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mount_setattr(2) was the only new-mount-API sibling not exercised
end-to-end (unlike move_mount/fsmount/fspick/open_tree), and vmsplice(2)
had zero end-to-end assertion despite being TRANSFER_CLASSIFIED.
uj0 (mount_setattr): add a best-effort RawSyscall6(SYS_MOUNT_SETATTR)
call to mountfsManagement() aimed at the scenario mount point with
AT_FDCWD and a MountAttr requesting MOUNT_ATTR_RDONLY. It needs
CAP_SYS_ADMIN (Linux 5.12+) and the path is not a mount, so it returns
EPERM/EINVAL, but its sys_enter_ tracepoint fires on kernel entry before
any check -- the same best-effort pattern used for the other mount-API
calls. Add mount_setattr to mountfsTraceArgs and assert
enter_mount_setattr MinCount>=1 in TestMountFsManagementSyscalls.
bl0 (vmsplice): add a deterministic retbytesVmsplice driver to the
phase-A workload (mirroring the getdents64/readlinkat drivers): a spaced
retry loop that gathers a fixed 18-byte user iovec into a fresh pipe via
vmsplice and drains it each iteration. vmsplice is TRANSFER_CLASSIFIED,
so the exit reports ctx->ret = bytes moved. Add vmsplice to
retbytesTraceArgs and assert enter_vmsplice presence plus
assertEventBytesAtLeast(payloadLen=18) and a positive duration in
TestRetbytesPhaseA, locking in the TRANSFER byte attribution like its
splice/tee siblings.
Coverage hardening only; classification/tracing verified correct by
inspection (mount_setattr=FamilyFS/KindPathname/UNCLASSIFIED,
vmsplice=FamilyNetwork/KindFd/TRANSFER_CLASSIFIED).
Verified: TEST_NAME=TestMountFsManagementSyscalls mage testWithName PASS
(enter_mount_setattr captured); TEST_NAME=TestRetbytesPhaseA mage
testWithName PASS (vmsplice bytes>=18 asserted).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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ioctl (FamilyFS, KindFd@arg0) previously only fired implicitly via the Go
runtime/terminal. Add scenario_ioctl.go issuing a benign FIONREAD ioctl on
an opened temp file (registered as ioctl-basic) and ioctl_test.go asserting
enter_ioctl resolves to the temp file path, mirroring the fcntl suite.
quotactl_fd (FamilyFS, KindFd@arg0) had no coverage while its sibling
quotactl was tested in mountfs. Add a best-effort RawSyscall6 SYS_QUOTACTL_FD
call on an fd opened on the mount point in scenario_mountfs.go, extend
mountfsTraceArgs, and assert enter_quotactl_fd (MinCount>=1). The sys_enter
tracepoint fires on kernel entry regardless of privilege/quota support.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Extend the mountfs-management scenario with best-effort fsconfig (KindFd),
fspick (KindPathname), and open_tree (KindOpen) calls to complete
new-mount-API end-to-end coverage. fsconfig reuses the fscontext fd from
fsopen (FSCONFIG_SET_STRING + FSCONFIG_CMD_CREATE), fspick targets "/"
with FSPICK_NO_AUTOMOUNT, and open_tree clones the scenario mount point
with OPEN_TREE_CLONE|OPEN_TREE_CLOEXEC. All returned fds are closed and
all errno values are ignored, so ENOSYS/EPERM/EINVAL/EBADF are tolerated;
the sys_enter_ tracepoints fire on kernel entry regardless, creating no
mounts on the host.
Assert enter_fsconfig/enter_fspick/enter_open_tree (MinCount>=1) in
TestMountFsManagementSyscalls and add the three syscalls to the trace
filter. Gating is unchanged (root-only via the shared harness).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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The mountfs-management integration scenario covered the new mount API
syscalls fsmount/move_mount/mount/umount/pivot_root but not fsopen, the
API's entry point and a direct eventfd-kind sibling of fsmount. Add a
best-effort fsopen("tmpfs", FSOPEN_CLOEXEC) call (closing the returned
context fd on success) and assert enter_fsopen is traced.
fsopen's tracing is otherwise correct: args[1] flags captured, args[0]
fsname (a filesystem TYPE, not a path) deliberately not treated as a
pathname, returned fd registered as the 'fsopenfd:<flags>' descriptor.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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