fusefs: implement VOP_ACCESS
VOP_ACCESS was never fully implemented in fusefs. This change: * Removes the FACCESS_DO_ACCESS flag, which pretty much disabled the whole vop. * Removes a quixotic special case for VEXEC on regular files. I don't know why that was in there. * Removes another confusing special case for VADMIN. * Removes the FACCESS_NOCHECKSPY flag. It seemed to be a performance optimization, but I'm unconvinced that it was a net positive. * Updates test cases. This change does NOT implement -o default_permissions. That will be handled separately. PR: 236291 Sponsored by: The FreeBSD Foundation
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/projects/fuse2/; revision=345962
@ -115,7 +115,7 @@ fuse_internal_access(struct vnode *vp,
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struct ucred *cred)
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{
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int err = 0;
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uint32_t mask = 0;
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uint32_t mask = F_OK;
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int dataflags;
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int vtype;
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struct mount *mp;
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@ -123,13 +123,6 @@ fuse_internal_access(struct vnode *vp,
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struct fuse_access_in *fai;
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struct fuse_data *data;
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/* NOT YET DONE */
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/*
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* If this vnop gives you trouble, just return 0 here for a lazy
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* kludge.
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*/
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/* return 0;*/
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mp = vnode_mount(vp);
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vtype = vnode_vtype(vp);
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@ -139,65 +132,37 @@ fuse_internal_access(struct vnode *vp,
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if ((mode & VWRITE) && vfs_isrdonly(mp)) {
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return EROFS;
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}
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/* Unless explicitly permitted, deny everyone except the fs owner. */
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if (!(facp->facc_flags & FACCESS_NOCHECKSPY)) {
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if (!(dataflags & FSESS_DAEMON_CAN_SPY)) {
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int denied = fuse_match_cred(data->daemoncred,
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cred);
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if (denied) {
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/* Unless explicitly permitted, deny everyone except the fs owner. */
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if (!(facp->facc_flags)) {
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if (!(dataflags & FSESS_DAEMON_CAN_SPY)) {
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int denied = fuse_match_cred(data->daemoncred, cred);
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if (denied)
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return EPERM;
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}
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}
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/*
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* Set the "skip cred check" flag so future callers that share
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* facp can skip fuse_match_cred.
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*/
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facp->facc_flags |= FACCESS_NOCHECKSPY;
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}
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if (!(facp->facc_flags & FACCESS_DO_ACCESS)) {
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return 0;
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}
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if (((vtype == VREG) && (mode & VEXEC))) {
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#ifdef NEED_MOUNT_ARGUMENT_FOR_THIS
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/* Let the kernel handle this through open / close heuristics.*/
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return ENOTSUP;
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#else
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/* Let the kernel handle this. */
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return 0;
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#endif
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}
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if (!fsess_isimpl(mp, FUSE_ACCESS)) {
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/* Let the kernel handle this. */
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return 0;
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}
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if (dataflags & FSESS_DEFAULT_PERMISSIONS) {
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/* Let the kernel handle this. */
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/* TODO: Implement me! Bug 216391 */
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return 0;
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}
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if ((mode & VADMIN) != 0) {
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err = priv_check_cred(cred, PRIV_VFS_ADMIN);
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if (err) {
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return err;
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}
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}
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if ((mode & (VWRITE | VAPPEND | VADMIN)) != 0) {
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if (!fsess_isimpl(mp, FUSE_ACCESS))
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return 0;
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if ((mode & (VWRITE | VAPPEND | VADMIN)) != 0)
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mask |= W_OK;
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}
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if ((mode & VREAD) != 0) {
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if ((mode & VREAD) != 0)
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mask |= R_OK;
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}
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if ((mode & VEXEC) != 0) {
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if ((mode & VEXEC) != 0)
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mask |= X_OK;
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}
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bzero(&fdi, sizeof(fdi));
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fdisp_init(&fdi, sizeof(*fai));
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fdisp_make_vp(&fdi, FUSE_ACCESS, vp, td, cred);
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fai = fdi.indata;
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fai->mask = F_OK;
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fai->mask |= mask;
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fai->mask = mask;
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err = fdisp_wait_answ(&fdi);
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fdisp_destroy(&fdi);
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@ -155,7 +155,6 @@ fuse_iosize(struct vnode *vp)
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#define FVP_ACCESS_NOOP 0x01
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#define FACCESS_VA_VALID 0x01
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#define FACCESS_DO_ACCESS 0x02
