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Paul Jackson 2efe86b809 [PATCH] cpuset exit NULL dereference fix ... There is a race in the kernel cpuset code, between the code to handle notify_on_release, and the code to remove a cpuset. The notify_on_release code can end up trying to access a cpuset that has been removed. In the most common case, this causes a NULL pointer dereference from the routine cpuset_path. However all manner of bad things are possible, in theory at least. The existing code decrements the cpuset use count, and if the count goes to zero, processes the notify_on_release request, if appropriate. However, once the count goes to zero, unless we are holding the global cpuset_sem semaphore, there is nothing to stop another task from immediately removing the cpuset entirely, and recycling its memory. The obvious fix would be to always hold the cpuset_sem semaphore while decrementing the use count and dealing with notify_on_release. However we don't want to force a global semaphore into the mainline task exit path, as that might create a scaling problem. The actual fix is almost as easy - since this is only an issue for cpusets using notify_on_release, which the top level big cpusets don't normally need to use, only take the cpuset_sem for cpusets using notify_on_release. This code has been run for hours without a hiccup, while running a cpuset create/destroy stress test that could crash the existing kernel in seconds. This patch applies to the current -linus git kernel. Signed-off-by: Paul Jackson <pj@sgi.com> Acked-by: Simon Derr <simon.derr@bull.net> Acked-by: Dinakar Guniguntala <dino@in.ibm.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		20 years ago
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irq	[PATCH] spurious interrupt fix	20 years ago
power	[PATCH] Driver Core: pm diagnostics update, check for errors	20 years ago
Makefile	[PATCH] ppc64: remove hidden -fno-omit-frame-pointer for schedule.c	20 years ago
acct.c	Linux-2.6.12-rc2	20 years ago
audit.c	Merge with master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6.git	20 years ago
auditsc.c	[AUDIT] LOGIN message credentials	20 years ago
capability.c	Linux-2.6.12-rc2	20 years ago
compat.c	[PATCH] Fix get_compat_sigevent()	20 years ago
configs.c	Linux-2.6.12-rc2	20 years ago
cpu.c	Linux-2.6.12-rc2	20 years ago
cpuset.c	[PATCH] cpuset exit NULL dereference fix	20 years ago
dma.c	Linux-2.6.12-rc2	20 years ago
exec_domain.c	Linux-2.6.12-rc2	20 years ago
exit.c	[patch] MCA recovery module undefined symbol fix	20 years ago
extable.c	Linux-2.6.12-rc2	20 years ago
fork.c	Linux-2.6.12-rc2	20 years ago
futex.c	[PATCH] convert that currently tests _NSIG directly to use valid_signal()	20 years ago
intermodule.c	Linux-2.6.12-rc2	20 years ago
itimer.c	[PATCH] setitimer timer expires too early	20 years ago
kallsyms.c	[PATCH] ppc32: platform-specific functions missing from kallsyms.	20 years ago
kfifo.c	Linux-2.6.12-rc2	20 years ago
kmod.c	Linux-2.6.12-rc2	20 years ago
kprobes.c	[PATCH] kprobes: Allow multiple kprobes at the same address	20 years ago
ksysfs.c	Linux-2.6.12-rc2	20 years ago
kthread.c	[PATCH] use smp_mb/wmb/rmb where possible	20 years ago
module.c	[PATCH] Change synchronize_kernel to _rcu and _sched	20 years ago
panic.c	[SPARC]: Stop-A printk cleanup	20 years ago
params.c	[PATCH] kernel/param.c: don't use .max when .num is NULL in param_array_set()	20 years ago
pid.c	Linux-2.6.12-rc2	20 years ago
posix-cpu-timers.c	Linux-2.6.12-rc2	20 years ago
posix-timers.c	Linux-2.6.12-rc2	20 years ago
printk.c	[PATCH] add_preferred_console() build fix	20 years ago
profile.c	[PATCH] profile.c: `schedule' parsing fix	20 years ago
ptrace.c	[PATCH] convert that currently tests _NSIG directly to use valid_signal()	20 years ago
rcupdate.c	[PATCH] Deprecate synchronize_kernel, GPL replacement	20 years ago
resource.c	[PATCH] pci enumeration on ixp2000: overflow in kernel/resource.c	20 years ago
sched.c	[PATCH] cpusets+hotplug+preepmt broken	20 years ago
seccomp.c	Linux-2.6.12-rc2	20 years ago
signal.c	[PATCH] sigkill priority fix	20 years ago
softirq.c	Linux-2.6.12-rc2	20 years ago
spinlock.c	[PATCH] spin_unlock_bh() and preempt_check_resched()	20 years ago
stop_machine.c	[PATCH] use smp_mb/wmb/rmb where possible	20 years ago
sys.c	[PATCH] correctly name the Shell sort	20 years ago
sys_ni.c	[PATCH] consolidate sys_shmat	20 years ago
sysctl.c	[PATCH] DocBook: fix some descriptions	20 years ago
time.c	[PATCH] time interpolator: Fix settimeofday inaccuracy	20 years ago
timer.c	[PATCH] use smp_mb/wmb/rmb where possible	20 years ago
uid16.c	Linux-2.6.12-rc2	20 years ago
user.c	Linux-2.6.12-rc2	20 years ago
wait.c	Linux-2.6.12-rc2	20 years ago
workqueue.c	[PATCH] re-export cancel_rearming_delayed_workqueue	20 years ago