Dan Streetman
b51d23e4e9
module: add per-module param_lock ...
Add a "param_lock" mutex to each module, and update params.c to use
the correct built-in or module mutex while locking kernel params.
Remove the kparam_block_sysfs_r/w() macros, replace them with direct
calls to kernel_param_[un]lock(module).
The kernel param code currently uses a single mutex to protect
modification of any and all kernel params. While this generally works,
there is one specific problem with it; a module callback function
cannot safely load another module, i.e. with request_module() or even
with indirect calls such as crypto_has_alg(). If the module to be
loaded has any of its params configured (e.g. with a /etc/modprobe.d/*
config file), then the attempt will result in a deadlock between the
first module param callback waiting for modprobe, and modprobe trying to
lock the single kernel param mutex to set the new module's param.
This fixes that by using per-module mutexes, so that each individual module
is protected against concurrent changes in its own kernel params, but is
not blocked by changes to other module params. All built-in modules
continue to use the built-in mutex, since they will always be loaded at
runtime and references (e.g. request_module(), crypto_has_alg()) to them
will never cause load-time param changing.
This also simplifies the interface used by modules to block sysfs access
to their params; while there are currently functions to block and unblock
sysfs param access which are split up by read and write and expect a single
kernel param to be passed, their actual operation is identical and applies
to all params, not just the one passed to them; they simply lock and unlock
the global param mutex. They are replaced with direct calls to
kernel_param_[un]lock(THIS_MODULE), which locks THIS_MODULE's param_lock, or
if the module is built-in, it locks the built-in mutex.
Suggested-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2015-06-23 15:27:38 +09:30
bpf: fix 64-bit divide
2015-04-27 23:11:49 -04:00
x86: Add "make tinyconfig" to configure the tiniest possible kernel
2014-08-08 16:30:24 -07:00
debug: prevent entering debug mode on panic/exception.
2015-02-19 12:39:03 -06:00
perf: Annotate inherited event ctx->mutex recursion
2015-05-08 11:59:40 +02:00
gcov: fix softlockups
2015-04-17 09:04:08 -04:00
genirq: Set IRQCHIP_SKIP_SET_WAKE flag for dummy_irq_chip
2015-04-24 20:57:06 +02:00
Merge branch 'for-4.1/core-noarch' into for-linus
2015-04-13 23:57:20 +02:00
sched: Handle priority boosted tasks proper in setscheduler()
2015-05-08 11:53:55 +02:00
Merge back earlier suspend/hibernate material for v4.1.
2015-04-10 12:01:59 +02:00
TTY/Serial patches for 4.1-rc1
2015-04-21 09:33:10 -07:00
rcu: Control grace-period delays directly from value
2015-04-14 19:33:59 -07:00
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
2015-05-22 15:15:30 -07:00
seqlock: Introduce raw_read_seqcount_latch()
2015-05-28 11:32:06 +09:30
tracing: Make ftrace_print_array_seq compute buf_len
2015-05-06 23:03:23 -04:00
acct: check FMODE_CAN_WRITE
2015-04-11 22:27:55 -04:00
kernel/async.c: switch to pr_foo()
2014-10-09 22:26:04 -04:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2015-04-26 17:22:07 -07:00
Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit
2015-04-22 14:49:23 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2015-04-26 17:22:07 -07:00
VFS: audit: d_backing_inode() annotations
2015-04-15 15:06:55 -04:00
Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit
2015-02-11 20:07:47 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2015-04-26 17:22:07 -07:00
page-cgroup: get rid of NR_PCG_FLAGS
2014-08-08 15:57:18 -07:00
kernel: conditionally support non-root users, groups and capabilities
2015-04-15 16:35:22 -07:00
cgroup: remove use of seq_printf return value
2015-04-15 16:35:25 -07:00
cgroup: rename cgroup_subsys->base_cftypes to ->legacy_cftypes
2014-07-15 11:05:09 -04:00
all arches, signal: move restart_block to struct task_struct
2015-02-12 18:54:12 -08:00
context_tracking: Export context_tracking_user_enter/exit
2015-03-09 15:43:00 +01:00
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-04-14 13:36:04 -07:00
kernel, cpuset: remove exception for __GFP_THISNODE
2015-04-14 16:49:03 -07:00
crash_dump: Make is_kdump_kernel() accessible from modules
2014-08-25 15:42:19 -07:00
kernel: conditionally support non-root users, groups and capabilities
2015-04-15 16:35:22 -07:00
delayacct: Remove braindamaged type conversions
2014-07-23 10:18:06 -07:00
Remove rest of exec domains.
