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8004495: [parfait] False positive Buffer overflow in hotspot/src/os/linux/vm/os_linux.cpp

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Delete the questionable source code because it is for no-longer supported versions of Linux.

Reviewed-by: mikael, coleenp
This commit is contained in:
Harold Seigel 2013-02-20 07:16:23 -05:00
parent 99fa0d1e99
commit 2d47fd6658
1 changed files with 2 additions and 26 deletions
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28
hotspot/src/os/linux/vm/os_linux.cpp
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@ -4743,49 +4743,26 @@ jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
//
static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
static bool proc_pid_cpu_avail = true;
static bool proc_task_unchecked = true;
static const char *proc_stat_path = "/proc/%d/stat";
pid_t tid = thread->osthread()->thread_id();
int i;
char *s;
char stat[2048];
int statlen;
char proc_name[64];
int count;
long sys_time, user_time;
char string[64];
char cdummy;
int idummy;
long ldummy;
FILE *fp;
// We first try accessing /proc/<pid>/cpu since this is faster to
// process. If this file is not present (linux kernels 2.5 and above)
// then we open /proc/<pid>/stat.
if ( proc_pid_cpu_avail ) {
sprintf(proc_name, "/proc/%d/cpu", tid);
fp = fopen(proc_name, "r");
if ( fp != NULL ) {
count = fscanf( fp, "%s %lu %lu\n", string, &user_time, &sys_time);
fclose(fp);
if ( count != 3 ) return -1;
if (user_sys_cpu_time) {
return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec);
} else {
return (jlong)user_time * (1000000000 / clock_tics_per_sec);
}
}
else proc_pid_cpu_avail = false;
}
// The /proc/<tid>/stat aggregates per-process usage on
// new Linux kernels 2.6+ where NPTL is supported.
// The /proc/self/task/<tid>/stat still has the per-thread usage.
// See bug 6328462.
// There can be no directory /proc/self/task on kernels 2.4 with NPTL
// and possibly in some other cases, so we check its availability.
// There possibly can be cases where there is no directory
// /proc/self/task, so we check its availability.
if (proc_task_unchecked && os::Linux::is_NPTL()) {
// This is executed only once
proc_task_unchecked = false;
@ -4810,7 +4787,6 @@ static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
// We don't really need to know the command string, just find the last
// occurrence of ")" and then start parsing from there. See bug 4726580.
s = strrchr(stat, ')');
i = 0;
if (s == NULL ) return -1;
// Skip blank chars