Messages in this thread | | | Date | Tue, 19 Apr 2011 10:14:57 +0900 | Subject | Re: Linux capabilities shouldn't be lost during setuid to non-root from root or to another non-root uid from a non-root uid. | From | crocket <> |
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Is there an existing utility that sets SECBIT_NO_SETUID_FIXUP? Or is there a way to set it without writing a C wrapper program?
On Tue, Apr 19, 2011 at 7:02 AM, Serge E. Hallyn <serge@hallyn.com> wrote: > Quoting crocket (crockabiscuit@gmail.com): >> I have several questions. >> >> 1) How do I set SECBIT_NO_SETUID_FIXUP? > > prctl(PR_SET_SECUREBITS, SECBIT_NO_SETUID_FIXUP | SECBIT_NO_SETUID_FIXUP_LOCKED) > > see capabilities(7) for details. > >> 2) Is there any reason to unset SECBIT_NO_SETUID_FIXUP by default? > > Yes, because it's what userspace expects. If you prefer to run in > a full POSIX capabilities environment with unprivileged root, you > can have init set SECBIT_NO_SETUID_FIXUP and SECBIT_NOROOT and > tune userspace to do the right thing, but it's not trivial. > > -serge > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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