[uml-devel] noexec /tmp & uml

[uml-devel] noexec /tmp & uml

[Cristian CONSTANTIN]

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hi!

don't know if anyone else saw it / knew it before, but I found it out
the hard way...
so, my /tmp is mounted with noexec option. when I start uml (2.4.23) it
stops booting, barking like:

Kernel panic: map_memory(0xa2800000, 3, 0x8dc000, 4096, 1, 1, 1) failed,
err = -1

strace on the uml executable image (linux) reveals:

mmap2(0xa2800000, 4096, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_FIXED, 3,
 0x8dc) = -1 EPERM (Operation not permitted)

it seems fd 3 points to a file somewhere in /tmp.
mounting /tmp with exec option solves the problem.

bye now!
cristian
-- 
 _          | There are many people who use UNIX or Linux  
(_'_        | who IMHO do not understand UNIX.
  (_'rist   |              --David Korn  
GPG public key at wwwkeys.de.pgp.net

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Re: [uml-devel] noexec /tmp & uml

[Jeff Dike]

On Fri, Mar 12, 2004 at 11:54:37PM +0100, Cristian CONSTANTIN wrote:
> don't know if anyone else saw it / knew it before, but I found it out
> the hard way...
> so, my /tmp is mounted with noexec option. when I start uml (2.4.23) it
> stops booting, barking like:
> 
> Kernel panic: map_memory(0xa2800000, 3, 0x8dc000, 4096, 1, 1, 1) failed,
> err = -1

Good find.  I'll stick in a check for that and put out a better error
message.

				Jeff


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