Regression issue in v28.5.2

[hosamaly]

We use the atmoz/sftp image as a Testcontainer in CI tests via docker:dind. Since the release of v28.5.2, we've been getting a peculiar error:

SFTP error (SSH_FX_PERMISSION_DENIED): Permission denied
	at app//org.apache.sshd.sftp.client.impl.AbstractSftpClient.throwStatusException(AbstractSftpClient.java:277)
	at app//org.apache.sshd.sftp.client.impl.AbstractSftpClient.checkHandleResponse(AbstractSftpClient.java:299)
	at app//org.apache.sshd.sftp.client.impl.AbstractSftpClient.checkHandle(AbstractSftpClient.java:290)
	at app//org.apache.sshd.sftp.client.impl.AbstractSftpClient.open(AbstractSftpClient.java:589)
	at app//org.apache.sshd.sftp.client.impl.SftpOutputStreamAsync.<init>(SftpOutputStreamAsync.java:63)
	at app//org.apache.sshd.sftp.client.impl.AbstractSftpClient.write(AbstractSftpClient.java:1213)
	at app//org.apache.sshd.sftp.client.SftpClient.write(SftpClient.java:940)

We're getting this error whether the application is reading, writing, or listing files, as you can see in the list of failed tests below.

Reverting to docker:28.5.1-dind fixes the issue and allows our CI pipeline to pass.

[hosamaly]

The container is created using the Testcontainers library in Java:

import org.testcontainers.containers.GenericContainer;

new GenericContainer<>("atmoz/sftp:alpine")
        .withExposedPorts(22)
        .withTmpFs(Map.of("/home/user/sftp-share", "rw"))
        .withCommand("user:password:::sftp-share")
        .start();

[tianon]

I bet this is opencontainers/runc#4971 👀