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/*
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* Caller must be the directory's owner, or the superuser, or the sticky bit
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* must not be set
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@ -163,7 +162,6 @@ fuse_iosize(struct vnode *vp)
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#define FACCESS_STICKY 0x04
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/* Caller requires access to change file's owner */
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#define FACCESS_CHOWN 0x08
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#define FACCESS_NOCHECKSPY 0x10
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#define FACCESS_SETGID 0x12
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#define FACCESS_XQUERIES (FACCESS_STICKY | FACCESS_CHOWN | FACCESS_SETGID)
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@ -55,14 +55,14 @@ virtual void SetUp() {
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};
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/* The error case of FUSE_ACCESS. */
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/* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236291 */
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TEST_F(Access, DISABLED_eaccess)
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TEST_F(Access, eaccess)
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{
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const char FULLPATH[] = "mountpoint/some_file.txt";
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const char RELPATH[] = "some_file.txt";
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uint64_t ino = 42;
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mode_t access_mode = X_OK;
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expect_access(1, X_OK, 0);
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expect_lookup(RELPATH, ino);
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expect_access(ino, access_mode, EACCES);
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@ -75,17 +75,15 @@ TEST_F(Access, DISABLED_eaccess)
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* and subsequent VOP_ACCESS calls will succeed automatically without querying
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* the daemon.
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*/
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/* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236557 */
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/* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236291 */
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TEST_F(Access, DISABLED_enosys)
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TEST_F(Access, enosys)
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{
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const char FULLPATH[] = "mountpoint/some_file.txt";
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const char RELPATH[] = "some_file.txt";
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uint64_t ino = 42;
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mode_t access_mode = R_OK;
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expect_lookup(RELPATH, ino);
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expect_access(ino, access_mode, ENOSYS);
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expect_access(1, X_OK, ENOSYS);
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FuseTest::expect_lookup(RELPATH, ino, S_IFREG | 0644, 0, 2);
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ASSERT_EQ(0, access(FULLPATH, access_mode)) << strerror(errno);
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ASSERT_EQ(0, access(FULLPATH, access_mode)) << strerror(errno);
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@ -98,6 +96,7 @@ TEST_F(RofsAccess, erofs)
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uint64_t ino = 42;
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mode_t access_mode = W_OK;
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expect_access(1, X_OK, 0);
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expect_lookup(RELPATH, ino);
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ASSERT_NE(0, access(FULLPATH, access_mode));
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@ -105,14 +104,14 @@ TEST_F(RofsAccess, erofs)
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}
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/* The successful case of FUSE_ACCESS. */
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/* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236291 */
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TEST_F(Access, DISABLED_ok)
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TEST_F(Access, ok)
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{
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const char FULLPATH[] = "mountpoint/some_file.txt";
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const char RELPATH[] = "some_file.txt";
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uint64_t ino = 42;
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mode_t access_mode = R_OK;
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expect_access(1, X_OK, 0);
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expect_lookup(RELPATH, ino);
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expect_access(ino, access_mode, 0);
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@ -162,6 +162,9 @@ void debug_fuseop(const mockfs_buf_in *in)
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switch (in->header.opcode) {
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const char *name, *value;
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case FUSE_ACCESS:
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printf(" mask=%#x", in->body.access.mask);
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break;
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case FUSE_CREATE:
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name = (const char*)in->body.bytes +
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sizeof(fuse_open_in);
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@ -96,6 +96,21 @@ void FuseTest::SetUp() {
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m_mock = new MockFS(m_maxreadahead, m_allow_other,
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m_default_permissions, m_push_symlinks_in, m_ro,
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m_init_flags);
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/*
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* FUSE_ACCESS is called almost universally. Expecting it in
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* each test case would be super-annoying. Instead, set a
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* default expectation for FUSE_ACCESS and return ENOSYS.
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*
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* Individual test cases can override this expectation since
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* googlemock evaluates expectations in LIFO order.
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*/
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EXPECT_CALL(*m_mock, process(
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ResultOf([=](auto in) {
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return (in->header.opcode == FUSE_ACCESS);
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}, Eq(true)),
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_)
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).Times(AnyNumber())
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.WillRepeatedly(Invoke(ReturnErrno(ENOSYS)));
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} catch (std::system_error err) {
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FAIL() << err.what();
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}
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