Implement ptrace access mode checking. - #13982
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Support the PTRACE_MODE_FSCREDS vs PTRACE_MODE_REALCREDS distinction from ptrace(2) "Ptrace access mode checking", progressing toward gvisor.dev/issue/260 (setfsuid/setfsgid). Introduce PtraceAccessMode and Task.CanTraceMode, and switch proc files to filesystem-credential checks: /proc/[pid]/mem uses PTRACE_MODE_ATTACH_FSCREDS; maps/smaps/environ/auxv and the exe/cwd/root/fd symlinks use PTRACE_MODE_READ_FSCREDS. Explicit ptrace-adjacent syscalls (ptrace, process_vm_readv/writev, pidfd_open, clone) keep PTRACE_MODE_*_REALCREDS as before. Assisted-by: opencode
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August 4, 2026 11:53
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Support the PTRACE_MODE_FSCREDS vs PTRACE_MODE_REALCREDS distinction from ptrace(2) "Ptrace access mode checking", progressing toward gvisor.dev/issue/260 (setfsuid/setfsgid).
Introduce PtraceAccessMode and Task.CanTraceMode, and switch proc files to filesystem-credential checks: /proc/[pid]/mem uses PTRACE_MODE_ATTACH_FSCREDS; maps/smaps/environ/auxv and the exe/cwd/root/fd symlinks use PTRACE_MODE_READ_FSCREDS. Explicit ptrace-adjacent syscalls (ptrace, process_vm_readv/writev, pidfd_open, clone) keep PTRACE_MODE_*_REALCREDS as before.
Assisted-by: opencode