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keys: make the keyring quotas controllable through /proc/sys

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Make the keyring quotas controllable through /proc/sys files:

 (*) /proc/sys/kernel/keys/root_maxkeys
     /proc/sys/kernel/keys/root_maxbytes

     Maximum number of keys that root may have and the maximum total number of
     bytes of data that root may have stored in those keys.

 (*) /proc/sys/kernel/keys/maxkeys
     /proc/sys/kernel/keys/maxbytes

     Maximum number of keys that each non-root user may have and the maximum
     total number of bytes of data that each of those users may have stored in
     their keys.

Also increase the quotas as a number of people have been complaining that it's
not big enough.  I'm not sure that it's big enough now either, but on the
other hand, it can now be set in /etc/sysctl.conf.

Signed-off-by: David Howells <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Howells 2008-04-29 01:01:32 -07:00 • committed by Linus Torvalds
commit 0b77f5bfb4
9 changed files with 131 additions and 16 deletions
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24
Documentation/keys.txt
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@ -170,7 +170,8 @@ The key service provides a number of features besides keys:
amount of description and payload space that can be consumed.
The user can view information on this and other statistics through procfs
files.
files. The root user may also alter the quota limits through sysctl files
(see the section "New procfs files").
Process-specific and thread-specific keyrings are not counted towards a
user's quota.
@ -329,6 +330,27 @@ about the status of the key service:
<bytes>/<max> Key size quota
Four new sysctl files have been added also for the purpose of controlling the
quota limits on keys:
(*) /proc/sys/kernel/keys/root_maxkeys
/proc/sys/kernel/keys/root_maxbytes
These files hold the maximum number of keys that root may have and the
maximum total number of bytes of data that root may have stored in those
keys.
(*) /proc/sys/kernel/keys/maxkeys
/proc/sys/kernel/keys/maxbytes
These files hold the maximum number of keys that each non-root user may
have and the maximum total number of bytes of data that each of those
users may have stored in their keys.
Root may alter these by writing each new limit as a decimal number string to
the appropriate file.
===============================
USERSPACE SYSTEM CALL INTERFACE
===============================