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selftests: add F_DUPDFD_QUERY selftests

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Add simple selftests for the new F_DUPFD_QUERY fcntl().

Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-05-09 13:29:18 +02:00
parent c62b758bae
commit 4810ce7c91
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 54 additions and 1 deletions
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55
tools/testing/selftests/core/close_range_test.c
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@ -17,6 +17,15 @@
#include "../kselftest_harness.h"
#include "../clone3/clone3_selftests.h"
#ifndef F_LINUX_SPECIFIC_BASE
#define F_LINUX_SPECIFIC_BASE 1024
#endif
#ifndef F_DUPFD_QUERY
#define F_DUPFD_QUERY (F_LINUX_SPECIFIC_BASE + 3)
#endif
static inline int sys_close_range(unsigned int fd, unsigned int max_fd,
unsigned int flags)
{
@ -45,6 +54,15 @@ TEST(core_close_range)
SKIP(return, "close_range() syscall not supported");
}
for (i = 0; i < 100; i++) {
ret = fcntl(open_fds[i], F_DUPFD_QUERY, open_fds[i + 1]);
if (ret < 0) {
EXPECT_EQ(errno, EINVAL);
} else {
EXPECT_EQ(ret, 0);
}
}
EXPECT_EQ(0, sys_close_range(open_fds[0], open_fds[50], 0));
for (i = 0; i <= 50; i++)
@ -358,7 +376,7 @@ TEST(close_range_cloexec_unshare)
*/
TEST(close_range_cloexec_syzbot)
{
int fd1, fd2, fd3, flags, ret, status;
int fd1, fd2, fd3, fd4, flags, ret, status;
pid_t pid;
struct __clone_args args = {
.flags = CLONE_FILES,
@ -372,6 +390,13 @@ TEST(close_range_cloexec_syzbot)
fd2 = dup2(fd1, 1000);
EXPECT_GT(fd2, 0);
flags = fcntl(fd1, F_DUPFD_QUERY, fd2);
if (flags < 0) {
EXPECT_EQ(errno, EINVAL);
} else {
EXPECT_EQ(flags, 1);
}
pid = sys_clone3(&args, sizeof(args));
ASSERT_GE(pid, 0);
@ -396,6 +421,15 @@ TEST(close_range_cloexec_syzbot)
fd3 = dup2(fd1, 42);
EXPECT_GT(fd3, 0);
flags = fcntl(fd1, F_DUPFD_QUERY, fd3);
if (flags < 0) {
EXPECT_EQ(errno, EINVAL);
} else {
EXPECT_EQ(flags, 1);
}
/*
* Duplicating the file descriptor must remove the
* FD_CLOEXEC flag.
@ -426,6 +460,24 @@ TEST(close_range_cloexec_syzbot)
fd3 = dup2(fd1, 42);
EXPECT_GT(fd3, 0);
flags = fcntl(fd1, F_DUPFD_QUERY, fd3);
if (flags < 0) {
EXPECT_EQ(errno, EINVAL);
} else {
EXPECT_EQ(flags, 1);
}
fd4 = open("/dev/null", O_RDWR);
EXPECT_GT(fd4, 0);
/* Same inode, different file pointers. */
flags = fcntl(fd1, F_DUPFD_QUERY, fd4);
if (flags < 0) {
EXPECT_EQ(errno, EINVAL);
} else {
EXPECT_EQ(flags, 0);
}
flags = fcntl(fd3, F_GETFD);
EXPECT_GT(flags, -1);
EXPECT_EQ(flags & FD_CLOEXEC, 0);
@ -433,6 +485,7 @@ TEST(close_range_cloexec_syzbot)
EXPECT_EQ(close(fd1), 0);
EXPECT_EQ(close(fd2), 0);
EXPECT_EQ(close(fd3), 0);
EXPECT_EQ(close(fd4), 0);
}
/*