On 2015/12/20 18:47, Eric W. Biederman wrote: > Dongsheng Yang <yangds.f...@cn.fujitsu.com> writes: > >> On 12/20/2015 10:37 AM, Al Viro wrote: >>> On Sun, Dec 20, 2015 at 10:14:29AM +0800, Dongsheng Yang wrote: >>>> On 12/17/2015 07:23 PM, Dongsheng Yang wrote: >>>>> Hi guys, >>>>> We are working on making core dump behaviour isolated in >>>>> container. But the problem is, the /proc/sys/kernel/core_pattern >>>>> is a kernel wide setting, not belongs to a container. >>>>> >>>>> So we want to add core_pattern into mnt namespace. What >>>>> do you think about it? >>>> >>>> Hi Eric, >>>> I found your patch about "net: Implement the per network namespace >>>> sysctl infrastructure", I want to do the similar thing >>>> in mnt namespace. Is that suggested way? >>> >>> Why mnt namespace and not something else? >> >> Hi Al, >> >> Well, because core_pattern indicates the path to store core file. >> In different mnt namespace, we would like to change the path with >> different value. >> >> In addition, Let's considering other namespaces: >> UTS ns: contains informations of kernel and arch, not proper for >> core_pattern. >> IPC ns: communication informations, not proper for core_pattern >> PID ns: core_pattern is not related with pid >> net ns: obviousely no. >> user ns: not proper too. >> >> Then I believe it's better to do this in mnt namespace. of course, >> core_pattern is just one example. After this infrastructure finished, >> we can implement more sysctls as per-mnt if necessary, I think. >> >> Al, what do you think about this idea? > > The hard part is not the sysctl. The hard part is starting the usermode > helper, in an environment that it can deal with. The mount namespace > really provides you with no help there. > Let me ask. I think user-mode-helper shouldn be found in container's namespace. Or Do you mean running user-mode-helper out of a container ?
I think if a user need to send cores to outside of a container, a file descriptor or a network end point should be able to be passed to sysctl. Thanks, -Kame > Eric > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
