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-rw-r--r--lib/Kconfig.debug66
-rw-r--r--lib/Makefile4
-rw-r--r--lib/cpumask_kunit.c (renamed from lib/test_cpumask.c)52
-rw-r--r--lib/crypto/Kconfig1
-rw-r--r--lib/fortify_kunit.c76
-rw-r--r--lib/is_signed_type_kunit.c53
-rw-r--r--lib/kunit/Kconfig11
-rw-r--r--lib/kunit/executor.c4
-rw-r--r--lib/kunit/test.c24
-rw-r--r--lib/memcpy_kunit.c59
-rw-r--r--lib/nlattr.c31
-rw-r--r--lib/once.c30
-rw-r--r--lib/overflow_kunit.c179
-rw-r--r--lib/ratelimit.c12
-rw-r--r--lib/stackinit_kunit.c2
-rw-r--r--lib/string_helpers.c44
-rw-r--r--lib/vsprintf.c13
17 files changed, 567 insertions, 94 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 072e4b289c13..f473f7d8a0a2 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -264,8 +264,10 @@ config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
config DEBUG_INFO_DWARF4
bool "Generate DWARF Version 4 debuginfo"
select DEBUG_INFO
+ depends on !CC_IS_CLANG || (CC_IS_CLANG && (AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)))
help
- Generate DWARF v4 debug info. This requires gcc 4.5+ and gdb 7.0+.
+ Generate DWARF v4 debug info. This requires gcc 4.5+, binutils 2.35.2
+ if using clang without clang's integrated assembler, and gdb 7.0+.
If you have consumers of DWARF debug info that are not ready for
newer revisions of DWARF, you may wish to choose this or have your
@@ -2029,13 +2031,16 @@ config LKDTM
Documentation on how to use the module can be found in
Documentation/fault-injection/provoke-crashes.rst
-config TEST_CPUMASK
- tristate "cpumask tests" if !KUNIT_ALL_TESTS
+config CPUMASK_KUNIT_TEST
+ tristate "KUnit test for cpumask" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
Enable to turn on cpumask tests, running at boot or module load time.
+ For more information on KUnit and unit tests in general, please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
If unsure, say N.
config TEST_LIST_SORT
@@ -2506,6 +2511,18 @@ config MEMCPY_KUNIT_TEST
If unsure, say N.
+config IS_SIGNED_TYPE_KUNIT_TEST
+ tristate "Test is_signed_type() macro" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Builds unit tests for the is_signed_type() macro.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
config OVERFLOW_KUNIT_TEST
tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS
depends on KUNIT
@@ -2530,6 +2547,15 @@ config STACKINIT_KUNIT_TEST
CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF,
or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL.
+config FORTIFY_KUNIT_TEST
+ tristate "Test fortified str*() and mem*() function internals at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT && FORTIFY_SOURCE
+ default KUNIT_ALL_TESTS
+ help
+ Builds unit tests for checking internals of FORTIFY_SOURCE as used
+ by the str*() and mem*() family of functions. For testing runtime
+ traps of FORTIFY_SOURCE, see LKDTM's "FORTIFY_*" tests.
+
config TEST_UDELAY
tristate "udelay test driver"
help
@@ -2705,6 +2731,40 @@ config HYPERV_TESTING
endmenu # "Kernel Testing and Coverage"
+menu "Rust hacking"
+
+config RUST_DEBUG_ASSERTIONS
+ bool "Debug assertions"
+ depends on RUST
+ help
+ Enables rustc's `-Cdebug-assertions` codegen option.
+
+ This flag lets you turn `cfg(debug_assertions)` conditional
+ compilation on or off. This can be used to enable extra debugging
+ code in development but not in production. For example, it controls
+ the behavior of the standard library's `debug_assert!` macro.
+
+ Note that this will apply to all Rust code, including `core`.
+
+ If unsure, say N.
+
+config RUST_OVERFLOW_CHECKS
+ bool "Overflow checks"
+ default y
+ depends on RUST
+ help
+ Enables rustc's `-Coverflow-checks` codegen option.
+
+ This flag allows you to control the behavior of runtime integer
+ overflow. When overflow-checks are enabled, a Rust panic will occur
+ on overflow.
+
+ Note that this will apply to all Rust code, including `core`.
+
+ If unsure, say Y.
