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cptbox/isolate: print target of denied *kill and prlimit syscalls #1176

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Jun 2, 2024
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cptbox/isolate: print target of denied *kill and prlimit syscalls #1176

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12 changes: 7 additions & 5 deletions dmoj/cptbox/isolate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -390,13 +390,15 @@ def _access_check(self, debugger: Debugger, file: str, fs_jail: FilesystemPolicy

def handle_kill(self, debugger: Debugger) -> None:
# Allow tgkill to execute as long as the target thread group is the debugged process
# libstdc++ seems to use this to signal itself, see <https://github.com/DMOJ/judge/issues/183>
if debugger.uarg0 != debugger.pid:
raise DeniedSyscall(ACCESS_EPERM, 'Cannot kill other processes')
# libstdc++ seems to use this to signal itself, see <https://github.com/DMOJ/judge/issues/18A3>
target = debugger.uarg0
if target != debugger.pid:
raise DeniedSyscall(ACCESS_EPERM, f'Cannot kill other processes (target={target}, self={debugger.pid})')

def handle_prlimit(self, debugger: Debugger) -> None:
if debugger.uarg0 not in (0, debugger.pid):
raise DeniedSyscall(ACCESS_EPERM, 'Cannot prlimit other processes')
target = debugger.uarg0
if target not in (0, debugger.pid):
raise DeniedSyscall(ACCESS_EPERM, f'Cannot prlimit other processes (target={target}, self={debugger.pid})')

def handle_prctl(self, debugger: Debugger) -> None:
PR_GET_DUMPABLE = 3
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