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e041c68341
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/*
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* Definitions for ADB (Apple Desktop Bus) support.
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*/
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#ifndef __ADB_H
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#define __ADB_H
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/* ADB commands */
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#define ADB_BUSRESET 0
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#define ADB_FLUSH(id) (0x01 | ((id) << 4))
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#define ADB_WRITEREG(id, reg) (0x08 | (reg) | ((id) << 4))
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#define ADB_READREG(id, reg) (0x0C | (reg) | ((id) << 4))
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/* ADB default device IDs (upper 4 bits of ADB command byte) */
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#define ADB_DONGLE 1 /* "software execution control" devices */
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#define ADB_KEYBOARD 2
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#define ADB_MOUSE 3
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#define ADB_TABLET 4
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#define ADB_MODEM 5
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#define ADB_MISC 7 /* maybe a monitor */
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#define ADB_RET_OK 0
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#define ADB_RET_TIMEOUT 3
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/* The kind of ADB request. The controller may emulate some
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or all of those CUDA/PMU packet kinds */
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#define ADB_PACKET 0
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#define CUDA_PACKET 1
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#define ERROR_PACKET 2
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#define TIMER_PACKET 3
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#define POWER_PACKET 4
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#define MACIIC_PACKET 5
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#define PMU_PACKET 6
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#define ADB_QUERY 7
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/* ADB queries */
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/* ADB_QUERY_GETDEVINFO
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* Query ADB slot for device presence
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* data[2] = id, rep[0] = orig addr, rep[1] = handler_id
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*/
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#define ADB_QUERY_GETDEVINFO 1
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#ifdef __KERNEL__
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struct adb_request {
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unsigned char data[32];
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int nbytes;
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unsigned char reply[32];
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int reply_len;
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unsigned char reply_expected;
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unsigned char sent;
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unsigned char complete;
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void (*done)(struct adb_request *);
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void *arg;
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struct adb_request *next;
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};
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struct adb_ids {
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int nids;
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unsigned char id[16];
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};
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/* Structure which encapsulates a low-level ADB driver */
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struct adb_driver {
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char name[16];
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int (*probe)(void);
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int (*init)(void);
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int (*send_request)(struct adb_request *req, int sync);
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int (*autopoll)(int devs);
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void (*poll)(void);
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int (*reset_bus)(void);
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};
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/* Values for adb_request flags */
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#define ADBREQ_REPLY 1 /* expect reply */
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#define ADBREQ_SYNC 2 /* poll until done */
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#define ADBREQ_NOSEND 4 /* build the request, but don't send it */
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/* Messages sent thru the client_list notifier. You should NOT stop
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the operation, at least not with this version */
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enum adb_message {
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ADB_MSG_POWERDOWN, /* Currently called before sleep only */
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ADB_MSG_PRE_RESET, /* Called before resetting the bus */
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ADB_MSG_POST_RESET /* Called after resetting the bus (re-do init & register) */
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};
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extern struct adb_driver *adb_controller;
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extern struct blocking_notifier_head adb_client_list;
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int adb_request(struct adb_request *req, void (*done)(struct adb_request *),
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int flags, int nbytes, ...);
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int adb_register(int default_id,int handler_id,struct adb_ids *ids,
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void (*handler)(unsigned char *, int, struct pt_regs *, int));
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int adb_unregister(int index);
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void adb_poll(void);
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void adb_input(unsigned char *, int, struct pt_regs *, int);
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int adb_reset_bus(void);
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int adb_try_handler_change(int address, int new_id);
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int adb_get_infos(int address, int *original_address, int *handler_id);
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#endif /* __KERNEL__ */
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#endif /* __ADB_H */
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