Hi. 2018-05-31 13:18 GMT+09:00 Nathan Chancellor <natechancellor@xxxxxxxxx>: > Hi everyone, > > My apologies if this has already been reported in some capacity, I > searched the mailing list and patchwork but I didn't see anything. I think you are the first reporter. > With GCC 8.1.0, I am starting to see the following warnings from > Kconfig: > > CC scripts/kconfig/zconf.tab.c > LEX scripts/kconfig/zconf.lex.c > HOSTCC scripts/kconfig/zconf.tab.o > In file included from scripts/kconfig/zconf.tab.c:2496: > scripts/kconfig/confdata.c: In function ‘conf_write’: > scripts/kconfig/confdata.c:748:22: warning: ‘%s’ directive writing likely 7 or more bytes into a region of size between 1 and 4097 [-Wformat-overflow=] > sprintf(newname, "%s%s", dirname, basename); > ^~ > scripts/kconfig/confdata.c:748:19: note: assuming directive output of 7 bytes > sprintf(newname, "%s%s", dirname, basename); > ^~~~~~ > scripts/kconfig/confdata.c:748:2: note: ‘sprintf’ output 1 or more bytes (assuming 4104) into a destination of size 4097 > sprintf(newname, "%s%s", dirname, basename); > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > scripts/kconfig/confdata.c:751:23: warning: ‘.tmpconfig.’ directive writing 11 bytes into a region of size between 1 and 4097 [-Wformat-overflow=] > sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid()); > ^~~~~~~~~~~ > scripts/kconfig/confdata.c:751:3: note: ‘sprintf’ output between 13 and 4119 bytes into a destination of size 4097 > sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid()); > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > HOSTCC scripts/kconfig/conf.o > HOSTLD scripts/kconfig/conf > > I am not sure if this is a false positive or not, otherwise I would have > sent a patch. I tested on the latest linux-next with Masahiro's for-next > branch, currently at commit 57282f7da50c ("Merge branch 'kconfig' into > for-next"). I think these are legitimate warnings. A patch is welcome. -- Best Regards Masahiro Yamada -- 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