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UBSAN uses compile-time instrumentation 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. So the most of the work is done by compiler. This patch just implements ubsan handlers printing errors. GCC has this capability since 4.9.x [1] (see -fsanitize=undefined option and its suboptions). However GCC 5.x has more checkers implemented [2]. Article [3] has a bit more details about UBSAN in the GCC. [1] - https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/Debugging-Options.html [2] - https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html [3] - http://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/ Issues which UBSAN has found thus far are: Found bugs: * out-of-bounds access - |
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tools | ||
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a20.c | ||
apm.c | ||
bioscall.S | ||
bitops.h | ||
boot.h | ||
cmdline.c | ||
code16gcc.h | ||
copy.S | ||
cpu.c | ||
cpucheck.c | ||
cpuflags.c | ||
cpuflags.h | ||
ctype.h | ||
early_serial_console.c | ||
edd.c | ||
header.S | ||
install.sh | ||
main.c | ||
Makefile | ||
memory.c | ||
mkcpustr.c | ||
mtools.conf.in | ||
pm.c | ||
pmjump.S | ||
printf.c | ||
regs.c | ||
setup.ld | ||
string.c | ||
string.h | ||
tty.c | ||
version.c | ||
vesa.h | ||
video-bios.c | ||
video-mode.c | ||
video-vesa.c | ||
video-vga.c | ||
video.c | ||
video.h |