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Commite530be2

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Do not allow removal of superuser privileges from bootstrap user.
A bootstrap user who is not a superuser will still own manyimportant system objects, such as the pg_catalog schema, thatwill likely allow that user to regain superuser status. Therefore,allowing the superuser property to be removed from the superusercreates a false perception of security where none exists.Although removing superuser from the bootstrap user is also a bad ideaand should be considered unsupported in all released versions, noback-patch, as this is a behavior change.Discussion:http://postgr.es/m/CA+TgmoZirCwArJms_fgvLBFrC6b=HdxmG7iAhv+kt_=NBA7tEw@mail.gmail.com
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‎src/backend/commands/user.c

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -693,7 +693,14 @@ AlterRole(ParseState *pstate, AlterRoleStmt *stmt)
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*/
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if (dissuper)
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{
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new_record[Anum_pg_authid_rolsuper-1]=BoolGetDatum(boolVal(dissuper->arg));
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boolshould_be_super=BoolGetDatum(boolVal(dissuper->arg));
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if (!should_be_super&&roleid==BOOTSTRAP_SUPERUSERID)
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied: bootstrap user must be superuser")));
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new_record[Anum_pg_authid_rolsuper-1]=should_be_super;
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new_record_repl[Anum_pg_authid_rolsuper-1]= true;
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}
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