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authorPatrick Steinhardt <ps@pks.im>2017-07-06 22:47:16 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2017-07-06 22:47:16 +0200
commitad63102943d3f648b37b65f5c734b2c345a3b280 (patch)
tree444262f9af66ab40a9669bb906241bb8df9124ba /libbb
parent10c53b85c992afca47e7a70f05379a5038bdaeb9 (diff)
downloadbusybox-ad63102943d3f648b37b65f5c734b2c345a3b280.tar.gz
setpriv: dump inheritable capability set
The setpriv executable from util-linux also dumps out information on the different capability sets known by the kernel. By default, these are the inheritable capabilities, bounding capabilities and (not yet released) the ambient capabilities, which have been introduced with Linux 4.3. This patch introduces the ability to dump the set of inheritable capabilities. By default, setpriv(1) identifies capabilities by their human-readable name, for example 'net_admin'. For unknown capabilities, though, it does instead use the capability's value, for example 'cap_12', which is equivalent to 'net_admin'. As there is no kernel interface to retrieve capability names by their index, we have to declare these ourselves, which adds to setpriv's size. To counteract, using the human-readble name has been made configurable. The following sizes are with the 'FEATURE_SETPRIV_CAPABILITY_NAMES' enabled: function old new delta .rodata 145969 146405 +436 setpriv_main 467 842 +375 capabilities - 304 +304 And with 'FEATURE_SETPRIV_CAPABILITY_NAMES' disabled: function old new delta setpriv_main 467 838 +371 .rodata 145969 146101 +132 Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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