+
+endmenu # "Rust"
+
source "Documentation/Kconfig"
endmenu # Kernel hacking
diff --git a/lib/Makefile b/lib/Makefile
index 5927d7fa0806..7d7c9f67eff6 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -60,6 +60,7 @@ obj-$(CONFIG_TEST_BPF) += test_bpf.o
obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
obj-$(CONFIG_TEST_BITOPS) += test_bitops.o
CFLAGS_test_bitops.o += -Werror
+obj-$(CONFIG_CPUMASK_KUNIT_TEST) += cpumask_kunit.o
obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
obj-$(CONFIG_TEST_SIPHASH) += test_siphash.o
obj-$(CONFIG_HASH_KUNIT_TEST) += test_hash.o
@@ -100,7 +101,6 @@ obj-$(CONFIG_TEST_HMM) += test_hmm.o
obj-$(CONFIG_TEST_FREE_PAGES) += test_free_pages.o
obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
obj-$(CONFIG_TEST_REF_TRACKER) += test_ref_tracker.o
-obj-$(CONFIG_TEST_CPUMASK) += test_cpumask.o
CFLAGS_test_fprobe.o += $(CC_FLAGS_FTRACE)
obj-$(CONFIG_FPROBE_SANITY_TEST) += test_fprobe.o
#
@@ -377,9 +377,11 @@ obj-$(CONFIG_BITS_TEST) += test_bits.o
obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o
obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o
+obj-$(CONFIG_IS_SIGNED_TYPE_KUNIT_TEST) += is_signed_type_kunit.o
obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o
CFLAGS_stackinit_kunit.o += $(call cc-disable-warning, switch-unreachable)
obj-$(CONFIG_STACKINIT_KUNIT_TEST) += stackinit_kunit.o
+obj-$(CONFIG_FORTIFY_KUNIT_TEST) += fortify_kunit.o
obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o
diff --git a/lib/test_cpumask.c b/lib/cpumask_kunit.c
index a31a1622f1f6..ecbeec72221e 100644
--- a/lib/test_cpumask.c
+++ b/lib/cpumask_kunit.c
@@ -9,6 +9,10 @@
#include <linux/cpu.h>
#include <linux/cpumask.h>
+#define MASK_MSG(m) \
+ "%s contains %sCPUs %*pbl", #m, (cpumask_weight(m) ? "" : "no "), \
+ nr_cpumask_bits, cpumask_bits(m)
+
#define EXPECT_FOR_EACH_CPU_EQ(test, mask) \
do { \
const cpumask_t *m = (mask); \
@@ -16,7 +20,7 @@
int cpu, iter = 0; \
for_each_cpu(cpu, m) \
iter++; \
- KUNIT_EXPECT_EQ((test), mask_weight, iter); \
+ KUNIT_EXPECT_EQ_MSG((test), mask_weight, iter, MASK_MSG(mask)); \
} while (0)
#define EXPECT_FOR_EACH_CPU_NOT_EQ(test, mask) \
@@ -26,7 +30,7 @@
int cpu, iter = 0; \
for_each_cpu_not(cpu, m) \
iter++; \
- KUNIT_EXPECT_EQ((test), nr_cpu_ids - mask_weight, iter); \
+ KUNIT_EXPECT_EQ_MSG((test), nr_cpu_ids - mask_weight, iter, MASK_MSG(mask)); \
} while (0)
#define EXPECT_FOR_EACH_CPU_WRAP_EQ(test, mask) \
@@ -36,7 +40,7 @@
int cpu, iter = 0; \
for_each_cpu_wrap(cpu, m, nr_cpu_ids / 2) \
iter++; \
- KUNIT_EXPECT_EQ((test), mask_weight, iter); \
+ KUNIT_EXPECT_EQ_MSG((test), mask_weight, iter, MASK_MSG(mask)); \
} while (0)
#define EXPECT_FOR_EACH_CPU_BUILTIN_EQ(test, name) \
@@ -45,7 +49,7 @@
int cpu, iter = 0; \
for_each_##name##_cpu(cpu) \
iter++; \
- KUNIT_EXPECT_EQ((test), mask_weight, iter); \
+ KUNIT_EXPECT_EQ_MSG((test), mask_weight, iter, MASK_MSG(cpu_##name##_mask)); \
} while (0)
static cpumask_t mask_empty;
@@ -53,37 +57,43 @@ static cpumask_t mask_all;
static void test_cpumask_weight(struct kunit *test)
{
- KUNIT_EXPECT_TRUE(test, cpumask_empty(&mask_empty));
- KUNIT_EXPECT_TRUE(test, cpumask_full(cpu_possible_mask));
- KUNIT_EXPECT_TRUE(test, cpumask_full(&mask_all));
+ KUNIT_EXPECT_TRUE_MSG(test, cpumask_empty(&mask_empty), MASK_MSG(&mask_empty));
+ KUNIT_EXPECT_TRUE_MSG(test, cpumask_full(&mask_all), MASK_MSG(&mask_all));
- KUNIT_EXPECT_EQ(test, 0, cpumask_weight(&mask_empty));
- KUNIT_EXPECT_EQ(test, nr_cpu_ids, cpumask_weight(cpu_possible_mask));
- KUNIT_EXPECT_EQ(test, nr_cpumask_bits, cpumask_weight(&mask_all));
+ KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_weight(&mask_empty), MASK_MSG(&mask_empty));
+ KUNIT_EXPECT_EQ_MSG(test, nr_cpu_ids, cpumask_weight(cpu_possible_mask),
+ MASK_MSG(cpu_possible_mask));
+ KUNIT_EXPECT_EQ_MSG(test, nr_cpumask_bits, cpumask_weight(&mask_all), MASK_MSG(&mask_all));
}
static void test_cpumask_first(struct kunit *test)
{
- KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_first(&mask_empty));
- KUNIT_EXPECT_EQ(test, 0, cpumask_first(cpu_possible_mask));
+ KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_first(&mask_empty), MASK_MSG(&mask_empty));
+ KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_first(cpu_possible_mask), MASK_MSG(cpu_possible_mask));
- KUNIT_EXPECT_EQ(test, 0, cpumask_first_zero(&mask_empty));
- KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_first_zero(cpu_possible_mask));
+ KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_first_zero(&mask_empty), MASK_MSG(&mask_empty));
+ KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_first_zero(cpu_possible_mask),
+ MASK_MSG(cpu_possible_mask));
}
static void test_cpumask_last(struct kunit *test)
{
- KUNIT_EXPECT_LE(test, nr_cpumask_bits, cpumask_last(&mask_empty));
- KUNIT_EXPECT_EQ(test, nr_cpumask_bits - 1, cpumask_last(cpu_possible_mask));
+ KUNIT_EXPECT_LE_MSG(test, nr_cpumask_bits, cpumask_last(&mask_empty),
+ MASK_MSG(&mask_empty));
+ KUNIT_EXPECT_EQ_MSG(test, nr_cpu_ids - 1, cpumask_last(cpu_possible_mask),
+ MASK_MSG(cpu_possible_mask));
}
static void test_cpumask_next(struct kunit *test)
{
- KUNIT_EXPECT_EQ(test, 0, cpumask_next_zero(-1, &mask_empty));
- KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_next_zero(-1, cpu_possible_mask));
-
