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    SubjectRe: posix capabilities inheritance
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    On Thursday, 23-Oct-2003 at 17:5 CDT, "Michael Glasgow" wrote:

    > The code to drop privs is not hard, but it's also not trivial.

    Here's an example code sequence that demonstrates how a setuid-to-root
    application could drop all capabilities except for CAP_IPC_LOCK and
    then run with the non-privileged uid:

    #include <sys/prctl.h>
    #include <sys/capability.h>

    ...

    cap_t c;

    if (prctl(PR_SET_KEEPCAPS, 1UL, 0UL, 0UL, 0UL) < 0 ||
    seteuid(getuid()) < 0 ||
    !(c = cap_from_text("cap_ipc_lock=eip")) ||
    cap_set_proc(c) < 0)
    /* handle error */;

    However, I agree that it's often not viable to require application
    changes to achieve the desired result.

    Cheers. -ernie
    -
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