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 <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Roland McGrath <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2006-05-11 11:08:49 -07:00

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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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acct.c

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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

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configs.c

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cpu.c

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cpuset.c

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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_compat.c

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futex.c

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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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Kconfig.hz

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Kconfig.preempt

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kexec.c

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kfifo.c

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kmod.c

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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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Makefile

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module.c

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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

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pid.c

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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

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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_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

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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