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Securing Disk Files
Safeguard User’s Guide — 422089-020
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The TRUST Attribute
The TRUST Attribute
The TRUST attribute enables the operating system to optimize I/O performance and
applies only to object files. It is available only in H-series RVUs and can be set only by
the super ID.
On systems running H-series R
VUs, these two types of user I/O buffer access should
not be performed:
•
Reading from a nowaited I/O buffer that has an ongoing read operation
•
Writing to an I/O buffer that has any type of ongoing operation
These actions are detected and prevented by the operating system. The prevention
mechanism detects the access, suspends the process until the I/O operation has
completed, and then resumes the process. This suspend/resume behavior can
significantly affect process performance.
The TRUST attribute informs the operating system that the process can be “trusted”
not to access I/O buffers in the preceding manner. The system will bypass the
checking behavior, thus improving performance.
The TRUST attribute has three settings:
•
TRUST OFF specifies that the program is not to be trusted. The initial value of the
TRUST attribute is OFF.
•
TRUST ME specifies that the program can be trusted not to access I/O buffers
private to the process before I/O completion.
•
TRUST SHARED specifies that the program can be trusted not to access buffers
private to the process, or shared with another process that also has TRUST
SHARED set, before I/O completion.
To set the TRUST attribute of the program file progfile used in the previous example:
=ALTER DISKFILE progfile, TRUST SHARED
- Safeguard User’s Guide 1
- Document History 2
- Legal Notices 3
- 4. Securing Subvolumes 6
- 7. Working With SAFECOM 6
- 8. Changing Display Options 7
- 9. Working with Patterns 7
- Tables (continued) 9
- Contents 10
- What’s New in This Manual 11
- PRIV-LOGON 12
- About This Manual 15
- Notation Conventions 16
- General Syntax Notation 17
- Notation for Messages 18
- Change Bar Notation 20
- HP Encourages Your Comments 20
- Subsystem 21
- User Authentication 22
- Object Authorization 22
- Security 24
- 2 Safeguard Logon Dialog 29
- Using the LOGON Command 30
- Safeguard Logon Dialog 31
- Guardian User’s Guide 32
- Logging On With -STOP Option 33
- Logging On to a Remote System 34
- 3 Securing Disk Files 35
- Securing Disk Files 36
- Getting Started 37
- Granting Access 46
- Denying Access 46
- Example 1: 47
- Example 2: 47
- Example 3: 47
- Specifying Ownership 50
- The CLEARONPURGE Attribute 51
- The PERSISTENT Attribute 52
- The LICENSE Attribute 53
- The PROGID Attribute 54
- The TRUST Attribute 55
- 4 Securing Subvolumes 59
- Commands Used With Subvolumes 60
- Securing Processes and 61
- Subprocesses 61
- Protecting Processes 62
- Obtaining User and Alias 63
- Information 63
- 7 Working With SAFECOM 71
- Working With SAFECOM 72
- Checking Your Progress 73
- Getting Online Help 75
- Displaying Previous Commands 77
- Executing a Specific Command 78
- Displaying a Specific Command 78
- Exiting SAFECOM 80
- Using SAFECOM in Batch Mode 81
- Commands 85
- Restrictions 86
- Abbreviating SAFECOM Commands 87
- Checking Command Syntax Only 88
- 8 Changing Display Options 89
- Changing Display Options 90
- Editing Your SAFECOM Prompt 90
- 9 Working with Patterns 97
- Pattern Examples 98
- Pattern Generality 99
- One-Dimensional Search 100
- Multi-Dimensional Search 100
- Working with Patterns 101
- ACL, FIRST-RULE, and ALL 105
- Diskfile is Volume-First 105
- Examples 107
- ADD DISKFILE-PATTERN 108
- ALTER DISKFILE-PATTERN 109
- DELETE DISKFILE-PATTERN 109
- FREEZE DISKFILE-PATTERN 109
- INFO DISKFILE-PATTERN 109
- Finding Added Patterns 109
- RESET DISKFILE-PATTERN 111
- SET DISKFILE-PATTERN 111
- SHOW DISKFILE-PATTERN 112
- THAW DISKFILE-PATTERN 112
- ADD SAVED-DISKFILE-PATTERN 113
- ALTER SAVED-DISKFILE-PATTERN 113
- DELETE SAVED-DISKFILE-PATTERN 114
- FREEZE SAVED-DISKFILE-PATTERN 114
- INFO SAVED-DISKFILE-PATTERN 114
- RESET SAVED-DISKFILE-PATTERN 115
- SET SAVED-DISKFILE-PATTERN 115
- SHOW SAVED-DISKFILE-PATTERN 116
- THAW SAVED-DISKFILE-PATTERN 116
- A Guardian File Security 117
- Displaying Default Security 118
- Changing Default Security 118
- Displaying File Security 119
- Sample Procedures 119
- Guardian File Security 120
- B Protecting Your Terminal 123
- Protecting Your Terminal 124
- Logging Off 124
- C SAFECOM Command Syntax 125
- SAFECOM Command Syntax 126
- Glossary 133
- Glossary - 2 134
- Index - 1 135
- Index - 2 136
- Index - 3 137
- Special Characters 138
- = (equal sign) 139
- SAFECOM command prompt 7-1 139
- ? (question mark) command 139
- Index - 6 140
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