Try entering namespace if chroot fails #42
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DrDaveD
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I confirmed that this problem was due to a recent change in kernels, as I had previously suspected. It was probably a security fix. I tested it on my rocky9 vagrant box and at first the chroot succeeded, but then I did a |
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I updated my sl7 machine to the latest kernel and it still does not fail the chroot. |
DrDaveD
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djw8605
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Oct 27, 2023
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What kernel version triggers this problem? And do you know yet what version of cvmfs-x509-helper will include the fix? |
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I'm not sure exactly which older kernel versions don't trigger it, but at least 4.18.0-477.27.1.el8_8.x86_64 and 5.14.0-284.30.1.el9_2.x86_64 have the problem. The fix is in cvmfs-x509-helper-2.4. |
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LIGO has found that on el8, access from within an unprivileged apptainer container fails to be able to read a proxy if it is at a non-standard path specified by X509_USER_PROXY. That's because the chroot into the root path of the process fails. This adds an alternative, an equivalent of
nsenter -U --preserve-credentials -m, and opens the file there.