2015-04-12 21:03:31 +02:00
Remove execution domain support
2015-04-12 20:58:24 +02:00
ftrace/x86/extable: Add is_ftrace_trampoline() function
2014-11-19 15:25:26 -05:00
oprofile: reduce mmap_sem hold for mm->exe_file
2015-04-17 09:04:11 -04:00
freezer: remove obsolete comments in __thaw_task()
2014-10-21 23:44:20 +02:00
Linux 34.0-rc1
2015-02-24 08:41:07 +01:00
kernel: conditionally support non-root users, groups and capabilities
2015-04-15 16:35:22 -07:00
kernel/hung_task.c: change hung_task.c to use for_each_process_thread()
2015-04-15 16:35:22 -07:00
percpu: Convert remaining __get_cpu_var uses in 3.18-rcX
2014-10-29 11:18:18 -04:00
module, jump_label: Fix module locking
2015-05-27 11:09:50 +09:30
kernel/kallsyms.c: use __seq_open_private()
2014-10-14 02:18:16 +02:00
kcmp: fix standard comparison bug
2014-09-10 15:42:12 -07:00
locking/mcs: Better differentiate between MCS variants
2015-01-14 15:07:32 +01:00
kexec: allocate the kexec control page with KEXEC_CONTROL_MEMORY_GFP
2015-04-23 16:52:01 +02:00
usermodehelper: kill the kmod_thread_locker logic
2014-12-10 17:41:17 -08:00
kprobes: makes kprobes/enabled works correctly for optimized kprobes.
2015-02-13 21:21:42 -08:00
kernel/kthread.c: partial revert of 81c98869fa ("kthread: ensure locality of task_struct allocations")
2014-10-09 22:25:51 -04:00
modsign: change default key details
2015-04-30 09:35:41 -07:00
module: add per-module param_lock
2015-06-23 15:27:38 +09:30
rcu: Make SRCU optional by using CONFIG_SRCU
2015-01-06 11:04:29 -08:00
bury struct proc_ns in fs/proc
2014-12-04 14:34:54 -05:00
padata: use %*pb[l] to print bitmaps including cpumasks and nodemasks
2015-02-13 21:21:38 -08:00
livepatch: kernel: add TAINT_LIVEPATCH
2014-12-22 15:40:48 +01:00
module: add per-module param_lock
2015-06-23 15:27:38 +09:30
fork: report pid reservation failure properly
2015-04-17 09:04:06 -04:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-12-16 15:53:03 -08:00
profile: use %*pb[l] to print bitmaps including cpumasks and nodemasks
2015-02-13 21:21:38 -08:00
ptrace: ptrace_detach() can no longer race with SIGKILL
2015-04-17 09:04:06 -04:00
kernel: avoid overflow in cmp_range
2015-01-17 10:02:23 +13:00
kernel/reboot.c: add orderly_reboot for graceful reboot
2015-04-15 16:35:23 -07:00
VFS: kernel/: d_inode() annotations
2015-04-15 15:06:55 -04:00
kernel/resource.c: remove deprecated __check_region() and friends
2015-04-15 16:35:22 -07:00
seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO
2015-02-17 14:34:55 -08:00
signal: remove warning about using SI_TKILL in rt_[tg]sigqueueinfo
2015-04-17 09:04:06 -04:00
smp: Fix error case handling in smp_call_function_*()
2015-04-19 13:19:23 -07:00
smpboot: Add common code for notification from dying CPU
2015-03-11 13:20:25 -07:00
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-02-09 15:24:03 -08:00
stacktrace: introduce snprint_stack_trace for buffer output
2014-12-13 12:42:48 -08:00
prctl: avoid using mmap_sem for exe_file serialization
2015-04-17 09:04:07 -04:00
kernel: conditionally support non-root users, groups and capabilities
2015-04-15 16:35:22 -07:00
kernel/sysctl.c: detect overflows when converting to int
2015-04-17 09:04:08 -04:00
kernel: add panic_on_warn
2014-12-10 17:41:10 -08:00
KEYS: validate certificate trust only with builtin keys
2014-07-17 09:35:17 -04:00
netlink: make nlmsg_end() and genlmsg_end() void
2015-01-18 01:03:45 -05:00
kernel/test_kprobes.c: use current logging functions
2014-08-08 15:57:18 -07:00
torture: Address race in module cleanup
2014-09-16 13:41:06 -07:00
sched: Make task->start_time nanoseconds based
2014-07-23 10:18:05 -07:00
groups: Consolidate the setgroups permission checks
2014-12-05 17:19:27 -06:00
scheduler: Replace __get_cpu_var with this_cpu_ptr
2014-08-26 13:45:45 -04:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2014-12-17 12:31:40 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2014-12-17 12:31:40 -08:00
copy address of proc_ns_ops into ns_common
2014-12-04 14:34:47 -05:00
watchdog: fix double lock in watchdog_nmi_enable_all
2015-05-19 10:57:03 -07:00
kernel/workqueue.c: remove ifdefs over wq_power_efficient
2015-05-28 11:32:12 +09:30
b51d23e4e9