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selftests/core: add test for CLOSE_RANGE_UNSHARE | CLOSE_RANGE_CLOEXEC

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Add a test to verify that CLOSE_RANGE_UNSHARE works correctly when combined
with CLOSE_RANGE_CLOEXEC for the single-threaded case.

Cc: Giuseppe Scrivano <gscrivan@redhat.com>
Cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/20201218145415.801063-3-christian.brauner@ubuntu.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2020-12-18 15:54:14 +01:00
parent ae78ba8d3b
commit fe325c3ff3
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GPG key ID: 91C61BC06578DCA2
1 changed files with 70 additions and 0 deletions
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70
tools/testing/selftests/core/close_range_test.c
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@ -313,5 +313,75 @@ TEST(close_range_cloexec)
}
}
TEST(close_range_cloexec_unshare)
{
int i, ret;
int open_fds[101];
struct rlimit rlimit;
for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
int fd;
fd = open("/dev/null", O_RDONLY);
ASSERT_GE(fd, 0) {
if (errno == ENOENT)
SKIP(return, "Skipping test since /dev/null does not exist");
}
open_fds[i] = fd;
}
ret = sys_close_range(1000, 1000, CLOSE_RANGE_CLOEXEC);
if (ret < 0) {
if (errno == ENOSYS)
SKIP(return, "close_range() syscall not supported");
if (errno == EINVAL)
SKIP(return, "close_range() doesn't support CLOSE_RANGE_CLOEXEC");
}
/* Ensure the FD_CLOEXEC bit is set also with a resource limit in place. */
ASSERT_EQ(0, getrlimit(RLIMIT_NOFILE, &rlimit));
rlimit.rlim_cur = 25;
ASSERT_EQ(0, setrlimit(RLIMIT_NOFILE, &rlimit));
/* Set close-on-exec for two ranges: [0-50] and [75-100]. */
ret = sys_close_range(open_fds[0], open_fds[50],
CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
ASSERT_EQ(0, ret);
ret = sys_close_range(open_fds[75], open_fds[100],
CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
ASSERT_EQ(0, ret);
for (i = 0; i <= 50; i++) {
int flags = fcntl(open_fds[i], F_GETFD);
EXPECT_GT(flags, -1);
EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
}
for (i = 51; i <= 74; i++) {
int flags = fcntl(open_fds[i], F_GETFD);
EXPECT_GT(flags, -1);
EXPECT_EQ(flags & FD_CLOEXEC, 0);
}
for (i = 75; i <= 100; i++) {
int flags = fcntl(open_fds[i], F_GETFD);
EXPECT_GT(flags, -1);
EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
}
/* Test a common pattern. */
ret = sys_close_range(3, UINT_MAX,
CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
for (i = 0; i <= 100; i++) {
int flags = fcntl(open_fds[i], F_GETFD);
EXPECT_GT(flags, -1);
EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
}
}
TEST_HARNESS_MAIN