Re: [Tinycc-devel] current mod makes a core dump on Fedora18 x86_64

[Christian Jullien]

Hi all,

At least on Fedora 18, we have to compile with "-z execstack" which solves the 
reported issue.
Beware that execstack introduces a security holes
I'm not sure if -fno-stack-protector is also required
Now, the difficult part is to tell configure which gcc version start to support 
this option and which OS now requires to have -z execstack
Perhaps, some users may want to have tcc to compile programs only the standard 
way (i.e. .o + binary) keeping secure behavior without -z exectack and some 
other want to be able to use -run which this time requires execstak.

We have to consider to pass an option to ./configure to allow both, something 
--with-run

M2c

C.

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Christian Jullien
Sent: mardi 5 février 2013 20:17
To: 'grischka'; address@hidden
Subject: Re: [Tinycc-devel] current mod makes a core dump on Fedora18 x86_64

I've no time tonight but tomorrow I'll try to play with

-z execstack and/or -fno-stack-protection


-----Original Message-----
From: grischka [mailto:address@hidden 
Sent: mardi 5 février 2013 11:09
To: address@hidden
Cc: Christian JULLIEN
Subject: Re: [Tinycc-devel] current mod makes a core dump on Fedora18 x86_64

Christian Jullien wrote:
> Just checked this morning on F18 x86_64
> 
> [SNIP]
> make[1]: Entering directory `/home/jullien/tinycc/tests2'
> Test: 00_assignment...
> /bin/sh: line 5: 19084 Segmentation fault      (core dumped) ../tcc -B..
> -run 00_assignment.c 2>&1 > 00_assignment.output
> make[1]: *** [00_assignment.test] Error 139
> make[1]: Leaving directory `/home/jullien/tinycc/tests2'
> make: *** [test] Error 2

Problem with the tests2 is that we don't see the actual error message.

You could look in "00_assignment.output" or remove the 2>&1 redirection
(2 times) in tests2/Makefile and try again.

--- grischka


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