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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/xattr.h>
#include <linux/fsverity.h>
#include <unistd.h>
#include <test_progs.h>
#include "test_get_xattr.skel.h"
#include "test_fsverity.skel.h"
static const char testfile[] = "/tmp/test_progs_fs_kfuncs";
static void test_xattr(void)
{
struct test_get_xattr *skel = NULL;
int fd = -1, err;
int v[32];
fd = open(testfile, O_CREAT | O_RDONLY, 0644);
if (!ASSERT_GE(fd, 0, "create_file"))
return;
close(fd);
fd = -1;
err = setxattr(testfile, "user.kfuncs", "hello", sizeof("hello"), 0);
if (err && errno == EOPNOTSUPP) {
printf("%s:SKIP:local fs doesn't support xattr (%d)\n"
"To run this test, make sure /tmp filesystem supports xattr.\n",
__func__, errno);
test__skip();
goto out;
}
if (!ASSERT_OK(err, "setxattr"))
goto out;
skel = test_get_xattr__open_and_load();
if (!ASSERT_OK_PTR(skel, "test_get_xattr__open_and_load"))
goto out;
skel->bss->monitored_pid = getpid();
err = test_get_xattr__attach(skel);
if (!ASSERT_OK(err, "test_get_xattr__attach"))
goto out;
fd = open(testfile, O_RDONLY, 0644);
if (!ASSERT_GE(fd, 0, "open_file"))
goto out;
ASSERT_EQ(skel->bss->found_xattr_from_file, 1, "found_xattr_from_file");
/* Trigger security_inode_getxattr */
err = getxattr(testfile, "user.kfuncs", v, sizeof(v));
ASSERT_EQ(err, -1, "getxattr_return");
ASSERT_EQ(errno, EINVAL, "getxattr_errno");
ASSERT_EQ(skel->bss->found_xattr_from_dentry, 1, "found_xattr_from_dentry");
out:
close(fd);
test_get_xattr__destroy(skel);
remove(testfile);
}
#ifndef SHA256_DIGEST_SIZE
#define SHA256_DIGEST_SIZE 32
#endif
static void test_fsverity(void)
{
struct fsverity_enable_arg arg = {0};
struct test_fsverity *skel = NULL;
struct fsverity_digest *d;
int fd, err;
char buffer[4096];
fd = open(testfile, O_CREAT | O_RDWR, 0644);
if (!ASSERT_GE(fd, 0, "create_file"))
return;
/* Write random buffer, so the file is not empty */
err = write(fd, buffer, 4096);
if (!ASSERT_EQ(err, 4096, "write_file"))
goto out;
close(fd);
/* Reopen read-only, otherwise FS_IOC_ENABLE_VERITY will fail */
fd = open(testfile, O_RDONLY, 0644);
if (!ASSERT_GE(fd, 0, "open_file1"))
return;
/* Enable fsverity for the file.
* If the file system doesn't support verity, this will fail. Skip
* the test in such case.
*/
arg.version = 1;
arg.hash_algorithm = FS_VERITY_HASH_ALG_SHA256;
arg.block_size = 4096;
err = ioctl(fd, FS_IOC_ENABLE_VERITY, &arg);
if (err) {
printf("%s:SKIP:local fs doesn't support fsverity (%d)\n"
"To run this test, try enable CONFIG_FS_VERITY and enable FSVerity for the filesystem.\n",
__func__, errno);
test__skip();
goto out;
}
skel = test_fsverity__open_and_load();
if (!ASSERT_OK_PTR(skel, "test_fsverity__open_and_load"))
goto out;
/* Get fsverity_digest from ioctl */
d = (struct fsverity_digest *)skel->bss->expected_digest;
d->digest_algorithm = FS_VERITY_HASH_ALG_SHA256;
d->digest_size = SHA256_DIGEST_SIZE;
err = ioctl(fd, FS_IOC_MEASURE_VERITY, skel->bss->expected_digest);
if (!ASSERT_OK(err, "ioctl_FS_IOC_MEASURE_VERITY"))
goto out;
skel->bss->monitored_pid = getpid();
err = test_fsverity__attach(skel);
if (!ASSERT_OK(err, "test_fsverity__attach"))
goto out;
/* Reopen the file to trigger the program */
close(fd);
fd = open(testfile, O_RDONLY);
if (!ASSERT_GE(fd, 0, "open_file2"))
goto out;
ASSERT_EQ(skel->bss->got_fsverity, 1, "got_fsverity");
ASSERT_EQ(skel->bss->digest_matches, 1, "digest_matches");
out:
close(fd);
test_fsverity__destroy(skel);
remove(testfile);
}
void test_fs_kfuncs(void)
{
if (test__start_subtest("xattr"))
test_xattr();
if (test__start_subtest("fsverity"))
test_fsverity();
}
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