system: activate-ptrace-attach: Handle kernels without YAMA support.
* gnu/build/activation.scm (activate-ptrace-attach): Check for the existence of /proc/sys/kernel/yama/ptrace_scope before trying to write to it.
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@ -369,9 +369,11 @@ found in Linux 3.4 onward that prevents users from attaching to their own
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processes--see Yama.txt in the Linux source tree for the rationale. This
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processes--see Yama.txt in the Linux source tree for the rationale. This
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sounds like an unacceptable restriction for little or no security
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sounds like an unacceptable restriction for little or no security
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improvement."
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improvement."
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(call-with-output-file "/proc/sys/kernel/yama/ptrace_scope"
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(let ((file "/proc/sys/kernel/yama/ptrace_scope"))
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(when (file-exists? file)
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(call-with-output-file file
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(lambda (port)
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(lambda (port)
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(display 0 port))))
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(display 0 port))))))
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(define %current-system
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(define %current-system
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