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On Sat, Dec 17, 2016 at 3:22 PM, Ian Zimmerman <itz@×××××××.net> wrote: |
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> On a detour from the setuid X problem, I wanted to play with Linux |
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> capabilities. But the simplest possible example from libcap README |
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> fails: |
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> |
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> root@matica ~ # getcap /bin/ping |
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> Failed to get capabilities of file `/bin/ping' (Operation not supported) |
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> root@matica ~ # |
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> |
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> Any idea what could be wrong? It looks like the kernel code is always |
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> built in nowadays - there is no kernel build option or loadable module |
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> that I might have forgotten. |
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|
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Google suggests that it might be an issue with filesystem xattrs. |
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Does your filesystem support these? There are a few ways of setting |
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process capabilities, but the one getcap is looking at requires |
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setting xattrs on the binary so that linux will drop caps when it |
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exec's it. |
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|
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-- |
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Rich |
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