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patches/glibc/ports-2.12.1/340-dl_execstack-PaX-support.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Jul 17 22:43:07 2011 +0200 (2011-07-17)
changeset 2893 a8a65758664f
permissions -rw-r--r--
cc/gcc: do not use the core pass-2 to build the baremetal compiler

In case we build a baremetal compiler, use the standard passes:
- core_cc is used to build the C library;
- as such, it is meant to run on build, not host;
- the final compiler is meant to run on host;

As the current final compiler step can not build a baremetal compiler,
call the core backend from the final step.

NB: Currently, newlib is built during the start_files pass, so we have
to have a core compiler by then... Once we can build the baremetal
compiler from the final cc step, then we can move the newlib build to
the proper step, and then get rid of the core pass-1 static compiler...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 	With latest versions of glibc, a lot of apps failed on a PaX enabled

     2 	system with:

     3 		 cannot enable executable stack as shared object requires: Permission denied

     4 	

     5 	This is due to PaX 'exec-protecting' the stack, and ld.so then trying

     6 	to make the stack executable due to some libraries not containing the

     7 	PT_GNU_STACK section.  Bug #32960.  <azarah@gentoo.org> (12 Nov 2003).

     8 

     9 	Patch also NPTL. Bug #116086. <kevquinn@gentoo.org> (20 Dec 2005).

    10 

    11 diff -durN glibc-2.12.1.orig/nptl/allocatestack.c glibc-2.12.1/nptl/allocatestack.c

    12 --- glibc-2.12.1.orig/nptl/allocatestack.c	2009-01-29 21:34:16.000000000 +0100

    13 +++ glibc-2.12.1/nptl/allocatestack.c	2009-11-13 00:50:33.000000000 +0100

    14 @@ -329,7 +329,8 @@

    15  # error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"

    16  #endif

    17    if (mprotect (stack, len, PROT_READ | PROT_WRITE | PROT_EXEC) != 0)

    18 -    return errno;

    19 +    if (errno != EACCES) /* PAX is enabled */

    20 +    	return errno;

    21  

    22    return 0;

    23  }

    24 diff -durN glibc-2.12.1.orig/sysdeps/unix/sysv/linux/dl-execstack.c glibc-2.12.1/sysdeps/unix/sysv/linux/dl-execstack.c

    25 --- glibc-2.12.1.orig/sysdeps/unix/sysv/linux/dl-execstack.c	2006-01-08 09:21:15.000000000 +0100

    26 +++ glibc-2.12.1/sysdeps/unix/sysv/linux/dl-execstack.c	2009-11-13 00:50:33.000000000 +0100

    27 @@ -63,7 +63,10 @@

    28        else

    29  # endif

    30  	{

    31 -	  result = errno;

    32 +	  if (errno == EACCES)  /* PAX is enabled */

    33 +	    result = 0;

    34 +	  else

    35 +	    result = errno;

    36  	  goto out;

    37  	}

    38      }

    39 @@ -89,7 +92,12 @@

    40  	page -= size;

    41        else

    42  	{

    43 -	  if (errno != ENOMEM)	/* Unexpected failure mode.  */

    44 +	  if (errno == EACCES)		/* PAX is enabled */

    45 +	    {

    46 +	      result = 0;

    47 +	      goto out;

    48 +	    }

    49 +	  else if (errno != ENOMEM)	/* Unexpected failure mode.  */

    50  	    {

    51  	      result = errno;

    52  	      goto out;

    53 @@ -115,7 +123,12 @@

    54  	page += size;

    55        else

    56  	{

    57 -	  if (errno != ENOMEM)	/* Unexpected failure mode.  */

    58 +	  if (errno == EACCES)		/* PAX is enabled */

    59 +	    {

    60 +	      result = 0;

    61 +	      goto out;

    62 +	    }

    63 +	  else if (errno != ENOMEM)	/* Unexpected failure mode.  */

    64  	    {

    65  	      result = errno;

    66  	      goto out;
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