139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2020 Cyril Hrubis <chrubis@suse.cz>
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*/
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/*
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* [Description]
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*
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* After a call to unshare(CLONE_NEWTIME) a new timer namespace is created, the
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* process that has called the unshare() can adjust offsets for CLOCK_MONOTONIC
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* and CLOCK_BOOTTIME for its children by writing to the '/proc/self/timens_offsets'.
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*
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* The child processes also switch to the initial parent namespace and checks
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* that the offset is set to 0.
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*/
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#define _GNU_SOURCE
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#include "time64_variants.h"
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#include "tst_safe_clocks.h"
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#include "tst_timer.h"
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#include "lapi/namespaces_constants.h"
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static struct tcase {
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int clk_id;
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int clk_off;
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int off;
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} tcases[] = {
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{CLOCK_MONOTONIC, CLOCK_MONOTONIC, 10},
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{CLOCK_BOOTTIME, CLOCK_BOOTTIME, 10},
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{CLOCK_MONOTONIC, CLOCK_MONOTONIC, -10},
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{CLOCK_BOOTTIME, CLOCK_BOOTTIME, -10},
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{CLOCK_MONOTONIC_RAW, CLOCK_MONOTONIC, 100},
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{CLOCK_MONOTONIC_COARSE, CLOCK_MONOTONIC, 100},
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};
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static struct tst_ts now, then, parent_then;
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static int parent_ns;
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static struct time64_variants variants[] = {
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{ .clock_gettime = libc_clock_gettime, .ts_type = TST_LIBC_TIMESPEC, .desc = "vDSO or syscall with libc spec"},
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#if (__NR_clock_gettime != __LTP__NR_INVALID_SYSCALL)
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{ .clock_gettime = sys_clock_gettime, .ts_type = TST_KERN_OLD_TIMESPEC, .desc = "syscall with old kernel spec"},
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#endif
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#if (__NR_clock_gettime64 != __LTP__NR_INVALID_SYSCALL)
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{ .clock_gettime = sys_clock_gettime64, .ts_type = TST_KERN_TIMESPEC, .desc = "syscall time64 with kernel spec"},
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#endif
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};
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static void child(struct time64_variants *tv, struct tcase *tc)
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{
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long long diff;
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if (tv->clock_gettime(tc->clk_id, tst_ts_get(&then))) {
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tst_res(TFAIL | TERRNO, "clock_gettime(%s) failed",
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tst_clock_name(tc->clk_id));
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return;
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}
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SAFE_SETNS(parent_ns, CLONE_NEWTIME);
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if (tv->clock_gettime(tc->clk_id, tst_ts_get(&parent_then))) {
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tst_res(TFAIL | TERRNO, "clock_gettime(%s) failed",
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tst_clock_name(tc->clk_id));
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return;
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}
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diff = tst_ts_diff_ms(then, now);
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if (diff - tc->off * 1000 > 10) {
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tst_res(TFAIL, "Wrong offset (%s) read %llims",
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tst_clock_name(tc->clk_id), diff);
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} else {
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tst_res(TPASS, "Offset (%s) is correct %llims",
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tst_clock_name(tc->clk_id), diff);
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}
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diff = tst_ts_diff_ms(parent_then, now);
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if (diff > 10) {
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tst_res(TFAIL, "Wrong offset (%s) read %llims",
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tst_clock_name(tc->clk_id), diff);
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} else {
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tst_res(TPASS, "Offset (%s) is correct %llims",
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tst_clock_name(tc->clk_id), diff);
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}
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}
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static void verify_ns_clock(unsigned int n)
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{
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struct time64_variants *tv = &variants[tst_variant];
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struct tcase *tc = &tcases[n];
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SAFE_UNSHARE(CLONE_NEWTIME);
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SAFE_FILE_PRINTF("/proc/self/timens_offsets", "%d %d 0",
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tc->clk_off, tc->off);
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if (tv->clock_gettime(tc->clk_id, tst_ts_get(&now))) {
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tst_res(TFAIL | TERRNO, "%d clock_gettime(%s) failed",
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__LINE__, tst_clock_name(tc->clk_id));
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return;
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}
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if (!SAFE_FORK())
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child(tv, tc);
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}
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static void setup(void)
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{
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struct time64_variants *tv = &variants[tst_variant];
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now.type = then.type = parent_then.type = tv->ts_type;
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tst_res(TINFO, "Testing variant: %s", variants[tst_variant].desc);
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parent_ns = SAFE_OPEN("/proc/self/ns/time_for_children", O_RDONLY);
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}
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static void cleanup(void)
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{
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SAFE_CLOSE(parent_ns);
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}
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static struct tst_test test = {
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.setup = setup,
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.cleanup = cleanup,
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.tcnt = ARRAY_SIZE(tcases),
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.test = verify_ns_clock,
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.test_variants = ARRAY_SIZE(variants),
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.needs_root = 1,
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.forks_child = 1,
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.needs_kconfigs = (const char *[]) {
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"CONFIG_TIME_NS=y",
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NULL
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}
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};
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