- KUNIT_EXPECT_LE(test, nr_cpu_ids, cpumask_next(-1, &mask_empty));
- KUNIT_EXPECT_EQ(test, 0, cpumask_next(-1, cpu_possible_mask));
+ KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_next_zero(-1, &mask_empty), MASK_MSG(&mask_empty));
+ KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_next_zero(-1, cpu_possible_mask),
+ MASK_MSG(cpu_possible_mask));
+
+ KUNIT_EXPECT_LE_MSG(test, nr_cpu_ids, cpumask_next(-1, &mask_empty),
+ MASK_MSG(&mask_empty));
+ KUNIT_EXPECT_EQ_MSG(test, 0, cpumask_next(-1, cpu_possible_mask),
+ MASK_MSG(cpu_possible_mask));
}
static void test_cpumask_iterators(struct kunit *test)
diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig
index 9ff549f63540..47816af9a9d7 100644
--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -33,7 +33,6 @@ config CRYPTO_ARCH_HAVE_LIB_CHACHA
config CRYPTO_LIB_CHACHA_GENERIC
tristate
- select XOR_BLOCKS
help
This symbol can be depended upon by arch implementations of the
ChaCha library interface that require the generic code as a
diff --git a/lib/fortify_kunit.c b/lib/fortify_kunit.c
new file mode 100644
index 000000000000..409af07f340a
--- /dev/null
+++ b/lib/fortify_kunit.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Runtime test cases for CONFIG_FORTIFY_SOURCE that aren't expected to
+ * Oops the kernel on success. (For those, see drivers/misc/lkdtm/fortify.c)
+ *
+ * For corner cases with UBSAN, try testing with:
+ *
+ * ./tools/testing/kunit/kunit.py run --arch=x86_64 \
+ * --kconfig_add CONFIG_FORTIFY_SOURCE=y \
+ * --kconfig_add CONFIG_UBSAN=y \
+ * --kconfig_add CONFIG_UBSAN_TRAP=y \
+ * --kconfig_add CONFIG_UBSAN_BOUNDS=y \
+ * --kconfig_add CONFIG_UBSAN_LOCAL_BOUNDS=y \
+ * --make_options LLVM=1 fortify
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <kunit/test.h>
+#include <linux/string.h>
+
+static const char array_of_10[] = "this is 10";
+static const char *ptr_of_11 = "this is 11!";
+static char array_unknown[] = "compiler thinks I might change";
+
+static void known_sizes_test(struct kunit *test)
+{
+ KUNIT_EXPECT_EQ(test, __compiletime_strlen("88888888"), 8);
+ KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_of_10), 10);
+ KUNIT_EXPECT_EQ(test, __compiletime_strlen(ptr_of_11), 11);
+
+ KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_unknown), SIZE_MAX);
+ /* Externally defined and dynamically sized string pointer: */
+ KUNIT_EXPECT_EQ(test, __compiletime_strlen(test->name), SIZE_MAX);
+}
+
+/* This is volatile so the optimizer can't perform DCE below. */
+static volatile int pick;
+
+/* Not inline to keep optimizer from figuring out which string we want. */
+static noinline size_t want_minus_one(int pick)
+{
+ const char *str;
+
+ switch (pick) {
+ case 1:
+ str = "4444";
+ break;
+ case 2:
+ str = "333";
+ break;
+ default:
+ str = "1";
+ break;
+ }
+ return __compiletime_strlen(str);
+}
+
+static void control_flow_split_test(struct kunit *test)
+{
+ KUNIT_EXPECT_EQ(test, want_minus_one(pick), SIZE_MAX);
+}
+
+static struct kunit_case fortify_test_cases[] = {
+ KUNIT_CASE(known_sizes_test),
+ KUNIT_CASE(control_flow_split_test),
+ {}
+};
+
+static struct kunit_suite fortify_test_suite = {
+ .name = "fortify",
+ .test_cases = fortify_test_cases,
+};
+
+kunit_test_suite(fortify_test_suite);
+
+MODULE_LICENSE("GPL");
diff --git a/lib/is_signed_type_kunit.c b/lib/is_signed_type_kunit.c
new file mode 100644
index 000000000000..207207522925
--- /dev/null
+++ b/lib/is_signed_type_kunit.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * ./tools/testing/kunit/kunit.py run is_signed_type [--raw_output]
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <kunit/test.h>
+#include <linux/compiler.h>
+
+enum unsigned_enum {
+ constant_a = 3,
+};
+
+enum signed_enum {
+ constant_b = -1,
+ constant_c = 2,
+};
+
+static void is_signed_type_test(struct kunit *test)
+{
+ KUNIT_EXPECT_EQ(test, is_signed_type(bool), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(signed char), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(unsigned char), false);
+#ifdef __CHAR_UNSIGNED__
+ KUNIT_EXPECT_EQ(test, is_signed_type(char), false);
+#else
+ KUNIT_EXPECT_EQ(test, is_signed_type(char), true);
+#endif
+ KUNIT_EXPECT_EQ(test, is_signed_type(int), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(unsigned int), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(long), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(unsigned long), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(long long), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(unsigned long long), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(enum unsigned_enum), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(enum signed_enum), true);
+ KUNIT_EXPECT_EQ(test, is_signed_type(void *), false);
+ KUNIT_EXPECT_EQ(test, is_signed_type(const char *), false);
+}
+
+static struct kunit_case is_signed_type_test_cases[] = {
+ KUNIT_CASE(is_signed_type_test),
+ {}
+};
+
+static struct kunit_suite is_signed_type_test_suite = {
+ .name = "is_signed_type",
+ .test_cases = is_signed_type_test_cases,
+};
+
+kunit_test_suite(is_signed_type_test_suite);
+
+MODULE_LICENSE("Dual MIT/GPL");
diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
index 0b5dfb001bac..626719b95bad 100644
--- a/lib/kunit/Kconfig
+++ b/lib/kunit/Kconfig
@@ -59,4 +59,15 @@ config KUNIT_ALL_TESTS
If unsure, say N.
