+
+size_t keyda_sign(size_t ptr)
+{
+ asm volatile("pacdza %0" : "+r" (ptr));
+ return ptr;
+}
+
+size_t keydb_sign(size_t ptr)
+{
+ asm volatile("pacdzb %0" : "+r" (ptr));
+ return ptr;
+}
+
+size_t keyg_sign(size_t ptr)
+{
+ /* output is encoded in the upper 32 bits */
+ size_t dest = 0;
+ size_t modifier = 0;
+
+ asm volatile("pacga %0, %1, %2" : "=r" (dest) : "r" (ptr), "r" (modifier));
+
+ return dest;
+}
diff --git a/tools/testing/selftests/arm64/pauth/helper.h b/tools/testing/selftests/arm64/pauth/helper.h
new file mode 100644
index 000000000..652496c7b
--- /dev/null
+++ b/tools/testing/selftests/arm64/pauth/helper.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2020 ARM Limited */
+
+#ifndef _HELPER_H_
+#define _HELPER_H_
+
+#include <stdlib.h>
+
+#define NKEYS 5
+
+struct signatures {
+ size_t keyia;
+ size_t keyib;
+ size_t keyda;
+ size_t keydb;
+ size_t keyg;
+};
+
+void pac_corruptor(void);
+
+/* PAuth sign a value with key ia and modifier value 0 */
+size_t keyia_sign(size_t val);
+size_t keyib_sign(size_t val);
+size_t keyda_sign(size_t val);
+size_t keydb_sign(size_t val);
+size_t keyg_sign(size_t val);
+
+#endif
diff --git a/tools/testing/selftests/arm64/pauth/pac.c b/tools/testing/selftests/arm64/pauth/pac.c
new file mode 100644
index 000000000..b743daa77
--- /dev/null
+++ b/tools/testing/selftests/arm64/pauth/pac.c
@@ -0,0 +1,370 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020 ARM Limited
+
+#define _GNU_SOURCE
+
+#include <sys/auxv.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <setjmp.h>
+#include <sched.h>
+
+#include "../../kselftest_harness.h"
+#include "helper.h"
+
+#define PAC_COLLISION_ATTEMPTS 10
+/*
+ * The kernel sets TBID by default. So bits 55 and above should remain
+ * untouched no matter what.
+ * The VA space size is 48 bits. Bigger is opt-in.
+ */
+#define PAC_MASK (~0xff80ffffffffffff)
+#define ARBITRARY_VALUE (0x1234)
+#define ASSERT_PAUTH_ENABLED() \
+do { \
+ unsigned long hwcaps = getauxval(AT_HWCAP); \
+ /* data key instructions are not in NOP space. This prevents a SIGILL */ \
+ if (!(hwcaps & HWCAP_PACA)) \
+ SKIP(return, "PAUTH not enabled"); \
+} while (0)
+#define ASSERT_GENERIC_PAUTH_ENABLED() \
+do { \
+ unsigned long hwcaps = getauxval(AT_HWCAP); \
+ /* generic key instructions are not in NOP space. This prevents a SIGILL */ \
+ if (!(hwcaps & HWCAP_PACG)) \
+ SKIP(return, "Generic PAUTH not enabled"); \
+} 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 n_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 n_same_single_set(struct signatures *sign, int nkeys)
+{
+ size_t vals[nkeys];
+ int same = 0;
+
+ vals[0] = sign->keyia & PAC_MASK;
+ vals[1] = sign->keyib & PAC_MASK;
+ vals[2] = sign->keyda & PAC_MASK;
+ vals[3] = sign->keydb & PAC_MASK;
+
+ if (nkeys >= 4)
+ vals[4] = sign->keyg & PAC_MASK;
+
+ for (int i = 0; i < nkeys - 1; i++) {
+ for (int j = i + 1; j < nkeys; j++) {
+ if (vals[i] == vals[j])
+ same += 1;
+ }
+ }
+ return same;
+}
+
+int exec_sign_all(struct signatures *signed_vals, size_t val)
+{
+ int new_stdin[2];
+ int new_stdout[2];
+ int status;
+ int i;
+ ssize_t ret;
+ pid_t pid;
+ cpu_set_t mask;
+
+ ret = pipe(new_stdin);
+ if (ret == -1) {
+ perror("pipe returned error");
+ return -1;
+ }
+
+ ret = pipe(new_stdout);
+ if (ret == -1) {
+ perror("pipe returned error");
+ return -1;
+ }
+
+ /*
+ * pin this process and all its children to a single CPU, so it can also
+ * guarantee a context switch with its child
+ */
+ sched_getaffinity(0, sizeof(mask), &mask);
+
+ for (i = 0; i < sizeof(cpu_set_t); i++)
+ if (CPU_ISSET(i, &mask))
+ break;
+
+ CPU_ZERO(&mask);
