kasan: Extend KASAN mode kernel parameter
Architectures supported by KASAN_HW_TAGS can provide an asymmetric mode of execution. On an MTE enabled arm64 hw for example this can be identified with the asymmetric tagging mode of execution. In particular, when such a mode is present, the CPU triggers a fault on a tag mismatch during a load operation and asynchronously updates a register when a tag mismatch is detected during a store operation. Extend the KASAN HW execution mode kernel command line parameter to support asymmetric mode. Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Link: https://lore.kernel.org/r/20211006154751.4463-6-vincenzo.frascino@arm.com Signed-off-by: Will Deacon <will@kernel.org>
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@ -194,14 +194,17 @@ additional boot parameters that allow disabling KASAN or controlling features:
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- ``kasan=off`` or ``=on`` controls whether KASAN is enabled (default: ``on``).
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- ``kasan.mode=sync`` or ``=async`` controls whether KASAN is configured in
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synchronous or asynchronous mode of execution (default: ``sync``).
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- ``kasan.mode=sync``, ``=async`` or ``=asymm`` controls whether KASAN
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is configured in synchronous, asynchronous or asymmetric mode of
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execution (default: ``sync``).
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Synchronous mode: a bad access is detected immediately when a tag
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check fault occurs.
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Asynchronous mode: a bad access detection is delayed. When a tag check
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fault occurs, the information is stored in hardware (in the TFSR_EL1
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register for arm64). The kernel periodically checks the hardware and
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only reports tag faults during these checks.
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Asymmetric mode: a bad access is detected synchronously on reads and
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asynchronously on writes.
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- ``kasan.stacktrace=off`` or ``=on`` disables or enables alloc and free stack
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traces collection (default: ``on``).
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@ -88,7 +88,7 @@ static void kasan_test_exit(struct kunit *test)
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*/
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#define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \
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if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
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!kasan_async_mode_enabled()) \
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kasan_sync_fault_possible()) \
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migrate_disable(); \
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KUNIT_EXPECT_FALSE(test, READ_ONCE(fail_data.report_found)); \
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barrier(); \
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@ -29,6 +29,7 @@ enum kasan_arg_mode {
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KASAN_ARG_MODE_DEFAULT,
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KASAN_ARG_MODE_SYNC,
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KASAN_ARG_MODE_ASYNC,
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KASAN_ARG_MODE_ASYMM,
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};
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enum kasan_arg_stacktrace {
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@ -45,9 +46,9 @@ static enum kasan_arg_stacktrace kasan_arg_stacktrace __ro_after_init;
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DEFINE_STATIC_KEY_FALSE(kasan_flag_enabled);
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EXPORT_SYMBOL(kasan_flag_enabled);
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/* Whether the asynchronous mode is enabled. */
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bool kasan_flag_async __ro_after_init;
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EXPORT_SYMBOL_GPL(kasan_flag_async);
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/* Whether the selected mode is synchronous/asynchronous/asymmetric.*/
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enum kasan_mode kasan_mode __ro_after_init;
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EXPORT_SYMBOL_GPL(kasan_mode);
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/* Whether to collect alloc/free stack traces. */
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DEFINE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
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@ -69,7 +70,7 @@ static int __init early_kasan_flag(char *arg)
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}
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early_param("kasan", early_kasan_flag);
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/* kasan.mode=sync/async */
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/* kasan.mode=sync/async/asymm */
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static int __init early_kasan_mode(char *arg)
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{
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if (!arg)
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@ -79,6 +80,8 @@ static int __init early_kasan_mode(char *arg)
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kasan_arg_mode = KASAN_ARG_MODE_SYNC;
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else if (!strcmp(arg, "async"))
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kasan_arg_mode = KASAN_ARG_MODE_ASYNC;
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else if (!strcmp(arg, "asymm"))
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kasan_arg_mode = KASAN_ARG_MODE_ASYMM;
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else
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return -EINVAL;
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@ -116,11 +119,13 @@ void kasan_init_hw_tags_cpu(void)
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return;
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/*
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* Enable async mode only when explicitly requested through
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* the command line.
