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authorDavid Howells <dhowells@redhat.com>2009-09-02 09:14:00 +0100
committerJames Morris <jmorris@namei.org>2009-09-02 21:29:11 +1000
commit5d135440faf7db8d566de0c6fab36b16cf9cfc3b (patch)
treed9c022e73ed51dfe5729fde9a97150cb64b68196 /security/keys/sysctl.c
parentf041ae2f99d49adc914153a34a2d0e14e4389d90 (diff)
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KEYS: Add garbage collection for dead, revoked and expired keys. [try #6]
Add garbage collection for dead, revoked and expired keys. This involved erasing all links to such keys from keyrings that point to them. At that point, the key will be deleted in the normal manner. Keyrings from which garbage collection occurs are shrunk and their quota consumption reduced as appropriate. Dead keys (for which the key type has been removed) will be garbage collected immediately. Revoked and expired keys will hang around for a number of seconds, as set in /proc/sys/kernel/keys/gc_delay before being automatically removed. The default is 5 minutes. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/keys/sysctl.c')
-rw-r--r--security/keys/sysctl.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/security/keys/sysctl.c b/security/keys/sysctl.c
index b611d493c2d..5e05dc09e2d 100644
--- a/security/keys/sysctl.c
+++ b/security/keys/sysctl.c
@@ -13,6 +13,8 @@
#include <linux/sysctl.h>
#include "internal.h"
+static const int zero, one = 1, max = INT_MAX;
+
ctl_table key_sysctls[] = {
{
.ctl_name = CTL_UNNUMBERED,
@@ -20,7 +22,9 @@ ctl_table key_sysctls[] = {
.data = &key_quota_maxkeys,
.maxlen = sizeof(unsigned),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = &proc_dointvec_minmax,
+ .extra1 = (void *) &one,
+ .extra2 = (void *) &max,
},
{
.ctl_name = CTL_UNNUMBERED,
@@ -28,7 +32,9 @@ ctl_table key_sysctls[] = {
.data = &key_quota_maxbytes,
.maxlen = sizeof(unsigned),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = &proc_dointvec_minmax,
+ .extra1 = (void *) &one,
+ .extra2 = (void *) &max,
},
{
.ctl_name = CTL_UNNUMBERED,
@@ -36,7 +42,9 @@ ctl_table key_sysctls[] = {
.data = &key_quota_root_maxkeys,
.maxlen = sizeof(unsigned),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = &proc_dointvec_minmax,
+ .extra1 = (void *) &one,
+ .extra2 = (void *) &max,
},
{
.ctl_name = CTL_UNNUMBERED,
@@ -44,7 +52,19 @@ ctl_table key_sysctls[] = {
.data = &key_quota_root_maxbytes,
.maxlen = sizeof(unsigned),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = &proc_dointvec_minmax,
+ .extra1 = (void *) &one,
+ .extra2 = (void *) &max,
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "gc_delay",
+ .data = &key_gc_delay,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .extra1 = (void *) &zero,
+ .extra2 = (void *) &max,
},
{ .ctl_name = 0 }
};