[llvm-bugs] [Bug 43114] New: Clan7.0.1 does not apply -D_FORTIFY_SOURCE=2

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43114

            Bug ID: 43114
           Summary: Clan7.0.1 does not apply -D_FORTIFY_SOURCE=2
           Product: clang
           Version: 7.0
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Vikas.Pandey2 at harman.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

echo $CC
aarch64-poky-linux-musl-clang -mlittle-endian
--sysroot=/data/home/user-name/work/toolchain/install_clang/sysroots/aarch64-poky-linux-musl


main.c file content:
---------------------
#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[]) {
    char buffer[8];
    strcpy(buffer, argv[0]);
    puts(buffer);
    return 0;
}


$CC -O2 -D_FORTIFY_SOURCE=2  main.c -o main.o
./checksec.sh -f main.o
RELRO              STACK CANARY      NX                         PIE            
RPATH             RUNPATH      FORTIFY     Fortified     Fortifiable     FILE
Partial RELRO   Canary found      NX enabled    PIE enabled     No RPATH   No
RUNPATH   Yes              0                    2                 main.o

root at b1:~/usb_drive# ./main.o
./main.o
Segmentation fault


Expected : ---
./main.o
*** buffer overflow detected ***: ./main.o terminated
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7320f)[0x7f630b4a120f]
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x37)[0x7f630b5244e7]
/lib/x86_64-linux-gnu/libc.so.6(+0xf4700)[0x7f630b522700]
./fortify_example[0x4005ba]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7f630b44fb45]
./fortify_example[0x4004c9]
======= Memory map: ========
00400000-00401000 r-xp 00000000 fb:01 391109                            
/tmp/main.o
[... blah blah blah ...]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                 
[vsyscall]

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