On Friday October 3 2008 12:12:15 am Robert Connolly wrote: > Another suid-root dropped: > > chmod -s /bin/su > setcap CAP_DAC_READ_SEARCH,CAP_SETUID,CAP_SETGID=ep /bin/su > > robert
/bin/su seems to want to reset the gid, and probably the uid, of /etc/shadow, according to Strace. Regardless of the comments in /usr/include/linux/capability.h, it looks like CAP_DAC_READ_SEARCH allows writting to /etc/shadow. If I remove CAP_DAC_READ_SEARCH, and make /etc/shadow group read/writable, /bin/su works. Each has pros and cons, and I don't know which is better. This might be a bug in CAP_DAC_READ_SEARCH... somehow FOWNER was mixed in. Opinions, debug help? robert
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