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Landlock updates for v6.8-rc1 

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Merge tag 'landlock-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux

Pull Landlock updates from Mickaël Salaün:
 "New tests, a slight optimization, and some cosmetic changes"

* tag 'landlock-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux:
  landlock: Optimize the number of calls to get_access_mask slightly
  selftests/landlock: Rename "permitted" to "allowed" in ftruncate tests
  landlock: Remove remaining "inline" modifiers in .c files [v6.6]
  landlock: Remove remaining "inline" modifiers in .c files [v6.1]
  landlock: Remove remaining "inline" modifiers in .c files [v5.15]
  selftests/landlock: Add tests to check unhandled rule's access rights
  selftests/landlock: Add tests to check unknown rule's access rights
This commit is contained in:
Linus Torvalds 2024-01-09 13:22:15 -08:00
parent 063a7ce32d 0daaa610c8
commit e9b4c58908
4 changed files with 145 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
security/landlock/fs.c
View File

@ -193,7 +193,7 @@ int landlock_append_fs_rule(struct landlock_ruleset *const ruleset,
*
* Returns NULL if no rule is found or if @dentry is negative.
*/
static inline const struct landlock_rule *
static const struct landlock_rule *
find_rule(const struct landlock_ruleset *const domain,
const struct dentry *const dentry)
{
@ -220,7 +220,7 @@ find_rule(const struct landlock_ruleset *const domain,
* sockfs, pipefs), but can still be reachable through
* /proc/<pid>/fd/<file-descriptor>
*/
static inline bool is_nouser_or_private(const struct dentry *dentry)
static bool is_nouser_or_private(const struct dentry *dentry)
{
return (dentry->d_sb->s_flags & SB_NOUSER) ||
(d_is_positive(dentry) &&
@ -264,7 +264,7 @@ static const struct landlock_ruleset *get_current_fs_domain(void)
*
* @layer_masks_child2: Optional child masks.
*/
static inline bool no_more_access(
static bool no_more_access(
const layer_mask_t (*const layer_masks_parent1)[LANDLOCK_NUM_ACCESS_FS],
const layer_mask_t (*const layer_masks_child1)[LANDLOCK_NUM_ACCESS_FS],
const bool child1_is_directory,
@ -316,7 +316,7 @@ static inline bool no_more_access(
*
* Returns true if the request is allowed, false otherwise.
*/
static inline bool
static bool
scope_to_request(const access_mask_t access_request,
layer_mask_t (*const layer_masks)[LANDLOCK_NUM_ACCESS_FS])
{
@ -335,7 +335,7 @@ scope_to_request(const access_mask_t access_request,
* Returns true if there is at least one access right different than
* LANDLOCK_ACCESS_FS_REFER.
*/
static inline bool
static bool
is_eacces(const layer_mask_t (*const layer_masks)[LANDLOCK_NUM_ACCESS_FS],
const access_mask_t access_request)
{
@ -551,9 +551,9 @@ jump_up:
return allowed_parent1 && allowed_parent2;
}
static inline int check_access_path(const struct landlock_ruleset *const domain,
const struct path *const path,
access_mask_t access_request)
static int check_access_path(const struct landlock_ruleset *const domain,
const struct path *const path,
access_mask_t access_request)
{
layer_mask_t layer_masks[LANDLOCK_NUM_ACCESS_FS] = {};
@ -565,8 +565,8 @@ static inline int check_access_path(const struct landlock_ruleset *const domain,
return -EACCES;
}
static inline int current_check_access_path(const struct path *const path,
const access_mask_t access_request)
static int current_check_access_path(const struct path *const path,
const access_mask_t access_request)
{
const struct landlock_ruleset *const dom = get_current_fs_domain();
@ -575,7 +575,7 @@ static inline int current_check_access_path(const struct path *const path,
return check_access_path(dom, path, access_request);
}
static inline access_mask_t get_mode_access(const umode_t mode)
static access_mask_t get_mode_access(const umode_t mode)
{
switch (mode & S_IFMT) {
case S_IFLNK:
@ -600,7 +600,7 @@ static inline access_mask_t get_mode_access(const umode_t mode)
}
}
static inline access_mask_t maybe_remove(const struct dentry *const dentry)
static access_mask_t maybe_remove(const struct dentry *const dentry)
{
if (d_is_negative(dentry))
return 0;
@ -1086,7 +1086,7 @@ static int hook_path_truncate(const struct path *const path)
* Returns the access rights that are required for opening the given file,
* depending on the file type and open mode.
*/
static inline access_mask_t
static access_mask_t
get_required_file_open_access(const struct file *const file)
{
access_mask_t access = 0;

