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patches/glibc/ports-2.10.1/340-dl_execstack-PaX-support.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Mon Aug 23 14:32:16 2010 +0200 (2010-08-23)
changeset 2100 f9fcfc002c8a
permissions -rw-r--r--
debug/gdb: install dependable libs in a generic target static libs dir

For now, ncurses is the only dependable target library built for gdb.
But expat is coming, and there's no reason to install each library in
its own place.

So, install ncurses in a generic directory, where other dependable
libraries can be installed as well.

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-2.10.1.orig/nptl/allocatestack.c glibc-2.10.1/nptl/allocatestack.c

    12 --- glibc-2.10.1.orig/nptl/allocatestack.c	2009-01-29 21:34:16.000000000 +0100

    13 +++ glibc-2.10.1/nptl/allocatestack.c	2009-11-13 00:50:33.000000000 +0100

    14 @@ -326,7 +326,8 @@

    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-2.10.1.orig/sysdeps/unix/sysv/linux/dl-execstack.c glibc-2.10.1/sysdeps/unix/sysv/linux/dl-execstack.c

    25 --- glibc-2.10.1.orig/sysdeps/unix/sysv/linux/dl-execstack.c	2006-01-08 09:21:15.000000000 +0100

    26 +++ glibc-2.10.1/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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