[POWERPC] Harden validate_sp against stack corruption

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If something has overflowed or corrupted the stack and causes an oops,
and we try to print a stack trace, that will call validate_sp, which
can itself cause an oops if the cpu field of the thread_info struct at
the bottom of the stack has been corrupted (if CONFIG_IRQSTACKS is
set).  This makes debugging harder.

To avoid the second oops, this adds a check to make sure that the cpu
number is reasonable before using it to check whether the stack is on
the softirq or hardirq stack.

Signed-off-by: Paul Mackerras <paulus@samba.org>

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This commit is contained in:

Paul Mackerras 2007-02-19 11:42:42 +11:00

parent 99ddef9bfe

commit bb72c481e9

1 changed files with 30 additions and 13 deletions

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arch/powerpc/kernel/process.c

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