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Input/output error on PTRACE_PEEKDATA on recent kernels #393

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remram44 opened this issue Aug 28, 2023 · 3 comments
Open

Input/output error on PTRACE_PEEKDATA on recent kernels #393

remram44 opened this issue Aug 28, 2023 · 3 comments
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A-question Attention: There is an open question for which more input is requested C-tracer (C) Component: The C part of the tracer codebase (_pytracer extension) T-bug Type: A fix for unwanted behavior, NOT a new feature or a simple enhancement

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@remram44
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In some situations, PTRACE_PEEKDATA returns Input/output error (errno=EIO).

This should be investigated and defended against.
@remram44 remram44 added T-bug Type: A fix for unwanted behavior, NOT a new feature or a simple enhancement A-question Attention: There is an open question for which more input is requested C-tracer (C) Component: The C part of the tracer codebase (_pytracer extension) labels Aug 28, 2023
@remram44
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remram44 commented Aug 29, 2023 •
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Found this thread: https://lkml.iu.edu/hypermail/linux/kernel/1712.2/04964.html

Initial testing shows that this is a problem on Linux 6.2.0-26-generic and 5.4.0-110-generic

@remram44
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Might be an issue of missing CAP_SYS_PTRACE in containers, have to re-test.

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This doesn't happen if you're root and have CAP_SYS_PTRACE (which is not the default in containers). I see it happening on GitHub Actions, have to investigate.

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A-question Attention: There is an open question for which more input is requested C-tracer (C) Component: The C part of the tracer codebase (_pytracer extension) T-bug Type: A fix for unwanted behavior, NOT a new feature or a simple enhancement
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