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proc, time/namespace: Show clock symbolic names in /proc/pid/timens_offsets 

Michael Kerrisk suggested to replace numeric clock IDs with symbolic names.

Now the content of these files looks like this:
$ cat /proc/774/timens_offsets
monotonic      864000         0
boottime      1728000         0

For setting offsets, both representations of clocks (numeric and symbolic)
can be used.

As for compatibility, it is acceptable to change things as long as
userspace doesn't care. The format of timens_offsets files is very new and
there are no userspace tools yet which rely on this format.

But three projects crun, util-linux and criu rely on the interface of
setting time offsets and this is why it's required to continue supporting
the numeric clock IDs on write.

Fixes: 04a8682a71 ("fs/proc: Introduce /proc/pid/timens_offsets")
Suggested-by: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200411154031.642557-1-avagin@gmail.com
This commit is contained in:
Andrei Vagin 2020-04-11 08:40:31 -07:00 committed by Thomas Gleixner
parent 8f3d9f3542
commit 94d440d618
2 changed files with 27 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/proc/base.c
View File

@ -1573,6 +1573,7 @@ static ssize_t timens_offsets_write(struct file *file, const char __user *buf,
noffsets = 0;
for (pos = kbuf; pos; pos = next_line) {
struct proc_timens_offset *off = &offsets[noffsets];
char clock[10];
int err;
/* Find the end of line and ensure we don't look past it */
@ -1584,10 +1585,21 @@ static ssize_t timens_offsets_write(struct file *file, const char __user *buf,
next_line = NULL;
}
err = sscanf(pos, "%u %lld %lu", &off->clockid,
err = sscanf(pos, "%9s %lld %lu", clock,
&off->val.tv_sec, &off->val.tv_nsec);
if (err != 3 || off->val.tv_nsec >= NSEC_PER_SEC)
goto out;
clock[sizeof(clock) - 1] = 0;
if (strcmp(clock, "monotonic") == 0 ||
strcmp(clock, __stringify(CLOCK_MONOTONIC)) == 0)
off->clockid = CLOCK_MONOTONIC;
else if (strcmp(clock, "boottime") == 0 ||
strcmp(clock, __stringify(CLOCK_BOOTTIME)) == 0)
off->clockid = CLOCK_BOOTTIME;
else
goto out;
noffsets++;
if (noffsets == ARRAY_SIZE(offsets)) {
if (next_line)

15
kernel/time/namespace.c
View File

@ -338,7 +338,20 @@ static struct user_namespace *timens_owner(struct ns_common *ns)
static void show_offset(struct seq_file *m, int clockid, struct timespec64 *ts)
{
seq_printf(m, "%d %lld %ld\n", clockid, ts->tv_sec, ts->tv_nsec);
char *clock;
switch (clockid) {
case CLOCK_BOOTTIME:
clock = "boottime";
break;
case CLOCK_MONOTONIC:
clock = "monotonic";
break;
default:
clock = "unknown";
break;
}
seq_printf(m, "%-10s %10lld %9ld\n", clock, ts->tv_sec, ts->tv_nsec);
}
void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m)