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kprobe: fall back to tracefs if kernel doesn't support dots in PMU symbol #605

Merged
merged 3 commits into from Mar 30, 2022
Merged

kprobe: fall back to tracefs if kernel doesn't support dots in PMU symbol #605

merged 3 commits into from Mar 30, 2022

Commits on Mar 30, 2022

  1. link/kprobe: Sanitize kprobe symbol for tracefs 

    Since we allow `.` in symbol names, we need to sanitize
those symbols to please tracefs.

Signed-off-by: Hengqi Chen <chenhengqi@outlook.com>
    @chenhengqi @ti-mo
    chenhengqi authored and ti-mo committed Mar 30, 2022
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  2. link/kprobe: Allow fallback to tracefs on old kernels 

    Centos 8 (with kernel 4.18) has kprobe PMU support, but
don't allow `.` in symbol name. Detect such cases and
fallback to tracefs interface.

Signed-off-by: Hengqi Chen <chenhengqi@outlook.com>
    @chenhengqi @ti-mo
    chenhengqi authored and ti-mo committed Mar 30, 2022
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  3. link: test - attach k(ret)probe to optimized kernel symbols containin… 

    …g dots

These are all local symbols that visible in /proc/kallsyms and traceable
by kprobes. Make sure the library supports attaching to these.

Signed-off-by: Timo Beckers <timo@isovalent.com>
    @ti-mo
    ti-mo committed Mar 30, 2022
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