Re: [uml-devel] 2.6.11 + uml.sf.net patches panic

[Bodo Stroesser <bstroesser@fujitsu-siemens.com>]

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Bodo Stroesser wrote:
> Jeff Dike wrote:
> 
>> The write_ldt just above the segfault in both stacks looks suspicious.
> 
> 
> Yes. There seems to be a problem with this new stuff.
> 
> Peter, could you please send a full call trace? I guess, the ones in your
> mail are truncated, right?
> 
>           Bodo
Meanwhile I found a problem in arch/um/sys-i386/ldt.c, which causes UML
to panic, if LDT-entry number 8 is written, using modify_ldt-syscall.

This crash is very similar to the one Peter had, so I hope the appended
oneliner will solve the problem.

        Bodo

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---


diff -puN arch/um/sys-i386/ldt.c~fix-skas-ldt arch/um/sys-i386/ldt.c
--- linux-2.6.11-rc3-mm2/arch/um/sys-i386/ldt.c~fix-skas-ldt	2005-03-04 15:51:04.000000000 +0100
+++ linux-2.6.11-rc3-mm2-root/arch/um/sys-i386/ldt.c	2005-03-04 15:51:27.000000000 +0100
@@ -208,7 +208,7 @@ static int write_ldt(void __user * ptr, 
 		goto out_unlock;
 
 	if(ldt_info.entry_number >= ldt->entry_count &&
-	   ldt_info.entry_number > LDT_DIRECT_ENTRIES){
+	   ldt_info.entry_number >= LDT_DIRECT_ENTRIES){
 		for(i=ldt->entry_count/LDT_ENTRIES_PER_PAGE;
 		    i*LDT_ENTRIES_PER_PAGE <= ldt_info.entry_number;
 		    i++){
_