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Convert from time in minutes to timespec directly instead of

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converting to double via strtod().  This makes it easier to catch
overflow.
This commit is contained in:
Todd C. Miller 2018-01-26 10:17:47 -07:00
parent eb8b5c7964
commit bcfb092a4e
1 changed files with 53 additions and 18 deletions
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71
plugins/sudoers/defaults.c
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@ -164,10 +164,10 @@ dump_defaults(void)
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
break;
case T_TIMESPEC: {
/* display time spec in minutes as a double */
double d = cur->sd_un.tspec.tv_sec / 60.0;
d += cur->sd_un.tspec.tv_nsec / 1000000000.0;
sudo_printf(SUDO_CONV_INFO_MSG, desc, d);
/* display timespec in minutes as a double */
double d = cur->sd_un.tspec.tv_sec +
(cur->sd_un.tspec.tv_nsec / 1000000000.0);
sudo_printf(SUDO_CONV_INFO_MSG, desc, d * 60.0);
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
break;
}
@ -851,26 +851,61 @@ store_uint(const char *str, union sudo_defs_val *sd_un)
debug_return_bool(true);
}
#ifndef TIME_T_MAX
# if SIZEOF_TIME_T == 8
# define TIME_T_MAX LLONG_MAX
# else
# define TIME_T_MAX INT_MAX
# endif
#endif
static bool
store_timespec(const char *str, union sudo_defs_val *sd_un)
{
char *endp;
double d;
struct timespec ts;
char sign = '+';
int i;
debug_decl(store_timespec, SUDOERS_DEBUG_DEFAULTS)
if (str == NULL) {
sd_un->tspec.tv_sec = 0;
sd_un->tspec.tv_nsec = 0;
sudo_timespecclear(&ts);
if (str != NULL) {
/* Convert from minutes to timespec. */
if (*str == '+' || *str == '-')
sign = *str++;
while (*str != '\0' && *str != '.') {
if (!isdigit((unsigned char)*str))
debug_return_bool(false); /* invalid number */
if (ts.tv_sec > TIME_T_MAX / 10)
debug_return_bool(false); /* overflow */
ts.tv_sec *= 10;
ts.tv_sec += *str++ - '0';
}
if (*str++ == '.') {
/* Convert optional fractional component to nanosecs. */
for (i = 100000000; i > 0; i /= 10) {
if (*str == '\0')
break;
if (!isdigit((unsigned char)*str))
debug_return_bool(false); /* invalid number */
ts.tv_nsec += i * (*str++ - '0');
}
}
/* Convert from minutes to seconds. */
if (ts.tv_sec > TIME_T_MAX / 60)
debug_return_bool(false); /* overflow */
ts.tv_sec *= 60;
ts.tv_nsec *= 60;
while (ts.tv_nsec >= 1000000000) {
ts.tv_sec++;
ts.tv_nsec -= 1000000000;
}
}
if (sign == '-') {
sd_un->tspec.tv_sec = -ts.tv_sec;
sd_un->tspec.tv_nsec = -ts.tv_nsec;
} else {
d = strtod(str, &endp);
if (*endp != '\0')
debug_return_bool(false);
/* XXX - should check against HUGE_VAL */
/* Convert from minutes to seconds and nanoseconds. */
d *= 60.0;
sd_un->tspec.tv_sec = (time_t)d;
sd_un->tspec.tv_nsec = (long)((d - sd_un->tspec.tv_sec) * 1000000000.0);
sd_un->tspec.tv_sec = ts.tv_sec;
sd_un->tspec.tv_nsec = ts.tv_nsec;
}
debug_return_bool(true);
}