7
security/landlock/ruleset.c
View File

@ -305,7 +305,7 @@ int landlock_insert_rule(struct landlock_ruleset *const ruleset,
return insert_rule(ruleset, id, &layers, ARRAY_SIZE(layers));
}
static inline void get_hierarchy(struct landlock_hierarchy *const hierarchy)
static void get_hierarchy(struct landlock_hierarchy *const hierarchy)
{
if (hierarchy)
refcount_inc(&hierarchy->usage);
@ -723,11 +723,12 @@ landlock_init_layer_masks(const struct landlock_ruleset *const domain,
/* Saves all handled accesses per layer. */
for (layer_level = 0; layer_level < domain->num_layers; layer_level++) {
const unsigned long access_req = access_request;
const access_mask_t access_mask =
get_access_mask(domain, layer_level);
unsigned long access_bit;
for_each_set_bit(access_bit, &access_req, num_access) {
if (BIT_ULL(access_bit) &
get_access_mask(domain, layer_level)) {
if (BIT_ULL(access_bit) & access_mask) {
(*layer_masks)[access_bit] |=
BIT_ULL(layer_level);
handled_accesses |= BIT_ULL(access_bit);

80
tools/testing/selftests/landlock/fs_test.c
View File

@ -589,7 +589,7 @@ TEST_F_FORK(layout1, file_and_dir_access_rights)
ASSERT_EQ(0, close(ruleset_fd));
}
TEST_F_FORK(layout0, unknown_access_rights)
TEST_F_FORK(layout0, ruleset_with_unknown_access)
{
__u64 access_mask;
@ -605,6 +605,67 @@ TEST_F_FORK(layout0, unknown_access_rights)
}
}
TEST_F_FORK(layout0, rule_with_unknown_access)
{
__u64 access;
struct landlock_path_beneath_attr path_beneath = {};
const struct landlock_ruleset_attr ruleset_attr = {
.handled_access_fs = ACCESS_ALL,
};
const int ruleset_fd =
landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
ASSERT_LE(0, ruleset_fd);
path_beneath.parent_fd =
open(TMP_DIR, O_PATH | O_DIRECTORY | O_CLOEXEC);
ASSERT_LE(0, path_beneath.parent_fd);
for (access = 1ULL << 63; access != ACCESS_LAST; access >>= 1) {
path_beneath.allowed_access = access;
EXPECT_EQ(-1, landlock_add_rule(ruleset_fd,
LANDLOCK_RULE_PATH_BENEATH,
&path_beneath, 0));
EXPECT_EQ(EINVAL, errno);
}
ASSERT_EQ(0, close(path_beneath.parent_fd));
ASSERT_EQ(0, close(ruleset_fd));
}
TEST_F_FORK(layout1, rule_with_unhandled_access)
{
struct landlock_ruleset_attr ruleset_attr = {
.handled_access_fs = LANDLOCK_ACCESS_FS_EXECUTE,
};
struct landlock_path_beneath_attr path_beneath = {};
int ruleset_fd;
__u64 access;
ruleset_fd =
landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
ASSERT_LE(0, ruleset_fd);
path_beneath.parent_fd = open(file1_s1d2, O_PATH | O_CLOEXEC);
ASSERT_LE(0, path_beneath.parent_fd);
for (access = 1; access > 0; access <<= 1) {
int err;
path_beneath.allowed_access = access;
err = landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH,
&path_beneath, 0);
if (access == ruleset_attr.handled_access_fs) {
EXPECT_EQ(0, err);
} else {
EXPECT_EQ(-1, err);
EXPECT_EQ(EINVAL, errno);
}
}
EXPECT_EQ(0, close(path_beneath.parent_fd));
EXPECT_EQ(0, close(ruleset_fd));
}
static void add_path_beneath(struct __test_metadata *const _metadata,
const int ruleset_fd, const __u64 allowed_access,
const char *const path)
@ -3627,7 +3688,7 @@ FIXTURE_TEARDOWN(ftruncate)
FIXTURE_VARIANT(ftruncate)
{
const __u64 handled;
const __u64 permitted;
const __u64 allowed;
const int expected_open_result;
const int expected_ftruncate_result;
};
@ -3636,7 +3697,7 @@ FIXTURE_VARIANT(ftruncate)
FIXTURE_VARIANT_ADD(ftruncate, w_w) {
/* clang-format on */
.handled = LANDLOCK_ACCESS_FS_WRITE_FILE,
.permitted = LANDLOCK_ACCESS_FS_WRITE_FILE,
.allowed = LANDLOCK_ACCESS_FS_WRITE_FILE,
.expected_open_result = 0,
.expected_ftruncate_result = 0,
};
@ -3645,7 +3706,7 @@ FIXTURE_VARIANT_ADD(ftruncate, w_w) {
FIXTURE_VARIANT_ADD(ftruncate, t_t) {
/* clang-format on */
.handled = LANDLOCK_ACCESS_FS_TRUNCATE,
.permitted = LANDLOCK_ACCESS_FS_TRUNCATE,
.allowed = LANDLOCK_ACCESS_FS_TRUNCATE,
.expected_open_result = 0,
.expected_ftruncate_result = 0,
};
@ -3654,7 +3715,7 @@ FIXTURE_VARIANT_ADD(ftruncate, t_t) {
FIXTURE_VARIANT_ADD(ftruncate, wt_w) {
/* clang-format on */
.handled = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE,
.permitted = LANDLOCK_ACCESS_FS_WRITE_FILE,
.allowed = LANDLOCK_ACCESS_FS_WRITE_FILE,
.expected_open_result = 0,
.expected_ftruncate_result = EACCES,
};
@ -3663,8 +3724,7 @@ FIXTURE_VARIANT_ADD(ftruncate, wt_w) {
FIXTURE_VARIANT_ADD(ftruncate, wt_wt) {
/* clang-format on */
.handled = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE,
.permitted = LANDLOCK_ACCESS_FS_WRITE_FILE |
LANDLOCK_ACCESS_FS_TRUNCATE,
.allowed = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE,
.expected_open_result = 0,
.expected_ftruncate_result = 0,
};
@ -3673,7 +3733,7 @@ FIXTURE_VARIANT_ADD(ftruncate, wt_wt) {
FIXTURE_VARIANT_ADD(ftruncate, wt_t) {
/* clang-format on */
.handled = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_TRUNCATE,
.permitted = LANDLOCK_ACCESS_FS_TRUNCATE,
.allowed = LANDLOCK_ACCESS_FS_TRUNCATE,
.expected_open_result = EACCES,
};
@ -3683,7 +3743,7 @@ TEST_F_FORK(ftruncate, open_and_ftruncate)
const struct rule rules[] = {
{
.path = path,
.access = variant->permitted,
.access = variant->allowed,
},
{},
};
@ -3724,7 +3784,7 @@ TEST_F_FORK(ftruncate, open_and_ftruncate_in_different_processes)
const struct rule rules[] = {
{
.path = path,
.access = variant->permitted,
.access = variant->allowed,
},
{},
};

