Instead of recording the Unix time in a process when it starts, record the

uptime.  Where necessary, convert it back to Unix time by adding boottime
to it.  This fixes a potential problem in the accounting code, which would
compute the elapsed time incorrectly if the Unix time was stepped during
the lifetime of the process.

1 files changed, 4 insertions, 2 deletions

diff --git a/sys/kern/kern_acct.c b/sys/kern/kern_acct.c
index 9de4641..19e5b1c 100644
--- a/sys/kern/kern_acct.c
+++ b/sys/kern/kern_acct.c
@@ -250,8 +250,10 @@ acct_process(td)
 	acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
 
 	/* (3) The elapsed time the command ran (and its starting time) */
-	acct.ac_btime = p->p_stats->p_start.tv_sec;
-	microtime(&tmp);
+	tmp = boottime;
+	timevaladd(&tmp, &p->p_stats->p_start);
+	acct.ac_btime = tmp.tv_sec;
+	microuptime(&tmp);
 	timevalsub(&tmp, &p->p_stats->p_start);
 	acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);