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Robert Hensing d038a67bd3 Fix segfault or stack overflow caused by large derivation fields 
This removes a dynamic stack allocation, making the derivation
unparsing logic robust against overflows when large strings are
added to a derivation.
Overflow behavior depends on the platform and stack configuration.

For instance, x86_64-linux/glibc behaves as (somewhat) expected:

$ (ulimit -s 20000; nix-instantiate tests/lang/eval-okay-big-derivation-attr.nix)
error: stack overflow (possible infinite recursion)

$ (ulimit -s 40000; nix-instantiate tests/lang/eval-okay-big-derivation-attr.nix)
error: expression does not evaluate to a derivation (or a set or list of those)

However, on aarch64-darwin:

$ nix-instantiate big-attr.nix                                                                                                                                                                                                                                                       ~
zsh: segmentation fault  nix-instantiate big-attr.nix

This indicates a slight flaw in the single stack protection page
approach that is not encountered with normal stack frames.
2022-01-19 15:21:56 +01:00
.github add pull_request_template.md 2021-12-09 14:31:34 -05:00
config Run autoupdate 2021-06-01 11:42:38 +02:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
doc/manual release-notes: document commit-lockfile-summary option 2022-01-18 16:10:44 -07:00
m4 autoconf: Fix C++17 detection not working on Ubuntu 16.04. 2019-07-03 04:32:25 +02:00
maintainers Update release script 2021-11-02 11:53:25 +01:00
misc Merge pull request #5820 from ncfavier/completion-nospace 2021-12-22 17:55:05 +01:00
mk mk/libraries.mk: fix trace-ld and trace-ar expansions 2021-10-08 22:59:42 +01:00
nix-rust Apply OS checks to host platform, not build 2021-06-23 15:00:36 +00:00
perl Document libsodium, which is now mandatory, as a dependency 2021-11-27 23:11:11 +01:00
scripts Merge pull request #5521 from abathur/clearly_mark_validation_step 2021-12-08 20:04:03 +00:00
src Fix segfault or stack overflow caused by large derivation fields 2022-01-19 15:21:56 +01:00
tests Fix segfault or stack overflow caused by large derivation fields 2022-01-19 15:21:56 +01:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig Add .editorconfig 2017-06-05 22:57:28 +01:00
.gitignore Remove nix-reduce-build and nix-http-export 2021-11-18 21:17:57 +01:00
.version Bump version 2021-12-14 00:01:42 +01:00
boehmgc-coroutine-sp-fallback.diff Fix leaking pthread_attr_t 2021-11-03 22:54:16 +01:00
bootstrap.sh bootstrap: Simplify & make more robust. 2011-09-06 12:11:05 +00:00
configure.ac Merge pull request #5678 from t184256/document-libsodium 2021-11-29 11:11:10 +01:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix Simplify shell.nix and default.nix 2020-06-17 19:21:46 +02:00
docker.nix docker: var/tmp make add -p option to mkdir to also create parent dirs 2022-01-15 14:11:37 +01:00
flake.lock Revert "update flake.nix to 21.11" 2021-12-15 13:49:05 +01:00
flake.nix Remove the references to boost on darwin 2022-01-15 11:34:15 +01:00
local.mk Remove 'dist' target 2020-12-03 16:17:58 +01:00
Makefile Install nlohmann_json headers 2021-11-11 11:05:44 +01:00
Makefile.config.in Apply OS checks to host platform, not build 2021-06-23 15:00:36 +00:00
precompiled-headers.h Config: Use nlohmann/json 2020-08-20 11:02:16 +02:00
README.md throw freenode down the memory hole 2021-05-27 21:48:39 +02:00
shell.nix Add back flake-compat shell.nix 2020-07-17 14:58:59 +00:00

README.md

Nix

Open Collective supporters Test

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation

On Linux and macOS the easiest way to install Nix is to run the following shell command (as a user other than root):

$ curl -L https://nixos.org/nix/install | sh

Information on additional installation methods is available on the Nix download page.

Building And Developing

See our Hacking guide in our manual for instruction on how to build nix from source with nix-build or how to get a development environment.

Additional Resources

License

Nix is released under the LGPL v2.1.