59
tools/testing/selftests/landlock/net_test.c
View File

@ -1260,7 +1260,7 @@ TEST_F(mini, network_access_rights)
}
/* Checks invalid attribute, out of landlock network access range. */
TEST_F(mini, unknown_access_rights)
TEST_F(mini, ruleset_with_unknown_access)
{
__u64 access_mask;
@ -1276,6 +1276,63 @@ TEST_F(mini, unknown_access_rights)
}
}
TEST_F(mini, rule_with_unknown_access)
{
const struct landlock_ruleset_attr ruleset_attr = {
.handled_access_net = ACCESS_ALL,
};
struct landlock_net_port_attr net_port = {
.port = sock_port_start,
};
int ruleset_fd;
__u64 access;
ruleset_fd =
landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
ASSERT_LE(0, ruleset_fd);
for (access = 1ULL << 63; access != ACCESS_LAST; access >>= 1) {
net_port.allowed_access = access;
EXPECT_EQ(-1,
landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
&net_port, 0));
EXPECT_EQ(EINVAL, errno);
}
EXPECT_EQ(0, close(ruleset_fd));
}
TEST_F(mini, rule_with_unhandled_access)
{
struct landlock_ruleset_attr ruleset_attr = {
.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP,
};
struct landlock_net_port_attr net_port = {
.port = sock_port_start,
};
int ruleset_fd;
__u64 access;
ruleset_fd =
landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
ASSERT_LE(0, ruleset_fd);
for (access = 1; access > 0; access <<= 1) {
int err;
net_port.allowed_access = access;
err = landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
&net_port, 0);
if (access == ruleset_attr.handled_access_net) {
EXPECT_EQ(0, err);
} else {
EXPECT_EQ(-1, err);
EXPECT_EQ(EINVAL, errno);
}
}
EXPECT_EQ(0, close(ruleset_fd));
}
TEST_F(mini, inval)
{
const struct landlock_ruleset_attr ruleset_attr = {