+ CPU_SET(i, &mask);
+ sched_setaffinity(0, sizeof(mask), &mask);
+
+ pid = fork();
+ // child
+ if (pid == 0) {
+ dup2(new_stdin[0], STDIN_FILENO);
+ if (ret == -1) {
+ perror("dup2 returned error");
+ exit(1);
+ }
+
+ dup2(new_stdout[1], STDOUT_FILENO);
+ if (ret == -1) {
+ perror("dup2 returned error");
+ exit(1);
+ }
+
+ close(new_stdin[0]);
+ close(new_stdin[1]);
+ close(new_stdout[0]);
+ close(new_stdout[1]);
+
+ ret = execl("exec_target", "exec_target", (char *)NULL);
+ if (ret == -1) {
+ perror("exec returned error");
+ exit(1);
+ }
+ }
+
+ close(new_stdin[0]);
+ close(new_stdout[1]);
+
+ ret = write(new_stdin[1], &val, sizeof(size_t));
+ if (ret == -1) {
+ perror("write returned error");
+ return -1;
+ }
+
+ /*
+ * wait for the worker to finish, so that read() reads all data
+ * will also context switch with worker so that this function can be used
+ * for context switch tests
+ */
+ waitpid(pid, &status, 0);
+ if (WIFEXITED(status) == 0) {
+ fprintf(stderr, "worker exited unexpectedly\n");
+ return -1;
+ }
+ if (WEXITSTATUS(status) != 0) {
+ fprintf(stderr, "worker exited with error\n");
+ return -1;
+ }
+
+ ret = read(new_stdout[0], signed_vals, sizeof(struct signatures));
+ if (ret == -1) {
+ perror("read returned error");
+ return -1;
+ }
+
+ return 0;
+}
+
+sigjmp_buf jmpbuf;
+void pac_signal_handler(int signum, siginfo_t *si, void *uc)
+{
+ if (signum == SIGSEGV || signum == SIGILL)
+ siglongjmp(jmpbuf, 1);
+}
+
+/* check that a corrupted PAC results in SIGSEGV or SIGILL */
+TEST(corrupt_pac)
+{
+ struct sigaction sa;
+
+ ASSERT_PAUTH_ENABLED();
+ if (sigsetjmp(jmpbuf, 1) == 0) {
+ sa.sa_sigaction = pac_signal_handler;
+ sa.sa_flags = SA_SIGINFO | SA_RESETHAND;
+ sigemptyset(&sa.sa_mask);
+
+ sigaction(SIGSEGV, &sa, NULL);
+ sigaction(SIGILL, &sa, NULL);
+
+ pac_corruptor();
+ ASSERT_TRUE(0) TH_LOG("SIGSEGV/SIGILL signal did not occur");
+ }
+}
+
+/*
+ * There are no separate pac* and aut* controls so checking only the pac*
+ * instructions is sufficient
+ */
+TEST(pac_instructions_not_nop)
+{
+ size_t keyia = 0;
+ size_t keyib = 0;
+ size_t keyda = 0;
+ size_t keydb = 0;
+
+ ASSERT_PAUTH_ENABLED();
+
+ for (int i = 0; i < PAC_COLLISION_ATTEMPTS; i++) {
+ keyia |= keyia_sign(i) & PAC_MASK;
+ keyib |= keyib_sign(i) & PAC_MASK;
+ keyda |= keyda_sign(i) & PAC_MASK;
+ keydb |= keydb_sign(i) & PAC_MASK;
+ }
+
+ ASSERT_NE(0, keyia) TH_LOG("keyia instructions did nothing");
+ ASSERT_NE(0, keyib) TH_LOG("keyib instructions did nothing");
+ ASSERT_NE(0, keyda) TH_LOG("keyda instructions did nothing");
+ ASSERT_NE(0, keydb) TH_LOG("keydb instructions did nothing");
+}
+
+TEST(pac_instructions_not_nop_generic)
+{
+ size_t keyg = 0;
+
+ ASSERT_GENERIC_PAUTH_ENABLED();
+
+ for (int i = 0; i < PAC_COLLISION_ATTEMPTS; i++)
+ keyg |= keyg_sign(i) & PAC_MASK;
+
+ ASSERT_NE(0, keyg) TH_LOG("keyg instructions did nothing");
+}
+
+TEST(single_thread_different_keys)
+{
+ int same = 10;
+ int nkeys = NKEYS;
+ int tmp;
+ struct signatures signed_vals;
+ unsigned long hwcaps = getauxval(AT_HWCAP);
+
+ /* generic and data key instructions are not in NOP space. This prevents a SIGILL */
+ ASSERT_PAUTH_ENABLED();
+ if (!(hwcaps & HWCAP_PACG)) {
+ TH_LOG("WARNING: Generic PAUTH not enabled. Skipping generic key checks");
+ nkeys = NKEYS - 1;
+ }
+
+ /*
+ * In Linux the PAC field can be up to 7 bits wide. Even if keys are
+ * different, there is about 5% chance for PACs to collide with
+ * different addresses. This chance rapidly increases with fewer bits
+ * allocated for the PAC (e.g. wider address). A comparison of the keys
+ * directly will be more reliable.
