Hi This is yet another sanitizer for linux kernel. UBSan uses copile-time instumentation to catch undefined behavior (UB). Compiler inserts code that perform certain kinds of checks before operations that could cause UB. If check fails (i.e. UB detected) __ubsan_handle_* function called. to print error message. Patch is also available via git: git://github.com/aryabinin/linux --branch ubsan/v1 GCC supports this since 4.9, however upcoming GCC 5.0 has more checkers implemented. Different kinds of checkers could be enabled via boot parameter: ubsan_handle=OEAINVBSLF. If ubsan_handle not present in cmdline default options are used: ELNVBSLF O - different kinds of overflows E - negation overflow, division overflow, division by zero. A - misaligned memory access. I - load from/store to an object with insufficient space. N - null argument declared with nonnull attribute, returned null from function which never returns null, null ptr dereference. V - variable size array with non-positive length B - out-of-bounds memory accesses. S - shifting out-of-bounds. L - load of invalid value (value out of range for the enum type, loading other then 0/1 to bool type) F - call to function through pointer with incorrect function type (AFAIK this is not implemented in gcc yet, probably works with clang, though I didn't check it). Andrey Ryabinin (1): UBSan: run-time undefined behavior sanity checker Makefile | 12 +- arch/x86/Kconfig | 1 + arch/x86/boot/Makefile | 1 + arch/x86/boot/compressed/Makefile | 1 + arch/x86/realmode/rm/Makefile | 1 + arch/x86/vdso/Makefile | 2 + drivers/firmware/efi/libstub/Makefile | 1 + include/linux/sched.h | 4 + kernel/printk/Makefile | 1 + lib/Kconfig.debug | 23 ++ lib/Makefile | 3 + lib/ubsan.c | 559 ++++++++++++++++++++++++++++++++++ lib/ubsan.h | 84 +++++ scripts/Makefile.lib | 6 + 14 files changed, 698 insertions(+), 1 deletion(-) create mode 100644 lib/ubsan.c create mode 100644 lib/ubsan.h -- 2.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
