strace-4.10 cannot decode string

[Justin Huang]

Hi Dmitry,

I patched the changes in util.c and re-compiled strace. The results are the same as before and still cannot show filenames. 

Thanks,
Justin

-----Original Message-----
From: Dmitry V. Levin [mailto:ldv at altlinux.org] 
Sent: 2015年3月31日 8:00
To: Justin Huang
Cc: strace-devel at lists.sourceforge.net
Subject: Re: strace-4.10 cannot decode string

* PGP Signed by an unknown key

Hi,

On Thu, Mar 12, 2015 at 02:00:05PM +0000, Justin Huang wrote:
> Hi strace-developers,
> 
> I ran the sample hello.c code on strace 4.5.8 and 4.10.  Version 4.5.8 can show the text print "hello world" with write() in log while 4.10 only show some number which may be the address.

Looks like a hardened kernel where process_vm_readv fails with EPERM.
To confirm this hypothesis, try the patch from http://sourceforge.net/p/strace/mailman/message/33674829/


--
ldv

* Unknown Key
* 0x9E35361E

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