---------- Forwarded message ----------
From: Manoj Awasthi <lkml.manoj@xxxxxxxxx>
Date: २००६ अगस्त ११ २३:५९
Subject: Re: learning proc read write
To: Keppler Alecrim <alecrim@xxxxxxxxx>
Hi Keppler,
problem seems like some memory corruption ! see some comments inline. since I too am new to kernel and this group so CMIIW.
I was writing a new comand line when the error happened
[42949478.160000] Kernel panic - not syncing: Kernel mode fault at addr 0x61202d68, ip 0x400ab0b8
[42949478.160000 ] [42949478.160000]
addr 0x61202d68 does not seem like a kernel address. right ? ( < 3GB)
+ out=kmalloc(200,GFP_KERNEL);
are you sure about 200 bytes of memory ? is it all that you need ? I don't think so.
+ item=kmalloc(20,GFP_KERNEL);
+ strcpy(out,"");
+ for_each_process(p)//pointer p will run for all process
+ {
+ if(c->uid == p->uid)//some uid = user identifier
+ {
+ sprintf(item,"< %d , %s >\n",p->pid,p->comm);//store on task identifier and name on item
+ strcat(out,item); //acumulate item to out
here you will die ! since you did not check for memory so an overflow will take place.
+ }
Thanks
--
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Francisco Keppler Silva Alecrim
Instituto Nokia de Tecnologia (INdT) - OSMRC
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Francisco Keppler Silva Alecrim
Instituto Nokia de Tecnologia (INdT) - OSMRC
