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Sandbox: Mount a temporary directory on /dev/shm #1484

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Merged
prandla merged 1 commit into from
Aug 22, 2025
Merged

Sandbox: Mount a temporary directory on /dev/shm #1484

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10 changes: 8 additions & 2 deletions cms/grading/Sandbox.py
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Original file line number Diff line number Diff line change
Expand Up @@ -217,7 +217,7 @@ def __init__(
# TODO: move all other common properties here.
self.box_id: int = 0
self.fsize: int | None = None
self.dirs: list[tuple[str, str, str | None]] = []
self.dirs: list[tuple[str | None, str, str | None]] = []
self.preserve_env: bool = False
self.inherit_env: list[str] = []
self.set_env: dict[str, str] = {}
Expand Down Expand Up @@ -966,6 +966,10 @@ def __init__(self, file_cacher, name=None, temp_dir=None):
self.add_mapped_directory(
self._home, dest=self._home_dest, options="rw")

# Create temporary directory on /dev/shm to prevent communication
# between sandboxes.
self.dirs.append((None, "/dev/shm", "tmp"))

# Set common environment variables.
# Specifically needed by Python, that searches the home for
# packages.
Expand Down Expand Up @@ -1132,7 +1136,9 @@ def build_box_options(self) -> list[str]:
if self.chdir is not None:
res += ["--chdir=%s" % self.chdir]
for src, dest, options in self.dirs:
s = dest + "=" + src
s = dest
if src is not None:
s += "=" + src
if options is not None:
s += ":" + options
res += ["--dir=%s" % s]
Expand Down