https://bugzilla.mindrot.org/show_bug.cgi?id=3349
Bug ID: 3349
Summary: Test sshd in chroot fails when syscall close_range is
undefined and openssh is built with glibc 2.34
Product: Portable OpenSSH
Version: 8.7p1
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: sshd
Assignee: [email protected]
Reporter: [email protected]
Created attachment 3548
--> https://bugzilla.mindrot.org/attachment.cgi?id=3548&action=edit
failed ssh and sshd logs
This was discovered due to a failing test: regress/sftp-chroot. The
host kernel is 5.4, and a container is using glibc 2.34 to build
openssh. When attempting to start sshd in the chroot, the libc
fallback_closefrom function attempts to read /proc/self/fd, which is
not present in the chroot. This glibc implementation of closefrom
proceeds to fail silently, causing the sftp-chroot test to fail.
The test works on kernels with close_range defined, because the
fallback is never reached. I have so far recreated the failure on
amd64, arm64, and armhf. The attached logs are from an amd64 failure.
Running ./configure with ac_cv_func_closefrom=no resolves this failure.
We will be doing this in Ubuntu for the time being, but if there is a
better solution for handling this glibc implementation of closefrom we
will implement that instead.
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