The culprit supposedly found. fortify-headers makes memcpy() assert that source and destination shouldn't overlap, and when they do it calls __builtin_trap(): http://git.2f30.org/fortify-headers/file/include/string.h.html#l46 PerlIO::eol in its turn uses memcpy() to remove symbols from a string (source and destination overlaps). The questions that are left are: 1) Is fortify-headers too strict, or PerlIO::eol should be fixed? 2) What -O0 has to do with this? Regards, Yuri On Fri, Apr 21, 2023 at 9:02 AM Yuri Kanivetsky <yuri.kanivetsky@xxxxxxxxx> wrote: > > Hi, > > $ cat a.sh > apk add perl-dev perl-utils perl-libwww perl-lwp-protocol-https build-base gdb > cpan -g PerlIO::eol || true > tar xf Perl* > cd Perl* > sed -Ei '/\bWriteMakefile\b/i\\n$WriteMakefileArgs{OPTIMIZE} = "-g3 > -gdwarf-4 -O";' Makefile.PL > # sed -Ei '/\bWriteMakefile\b/i\\n$WriteMakefileArgs{OPTIMIZE} = > "-O0";' Makefile.PL > perl Makefile.PL > make install > cd /app > gdb -ex 'break PerlIOEOL_fill' -ex r --args perl a.pl > > $ cat a.pl > use strict; > use warnings; > open my $fh, '<:raw:eol(LF)', 'a.txt'; > my $l = <$fh>; > print $l, "\n"; > > $ echo -e 'line 1\nline 2\r\nline 3' > a.txt > > $ docker run --rm -itv $PWD:/app alpine:3.17 sh -eux app/a.sh > ... > Breakpoint 1, PerlIOEOL_fill (my_perl=0x7f977d80e020, > f=0x7f977d7ea180) at eol.xs:117 > 117 { > (gdb) c > Continuing. > > Program received signal SIGILL, Illegal instruction. > PerlIOEOL_fill (my_perl=<optimized out>, f=<optimized out>) at eol.xs:132 > 132 Copy(start, ptr, i - start, STDCHAR); > (gdb) backtrace > #0 PerlIOEOL_fill (my_perl=<optimized out>, f=<optimized out>) at eol.xs:132 > #1 0x00007f977d970a74 in Perl_PerlIO_fill () from > /usr/lib/perl5/core_perl/CORE/libperl.so > #2 0x00007f977d973353 in PerlIOBase_read () from > /usr/lib/perl5/core_perl/CORE/libperl.so > #3 0x00007f977d9733e9 in PerlIO_getc () from > /usr/lib/perl5/core_perl/CORE/libperl.so > #4 0x00007f977d91a5df in Perl_sv_gets () from > /usr/lib/perl5/core_perl/CORE/libperl.so > #5 0x00007f977d9037de in Perl_do_readline () from > /usr/lib/perl5/core_perl/CORE/libperl.so > #6 0x00007f977d8fe780 in Perl_runops_standard () from > /usr/lib/perl5/core_perl/CORE/libperl.so > #7 0x00007f977d8841ba in perl_run () from > /usr/lib/perl5/core_perl/CORE/libperl.so > #8 0x000055ca41b3b1db in main () > > But with -O0 it supposedly works. What's going on here? How do I debug it? > > Regards, > Yuri
