[PATCH 00/11] Convert moduleparams to seq_buf
Kees Cook
kees at kernel.org
Thu May 21 06:33:13 PDT 2026
Hi,
I tried to trim the CC list here, but it's still pretty huge...
We've had a long-standing issue with "write to a string pointer" callbacks
that don't bounds check the destination (and for which the bounds is
also not part of the callback prototype, even if it is "known" to be
PAGE_SIZE, which sysfs_emit() depends on). Both moduleparams and sysfs
use this pattern. As a first step, and to test the migration method,
migrate moduleparams first.
There are 2 "mechanical" treewide patches that are handled by Coccinelle:
- treewide: Convert struct kernel_param_ops initializers to DEFINE_KERNEL_PARAM_OPS
- treewide: Convert custom kernel_param_ops .get callbacks to seq_buf via cocci
The last treewide patch is manual, and may need to be broken up into
per-subsystem patches, though I'd prefer to avoid this, as it would
extend the migration from 1 relase to at least 2 releases. (1 to
release the migration infrastructure, then 1 release to collect all the
subsystem changes, and possibly 1 more release to remove the migration
infrastructure.)
Thoughts, questions?
-Kees
Kees Cook (10):
panic: Replace panic_print_get() with generic helper
moduleparam: Add DEFINE_KERNEL_PARAM_OPS macro family
treewide: Convert struct kernel_param_ops initializers to
DEFINE_KERNEL_PARAM_OPS
moduleparam: Rename .get field to .get_str
moduleparam: Add seq_buf-based .get callback alongside .get_str
moduleparam: Route DEFINE_KERNEL_PARAM_OPS get pointer via _Generic
params: Convert generic kernel_param_ops .get helpers to seq_buf
treewide: Convert custom kernel_param_ops .get callbacks to seq_buf
via cocci
treewide: Manually convert custom kernel_param_ops .get callbacks
moduleparam: Drop legacy kernel_param_ops .get_str field and dispatch
logic
Pengpeng Hou (1):
params: bound array element output to the caller's page buffer
include/linux/dynamic_debug.h | 8 +-
include/linux/moduleparam.h | 65 +++++++---
security/apparmor/include/lib.h | 3 +-
mm/kfence/core.c | 15 ++-
arch/powerpc/kvm/book3s_hv.c | 5 +-
arch/s390/kernel/perf_cpum_sf.c | 12 +-
arch/um/drivers/vfio_kern.c | 9 +-
arch/um/drivers/virtio_uml.c | 18 +--
arch/x86/kernel/msr.c | 11 +-
arch/x86/kvm/mmu/mmu.c | 28 ++--
arch/x86/kvm/svm/avic.c | 14 +-
arch/x86/kvm/vmx/vmx.c | 24 ++--
arch/x86/platform/uv/uv_nmi.c | 24 ++--
block/disk-events.c | 6 +-
drivers/acpi/button.c | 19 ++-
drivers/acpi/ec.c | 14 +-
drivers/acpi/sysfs.c | 114 ++++++++--------
drivers/block/loop.c | 12 +-
drivers/block/null_blk/main.c | 12 +-
drivers/block/rnbd/rnbd-srv.c | 6 +-
drivers/block/ublk_drv.c | 12 +-
drivers/char/ipmi/ipmi_msghandler.c | 12 +-
drivers/char/ipmi/ipmi_watchdog.c | 50 +++----
drivers/crypto/hisilicon/hpre/hpre_main.c | 16 +--
drivers/crypto/hisilicon/sec2/sec_main.c | 23 +---
drivers/crypto/hisilicon/zip/zip_crypto.c | 5 +-
drivers/crypto/hisilicon/zip/zip_main.c | 21 +--
drivers/dma/dmatest.c | 34 ++---