+config KUNIT_DEFAULT_ENABLED
+ bool "Default value of kunit.enable"
+ default y
+ help
+ Sets the default value of kunit.enable. If set to N then KUnit
+ tests will not execute unless kunit.enable=1 is passed to the
+ kernel command line.
+
+ In most cases this should be left as Y. Only if additional opt-in
+ behavior is needed should this be set to N.
+
endif # KUNIT
diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
index 5e223327196a..9bbc422c284b 100644
--- a/lib/kunit/executor.c
+++ b/lib/kunit/executor.c
@@ -190,6 +190,10 @@ int kunit_run_all_tests(void)
{
struct suite_set suite_set = {__kunit_suites_start, __kunit_suites_end};
int err = 0;
+ if (!kunit_enabled()) {
+ pr_info("kunit: disabled\n");
+ goto out;
+ }
if (filter_glob_param) {
suite_set = kunit_filter_suites(&suite_set, filter_glob_param, &err);
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index b73d5bb5c473..1e54373309a4 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -55,6 +55,17 @@ EXPORT_SYMBOL_GPL(__kunit_fail_current_test);
#endif
/*
+ * Enable KUnit tests to run.
+ */
+#ifdef CONFIG_KUNIT_DEFAULT_ENABLED
+static bool enable_param = true;
+#else
+static bool enable_param;
+#endif
+module_param_named(enable, enable_param, bool, 0);
+MODULE_PARM_DESC(enable, "Enable KUnit tests");
+
+/*
* KUnit statistic mode:
* 0 - disabled
* 1 - only when there is more than one subtest
@@ -586,10 +597,20 @@ static void kunit_init_suite(struct kunit_suite *suite)
suite->suite_init_err = 0;
}
+bool kunit_enabled(void)
+{
+ return enable_param;
+}
+
int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_suites)
{
unsigned int i;
+ if (!kunit_enabled() && num_suites > 0) {
+ pr_info("kunit: disabled\n");
+ return 0;
+ }
+
for (i = 0; i < num_suites; i++) {
kunit_init_suite(suites[i]);
kunit_run_tests(suites[i]);
@@ -607,6 +628,9 @@ void __kunit_test_suites_exit(struct kunit_suite **suites, int num_suites)
{
unsigned int i;
+ if (!kunit_enabled())
+ return;
+
for (i = 0; i < num_suites; i++)
kunit_exit_suite(suites[i]);
diff --git a/lib/memcpy_kunit.c b/lib/memcpy_kunit.c
index 62f8ffcbbaa3..2b5cc70ac53f 100644
--- a/lib/memcpy_kunit.c
+++ b/lib/memcpy_kunit.c
@@ -29,9 +29,8 @@ struct some_bytes {
};
#define check(instance, v) do { \
- int i; \
BUILD_BUG_ON(sizeof(instance.data) != 32); \
- for (i = 0; i < sizeof(instance.data); i++) { \
+ for (size_t i = 0; i < sizeof(instance.data); i++) { \
KUNIT_ASSERT_EQ_MSG(test, instance.data[i], v, \
"line %d: '%s' not initialized to 0x%02x @ %d (saw 0x%02x)\n", \
__LINE__, #instance, v, i, instance.data[i]); \
@@ -39,9 +38,8 @@ struct some_bytes {
} while (0)
#define compare(name, one, two) do { \
- int i; \
BUILD_BUG_ON(sizeof(one) != sizeof(two)); \
- for (i = 0; i < sizeof(one); i++) { \
+ for (size_t i = 0; i < sizeof(one); i++) { \
KUNIT_EXPECT_EQ_MSG(test, one.data[i], two.data[i], \
"line %d: %s.data[%d] (0x%02x) != %s.data[%d] (0x%02x)\n", \
__LINE__, #one, i, one.data[i], #two, i, two.data[i]); \
@@ -272,10 +270,63 @@ static void memset_test(struct kunit *test)
#undef TEST_OP
}
+static void strtomem_test(struct kunit *test)
+{
+ static const char input[sizeof(unsigned long)] = "hi";
+ static const char truncate[] = "this is too long";
+ struct {
+ unsigned long canary1;
+ unsigned char output[sizeof(unsigned long)] __nonstring;
+ unsigned long canary2;
+ } wrap;
+
+ memset(&wrap, 0xFF, sizeof(wrap));
+ KUNIT_EXPECT_EQ_MSG(test, wrap.canary1, ULONG_MAX,
+ "bad initial canary value");
+ KUNIT_EXPECT_EQ_MSG(test, wrap.canary2, ULONG_MAX,
+ "bad initial canary value");
+
+ /* Check unpadded copy leaves surroundings untouched. */
+ strtomem(wrap.output, input);
+ KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
+ KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]);
+ KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]);
+ for (size_t i = 2; i < sizeof(wrap.output); i++)
+ KUNIT_EXPECT_EQ(test, wrap.output[i], 0xFF);
+ KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
+
+ /* Check truncated copy leaves surroundings untouched. */
+ memset(&wrap, 0xFF, sizeof(wrap));
+ strtomem(wrap.output, truncate);
+ KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
+ for (size_t i = 0; i < sizeof(wrap.output); i++)
+ KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]);
+ KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
+
+ /* Check padded copy leaves only string padded. */
+ memset(&wrap, 0xFF, sizeof(wrap));
+ strtomem_pad(wrap.output, input, 0xAA);
+ KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
+ KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]);
+ KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]);
+ for (size_t i = 2; i < sizeof(wrap.output); i++)
+ KUNIT_EXPECT_EQ(test, wrap.output[i], 0xAA);
+ KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
+
+ /* Check truncated padded copy has no padding. */
+ memset(&wrap, 0xFF, sizeof(wrap));
+ strtomem(wrap.output, truncate);
+ KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
+ for (size_t i = 0; i < sizeof(wrap.output); i++)
+ KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]);
+ KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
+}
+
static struct kunit_case memcpy_test_cases[] = {
KUNIT_CASE(memset_test),
KUNIT_CASE(memcpy_test),
KUNIT_CASE(memmove_test),
+ KUNIT_CASE(strtomem_test),
{}
};
diff --git a/lib/nlattr.c b/lib/nlattr.c
index 86029ad5ead4..40f22b177d69 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -159,6 +159,31 @@ void nla_get_range_unsigned(const struct nla_policy *pt,
}
}
+static u64 nla_get_attr_bo(const struct nla_policy *pt,
+ const struct nlattr *nla)
+{
+ switch (pt->type) {
+ case NLA_U16:
+ if (pt->network_byte_order)
+ return ntohs(nla_get_be16(nla));
+
+ return nla_get_u16(nla);
+ case NLA_U32:
+ if (pt->network_byte_order)
+ return ntohl(nla_get_be32(nla));
+
+ return nla_get_u32(nla);
+ case NLA_U64:
+ if (pt->network_byte_order)
+ return be64_to_cpu(nla_get_be64(nla));
+
+ return nla_get_u64(nla);
+ }
+
+ WARN_ON_ONCE(1);
+ return 0;
+}
+
static int nla_validate_range_unsigned(const struct nla_policy *pt,
const struct nlattr *nla,
struct netlink_ext_ack *extack,
@@ -172,12 +197,10 @@ static int nla_validate_range_unsigned(const struct nla_policy *pt,
value = nla_get_u8(nla);
break;
case NLA_U16:
- value = nla_get_u16(nla);
- break;
case NLA_U32:
- value = nla_get_u32(nla);
- break;
case NLA_U64:
+ value = nla_get_attr_bo(pt, nla);
+ break;
case NLA_MSECS:
value = nla_get_u64(nla);
break;
diff --git a/lib/once.c b/lib/once.c
index 59149bf3bfb4..2c306f0e891e 100644
--- a/lib/once.c
+++ b/lib/once.c
@@ -66,3 +66,33 @@ void __do_once_done(bool *done, struct static_key_true *once_key,
once_disable_jump(once_key, mod);
}
EXPORT_SYMBOL(__do_once_done);
+
+static DEFINE_MUTEX(once_mutex);
+
+bool __do_once_sleepable_start(bool *done)
+ __acquires(once_mutex)
+{
+ mutex_lock(&once_mutex);
+ if (*done) {
+ mutex_unlock(&once_mutex);
+ /* Keep sparse happy by restoring an even lock count on
+ * this mutex. In case we return here, we don't call into
+ * __do_once_done but return early in the DO_ONCE_SLEEPABLE() macro.
+ */
+ __acquire(once_mutex);
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL(__do_once_sleepable_start);
+
+void __do_once_sleepable_done(bool *done, struct static_key_true *once_key,
+ struct module *mod)
+ __releases(once_mutex)
+{
+ *done = true;
+ mutex_unlock(&once_mutex);
+ once_disable_jump(once_key, mod);
+}
+EXPORT_SYMBOL(__do_once_sleepable_done);
diff --git a/lib/overflow_kunit.c b/lib/overflow_kunit.c
index 7e3e43679b73..5369634701fa 100644
--- a/lib/overflow_kunit.c
+++ b/lib/overflow_kunit.c
@@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Test cases for arithmetic overflow checks. See:
- * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests
+ * "Running tests with kunit_tool" at Documentation/dev-tools/kunit/start.rst
* ./tools/testing/kunit/kunit.py run overflow [--raw_output]
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -16,12 +16,15 @@
#include <linux/types.h>
#include <linux/vmalloc.h>
-#define DEFINE_TEST_ARRAY(t) \
- static const struct test_ ## t { \
- t a, b; \
- t sum, diff, prod; \
- bool s_of, d_of, p_of; \
- } t ## _tests[]
+#define DEFINE_TEST_ARRAY_TYPED(t1, t2, t) \
+ static const struct test_ ## t1 ## _ ## t2 ## __ ## t { \
+ t1 a; \
+ t2 b; \
+ t sum, diff, prod; \
+ bool s_of, d_of, p_of; \
+ } t1 ## _ ## t2 ## __ ## t ## _tests[]
+
+#define DEFINE_TEST_ARRAY(t) DEFINE_TEST_ARRAY_TYPED(t, t, t)
DEFINE_TEST_ARRAY(u8) = {
{0, 0, 0, 0, 0, false, false, false},
@@ -222,21 +225,27 @@ DEFINE_TEST_ARRAY(s64) = {
