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tomoyo: fix timestamping for y2038

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Tomoyo uses an open-coded version of time_to_tm() to create a timestamp
from the current time as read by get_seconds(). This will overflow and
give wrong results on 32-bit systems in 2038.

To correct this, this changes the code to use ktime_get_real_seconds()
and the generic time64_to_tm() function that are both y2038-safe.
Using the library function avoids adding an expensive 64-bit division
in this code and can benefit from any optimizations we do in common
code.

Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Arnd Bergmann
2017-10-19 14:29:04 +02:00
committed by James Morris
parent dbbbe1105e
commit 927340926e
4 changed files with 13 additions and 34 deletions
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4
security/tomoyo/common.c
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@@ -2256,7 +2256,7 @@ static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
/* Timestamp counter for last updated. */
static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
/* Counter for number of updates. */
static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
/**
* tomoyo_update_stat - Update statistic counters.
@@ -2271,7 +2271,7 @@ void tomoyo_update_stat(const u8 index)
* I don't use atomic operations because race condition is not fatal.
*/
tomoyo_stat_updated[index]++;
tomoyo_stat_modified[index] = get_seconds();
tomoyo_stat_modified[index] = ktime_get_real_seconds();
}
/**