+ * All signed values need to be different at least once out of n
+ * attempts to be certain that the keys are different
+ */
+ for (int i = 0; i < PAC_COLLISION_ATTEMPTS; i++) {
+ if (nkeys == NKEYS)
+ sign_all(&signed_vals, i);
+ else
+ sign_specific(&signed_vals, i);
+
+ tmp = n_same_single_set(&signed_vals, nkeys);
+ if (tmp < same)
+ same = tmp;
+ }
+
+ ASSERT_EQ(0, same) TH_LOG("%d keys clashed every time", same);
+}
+
+/*
+ * fork() does not change keys. Only exec() does so call a worker program.
+ * Its only job is to sign a value and report back the resutls
+ */
+TEST(exec_changed_keys)
+{
+ struct signatures new_keys;
+ struct signatures old_keys;
+ int ret;
+ int same = 10;
+ int nkeys = NKEYS;
+ unsigned long hwcaps = getauxval(AT_HWCAP);
+
+ /* generic and data key instructions are not in NOP space. This prevents a SIGILL */
+ ASSERT_PAUTH_ENABLED();
+ if (!(hwcaps & HWCAP_PACG)) {
+ TH_LOG("WARNING: Generic PAUTH not enabled. Skipping generic key checks");
+ nkeys = NKEYS - 1;
+ }
+
+ for (int i = 0; i < PAC_COLLISION_ATTEMPTS; i++) {
+ ret = exec_sign_all(&new_keys, i);
+ ASSERT_EQ(0, ret) TH_LOG("failed to run worker");
+
+ if (nkeys == NKEYS)
+ sign_all(&old_keys, i);
+ else
+ sign_specific(&old_keys, i);
+
+ ret = n_same(&old_keys, &new_keys, nkeys);
+ if (ret < same)
+ same = ret;
+ }
+
+ ASSERT_EQ(0, same) TH_LOG("exec() did not change %d keys", same);
+}
+
+TEST(context_switch_keep_keys)
+{
+ int ret;
+ struct signatures trash;
+ struct signatures before;
+ struct signatures after;
+
+ ASSERT_PAUTH_ENABLED();
+
+ sign_specific(&before, ARBITRARY_VALUE);
+
+ /* will context switch with a process with different keys at least once */
+ ret = exec_sign_all(&trash, ARBITRARY_VALUE);
+ ASSERT_EQ(0, ret) TH_LOG("failed to run worker");
+
+ sign_specific(&after, ARBITRARY_VALUE);
+
+ ASSERT_EQ(before.keyia, after.keyia) TH_LOG("keyia changed after context switching");
+ ASSERT_EQ(before.keyib, after.keyib) TH_LOG("keyib changed after context switching");
+ ASSERT_EQ(before.keyda, after.keyda) TH_LOG("keyda changed after context switching");
+ ASSERT_EQ(before.keydb, after.keydb) TH_LOG("keydb changed after context switching");
+}
+
+TEST(context_switch_keep_keys_generic)
+{
+ int ret;
+ struct signatures trash;
+ size_t before;
+ size_t after;
+
+ ASSERT_GENERIC_PAUTH_ENABLED();
+
+ before = keyg_sign(ARBITRARY_VALUE);
+
+ /* will context switch with a process with different keys at least once */
+ ret = exec_sign_all(&trash, ARBITRARY_VALUE);
+ ASSERT_EQ(0, ret) TH_LOG("failed to run worker");
+
+ after = keyg_sign(ARBITRARY_VALUE);
+
+ ASSERT_EQ(before, after) TH_LOG("keyg changed after context switching");
+}
+
+TEST_HARNESS_MAIN
diff --git a/tools/testing/selftests/arm64/pauth/pac_corruptor.S b/tools/testing/selftests/arm64/pauth/pac_corruptor.S
new file mode 100644
index 000000000..aa6588050
--- /dev/null
+++ b/tools/testing/selftests/arm64/pauth/pac_corruptor.S
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2020 ARM Limited */
+
+.global pac_corruptor
+
+.text
+/*
+ * Corrupting a single bit of the PAC ensures the authentication will fail. It
+ * also guarantees no possible collision. TCR_EL1.TBI0 is set by default so no
+ * top byte PAC is tested
+ */
+ pac_corruptor:
+ paciasp
+
+ /* corrupt the top bit of the PAC */
+ eor lr, lr, #1 << 53
+
+ autiasp
+ ret