The kernel will mark the process as having the EACCESS or EPERM error. The kernel will also write a message to the process about the blocking event. The process must try again to chdir with a new mode, and that is likely to succeed because the process will have chmoded the directory to a permission mode that is allowed by the kernel.
The kernel will now allow the process to chdir to the new directory, and this will succeed because the kernel has allowed this same mode before. So, from this point, we know that this blocking event is in fact related to the chdir attempt. The method looks back at the chdir message to see which directory the process was trying to change into.
So, this method starts by using the clone system call, which directly creates a new process via fork(). The new process is likely to have the same UID and GID as the original process. The new process then attempts to chdir to a new directory using chdir, which is the first permission denied error. The kernel will have no idea why this happens, so it will print a cryptic error message. By examining this message, we can see the process that was trying to chdir, and since it was the kernel, we can reason backwards to the process. From this point, the method diagnoses why the kernel is giving an EPERM:
A process trying to chdir is blocked by the DETACH_SECURITY kernel security feature, which is used to limit host process chdirs to the default directories.
So, I proposed a method to apply multiple contexts to the kernel to figure out which process is causing the EPERM. I opened a discussion about this on the Debian Security Announcements mailing list .
The /proc filesystem is created and managed by the Linux kernel. /proc is a dynamic system of objects for a process's environment. As the process runs, it builds a dynamic list of objects that it needs to have access to, such as:
If you are not using --privileged, it is not possible for a process to be denied access to a resource. This is because Podman doesn't mask the kernel filesystems, so there is no reason for Podman to deny access to a resource within the container.
Let's check the kernel security settings on the IPC resource. The first value of the x character is the security status of the resource. If the value is Y, then the resource is set to the standard security level. If the value is X, the resource is in a restricted security namespace.
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