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* Enable async or asymm modes only when explicitly requested
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* through the command line.
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*/
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if (kasan_arg_mode == KASAN_ARG_MODE_ASYNC)
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hw_enable_tagging_async();
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else if (kasan_arg_mode == KASAN_ARG_MODE_ASYMM)
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hw_enable_tagging_asymm();
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else
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hw_enable_tagging_sync();
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}
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@ -143,15 +148,19 @@ void __init kasan_init_hw_tags(void)
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case KASAN_ARG_MODE_DEFAULT:
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/*
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* Default to sync mode.
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* Do nothing, kasan_flag_async keeps its default value.
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*/
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break;
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fallthrough;
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case KASAN_ARG_MODE_SYNC:
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/* Do nothing, kasan_flag_async keeps its default value. */
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/* Sync mode enabled. */
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kasan_mode = KASAN_MODE_SYNC;
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break;
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case KASAN_ARG_MODE_ASYNC:
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/* Async mode enabled. */
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kasan_flag_async = true;
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kasan_mode = KASAN_MODE_ASYNC;
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break;
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case KASAN_ARG_MODE_ASYMM:
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/* Asymm mode enabled. */
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kasan_mode = KASAN_MODE_ASYMM;
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break;
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}
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@ -13,16 +13,28 @@
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#include "../slab.h"
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DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
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extern bool kasan_flag_async __ro_after_init;
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enum kasan_mode {
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KASAN_MODE_SYNC,
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KASAN_MODE_ASYNC,
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KASAN_MODE_ASYMM,
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};
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extern enum kasan_mode kasan_mode __ro_after_init;
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static inline bool kasan_stack_collection_enabled(void)
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{
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return static_branch_unlikely(&kasan_flag_stacktrace);
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}
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static inline bool kasan_async_mode_enabled(void)
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static inline bool kasan_async_fault_possible(void)
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{
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return kasan_flag_async;
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return kasan_mode == KASAN_MODE_ASYNC || kasan_mode == KASAN_MODE_ASYMM;
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}
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static inline bool kasan_sync_fault_possible(void)
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{
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return kasan_mode == KASAN_MODE_SYNC || kasan_mode == KASAN_MODE_ASYMM;
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}
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#else
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@ -31,11 +43,16 @@ static inline bool kasan_stack_collection_enabled(void)
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return true;
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}
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static inline bool kasan_async_mode_enabled(void)
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static inline bool kasan_async_fault_possible(void)
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{
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return false;
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}
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static inline bool kasan_sync_fault_possible(void)
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{
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return true;
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}
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#endif
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
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@ -287,6 +304,9 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
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#ifndef arch_enable_tagging_async
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#define arch_enable_tagging_async()
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#endif
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#ifndef arch_enable_tagging_asymm
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#define arch_enable_tagging_asymm()
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#endif
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#ifndef arch_force_async_tag_fault
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#define arch_force_async_tag_fault()
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#endif
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@ -302,6 +322,7 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
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#define hw_enable_tagging_sync() arch_enable_tagging_sync()
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#define hw_enable_tagging_async() arch_enable_tagging_async()
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#define hw_enable_tagging_asymm() arch_enable_tagging_asymm()
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#define hw_force_async_tag_fault() arch_force_async_tag_fault()
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#define hw_get_random_tag() arch_get_random_tag()
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#define hw_get_mem_tag(addr) arch_get_mem_tag(addr)
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@ -312,6 +333,7 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
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#define hw_enable_tagging_sync()
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#define hw_enable_tagging_async()
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#define hw_enable_tagging_asymm()
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#endif /* CONFIG_KASAN_HW_TAGS */
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@ -112,7 +112,7 @@ static void start_report(unsigned long *flags)
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static void end_report(unsigned long *flags, unsigned long addr)
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{
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if (!kasan_async_mode_enabled())
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if (!kasan_async_fault_possible())
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trace_error_report_end(ERROR_DETECTOR_KASAN, addr);
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pr_err("==================================================================\n");
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add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
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