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fix(mctx): keep task args from running as shell code - #2296
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Task argument values were spliced into command strings unquoted. In a
single `exec` string a value with spaces shattered into several argv
entries and quotes broke the shlex split; in a `bash` script a value
could terminate the surrounding quoted region and run as shell code.
interpolate_task_strings now picks the value transform per action: exec
single strings get shell-quoted values (each %{name} is exactly one
argument after the split), bash scripts get values escaped for a
double-quoted context. echo, list-form exec, and cmd actions pass values
to their runner directly, without a shell, and stay verbatim.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com
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The title is concise, specific, uses the required Conventional Commit format, and accurately describes the shell-safety fix. |
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The description clearly explains the change and provides detailed verification results. It does not use the template's exact Testing and Checklist headings, but it covers the required testing and docu… |
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Docstring coverage is 96.15% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 4 files. (2 skipped: 2 unsupported.)
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The description clearly explains the change and provides detailed verification results. It does not use the template's exact Testing and Checklist headings, but it covers the required testing and documents the behavior change.
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A rabbit checks each argv bead,
Keeps hostile strings from taking lead.
Bash gets bindings, names made clear,
Arrays count and indexes appear.
The sandbox starts with env in tow.
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Inline comments:
Review comments at @crates/mctx/src/env.rs:
- Line 704: Update quote_for_shlex and its substitution flow to account for
placeholders already enclosed in quotes in the exec string, so added quoting
does not become literal argument text or alter argument boundaries;
alternatively, reject unsupported quote contexts before substitution. Add a
regression test for an already-quoted placeholder and preserve
one-value-per-placeholder behavior.
- Around line 676-677: Update the Bash handling in the TaskAction::Bash branch
so escape_for_dquote is applied only to placeholders inside double quotes, while
unquoted and single-quoted placeholders preserve their previous behavior. Limit
the safety documentation claim to double-quoted placeholders, and add tests that
define the intended behavior for unquoted and single-quoted values.
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crates/mctx/src/env.rsdocs/reference/tasks.md
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… env vars
Replace splice-time quoting with designs that never put a value where a
shell or the word splitter reads it as syntax.
A single exec string is split into argv words with every string value
standing in as an opaque token, then each value fills in its own word,
so the author's quoting around a reference no longer changes the value.
The task becomes a list-form exec and no shell runs it.
A bash script gets ${MIN_ARG_<NAME>} for each string reference, and the
value is bound in the invocation's environment (arrays as _<i> plus
_COUNT). The daemon and mip launch paths now pass Invocation::envs to the
sandbox command.
An enum value is validated against the author's permitted set, so it is
author text and a Nickel expression such as an if on it must see it.
Document that a string arg is an opaque placeholder inside %{...}, and
that numbers and booleans keep their values.
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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minimal, and validate.
Inline comments:
Review comments at @crates/mctx/src/env.rs:
- Around line 682-684: Update the `Shlex` parsing in the `exec` handling flow to
check `had_error` after collecting arguments and return an error for malformed
input. Also return an error when the collected argv is empty, so execution never
proceeds without a program.
- Around line 676-680: Separate the argument values passed through
`task_var_ctx` for `VarCtx::eval_string` from the shell-safe values produced by
`sentinel_arg`, so Nickel expressions see actual string and enum values while
opaque tokens remain for direct `exec` word and bash variable insertion. Keep
tokens intact through `shlex` splitting, and add coverage for conditionals, enum
comparisons, and string functions.
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crates/mctx/Cargo.tomlcrates/mctx/src/env.rscrates/mctx/src/lib.rscrates/minimald/src/exec.rscrates/mip/src/cmd_run.rsdocs/reference/tasks.md
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Task argument values were spliced into command strings unquoted, so in a single exec string
a value with spaces shattered into several argv entries, and in a bash script a value could
end the quoted region and run as shell code. A single exec string is now split into argv
words with each string value standing in as an opaque token, then each value fills its own
word, and no shell runs it. A bash script gets ${MIN_ARG_<NAME>} for each string reference,
with the value bound in the invocation's environment. The daemon and mip launch paths pass
Invocation::envs to the sandbox command. An enum value keeps its real value, since it is
validated against the author's permitted set.
Backport of #2296. Adapted to the line: sandbox:: reads sandbox2:: in mctx.
(cherry picked from commit cfcff04)
Task argument values were spliced into command strings unquoted, so in a single exec string
a value with spaces shattered into several argv entries, and in a bash script a value could
end the quoted region and run as shell code. A single exec string is now split into argv
words with each string value standing in as an opaque token, then each value fills its own
word, and no shell runs it. A bash script gets ${MIN_ARG_<NAME>} for each string reference,
with the value bound in the invocation's environment. The daemon and mip launch paths pass
Invocation::envs to the sandbox command. An enum value keeps its real value, since it is
validated against the author's permitted set.
Backport of #2296. Adapted to the line: sandbox:: reads sandbox2:: in mctx.
(cherry picked from commit cfcff04)
Routing-Key: inbox-route/I_kwDOSUhdos8AAAABX3vOwQ
Task argument values were spliced into command strings unquoted: in a
single
execstring a value with spaces shattered into several argventries and quotes broke the shlex split; in a
bashscript a valuecould terminate the quoted region and run as shell code. The argument
supplier (CI, an agent running
min task run -- args) is a separatetrust boundary from the
minimal.tomlauthor, so values are data.every string value standing in as an opaque token (private-use
sentinels), then each value fills in its own word. The task becomes a
list-form exec; no shell runs it. A value lands in exactly one argv
entry whatever it holds and however the author quoted the reference.
Splitting after Nickel evaluation (rather than splitting the raw
template) keeps references like
%{std.string.join " " files}working.${MIN_ARG_<NAME>}and the value is bound in the invocation'senvironment (
Invocation::envs); arrays bindMIN_ARG_<NAME>_<i>plusMIN_ARG_<NAME>_COUNT. Colliding names (a-bvsa_b) are refused.The daemon (
minimaldexec) andmip runlaunch paths now passInvocation::envsthrough viaEnv::invocation_command;Sandbox::runalready did.docs/reference/tasks.mdstates the per-action guarantee, the variablescheme, and the unquoted / single-quoted behaviour in bash.
Verification
just clippy,just fmt-check(Linux guest) — cleancargo nextest run -p mctx -p mfile -p mip -p op(Linux guest) — 172 passedcargo nextest run -p minimald task(Linux guest) — 21 passedcrates/mctx/src/env.rsrun hostile values (spaces,x; rm -rf ./victim,$(touch pwned), backticks, embedded'and",empty) through: exec bare / single- / double-quoted / joined to a flag
(asserting argv), exec arrays, bash unquoted / single- / double-quoted
(actually running
bash -cwith the bound env in a temp dir andasserting output plus no side effect), bash arrays, name collisions,
and echo.
just lint-prose docs/reference/tasks.md— no alerts in the edited sectionSummary by CodeRabbit
Bug Fixes
execcommands now keep each substituted argument within its intended word, even when values contain spaces or shell-special characters.bashcommands now receive string and array arguments through environment variables, with shell quoting determining how values are interpreted. Conflicting argument names are reported as errors.Documentation