SECURITY.md: Create SECURITY.md

This duplicates the (non CVE) content from doc/security

Signed-off-by: Sage Weil <sage@newdream.net>

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+# Security Policy
+
+The information below, as well as information about past
+vulnerabilities, can be found at
+
+  https://docs.ceph.com/en/latest/security/
+
+## Supported Versions
+
+A new major Ceph release is made every year, and security and bug fixes
+are backported to the last two releases.  For the current active
+releases and the estimated end-of-life for each, please refer to
+
+  https://docs.ceph.com/en/latest/releases/
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please send email to
+
+  security@ceph.io
+
+* Please do not file a public ceph tracker issue for a vulnerability.
+* We urge reporters to provide as much information as is practical
+  (a reproducer, versions affected, fix if available, etc.), as this
+  can speed up the process considerably.
+* Please let us know to whom credit should be given and with what
+  affiliations.
+* If this issue is not yet disclosed publicly and you have any
+  disclosure date in mind, please share the same along with the
+  report.
+
+## Vulnerability management process
+
+ * The report will be acknowledged within three business days or less.
+ * The team will investigate and update the email thread with relevant
+   information and may ask for additional information or guidance
+  surrounding the reported issue.
+* If the team does not confirm the report, no further action will be
+  taken and the issue will be closed.
+* If the team confirms the report, a unique CVE identifier will be
+  assigned and shared with the reporter. The team will take action to
+  fix the issue.
+* If a reporter has no disclosure date in mind, a Ceph security team
+  member will coordinate a release date (CRD) with the list members
+  and share the mutually agreed disclosure date with the reporter.
+* The vulnerability disclosure / release date is set excluding Friday and
+  holiday periods.
+* Embargoes are preferred for Critical and High impact
+  issues. Embargo should not be held for more than 90 days from the
+  date of vulnerability confirmation, except under unusual
+  circumstances. For Low and Moderate issues with limited impact and
+  an easy workaround or where an issue that is already public, a
+  standard patch release process will be followed to fix the
+  vulnerability once CVE is assigned.
+* Medium and Low severity issues will be released as part of the next
+  standard release cycle, with at least a 7 days advanced
+  notification to the list members prior to the release date. The CVE
+  fix details will be included in the release notes, which will be
+  linked in the public announcement.
+* Commits will be handled in a private repository for review and
+  testing and a new patch version will be released from this private
+  repository.
+* If a vulnerability is unintentionally already fixed in the public
+  repository, a few days are given to downstream stakeholders/vendors
+  to prepare for updating before the public disclosure.
+* An announcement will be made disclosing the vulnerability. The
+  fastest place to receive security announcements is via the
+  ceph-announce@ceph.io or oss-security@lists.openwall.com mailing
+  lists.  (These lists are low-traffic).
+
+If the report is considered embargoed, we ask you to not disclose the
+vulnerability before it has been fixed and announced, unless you
+received a response from the Ceph security team that you can do
+so. This holds true until the public disclosure date that was agreed
+upon by the list. Thank you for improving the security of Ceph and its
+ecosystem. Your efforts and responsible disclosure are greatly
+appreciated and will be acknowledged.