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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>
Sun Jan 17 23:06:02 2010 +0100 (2010-01-17)
changeset 1740 c57458bb354d
permissions -rw-r--r--
configure: do not require hg when configuring in an hg clone

When configuring in an hg clone, we need hg to compute the version string.
It can happen that users do not have Mercurial (eg. if they got a snapshot
rather that they did a full clone). In this case, we can still run, of
course, so simply fill the version string with a sufficiently explicit
value, that does not require hg. The date is a good candidate. 
     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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