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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
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Kconfig.hz
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Kconfig.preempt
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Makefile [PATCH] lightweight robust futexes: compat 2006-03-27 08:44:49 -08:00
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
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compat.c [PATCH] lightweight robust futexes: compat 2006-03-27 08:44:49 -08:00
configs.c
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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
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exec_domain.c
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exit.c [PATCH] move call of audit_free() into do_exit() 2006-05-01 06:06:13 -04:00
extable.c
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fork.c [PATCH] move call of audit_free() into do_exit() 2006-05-01 06:06:13 -04:00
futex.c [PATCH] futex: check and validate timevals 2006-03-31 12:18:59 -08:00
futex_compat.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
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itimer.c
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kallsyms.c
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kexec.c
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kfifo.c
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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
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kthread.c
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module.c [PATCH] modules: permit Dual-MIT/GPL licenses 2006-03-31 12:18:56 -08:00
mutex-debug.c
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mutex-debug.h
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mutex.c
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mutex.h
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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
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posix-timers.c
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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
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resource.c
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sched.c [PATCH] Remove __devinitdata from notifier block definitions 2006-04-26 08:27:50 -07:00
seccomp.c
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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
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stop_machine.c
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sys.c [PATCH] Make setsid() more robust 2006-03-31 12:18:59 -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
sysctl.c
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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
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wait.c
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workqueue.c [PATCH] Remove __devinit and __cpuinit from notifier_call definitions 2006-04-26 08:30:03 -07:00