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powerpc: rtas: clean up time handling 

The to_tm() helper function operates on a signed integer for the time,
so it will suffer from overflow in 2038, even on 64-bit kernels.

Rather than fix that function, this replaces its use in the rtas
procfs implementation with the standard rtc_time64_to_tm() helper
that is very similar but is not affected by the overflow.

In order to actually support long times, the parser function gets
changed to 64-bit user input and output as well. Note that the tm_mon
and tm_year representation is slightly different, so we have to manually
add an offset here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Arnd Bergmann 2018-04-23 10:36:39 +02:00 committed by Michael Ellerman
parent 6e8cef384a
commit 2dc20f454d
1 changed files with 12 additions and 12 deletions
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24
arch/powerpc/kernel/rtas-proc.c
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@ -280,7 +280,7 @@ static int __init proc_rtas_init(void)
__initcall(proc_rtas_init);
static int parse_number(const char __user *p, size_t count, unsigned long *val)
static int parse_number(const char __user *p, size_t count, u64 *val)
{
char buf[40];
char *end;
@ -293,7 +293,7 @@ static int parse_number(const char __user *p, size_t count, unsigned long *val)
buf[count] = 0;
*val = simple_strtoul(buf, &end, 10);
*val = simple_strtoull(buf, &end, 10);
if (*end && *end != '\n')
return -EINVAL;
@ -307,17 +307,17 @@ static ssize_t ppc_rtas_poweron_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
struct rtc_time tm;
unsigned long nowtime;
time64_t nowtime;
int error = parse_number(buf, count, &nowtime);
if (error)
return error;
power_on_time = nowtime; /* save the time */
to_tm(nowtime, &tm);
rtc_time64_to_tm(nowtime, &tm);
error = rtas_call(rtas_token("set-time-for-power-on"), 7, 1, NULL,
tm.tm_year, tm.tm_mon, tm.tm_mday,
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, 0 /* nano */);
if (error)
printk(KERN_WARNING "error: setting poweron time returned: %s\n",
@ -373,14 +373,14 @@ static ssize_t ppc_rtas_clock_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
struct rtc_time tm;
unsigned long nowtime;
time64_t nowtime;
int error = parse_number(buf, count, &nowtime);
if (error)
return error;
to_tm(nowtime, &tm);
rtc_time64_to_tm(nowtime, &tm);
error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL,
tm.tm_year, tm.tm_mon, tm.tm_mday,
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, 0);
if (error)
printk(KERN_WARNING "error: setting the clock returned: %s\n",
@ -401,8 +401,8 @@ static int ppc_rtas_clock_show(struct seq_file *m, void *v)
unsigned int year, mon, day, hour, min, sec;
year = ret[0]; mon = ret[1]; day = ret[2];
hour = ret[3]; min = ret[4]; sec = ret[5];
seq_printf(m, "%lu\n",
mktime(year, mon, day, hour, min, sec));
seq_printf(m, "%lld\n",
mktime64(year, mon, day, hour, min, sec));
}
return 0;
}
@ -731,7 +731,7 @@ static void get_location_code(struct seq_file *m, struct individual_sensor *s,
static ssize_t ppc_rtas_tone_freq_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
unsigned long freq;
u64 freq;
int error = parse_number(buf, count, &freq);
if (error)
return error;
@ -756,7 +756,7 @@ static int ppc_rtas_tone_freq_show(struct seq_file *m, void *v)
static ssize_t ppc_rtas_tone_volume_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
unsigned long volume;
u64 volume;
int error = parse_number(buf, count, &volume);
if (error)
return error;