[Bug libc/28377] New: closefrom_fallback fails when /proc/self/fd is not present, which causes unexpected behavior with openssh

["william.wilson at canonical dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28377

            Bug ID: 28377
           Summary: closefrom_fallback fails when /proc/self/fd is not
                    present, which causes unexpected behavior with openssh
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: william.wilson at canonical dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

A valid use case of sshd is to run in a "chroot" that actually looks nothing
like a root filesystem. If this is attempted in a kernel that does not
implement the close_range syscall (5.8 or older) the fallback_closefrom
function in glibc 2.34 looks for /proc/self/fd and returns an error if it is
not found. This implementation may want to consider scenarios where
/proc/self/fd is not present.

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