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selftests: core: add tests for CLOSE_RANGE_CLOEXEC 

check that close_range(initial_fd, last_fd, CLOSE_RANGE_CLOEXEC)
correctly sets the close-on-exec bit for the specified file
descriptors.

Open 100 file descriptors and set the close-on-exec flag for a subset
of them first, then set it for every file descriptor above 2.  Make
sure RLIMIT_NOFILE doesn't affect the result.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Link: https://lore.kernel.org/r/20201118104746.873084-3-gscrivan@redhat.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Giuseppe Scrivano 2020-11-18 11:47:46 +01:00 committed by Christian Brauner
parent 582f1fb6b7
commit 23afeaeff3
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1 changed files with 74 additions and 0 deletions
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74
tools/testing/selftests/core/close_range_test.c
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@ -11,6 +11,7 @@
#include <string.h>
#include <syscall.h>
#include <unistd.h>
#include <sys/resource.h>
#include "../kselftest_harness.h"
#include "../clone3/clone3_selftests.h"
@ -23,6 +24,10 @@
#define CLOSE_RANGE_UNSHARE (1U << 1)
#endif
#ifndef CLOSE_RANGE_CLOEXEC
#define CLOSE_RANGE_CLOEXEC (1U << 2)
#endif
static inline int sys_close_range(unsigned int fd, unsigned int max_fd,
unsigned int flags)
{
@ -224,4 +229,73 @@ TEST(close_range_unshare_capped)
EXPECT_EQ(0, WEXITSTATUS(status));
}
TEST(close_range_cloexec)
{
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)
XFAIL(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)
XFAIL(return, "close_range() syscall not supported");
if (errno == EINVAL)
XFAIL(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);
ASSERT_EQ(0, ret);
ret = sys_close_range(open_fds[75], open_fds[100], CLOSE_RANGE_CLOEXEC);
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);
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