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security: keys: Replace time_t/timespec with time64_t

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The 'struct key' will use 'time_t' which we try to remove in the
kernel, since 'time_t' is not year 2038 safe on 32bit systems.
Also the 'struct keyring_search_context' will use 'timespec' type
to record current time, which is also not year 2038 safe on 32bit
systems.

Thus this patch replaces 'time_t' with 'time64_t' which is year 2038
safe for 'struct key', and replace 'timespec' with 'time64_t' for the
'struct keyring_search_context', since we only look at the the seconds
part of 'timespec' variable. Moreover we also change the codes where
using the 'time_t' and 'timespec', and we can get current time by
ktime_get_real_seconds() instead of current_kernel_time(), and use
'TIME64_MAX' macro to initialize the 'time64_t' type variable.

Especially in proc.c file, we have replaced 'unsigned long' and 'timespec'
type with 'u64' and 'time64_t' type to save the timeout value, which means
user will get one 'u64' type timeout value by issuing proc_keys_show()
function.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Baolin Wang
2017-11-15 16:38:45 +00:00
committed by David Howells
parent be543dd626
commit 074d589895
8 changed files with 47 additions and 55 deletions
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7
include/linux/key.h
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@@ -24,6 +24,7 @@
#include <linux/atomic.h>
#include <linux/assoc_array.h>
#include <linux/refcount.h>
#include <linux/time64.h>
#ifdef __KERNEL__
#include <linux/uidgid.h>
@@ -162,10 +163,10 @@ struct key {
struct key_user *user; /* owner of this key */
void *security; /* security data for this key */
union {
time_t expiry; /* time at which key expires (or 0) */
time_t revoked_at; /* time at which key was revoked */
time64_t expiry; /* time at which key expires (or 0) */
time64_t revoked_at; /* time at which key was revoked */
};
time_t last_used_at; /* last time used for LRU keyring discard */
time64_t last_used_at; /* last time used for LRU keyring discard */
kuid_t uid;
kgid_t gid;
key_perm_t perm; /* access permissions */