Messages in this thread | | | From | Richard Weinberger <> | Date | Thu, 14 Feb 2019 00:36:29 +0100 | Subject | Re: Userspace regression in LTS and stable kernels |
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[CC'in relevant folks]
On Thu, Feb 14, 2019 at 12:19 AM Samuel Dionne-Riel <samuel@dionne-riel.com> wrote: > > Hi, > > I am posting as a representative of the NixOS Linux distribution, > about a userspace regression on 5.0-rc* which recently was backported > to the 4.14.99, 4.19.21 and 4.20.8 current LTS and stable versions. > The issue has been reported to the bug tracker, bug 202497, but seems > to have gone unnoticed by the maintainers. > > The issue seems to break userspace for long-standing patterns in the > NixOS distribution, with regards to use of the shebangs. > > Here is an example shebang causing an issue: > > #! /nix/store/mbwav8kz8b3y471wjsybgzw84mrh4js9-perl-5.28.1/bin/perl > -I/nix/store/x6yyav38jgr924nkna62q3pkp0dgmzlx-perl5.28.1-File-Slurp-9999.25/lib/perl5/site_perl > -I/nix/store/ha8v67sl8dac92r9z07vzr4gv1y9nwqz-perl5.28.1-Net-DBus-1.1.0/lib/perl5/site_perl > -I/nix/store/dcrkvnjmwh69ljsvpbdjjdnqgwx90a9d-perl5.28.1-XML-Parser-2.44/lib/perl5/site_perl > -I/nix/store/rmji88k2zz7h4zg97385bygcydrf2q8h-perl5.28.1-XML-Twig-3.52/lib/perl5/site_perl
This this ever work correctly? It is longer than BINPRM_BUF_SIZE.
> (The shebang was artificially wrapped spaces replaced by newlines) > > Another contributor tracked the regression it to commit > 8099b047ecc431518b9bb6bdbba3549bbecdc343 in the 5.0-rc* tree. > > I bring no particular fix to the issue, but I believe it should at > least be fast-tracked to a revert for the stable and LTS branches, and > since 5.0 might drop soon, a solution worked on, or possibly a revert > until one is figured out.
Your shebang line exceeds BINPRM_BUF_SIZE. Before the said commit the kernel silently truncated the shebang line (and corrupted it), now it tells the user that the line is too long.
Thanks, //richard
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