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Revision a98fdcef941e107eeabae622d85a1f476f25a160 authored by Oleg Nesterov on 14 January 2008, 21:02:37 UTC, committed by Linus Torvalds on 14 January 2008, 21:23:00 UTC 
fix the "remove task_ppid_nr_ns" commit
 
Commit 84427eaef1fb91704c7112bdb598c810003b99f3 (remove task_ppid_nr_ns)
moved the task_tgid_nr_ns(task->real_parent) outside of lock_task_sighand().
This is wrong, ->real_parent could be freed/reused.

Both ->parent/real_parent point to nothing after __exit_signal() because
we remove the child from ->children list, and thus the child can't be
reparented when its parent exits.

rcu_read_lock() protects ->parent/real_parent, but _only_ if we know it was
valid before we take rcu lock.

Revert this part of the patch.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 4fd3670
Raw File
avr32_ksyms.c 
/*
 * Export AVR32-specific functions for loadable modules.
 *
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>

#include <asm/checksum.h>
#include <asm/uaccess.h>

/*
 * GCC functions
 */
extern unsigned long long __avr32_lsl64(unsigned long long u, unsigned long b);
extern unsigned long long __avr32_lsr64(unsigned long long u, unsigned long b);
extern unsigned long long __avr32_asr64(unsigned long long u, unsigned long b);
EXPORT_SYMBOL(__avr32_lsl64);
EXPORT_SYMBOL(__avr32_lsr64);
EXPORT_SYMBOL(__avr32_asr64);

/*
 * String functions
 */
EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(clear_page);

/*
 * Userspace access stuff.
 */
EXPORT_SYMBOL(copy_from_user);
EXPORT_SYMBOL(copy_to_user);
EXPORT_SYMBOL(__copy_user);
EXPORT_SYMBOL(strncpy_from_user);
EXPORT_SYMBOL(__strncpy_from_user);
EXPORT_SYMBOL(clear_user);
EXPORT_SYMBOL(__clear_user);
EXPORT_SYMBOL(csum_partial);
EXPORT_SYMBOL(csum_partial_copy_generic);

/* Delay loops (lib/delay.S) */
EXPORT_SYMBOL(__ndelay);
EXPORT_SYMBOL(__udelay);
EXPORT_SYMBOL(__const_udelay);

/* Bit operations (lib/findbit.S) */
EXPORT_SYMBOL(find_first_zero_bit);
EXPORT_SYMBOL(find_next_zero_bit);
EXPORT_SYMBOL(find_first_bit);
EXPORT_SYMBOL(find_next_bit);
EXPORT_SYMBOL(generic_find_next_zero_le_bit);

/* I/O primitives (lib/io-*.S) */
EXPORT_SYMBOL(__raw_readsb);
EXPORT_SYMBOL(__raw_readsw);
EXPORT_SYMBOL(__raw_readsl);
EXPORT_SYMBOL(__raw_writesb);
EXPORT_SYMBOL(__raw_writesw);
EXPORT_SYMBOL(__raw_writesl);
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