[PATCH] vsprintf: Do not break early boot with probing addresses

[christophe leroy]

Le 10/05/2019 à 18:24, Steven Rostedt a écrit :
> On Fri, 10 May 2019 10:42:13 +0200
> Petr Mladek <pmladek at suse.com> wrote:
> 
>>   static const char *check_pointer_msg(const void *ptr)
>>   {
>> -	char byte;
>> -
>>   	if (!ptr)
>>   		return "(null)";
>>   
>> -	if (probe_kernel_address(ptr, byte))
>> +	if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
>>   		return "(efault)";
>>   
> 
> 
> 	< PAGE_SIZE ?
> 
> do you mean: < TASK_SIZE ?

I guess not.

Usually, < PAGE_SIZE means NULL pointer dereference (via the member of a 
struct)

Christophe

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