Package: fish Version: 3.0.2-2 Severity: normal Tags: upstream Dear Maintainer,
I was running a program under GDB, and I needed to have it read from a file which it is not permitted to read. So I typed (gdb) run < /dev/mem GDB ran fish (since that is my $SHELL) to execute my program. But fish was terminated by SIGABRT with the following stacktrace: An error occurred while redirecting file '/dev/mem' open: Permission denied <E> fish: src/exec.cpp:1032: failed assertion: this should be unreachable <E> fish: Backtrace: <E> fish: 0 /usr/bin/fish(+0xb16e7) [0x5555556056e7] <E> fish: 1 parse_execution_context_t::run_1_job(tnode_t<grammar::job>, block_t const*) + 2101 <E> fish: 2 parse_execution_context_t::run_job_conjunction(tnode_t<grammar::job_conjunction>, block_t const*) + 196 <E> fish: 3 parse_execution_result_t parse_execution_context_t::run_job_list<grammar::job_list>(tnode_t<grammar::job_list>, block_t const*) + 281 <E> fish: 4 parse_execution_context_t::eval_node(tnode_t<grammar::job_list>, block_t const*, io_chain_t const&) + 1380 <E> fish: 5 int parser_t::eval_node<grammar::job_list>(std::shared_ptr<parsed_source_t const>, tnode_t<grammar::job_list>, io_chain_t const&, block_type_t, std::shared_ptr<job_t>) + 777 <E> fish: 6 parser_t::eval(std::shared_ptr<parsed_source_t const>, io_chain_t const&, block_type_t) + 176 <E> fish: 7 parser_t::eval(std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, io_chain_t const&, block_type_t) + 225 <E> fish: 8 run_command_list(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*, io_chain_t const&) + 147 <E> fish: 9 main + 2200 <E> fish: 10 __libc_start_main + 235 <E> fish: 11 _start + 42 The first two lines are expected, but it then aborts because it reached an "unreachable" state (how embarrassing!) At first I thought that the problem was being run by GDB, but it is actually `exec' that is the problem. For example: $ fish -c 'exec cat < /dev/mem' An error occurred while redirecting file '/dev/mem' open: Permission denied <E> fish: src/exec.cpp:1032: failed assertion: this should be unreachable <E> fish: Backtrace: [...] Note the `exec' and the `<'. Without the `<', `cat' tries to open /dev/mem, not `fish', so the bug does not appear. This is not only specific to /dev/mem or special files. It can be any unreadable file, for example /etc/shadow. It can even be a file that does not exist. (Just remember to look for a file that does not exist outside of your home directory, since you are sure to have created every possible filename in your home directory if you are anything like me (actually, I usually just shove it under ~/misc these days).) Each time, it aborts in src/exec.cpp:1032. Fish should of course exit with an error, but it should not reach an "unreachable" state. This also happens if you redirect *to* an unwritable file even if it is readable (such as /etc/passwd). Also note that without the `exec', the bug does not appear: $ fish -c 'cat < /dev/mem' An error occurred while redirecting file '/dev/mem' open: Permission denied This looks like an upstream bug (hence the "upstream" tag), but I'm not sure because I haven't tried it with upstream fish yet. I'll send another message with my findings if I do get around to trying it with upstream. Thanks, Asher -- A witty saying proves nothing, but saying something pointless gets people's attention. -- System Information: Debian Release: bullseye/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 5.2.0-3-amd64 (SMP w/2 CPU cores) Kernel taint flags: TAINT_FIRMWARE_WORKAROUND Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages fish depends on: ii bc 1.07.1-2+b2 ii dpkg 1.19.7 ii elinks [www-browser] 0.13~20190125-4 ii epiphany-browser [www-browser] 3.32.1.2-3 ii firefox-esr [www-browser] 60.8.0esr-1 ii fish-common 3.0.2-2 ii libc6 2.29-2 ii libgcc1 1:9.2.1-8 ii libncurses6 6.1+20190803-1 ii libpcre2-32-0 10.32-5+b1 ii libstdc++6 9.2.1-8 ii libtinfo6 6.1+20190803-1 ii links2 [www-browser] 2.20.2-1 ii lynx [www-browser] 2.9.0dev.4-1 ii man-db 2.8.7-3 ii netrik [www-browser] 1.16.1-2+b2 ii python3 3.7.5-1 ii w3m [www-browser] 0.5.3-37+b1 Versions of packages fish recommends: ii xsel 1.2.0+git9bfc13d.20180109-3 Versions of packages fish suggests: pn doc-base <none> -- no debconf information
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