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Diffstat (limited to 'third_party/nix/doc/manual/release-notes/rl-1.11.10.xml')
| -rw-r--r-- | third_party/nix/doc/manual/release-notes/rl-1.11.10.xml | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/nix/doc/manual/release-notes/rl-1.11.10.xml b/third_party/nix/doc/manual/release-notes/rl-1.11.10.xml new file mode 100644 index 0000000000..415388b3e2 --- /dev/null +++ b/third_party/nix/doc/manual/release-notes/rl-1.11.10.xml @@ -0,0 +1,31 @@ +<section xmlns="http://docbook.org/ns/docbook" + xmlns:xlink="http://www.w3.org/1999/xlink" + xmlns:xi="http://www.w3.org/2001/XInclude" + version="5.0" + xml:id="ssec-relnotes-1.11.10"> + +<title>Release 1.11.10 (2017-06-12)</title> + +<para>This release fixes a security bug in Nix’s “build user” build +isolation mechanism. Previously, Nix builders had the ability to +create setuid binaries owned by a <literal>nixbld</literal> +user. Such a binary could then be used by an attacker to assume a +<literal>nixbld</literal> identity and interfere with subsequent +builds running under the same UID.</para> + +<para>To prevent this issue, Nix now disallows builders to create +setuid and setgid binaries. On Linux, this is done using a seccomp BPF +filter. Note that this imposes a small performance penalty (e.g. 1% +when building GNU Hello). Using seccomp, we now also prevent the +creation of extended attributes and POSIX ACLs since these cannot be +represented in the NAR format and (in the case of POSIX ACLs) allow +bypassing regular Nix store permissions. On macOS, the restriction is +implemented using the existing sandbox mechanism, which now uses a +minimal “allow all except the creation of setuid/setgid binaries” +profile when regular sandboxing is disabled. On other platforms, the +“build user” mechanism is now disabled.</para> + +<para>Thanks go to Linus Heckemann for discovering and reporting this +bug.</para> + +</section> |