[Bug 2828] New: Extension for BSD style advisory file locking operations

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2828

            Bug ID: 2828
           Summary: Extension for BSD style advisory file locking
                    operations
           Product: Portable OpenSSH
           Version: 7.6p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: sftp-server
          Assignee: unassigned-bugs at mindrot.org
          Reporter: github at kalvdans.no-ip.org

Created attachment 3117
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3117&action=edit
Suggested patch 1

sshfs does not currently support forwarding flock(2) operations to the
remote host.

This report is about implementing the necessary parts in the
sftp-server program. The sshfs side has its own pull request at
https://github.com/libfuse/sshfs/pull/55

The suggested patch is uploaded to

https://github.com/openssh/openssh-portable/pull/66

and also attached to this bug report.

The patch adds support for file locking operations LOCK_EX|LOCK_NB and
LOCK_SH|LOCK_NB to sftp-server. Allocate a new extension string for the
flock operations.

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