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cptbox: compare projected with real instead of normalized #1002

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cptbox: compare projected with real instead of normalized #1002

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4 changes: 2 additions & 2 deletions dmoj/cptbox/isolate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -354,7 +354,7 @@ def _access_check(self, debugger: Debugger, file: str, fs_jail: FilesystemPolicy
real = os.path.realpath(file)

try:
same = normalized == real or os.path.samefile(projected, real)
same = projected == real or os.path.samefile(projected, real)
except OSError:
raise DeniedSyscall(ACCESS_ENOENT, f'Cannot stat, file: {file}, projected: {projected}, real: {real}')

Expand All @@ -366,7 +366,7 @@ def _access_check(self, debugger: Debugger, file: str, fs_jail: FilesystemPolicy
if not fs_jail.check(normalized):
raise DeniedSyscall(ACCESS_EACCES, f'Denying {file}, normalized to {normalized}')

if normalized != real:
if projected != real:
proc_dir = f'/proc/{debugger.tid}'
if real.startswith(proc_dir):
real = os.path.join('/proc/self', os.path.relpath(real, proc_dir))
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