};
#endif
-#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \
- t _r; \
- bool _of; \
- \
- _of = check_ ## op ## _overflow(a, b, &_r); \
- KUNIT_EXPECT_EQ_MSG(test, _of, of, \
+#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \
+ int _a_orig = a, _a_bump = a + 1; \
+ int _b_orig = b, _b_bump = b + 1; \
+ bool _of; \
+ t _r; \
+ \
+ _of = check_ ## op ## _overflow(a, b, &_r); \
+ KUNIT_EXPECT_EQ_MSG(test, _of, of, \
"expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \
- a, b, of ? "" : " not", #t); \
- KUNIT_EXPECT_EQ_MSG(test, _r, r, \
+ a, b, of ? "" : " not", #t); \
+ KUNIT_EXPECT_EQ_MSG(test, _r, r, \
"expected "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \
- a, b, r, _r, #t); \
+ a, b, r, _r, #t); \
+ /* Check for internal macro side-effects. */ \
+ _of = check_ ## op ## _overflow(_a_orig++, _b_orig++, &_r); \
+ KUNIT_EXPECT_EQ_MSG(test, _a_orig, _a_bump, "Unexpected " #op " macro side-effect!\n"); \
+ KUNIT_EXPECT_EQ_MSG(test, _b_orig, _b_bump, "Unexpected " #op " macro side-effect!\n"); \
} while (0)
-#define DEFINE_TEST_FUNC(t, fmt) \
-static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p) \
+#define DEFINE_TEST_FUNC_TYPED(n, t, fmt) \
+static void do_test_ ## n(struct kunit *test, const struct test_ ## n *p) \
{ \
check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \
check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \
@@ -245,15 +254,18 @@ static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p) \
check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \
} \
\
-static void t ## _overflow_test(struct kunit *test) { \
+static void n ## _overflow_test(struct kunit *test) { \
unsigned i; \
\
- for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \
- do_test_ ## t(test, &t ## _tests[i]); \
+ for (i = 0; i < ARRAY_SIZE(n ## _tests); ++i) \
+ do_test_ ## n(test, &n ## _tests[i]); \
kunit_info(test, "%zu %s arithmetic tests finished\n", \
- ARRAY_SIZE(t ## _tests), #t); \
+ ARRAY_SIZE(n ## _tests), #n); \
}
+#define DEFINE_TEST_FUNC(t, fmt) \
+ DEFINE_TEST_FUNC_TYPED(t ## _ ## t ## __ ## t, t, fmt)
+
DEFINE_TEST_FUNC(u8, "%d");
DEFINE_TEST_FUNC(s8, "%d");
DEFINE_TEST_FUNC(u16, "%d");
@@ -265,9 +277,32 @@ DEFINE_TEST_FUNC(u64, "%llu");
DEFINE_TEST_FUNC(s64, "%lld");
#endif
-static void overflow_shift_test(struct kunit *test)
-{
- int count = 0;
+DEFINE_TEST_ARRAY_TYPED(u32, u32, u8) = {
+ {0, 0, 0, 0, 0, false, false, false},
+ {U8_MAX, 2, 1, U8_MAX - 2, U8_MAX - 1, true, false, true},
+ {U8_MAX + 1, 0, 0, 0, 0, true, true, false},
+};
+DEFINE_TEST_FUNC_TYPED(u32_u32__u8, u8, "%d");
+
+DEFINE_TEST_ARRAY_TYPED(u32, u32, int) = {
+ {0, 0, 0, 0, 0, false, false, false},
+ {U32_MAX, 0, -1, -1, 0, true, true, false},
+};
+DEFINE_TEST_FUNC_TYPED(u32_u32__int, int, "%d");
+
+DEFINE_TEST_ARRAY_TYPED(u8, u8, int) = {
+ {0, 0, 0, 0, 0, false, false, false},
+ {U8_MAX, U8_MAX, 2 * U8_MAX, 0, U8_MAX * U8_MAX, false, false, false},
+ {1, 2, 3, -1, 2, false, false, false},
+};
+DEFINE_TEST_FUNC_TYPED(u8_u8__int, int, "%d");
+
+DEFINE_TEST_ARRAY_TYPED(int, int, u8) = {
+ {0, 0, 0, 0, 0, false, false, false},
+ {1, 2, 3, U8_MAX, 2, false, true, false},
+ {-1, 0, U8_MAX, U8_MAX, 0, true, true, false},
+};
+DEFINE_TEST_FUNC_TYPED(int_int__u8, u8, "%d");
/* Args are: value, shift, type, expected result, overflow expected */
#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \
@@ -292,6 +327,10 @@ static void overflow_shift_test(struct kunit *test)
count++; \
} while (0)
+static void shift_sane_test(struct kunit *test)
+{
+ int count = 0;
+
/* Sane shifts. */
TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
@@ -334,6 +373,13 @@ static void overflow_shift_test(struct kunit *test)
TEST_ONE_SHIFT(0, 30, s32, 0, false);
TEST_ONE_SHIFT(0, 62, s64, 0, false);
+ kunit_info(test, "%d sane shift tests finished\n", count);
+}
+
+static void shift_overflow_test(struct kunit *test)
+{
+ int count = 0;
+
/* Overflow: shifted the bit off the end. */
TEST_ONE_SHIFT(1, 8, u8, 0, true);
TEST_ONE_SHIFT(1, 16, u16, 0, true);
@@ -381,6 +427,13 @@ static void overflow_shift_test(struct kunit *test)
/* 0100000100001000001000000010000001000010000001000100010001001011 */
TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
+ kunit_info(test, "%d overflow shift tests finished\n", count);
