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tzcode: Test escape from TZDIR

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Test a value of TZ that temporarily escapes from TZDIR (which is not
permitted when setugid) then reenters it.

MFC after:	3 days

(cherry picked from commit cf76bfbb235116702ea1689bf984f200a72d2790)
This commit is contained in:
Dag-Erling Smørgrav 2025-09-29 14:36:24 +02:00
parent 4048c39cfa
commit cbb155ce4e
1 changed files with 26 additions and 13 deletions
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39
lib/libc/tests/stdtime/detect_tz_changes_test.c
View file

@ -24,10 +24,12 @@
#include <atf-c.h>
static const struct tzcase {
struct tzcase {
const char *tzfn;
const char *expect;
} tzcases[] = {
};
static const struct tzcase tzcases[] = {
/*
* A handful of time zones and the expected result of
* strftime("%z (%Z)", tm) when that time zone is active
@ -43,7 +45,8 @@ static const struct tzcase {
{ "UTC", "+0000 (UTC)" },
{ 0 },
};
static const struct tzcase utc = { "UTC", "+0000 (UTC)" };
static const struct tzcase invalid = { "invalid", "+0000 (-00)" };
static const time_t then = 1751328000; /* 2025-07-01 00:00:00 UTC */
static bool debugging;
@ -139,7 +142,7 @@ ATF_TC_BODY(tz_invalid_file, tc)
ATF_REQUIRE_EQ(0, chdir("/"));
/* check timezone */
unsetenv("TZ");
test_tz("+0000 (-00)");
test_tz(invalid.expect);
}
ATF_TC(thin_jail);
@ -366,12 +369,8 @@ test_tz_env(const char *tzval, const char *expect)
test_tz(expect);
}
ATF_TC(tz_env);
ATF_TC_HEAD(tz_env, tc)
{
atf_tc_set_md_var(tc, "descr", "Test TZ environment variable");
}
ATF_TC_BODY(tz_env, tc)
static void
tz_env_common(void)
{
char path[MAXPATHLEN];
const struct tzcase *tzcase = tzcases;
@ -394,6 +393,18 @@ ATF_TC_BODY(tz_env, tc)
}
}
ATF_TC(tz_env);
ATF_TC_HEAD(tz_env, tc)
{
atf_tc_set_md_var(tc, "descr", "Test TZ environment variable");
}
ATF_TC_BODY(tz_env, tc)
{
tz_env_common();
/* escape from TZDIR is permitted when not setugid */
test_tz_env("../zoneinfo/UTC", utc.expect);
}
ATF_TC(tz_invalid_env);
ATF_TC_HEAD(tz_invalid_env, tc)
@ -403,8 +414,8 @@ ATF_TC_HEAD(tz_invalid_env, tc)
}
ATF_TC_BODY(tz_invalid_env, tc)
{
test_tz_env("invalid", "+0000 (-00)");
test_tz_env(":invalid", "+0000 (-00)");
test_tz_env("invalid", invalid.expect);
test_tz_env(":invalid", invalid.expect);
}
ATF_TC(setugid);
@ -443,7 +454,9 @@ ATF_TC_BODY(tz_env_setugid, tc)
{
ATF_REQUIRE_EQ(0, seteuid(UID_NOBODY));
ATF_REQUIRE(issetugid());
ATF_TC_BODY_NAME(tz_env)(tc);
tz_env_common();
/* escape from TZDIR is not permitted when setugid */
test_tz_env("../zoneinfo/UTC", invalid.expect);
}
ATF_TP_ADD_TCS(tp)