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del_timer_sync() is often called before the object that owns the timer is
freed. But sometimes there's a race that enables the timer again before it is
freed and causes a use after free when that timer triggers. This patch set
adds a new "shutdown" timer state, which is set on the new timer_shutdown()
API. Once a timer is in this state, it can not be re-armed and if it is, it
will warn.
The first three patches change existing timer_shutdown() functions used
locally in ARM and some drivers to better namespace names.
The fourth patch implements the new API.
The fifth patch is now a treewide patch that uses a coccinelle script to
convert the trivial locations where a del_timer*() is called on a timer of an
object that is freed immediately afterward (or at least in the same function).
Changes since v5a:
https://lore.kernel.org/all/20221106054535.709068702@xxxxxxxxxxx/
- Updated the script to make ptr and slab into expressions instead of
using identifiers (Julia Lawall and Linus Torvalds)
Steven Rostedt (Google) (5):
ARM: spear: Do not use timer namespace for timer_shutdown() function
clocksource/drivers/arm_arch_timer: Do not use timer namespace for
timer_shutdown() function
clocksource/drivers/sp804: Do not use timer namespace for
timer_shutdown() function
timers: Add timer_shutdown_sync() and timer_shutdown() to be called
before freeing timers
treewide: Convert del_timer*() to timer_shutdown*()
----
.../RCU/Design/Requirements/Requirements.rst | 2 +-
Documentation/core-api/local_ops.rst | 2 +-
Documentation/kernel-hacking/locking.rst | 5 ++
arch/arm/mach-spear/time.c | 8 +--
arch/sh/drivers/push-switch.c | 2 +-
block/blk-iocost.c | 2 +-
block/blk-iolatency.c | 2 +-
block/kyber-iosched.c | 2 +-
drivers/acpi/apei/ghes.c | 2 +-
drivers/atm/idt77252.c | 6 +-
drivers/block/drbd/drbd_main.c | 2 +-
drivers/block/loop.c | 2 +-
drivers/bluetooth/hci_bcsp.c | 2 +-
drivers/bluetooth/hci_qca.c | 4 +-
drivers/clocksource/arm_arch_timer.c | 12 ++--
drivers/clocksource/timer-sp804.c | 6 +-
drivers/gpu/drm/i915/i915_sw_fence.c | 2 +-
drivers/hid/hid-wiimote-core.c | 2 +-
drivers/input/keyboard/locomokbd.c | 2 +-
drivers/input/keyboard/omap-keypad.c | 2 +-
drivers/input/mouse/alps.c | 2 +-
drivers/isdn/mISDN/l1oip_core.c | 4 +-
drivers/isdn/mISDN/timerdev.c | 4 +-
drivers/leds/trigger/ledtrig-activity.c | 2 +-
drivers/leds/trigger/ledtrig-heartbeat.c | 2 +-
drivers/leds/trigger/ledtrig-pattern.c | 2 +-
drivers/leds/trigger/ledtrig-transient.c | 2 +-
drivers/media/pci/ivtv/ivtv-driver.c | 2 +-
drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 16 +++---
drivers/media/usb/s2255/s2255drv.c | 4 +-
drivers/net/ethernet/intel/i40e/i40e_main.c | 6 +-
drivers/net/ethernet/marvell/sky2.c | 2 +-
drivers/net/ethernet/sun/sunvnet.c | 2 +-
drivers/net/usb/sierra_net.c | 2 +-
.../wireless/broadcom/brcm80211/brcmfmac/btcoex.c | 2 +-
drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 2 +-
drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 2 +-
drivers/net/wireless/intersil/hostap/hostap_ap.c | 2 +-
drivers/net/wireless/marvell/mwifiex/main.c | 2 +-
drivers/net/wireless/microchip/wilc1000/hif.c | 6 +-
drivers/nfc/pn533/pn533.c | 2 +-
drivers/nfc/pn533/uart.c | 2 +-
drivers/pcmcia/bcm63xx_pcmcia.c | 2 +-
drivers/pcmcia/electra_cf.c | 2 +-
drivers/pcmcia/omap_cf.c | 2 +-
drivers/pcmcia/pd6729.c | 4 +-
drivers/pcmcia/yenta_socket.c | 4 +-
drivers/scsi/qla2xxx/qla_edif.c | 4 +-
drivers/staging/media/atomisp/i2c/atomisp-lm3554.c | 2 +-
drivers/tty/n_gsm.c | 2 +-
drivers/tty/sysrq.c | 2 +-
drivers/usb/gadget/udc/m66592-udc.c | 2 +-
drivers/usb/serial/garmin_gps.c | 2 +-
drivers/usb/serial/mos7840.c | 4 +-
fs/ext4/super.c | 2 +-
fs/nilfs2/segment.c | 2 +-
include/linux/timer.h | 62 +++++++++++++++++++--
kernel/time/timer.c | 64 ++++++++++++----------
net/802/garp.c | 2 +-
net/802/mrp.c | 4 +-
net/bridge/br_multicast.c | 8 +--
net/bridge/br_multicast_eht.c | 4 +-
net/core/gen_estimator.c | 2 +-
net/ipv4/ipmr.c | 2 +-
net/ipv6/ip6mr.c | 2 +-
net/mac80211/mesh_pathtbl.c | 2 +-
net/netfilter/ipset/ip_set_list_set.c | 2 +-
net/netfilter/ipvs/ip_vs_lblc.c | 2 +-
net/netfilter/ipvs/ip_vs_lblcr.c | 2 +-
net/netfilter/xt_IDLETIMER.c | 4 +-
net/netfilter/xt_LED.c | 2 +-
net/rxrpc/conn_object.c | 2 +-
net/sched/cls_flow.c | 2 +-
net/sunrpc/svc.c | 2 +-
net/tipc/discover.c | 2 +-
net/tipc/monitor.c | 2 +-
sound/i2c/other/ak4117.c | 2 +-
sound/synth/emux/emux.c | 2 +-
78 files changed, 207 insertions(+), 148 deletions(-)
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