+}
+
+static void shift_truncate_test(struct kunit *test)
+{
+ int count = 0;
+
/* Overflow: values larger than destination type. */
TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
@@ -392,6 +445,33 @@ static void overflow_shift_test(struct kunit *test)
TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
+ /* Overflow: shifted at or beyond entire type's bit width. */
+ TEST_ONE_SHIFT(0, 8, u8, 0, true);
+ TEST_ONE_SHIFT(0, 9, u8, 0, true);
+ TEST_ONE_SHIFT(0, 8, s8, 0, true);
+ TEST_ONE_SHIFT(0, 9, s8, 0, true);
+ TEST_ONE_SHIFT(0, 16, u16, 0, true);
+ TEST_ONE_SHIFT(0, 17, u16, 0, true);
+ TEST_ONE_SHIFT(0, 16, s16, 0, true);
+ TEST_ONE_SHIFT(0, 17, s16, 0, true);
+ TEST_ONE_SHIFT(0, 32, u32, 0, true);
+ TEST_ONE_SHIFT(0, 33, u32, 0, true);
+ TEST_ONE_SHIFT(0, 32, int, 0, true);
+ TEST_ONE_SHIFT(0, 33, int, 0, true);
+ TEST_ONE_SHIFT(0, 32, s32, 0, true);
+ TEST_ONE_SHIFT(0, 33, s32, 0, true);
+ TEST_ONE_SHIFT(0, 64, u64, 0, true);
+ TEST_ONE_SHIFT(0, 65, u64, 0, true);
+ TEST_ONE_SHIFT(0, 64, s64, 0, true);
+ TEST_ONE_SHIFT(0, 65, s64, 0, true);
+
+ kunit_info(test, "%d truncate shift tests finished\n", count);
+}
+
+static void shift_nonsense_test(struct kunit *test)
+{
+ int count = 0;
+
/* Nonsense: negative initial value. */
TEST_ONE_SHIFT(-1, 0, s8, 0, true);
TEST_ONE_SHIFT(-1, 0, u8, 0, true);
@@ -416,26 +496,6 @@ static void overflow_shift_test(struct kunit *test)
TEST_ONE_SHIFT(0, -30, s64, 0, true);
TEST_ONE_SHIFT(0, -30, u64, 0, true);
- /* Overflow: shifted at or beyond entire type's bit width. */
- TEST_ONE_SHIFT(0, 8, u8, 0, true);
- TEST_ONE_SHIFT(0, 9, u8, 0, true);
- TEST_ONE_SHIFT(0, 8, s8, 0, true);
- TEST_ONE_SHIFT(0, 9, s8, 0, true);
- TEST_ONE_SHIFT(0, 16, u16, 0, true);
- TEST_ONE_SHIFT(0, 17, u16, 0, true);
- TEST_ONE_SHIFT(0, 16, s16, 0, true);
- TEST_ONE_SHIFT(0, 17, s16, 0, true);
- TEST_ONE_SHIFT(0, 32, u32, 0, true);
- TEST_ONE_SHIFT(0, 33, u32, 0, true);
- TEST_ONE_SHIFT(0, 32, int, 0, true);
- TEST_ONE_SHIFT(0, 33, int, 0, true);
- TEST_ONE_SHIFT(0, 32, s32, 0, true);
- TEST_ONE_SHIFT(0, 33, s32, 0, true);
- TEST_ONE_SHIFT(0, 64, u64, 0, true);
- TEST_ONE_SHIFT(0, 65, u64, 0, true);
- TEST_ONE_SHIFT(0, 64, s64, 0, true);
- TEST_ONE_SHIFT(0, 65, s64, 0, true);
-
/*
* Corner case: for unsigned types, we fail when we've shifted
* through the entire width of bits. For signed types, we might
@@ -451,9 +511,9 @@ static void overflow_shift_test(struct kunit *test)
TEST_ONE_SHIFT(0, 31, s32, 0, false);
TEST_ONE_SHIFT(0, 63, s64, 0, false);
- kunit_info(test, "%d shift tests finished\n", count);
-#undef TEST_ONE_SHIFT
+ kunit_info(test, "%d nonsense shift tests finished\n", count);
}
+#undef TEST_ONE_SHIFT
/*
* Deal with the various forms of allocator arguments. See comments above
@@ -649,18 +709,25 @@ static void overflow_size_helpers_test(struct kunit *test)
}
static struct kunit_case overflow_test_cases[] = {
- KUNIT_CASE(u8_overflow_test),
- KUNIT_CASE(s8_overflow_test),
- KUNIT_CASE(u16_overflow_test),
- KUNIT_CASE(s16_overflow_test),
- KUNIT_CASE(u32_overflow_test),
- KUNIT_CASE(s32_overflow_test),
+ KUNIT_CASE(u8_u8__u8_overflow_test),
+ KUNIT_CASE(s8_s8__s8_overflow_test),
+ KUNIT_CASE(u16_u16__u16_overflow_test),
+ KUNIT_CASE(s16_s16__s16_overflow_test),
+ KUNIT_CASE(u32_u32__u32_overflow_test),
+ KUNIT_CASE(s32_s32__s32_overflow_test),
/* Clang 13 and earlier generate unwanted libcalls on 32-bit. */
#if BITS_PER_LONG == 64
- KUNIT_CASE(u64_overflow_test),
- KUNIT_CASE(s64_overflow_test),
+ KUNIT_CASE(u64_u64__u64_overflow_test),
+ KUNIT_CASE(s64_s64__s64_overflow_test),
#endif
- KUNIT_CASE(overflow_shift_test),
+ KUNIT_CASE(u32_u32__u8_overflow_test),
+ KUNIT_CASE(u32_u32__int_overflow_test),
+ KUNIT_CASE(u8_u8__int_overflow_test),
+ KUNIT_CASE(int_int__u8_overflow_test),
+ KUNIT_CASE(shift_sane_test),
+ KUNIT_CASE(shift_overflow_test),
+ KUNIT_CASE(shift_truncate_test),
+ KUNIT_CASE(shift_nonsense_test),
KUNIT_CASE(overflow_allocation_test),
KUNIT_CASE(overflow_size_helpers_test),
{}
diff --git a/lib/ratelimit.c b/lib/ratelimit.c
index e01a93f46f83..ce945c17980b 100644
--- a/lib/ratelimit.c
+++ b/lib/ratelimit.c
@@ -26,10 +26,16 @@
*/
int ___ratelimit(struct ratelimit_state *rs, const char *func)
{
+ /* Paired with WRITE_ONCE() in .proc_handler().