drivers/edac/i10nm_base.c | 6 +-
drivers/firmware/efi/efi-pstore.c | 6 +-
drivers/firmware/qcom/qcom_scm.c | 18 +--
drivers/firmware/qemu_fw_cfg.c | 40 +++---
drivers/gpu/drm/drm_panic.c | 13 +-
drivers/gpu/drm/i915/i915_mitigations.c | 31 ++---
drivers/gpu/drm/imagination/pvr_fw_trace.c | 6 +-
drivers/hid/hid-cougar.c | 6 +-
drivers/hid/hid-steam.c | 6 +-
drivers/infiniband/hw/hfi1/driver.c | 12 +-
drivers/infiniband/ulp/iser/iscsi_iser.c | 6 +-
drivers/infiniband/ulp/isert/ib_isert.c | 6 +-
drivers/infiniband/ulp/srp/ib_srp.c | 12 +-
drivers/infiniband/ulp/srpt/ib_srpt.c | 5 +-
drivers/input/misc/ati_remote2.c | 23 ++--
drivers/input/mouse/psmouse-base.c | 15 ++-
drivers/md/md.c | 5 +-
drivers/media/pci/tw686x/tw686x-core.c | 6 +-
drivers/media/usb/uvc/uvc_driver.c | 14 +-
drivers/misc/lis3lv02d/lis3lv02d.c | 5 +-
drivers/net/wireless/ath/wil6210/main.c | 10 +-
drivers/nvme/host/multipath.c | 17 +--
drivers/nvme/host/pci.c | 18 +--
drivers/nvme/target/rdma.c | 5 +-
drivers/nvme/target/tcp.c | 5 +-
drivers/pci/pcie/aspm.c | 17 ++-
drivers/platform/x86/acerhdf.c | 5 +-
drivers/power/supply/bq27xxx_battery.c | 6 +-
drivers/power/supply/test_power.c | 122 +++++++++---------
drivers/scsi/fcoe/fcoe_transport.c | 22 ++--
drivers/scsi/sg.c | 6 +-
drivers/target/target_core_user.c | 25 ++--
.../processor_thermal_soc_slider.c | 24 ++--
drivers/thermal/intel/intel_powerclamp.c | 34 ++---
drivers/tty/hvc/hvc_iucv.c | 24 ++--
drivers/tty/sysrq.c | 6 +-
drivers/ufs/core/ufs-fault-injection.c | 12 +-
drivers/ufs/core/ufs-mcq.c | 18 +--
drivers/ufs/core/ufs-txeq.c | 5 +-
drivers/ufs/core/ufshcd.c | 12 +-
drivers/usb/core/quirks.c | 6 +-
drivers/usb/gadget/legacy/serial.c | 5 +-
drivers/usb/storage/usb.c | 25 ++--
drivers/vhost/scsi.c | 12 +-
drivers/virt/nitro_enclaves/ne_misc_dev.c | 6 +-
drivers/virtio/virtio_mmio.c | 27 ++--
fs/ceph/super.c | 10 +-
fs/fuse/dir.c | 5 +-
fs/nfs/namespace.c | 12 +-
fs/nfs/super.c | 6 +-
fs/ocfs2/dlmfs/dlmfs.c | 5 +-
fs/overlayfs/copy_up.c | 5 +-
fs/ubifs/super.c | 6 +-
kernel/locking/locktorture.c | 12 +-
kernel/panic.c | 11 +-
kernel/params.c | 122 +++++++++---------
kernel/power/hibernate.c | 6 +-
kernel/rcu/tree.c | 24 ++--
kernel/sched/ext.c | 11 +-
kernel/workqueue.c | 18 ++-
lib/dynamic_debug.c | 16 ++-
lib/test_dynamic_debug.c | 12 +-
mm/damon/lru_sort.c | 33 +++--
mm/damon/reclaim.c | 33 +++--
mm/damon/stat.c | 16 +--
mm/memory_hotplug.c | 30 +++--
mm/page_reporting.c | 11 +-
mm/shuffle.c | 6 +-
mm/zswap.c | 14 +-
net/batman-adv/bat_algo.c | 6 +-
net/ceph/ceph_common.c | 10 +-
net/ipv4/tcp_dctcp.c | 6 +-
net/sunrpc/auth.c | 12 +-
net/sunrpc/svc.c | 5 +-
net/sunrpc/xprtsock.c | 18 +--
samples/damon/mtier.c | 6 +-
samples/damon/prcl.c | 6 +-
samples/damon/wsse.c | 6 +-
security/apparmor/lib.c | 27 ++--
security/apparmor/lsm.c | 75 +++++------
sound/hda/controllers/intel.c | 5 +-
sound/usb/card.c | 7 +-
110 files changed, 854 insertions(+), 1066 deletions(-)
--
2.34.1
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