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selftests/landlock: Fully test file rename with "remove" access

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These tests were missing to check the check_access_path() call with all
combinations of maybe_remove(old_dentry) and maybe_remove(new_dentry).

Extend layout1.link with a new complementary test and check that
REMOVE_FILE is not required to link a file.

Cc: Shuah Khan <shuah@kernel.org>
Link: https://lore.kernel.org/r/20220506160820.524344-7-mic@digikod.net
Cc: stable@vger.kernel.org
Signed-off-by: Mickaël Salaün <mic@digikod.net>
This commit is contained in:
Mickaël Salaün 2022-05-06 18:08:16 +02:00
parent d18955d094
commit 6a1bdd4a0b
No known key found for this signature in database
GPG Key ID: E5E3D0E88C82F6D2
1 changed files with 37 additions and 4 deletions
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41
tools/testing/selftests/landlock/fs_test.c
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@ -1659,15 +1659,21 @@ TEST_F_FORK(layout1, execute)
TEST_F_FORK(layout1, link)
{
const struct rule rules[] = {
const struct rule layer1[] = {
{
.path = dir_s1d2,
.access = LANDLOCK_ACCESS_FS_MAKE_REG,
},
{},
};
const int ruleset_fd =
create_ruleset(_metadata, rules[0].access, rules);
const struct rule layer2[] = {
{
.path = dir_s1d3,
.access = LANDLOCK_ACCESS_FS_REMOVE_FILE,
},
{},
};
int ruleset_fd = create_ruleset(_metadata, layer1[0].access, layer1);
ASSERT_LE(0, ruleset_fd);
@ -1680,14 +1686,30 @@ TEST_F_FORK(layout1, link)
ASSERT_EQ(-1, link(file2_s1d1, file1_s1d1));
ASSERT_EQ(EACCES, errno);
/* Denies linking because of reparenting. */
ASSERT_EQ(-1, link(file1_s2d1, file1_s1d2));
ASSERT_EQ(EXDEV, errno);
ASSERT_EQ(-1, link(file2_s1d2, file1_s1d3));
ASSERT_EQ(EXDEV, errno);
ASSERT_EQ(-1, link(file2_s1d3, file1_s1d2));
ASSERT_EQ(EXDEV, errno);
ASSERT_EQ(0, link(file2_s1d2, file1_s1d2));
ASSERT_EQ(0, link(file2_s1d3, file1_s1d3));
/* Prepares for next unlinks. */
ASSERT_EQ(0, unlink(file2_s1d2));
ASSERT_EQ(0, unlink(file2_s1d3));
ruleset_fd = create_ruleset(_metadata, layer2[0].access, layer2);
ASSERT_LE(0, ruleset_fd);
enforce_ruleset(_metadata, ruleset_fd);
ASSERT_EQ(0, close(ruleset_fd));
/* Checks that linkind doesn't require the ability to delete a file. */
ASSERT_EQ(0, link(file1_s1d2, file2_s1d2));
ASSERT_EQ(0, link(file1_s1d3, file2_s1d3));
}
TEST_F_FORK(layout1, rename_file)
@ -1708,7 +1730,6 @@ TEST_F_FORK(layout1, rename_file)
ASSERT_LE(0, ruleset_fd);
ASSERT_EQ(0, unlink(file1_s1d1));
ASSERT_EQ(0, unlink(file1_s1d2));
enforce_ruleset(_metadata, ruleset_fd);
@ -1744,9 +1765,15 @@ TEST_F_FORK(layout1, rename_file)
ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s2d2, AT_FDCWD, file1_s2d1,
RENAME_EXCHANGE));
ASSERT_EQ(EACCES, errno);
/* Checks that file1_s2d1 cannot be removed (instead of ENOTDIR). */
ASSERT_EQ(-1, rename(dir_s2d2, file1_s2d1));
ASSERT_EQ(EACCES, errno);
ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s2d1, AT_FDCWD, dir_s2d2,
RENAME_EXCHANGE));
ASSERT_EQ(EACCES, errno);
/* Checks that file1_s1d1 cannot be removed (instead of EISDIR). */
ASSERT_EQ(-1, rename(file1_s1d1, dir_s1d2));
ASSERT_EQ(EACCES, errno);
/* Renames files with different parents. */
ASSERT_EQ(-1, rename(file1_s2d2, file1_s1d2));
@ -1809,9 +1836,15 @@ TEST_F_FORK(layout1, rename_dir)
ASSERT_EQ(-1, renameat2(AT_FDCWD, dir_s1d1, AT_FDCWD, dir_s2d1,
RENAME_EXCHANGE));
ASSERT_EQ(EACCES, errno);
/* Checks that dir_s1d2 cannot be removed (instead of ENOTDIR). */
ASSERT_EQ(-1, rename(dir_s1d2, file1_s1d1));
ASSERT_EQ(EACCES, errno);
ASSERT_EQ(-1, renameat2(AT_FDCWD, file1_s1d1, AT_FDCWD, dir_s1d2,
RENAME_EXCHANGE));
ASSERT_EQ(EACCES, errno);
/* Checks that dir_s1d2 cannot be removed (instead of EISDIR). */
ASSERT_EQ(-1, rename(file1_s1d1, dir_s1d2));
ASSERT_EQ(EACCES, errno);
/*
* Exchanges and renames directory to the same parent, which allows