+ * Changing two values seperately could be inconsistent
+ * and some message could be lost. (See: net_ratelimit_state).
+ */
+ int interval = READ_ONCE(rs->interval);
+ int burst = READ_ONCE(rs->burst);
unsigned long flags;
int ret;
- if (!rs->interval)
+ if (!interval)
return 1;
/*
@@ -44,7 +50,7 @@ int ___ratelimit(struct ratelimit_state *rs, const char *func)
if (!rs->begin)
rs->begin = jiffies;
- if (time_is_before_jiffies(rs->begin + rs->interval)) {
+ if (time_is_before_jiffies(rs->begin + interval)) {
if (rs->missed) {
if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE)) {
printk_deferred(KERN_WARNING
@@ -56,7 +62,7 @@ int ___ratelimit(struct ratelimit_state *rs, const char *func)
rs->begin = jiffies;
rs->printed = 0;
}
- if (rs->burst && rs->burst > rs->printed) {
+ if (burst && burst > rs->printed) {
rs->printed++;
ret = 1;
} else {
diff --git a/lib/stackinit_kunit.c b/lib/stackinit_kunit.c
index 35c69aa425b2..4591d6cf5e01 100644
--- a/lib/stackinit_kunit.c
+++ b/lib/stackinit_kunit.c
@@ -3,7 +3,7 @@
* Test cases for compiler-based stack variable zeroing via
* -ftrivial-auto-var-init={zero,pattern} or CONFIG_GCC_PLUGIN_STRUCTLEAK*.
* For example, see:
- * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests
+ * "Running tests with kunit_tool" at Documentation/dev-tools/kunit/start.rst
* ./tools/testing/kunit/kunit.py run stackinit [--raw_output] \
* --make_option LLVM=1 \
* --kconfig_add CONFIG_INIT_STACK_ALL_ZERO=y
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 5ed3beb066e6..230020a2e076 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -131,6 +131,50 @@ void string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
}
EXPORT_SYMBOL(string_get_size);
+/**
+ * parse_int_array_user - Split string into a sequence of integers
+ * @from: The user space buffer to read from
+ * @count: The maximum number of bytes to read
+ * @array: Returned pointer to sequence of integers
+ *
+ * On success @array is allocated and initialized with a sequence of
+ * integers extracted from the @from plus an additional element that
+ * begins the sequence and specifies the integers count.
+ *
+ * Caller takes responsibility for freeing @array when it is no longer
+ * needed.
+ */
+int parse_int_array_user(const char __user *from, size_t count, int **array)
+{
+ int *ints, nints;
+ char *buf;
+ int ret = 0;
+
+ buf = memdup_user_nul(from, count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ get_options(buf, 0, &nints);
+ if (!nints) {
+ ret = -ENOENT;
+ goto free_buf;
+ }
+
+ ints = kcalloc(nints + 1, sizeof(*ints), GFP_KERNEL);
+ if (!ints) {
+ ret = -ENOMEM;
+ goto free_buf;
+ }
+
+ get_options(buf, nints + 1, ints);
+ *array = ints;
+
+free_buf:
+ kfree(buf);
+ return ret;
+}
+EXPORT_SYMBOL(parse_int_array_user);
+
static bool unescape_space(char **src, char **dst)
{
char *p = *dst, *q = *src;
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 3c1853a9d1c0..c414a8d9f1ea 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -2246,6 +2246,9 @@ int __init no_hash_pointers_enable(char *str)
}
early_param("no_hash_pointers", no_hash_pointers_enable);
+/* Used for Rust formatting ('%pA'). */
+char *rust_fmt_argument(char *buf, char *end, void *ptr);
+
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of alphanumeric characters that are extended format
@@ -2372,6 +2375,10 @@ early_param("no_hash_pointers", no_hash_pointers_enable);
*
* Note: The default behaviour (unadorned %p) is to hash the address,
* rendering it useful as a unique identifier.
+ *
+ * There is also a '%pA' format specifier, but it is only intended to be used
+ * from Rust code to format core::fmt::Arguments. Do *not* use it from C.
+ * See rust/kernel/print.rs for details.
*/
static noinline_for_stack
char *pointer(const char *fmt, char *buf, char *end, void *ptr,
@@ -2444,6 +2451,12 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return device_node_string(buf, end, ptr, spec, fmt + 1);
case 'f':
return fwnode_string(buf, end, ptr, spec, fmt + 1);
+ case 'A':
+ if (!IS_ENABLED(CONFIG_RUST)) {
+ WARN_ONCE(1, "Please remove %%pA from non-Rust code\n");
+ return error_string(buf, end, "(%pA?)", spec);
+ }
+ return rust_fmt_argument(buf, end, ptr);
case 'x':
return pointer_string(buf, end, ptr, spec);
case 'e':
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-03 06:22:32 +0000