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authorLinus Torvalds <torvalds@linux-foundation.org>2021-04-26 10:25:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-04-26 10:25:03 -0700
commit31a24ae89c92d5533c049046a76c6a2d649efb72 (patch)
tree59a0414ace944cd63a68eb15add10884e6cbaa99 /lib
parent6a713827cece73136bca63a93e7f9a35dd009d3e (diff)
parenta27a8816568964fcef62a3ae5f9d2228ec1ebc68 (diff)
downloadlinux-31a24ae89c92d5533c049046a76c6a2d649efb72.tar.gz
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Catalin Marinas: - MTE asynchronous support for KASan. Previously only synchronous (slower) mode was supported. Asynchronous is faster but does not allow precise identification of the illegal access. - Run kernel mode SIMD with softirqs disabled. This allows using NEON in softirq context for crypto performance improvements. The conditional yield support is modified to take softirqs into account and reduce the latency. - Preparatory patches for Apple M1: handle CPUs that only have the VHE mode available (host kernel running at EL2), add FIQ support. - arm64 perf updates: support for HiSilicon PA and SLLC PMU drivers, new functions for the HiSilicon HHA and L3C PMU, cleanups. - Re-introduce support for execute-only user permissions but only when the EPAN (Enhanced Privileged Access Never) architecture feature is available. - Disable fine-grained traps at boot and improve the documented boot requirements. - Support CONFIG_KASAN_VMALLOC on arm64 (only with KASAN_GENERIC). - Add hierarchical eXecute Never permissions for all page tables. - Add arm64 prctl(PR_PAC_{SET,GET}_ENABLED_KEYS) allowing user programs to control which PAC keys are enabled in a particular task. - arm64 kselftests for BTI and some improvements to the MTE tests. - Minor improvements to the compat vdso and sigpage. - Miscellaneous cleanups. * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (86 commits) arm64/sve: Add compile time checks for SVE hooks in generic functions arm64/kernel/probes: Use BUG_ON instead of if condition followed by BUG. arm64: pac: Optimize kernel entry/exit key installation code paths arm64: Introduce prctl(PR_PAC_{SET,GET}_ENABLED_KEYS) arm64: mte: make the per-task SCTLR_EL1 field usable elsewhere arm64/sve: Remove redundant system_supports_sve() tests arm64: fpsimd: run kernel mode NEON with softirqs disabled arm64: assembler: introduce wxN aliases for wN registers arm64: assembler: remove conditional NEON yield macros kasan, arm64: tests supports for HW_TAGS async mode arm64: mte: Report async tag faults before suspend arm64: mte: Enable async tag check fault arm64: mte: Conditionally compile mte_enable_kernel_*() arm64: mte: Enable TCO in functions that can read beyond buffer limits kasan: Add report for async mode arm64: mte: Drop arch_enable_tagging() kasan: Add KASAN mode kernel parameter arm64: mte: Add asynchronous mode support arm64: Get rid of CONFIG_ARM64_VHE arm64: Cope with CPUs stuck in VHE mode ...
Diffstat (limited to 'lib')
-rw-r--r--lib/test_kasan.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index e5647d147b35..785e724ce0d8 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -69,10 +69,10 @@ static void kasan_test_exit(struct kunit *test)
* resource named "kasan_data". Do not use this name for KUnit resources
* outside of KASAN tests.
*
- * For hardware tag-based KASAN, when a tag fault happens, tag checking is
- * normally auto-disabled. When this happens, this test handler reenables
- * tag checking. As tag checking can be only disabled or enabled per CPU, this
- * handler disables migration (preemption).
+ * For hardware tag-based KASAN in sync mode, when a tag fault happens, tag
+ * checking is auto-disabled. When this happens, this test handler reenables
+ * tag checking. As tag checking can be only disabled or enabled per CPU,
+ * this handler disables migration (preemption).
*
* Since the compiler doesn't see that the expression can change the fail_data
* fields, it can reorder or optimize away the accesses to those fields.
@@ -80,7 +80,8 @@ static void kasan_test_exit(struct kunit *test)
* expression to prevent that.
*/
#define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \
- if (IS_ENABLED(CONFIG_KASAN_HW_TAGS)) \
+ if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
+ !kasan_async_mode_enabled()) \
migrate_disable(); \
WRITE_ONCE(fail_data.report_expected, true); \
WRITE_ONCE(fail_data.report_found, false); \
@@ -92,12 +93,16 @@ static void kasan_test_exit(struct kunit *test)
barrier(); \
expression; \
barrier(); \
+ if (kasan_async_mode_enabled()) \
+ kasan_force_async_fault(); \
+ barrier(); \
KUNIT_EXPECT_EQ(test, \
READ_ONCE(fail_data.report_expected), \
READ_ONCE(fail_data.report_found)); \
- if (IS_ENABLED(CONFIG_KASAN_HW_TAGS)) { \
+ if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
+ !kasan_async_mode_enabled()) { \
if (READ_ONCE(fail_data.report_found)) \
- kasan_enable_tagging(); \
+ kasan_enable_tagging_sync(); \
migrate_enable(); \
} \
} while (0)