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13 miscellaneous and general things in the operation of the Linux
14 kernel. Since some of the files _can_ be used to screw up your
45 aio-nr is the running total of the number of events specified on the
49 of any kernel data structures.
79 The file dquot-max shows the maximum number of cached disk
82 The file dquot-nr shows the number of allocated disk quota
83 entries and the number of free disk quota entries.
85 If the number of free cached disk quotas is very low and
86 you have some awesome number of simultaneous system users,
93 The value in file-max denotes the maximum number of file-
95 of error messages about running out of file handles, you might
100 file-nr denote the number of allocated file handles, the number
101 of allocated but unused file handles, and the maximum number of
102 file handles. Linux 2.6 always reports 0 as the number of free
104 number of allocated file handles exactly matches the number of
114 This denotes the maximum number of file-handles a process can
126 The value in inode-max denotes the maximum number of inode
130 out of inodes, you need to increase this value.
136 The actual numbers are, in order of appearance, nr_inodes,
139 Nr_inodes stands for the number of inodes the system has
143 Nr_free_inodes represents the number of free inodes (?) and
145 system needs to prune the inode list instead of allocating
153 UIDs and GIDs are 32 bits. When one of these filesystems is mounted
157 These sysctls allow you to change the value of the fixed UID and GID.
164 A long-standing class of security issues is the hardlink-based
165 time-of-check-time-of-use race, most commonly seen in world-writable
166 directories like /tmp. The common method of exploitation of this flaw
184 A long-standing class of security issues is the symlink-based
185 time-of-check-time-of-use race, most commonly seen in world-writable
186 directories like /tmp. The common method of exploitation of this flaw
189 incomplete list of hundreds of examples across the years, please see:
195 a sticky world-writable directory, or when the uid of the symlink and
213 	contents of privileged processes.
223 	to syslog warning about the lack of a correct setting.
229 These numbers control the maximum number of superblocks, and
230 thus the maximum number of mounted filesystems the kernel
239 aio-nr shows the current system-wide number of asynchronous io
257 creation of a  user space  library that  implements  the  POSIX message queues
258 API (as noted by the  MSG tag in the  POSIX 1003.1-2001 version  of the System
261 The "mqueue" filesystem contains values for determining/setting  the amount of
265 maximum number of message queues allowed on the system.
268 maximum number of messages in a queue value.  In fact it is the limiting value
269 for another (user) limit which is set in mq_open invocation. This attribute of
277 default number of messages in a queue value if attr parameter of mq_open(2) is
281 the default message size value if attr parameter of mq_open(2) is NULL. If it
292 Every epoll file descriptor can store a number of files to be monitored
293 for event readiness. Each one of these monitored files constitutes a "watch".
294 This configuration option sets the maximum number of "watches" that are
298 The current default value for  max_user_watches  is the 1/32 of the available