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Linus Torvalds f358166a94 ptrace_attach: fix possible deadlock schenario with irqs 
Eric Biederman points out that we can't take the task_lock while holding
tasklist_lock for writing, because another CPU that holds the task lock
might take an interrupt that then tries to take tasklist_lock for writing.

Which would be a nasty deadlock, with one CPU spinning forever in an
interrupt handler (although admittedly you need to really work at
triggering it ;)

Since the ptrace_attach() code is special and very unusual, just make it
be extra careful, and use trylock+repeat to avoid the possible deadlock.

Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-05-11 11:08:49 -07:00
..
irq
[PATCH] request_irq(): remove warnings from irq probing
2006-04-28 08:33:46 -07:00
power
[PATCH] off-by-1 in kernel/power/main.c
2006-04-28 08:33:46 -07:00
.gitignore
gitignore: ignore more generated files
2006-01-03 11:35:26 +01:00
acct.c
[PATCH] Fix pacct bug in multithreading case.
2006-03-31 12:18:54 -08:00
audit.c
[PATCH] More user space subject labels
2006-05-01 06:10:01 -04:00
audit.h
[PATCH] support for context based audit filtering, part 2
2006-05-01 06:09:36 -04:00
auditfilter.c
[PATCH] More user space subject labels
2006-05-01 06:10:01 -04:00
auditsc.c
[PATCH] Audit Filter Performance
2006-05-01 06:10:07 -04:00
capability.c
[PATCH] refactor capable() to one implementation, add __capable() helper
2006-03-25 08:22:56 -08:00
compat.c
[PATCH] lightweight robust futexes: compat
2006-03-27 08:44:49 -08:00
configs.c
update the email address of Randy Dunlap
2006-01-03 13:37:51 +01:00
cpu.c
[PATCH] Notifier chain update: API changes
2006-03-27 08:44:50 -08:00
cpuset.c
[PATCH] cpuset: memory migration interaction fix
2006-03-31 12:18:55 -08:00
dma.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
exec_domain.c
[PATCH] Fix module refcount leak in __set_personality()
2006-03-24 07:33:30 -08:00
exit.c
[PATCH] move call of audit_free() into do_exit()
2006-05-01 06:06:13 -04:00
extable.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
fork.c
[PATCH] move call of audit_free() into do_exit()
2006-05-01 06:06:13 -04:00
futex_compat.c
[PATCH] futex: check and validate timevals
2006-03-31 12:18:59 -08:00
futex.c
[PATCH] futex: check and validate timevals
2006-03-31 12:18:59 -08:00
hrtimer.c
[PATCH] Remove __devinit and __cpuinit from notifier_call definitions
2006-04-26 08:30:03 -07:00
intermodule.c
[PATCH] missing license tag in intermodule
2006-02-05 11:06:52 -08:00
itimer.c
[PATCH] hrtimers: remove data field
2006-03-26 08:57:03 -08:00
kallsyms.c
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
Kconfig.hz
[PATCH] i386: Selectable Frequency of the Timer Interrupt
2005-06-23 09:45:10 -07:00
Kconfig.preempt
[PATCH] sched: voluntary kernel preemption
2005-06-25 16:24:45 -07:00
kexec.c
[PATCH] move capable() to capability.h
2006-01-11 18:42:13 -08:00
kfifo.c
[PATCH] gfp flags annotations - part 1
2005-10-08 15:00:57 -07:00
kmod.c
[PATCH] wait_for_helper: trivial style cleanup
2006-03-28 18:36:41 -08:00
kprobes.c
[PATCH] kprobes: NULL out non-relevant fields in struct kretprobe
2006-04-20 07:54:03 -07:00
