Probe matcher: don't fail on missing files #2433
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minipli-oss
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fbs and
BurntBrunch
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viktormalik
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Nov 21, 2022
Even though we rely on ftrace's function tracing functionality to list available probe functions, bpftrace can work without these, e.g. when making use of tracepoints only. Right now `bpftrace -l` will die with a std::runtime_error exception if called on a kernel that lacks CONFIG_FUNCTION_TRACER. This isn't exactly user friendly. Instead of dying by throwing an exception, emit a warning and keep on going. This makes bpftrace usable on systems that lack CONFIG_FUNCTION_TRACER and/or CONFIG_EVENT_TRACING -- with limited functionality, of course! Signed-off-by: Mathias Krause <minipli@grsecurity.net>
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Thanks for the review! I added the changelog entry and updated the branch. |
viktormalik
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Nov 22, 2022
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Even though we rely on ftrace's function tracing functionality to list available probe functions, bpftrace can work without these, e.g. when making use of tracepoints only.
Right now
bpftrace -lwill die with astd::runtime_errorexception if called on a kernel that lacksCONFIG_FUNCTION_TRACER. This isn't exactly user friendly.Instead of dying by throwing an exception, emit a warning and keep on going.
This makes bpftrace usable on systems that lack
CONFIG_FUNCTION_TRACERand/orCONFIG_EVENT_TRACING-- with limited functionality, of course!Signed-off-by: Mathias Krause minipli@grsecurity.net
Checklist
man/adoc/bpftrace.adocand if needed indocs/reference_guide.mdCHANGELOG.md