ksysfs.c
[PATCH] fix build error if CONFIG_SYSFS=n
2006-03-24 07:33:31 -08:00
kthread.c
[PATCH] find_task_by_pid() needs tasklist_lock
2006-03-25 08:22:57 -08:00
Makefile
[PATCH] lightweight robust futexes: compat
2006-03-27 08:44:49 -08:00
module.c
[PATCH] modules: permit Dual-MIT/GPL licenses
2006-03-31 12:18:56 -08:00
mutex-debug.c
[PATCH] fix/simplify mutex debugging code
2006-01-11 08:14:16 -08:00
mutex-debug.h
[PATCH] mutex subsystem, debugging code
2006-01-09 15:59:20 -08:00
mutex.c
[PATCH] mutex: trivial whitespace cleanups
2006-01-10 14:27:59 -08:00
mutex.h
[PATCH] mutex subsystem, core
2006-01-09 15:59:19 -08:00
panic.c
[PATCH] the scheduled unexport of panic_timeout
2006-04-11 06:18:40 -07:00
params.c
[PATCH] Change dash2underscore() return value to char
2006-03-28 09:16:03 -08:00
pid.c
[PATCH] pidhash: Refactor the pid hash table
2006-03-31 12:19:00 -08:00
posix-cpu-timers.c
[PATCH] hrtimer: switch clock_nanosleep to hrtimer nanosleep API
2006-01-10 08:01:38 -08:00
posix-timers.c
[PATCH] hrtimers: remove data field
2006-03-26 08:57:03 -08:00
printk.c
BUG_ON() Conversion in kernel/printk.c
2006-04-01 01:21:17 +02:00
profile.c
[PATCH] Remove __devinit and __cpuinit from notifier_call definitions
2006-04-26 08:30:03 -07:00
ptrace.c
ptrace_attach: fix possible deadlock schenario with irqs
2006-05-11 11:08:49 -07:00
rcupdate.c
[PATCH] Remove __devinit and __cpuinit from notifier_call definitions
2006-04-26 08:30:03 -07:00
rcutorture.c
[PATCH] for_each_possible_cpu: fixes for generic part
2006-03-28 09:16:05 -08:00
relay.c
[PATCH] relay: consolidate sendfile() and read() code
2006-03-23 19:58:45 +01:00
resource.c
[PATCH] kernel/resource.c: __check_region(): remove pointless __deprecated
2006-01-10 08:02:02 -08:00
sched.c
[PATCH] Remove __devinitdata from notifier block definitions
2006-04-26 08:27:50 -07:00
seccomp.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
signal.c
[PATCH] fix non-leader exec under ptrace
2006-04-14 08:59:13 -07:00
softirq.c
[PATCH] Remove __devinit and __cpuinit from notifier_call definitions
2006-04-26 08:30:03 -07:00
softlockup.c
[PATCH] Remove __devinit and __cpuinit from notifier_call definitions
2006-04-26 08:30:03 -07:00
spinlock.c
[PATCH] BUILD_LOCK_OPS: cleanup preempt_disable() usage
2006-03-23 07:38:16 -08:00
stop_machine.c
[PATCH] Remove set_fs() in stop_machine()
2006-01-10 08:01:25 -08:00
sys_ni.c
[PATCH] frv: define MMU mode specific syscalls as 'cond_syscall' and clean up unneeded macros
2006-04-11 06:18:33 -07:00
sys.c
[PATCH] Make setsid() more robust
2006-03-31 12:18:59 -08:00
sysctl.c
[PATCH] Range checking in do_proc_dointvec_(userhz_)jiffies_conv
2006-03-24 07:33:20 -08:00
time.c
Fix comments: s/granuality/granularity/
2006-04-01 01:41:22 +02:00
timer.c
[PATCH] Remove __devinit and __cpuinit from notifier_call definitions
2006-04-26 08:30:03 -07:00
uid16.c
[PATCH] Add more prevent_tail_call()
2006-04-19 16:27:18 -07:00
user.c
[PATCH] free_uid() locking improvement
2006-03-24 07:33:20 -08:00
wait.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
workqueue.c
[PATCH] Remove __devinit and __cpuinit from notifier_call definitions
2006-04-26 08:30:03 -07:00